Fast Switching Thyristors – Features, Series Overview, Specifications, Datasheets

What is Fast Switching Power Thyristor?

Fast Switching Thyristors, also known as fast turn-off, fast turn-on thyristors or fast impulse thyristor are semiconductors with reduced t_q, t_rr, Q_rr.

Fast Switching Thyristors, in contrast to Fast Thyristors, are additionally normalized reverse recovery charge Q_rr.

Fast Switching Thyristors meet requirements, such as increased di/dt resistance (up to 2500 A/µs), low switching losses, very low turn-on and turn-off time. These devices are adapted for switching current pulses with a high rate of rise at the front and high amplitude.

Optimal frequency range for using fast switching thyristors is up to 10kHz.
The optimal frequency range for using ultra fast thyristors such as thyristors KA series is up to 20kHz.

The characteristics U_TM, t_q, Q_rr of the fast switching thyristor are related: a decrease in the value of t_q and Q_rr leads to an increase in U_TM.

To optimize the combination of U_TM, t_q, Q_rr, technological methods are applied that allow a controlled reduction of τ in the layers of the semiconductor chip: doping with atoms of heavy metals, irradiation with high-energy particles (γ-quanta, electrons, protons, alpha particles, etc.). Methods to control the p-emitter injection coefficient are also used.

To reduce t_q, a more efficient distributed cathode emitter shunt is also used (with smaller shunt spacings than for phase-control thyristors).

Since operation at higher frequencies is often accompanied by an increased speed at the front of the anode current pulses, fast thyristors have an increased di/dt-resistance and short turn-on time.

All disk-type thyristors presented on this site have a standard press-pack type ceramic housing. They are pressed with a relatively high force into heat-sinks which also serve as electrical contacts to the thyristor terminals.

Fast switching thyristors are available with forward current rating I_TAV ranges from 200A to 3200A, and the range of reverse blocking voltage V_RRM is from 400V to 4000V, and with t_q from 8.0 µs.

Power Fast Switching Thyristors are popular used in welding, induction heating and melting, electric transportation, high-power rectifiers, AC drives, power supplies, and other systems requiring short turn-on and turn-off times.

See also articles: Phase Control Thyristors (PCT), Fast Thyristors, Thyristor Modules – Series Overview.

Series of Fast Switching Thyristors in disc case design

Fast Thyristors Switching TFI series AS ENERGI^TM

Fast Switching Thyristors TFI series AS ENERGI^TM, also known as "Fast Impulse Thyristor" (TFI) are press pack type thyristors, regulating and converting DC and AC currents from 250A to 3200A at frequencies up to 10 kHz in circuits with voltage ratings from 400V up to 4000V, and with t_q from 10 µs.

Fast switching thyristors meet requirements, such as increased di/dt resistance, low switching losses, short turn-on and turn-off time.

Fast thyristors are devices with reduced t_q, t_rr, Q_rr, ERQ values designed to operate at higher frequencies modes.

Fast switching thyristors are thyristors with additionally normalized reverse recovery charge Q_rr. These devices are adapted for switching current pulses with a high rate of rise at the front and high amplitude.

TFI323	TF133...TF933	TF143...TF643	TF153...TF453
TF163, TF263	TF173...TF873	TFI183	TFI193

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Fast Switching Thyristors TFI323, TFI133...TFI933 (250A – 400A)

Type	IT(AV) (Tcase)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Package	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	g		mm	PDF
250 A
TFI323-250	250 (85)	600-1200	3.0	180	1000	800	20-25	125	0.070	6	70	PT21 (T.A1)	42x19x14
TFI833-250	250 (94)	3000	5.7	162	1000	1000	50-125	125	0.040	10	180	PT32 (T.B3)	54x32x20
TFI933-250	250 (92)	3000	5.4	140	200-1000	1600	63	125	0.040	10	180	PT32 (T.B3)	54x32x20
320 A
TFI233-320	320 (85)	2000-2400	6.3	190	200-1000	1600	25-50	125	0.050	10	180	PT32 (T.B3)	54x32x20
TFI333-320	320 (85)	1200-2400	6.3	190	200-1000	1600	25-50	125	0.050	10	180 110	PT32 T.B2	54x32x20 42x25x14
400 A
TFI133-400	400 (89)	1000-1200	7.0	240	200-2500	1600	10-20	125	0.040	10	110	PT31 T.B2	47x27x15 42x25x14
TFI233-400	400 (80)	2000-2400	6.6	210	200-2500	1600	50-63	125	0.050	10	180	PT32 (T.B3)	54x32x20
TFI333-400	400 (88)	600-1500	6.0	180	200-2500	1600	16-32	125	0.040	10	180 110	PT32 T.B2	54x32x20 42x25x14
TFI433-400	400 (89)	300-1200	7.0	240	200-2500	1600	10-20	125	0.040	10	180 110	T.B3 PT31	54x32x20 47x27x15
TFI533-400	400 (88)	1000-1500	6.0	180	200-2500	1600	16-32	125	0.040	10	180	PT32 (T.B3)	54x32x20

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Fast Switching Thyristors TFI143...TFI643 (400A – 630A)

Type	IT(AV) (Tcase)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Package	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	g		mm	PDF
400 A
TFI143-400	400 (90)	1000-1500	8	320	200-1000	2000	10	125	0.032	15	280	PT43	60x35x26
TFI243-400	400 (88)	2000-2200	8	320	200-1000	2000	25	125	0.034	15	280	PT43	60x35x26
TFI343-400	400 (94)	1000-1500	9.5	450	200-2500	2000	10-20	125	0.030	15	180	T.C1	60x38x14
TFI443-400	400 (91)	2000-2200	9.0	400	200-2500	2000	25-50	125	0.030	15	180	T.C1	60x38x14
TFI543-400	400 (92)	1000-1500	9.5	450	200-2500	2000	10-20	125	0.032	15	240	PT42 (T.C2)	60x38x20
TFI643-400	400 (89)	2000-2200	9.0	400	200-2500	2000	25-50	125	0.034	15	240	T.C2	60x38x20
500 A
TFI143-500	500 (85)	1000-1500	9	405	200-1000	2000	12.5	125	0.032	15	280	PT43	60x35x26
TFI243-500	500 (85)	2000-2200	9	400	200-1000	2000	32	125	0.034	15	280	PT43	60x35x26
TFI343-500	500 (91)	1000-1500	11.0	600	200-2500	2000	12.5-25	125	0.030	15	240 180	PT42 T.C1	60x38x20 60x38x14
TFI443-500	500 (89)	2000-2200	10.0	500	200-2500	2000	32-63	125	0.030	15	180	T.C1	60x38x14
TFI543-500	500 (89)	1000-1500	11.0	600	200-2500	2000	12.5-25	125	0.032	15	240	T.C2	60x38x20
TFI643-500	500 (84)	2000-2200	10.0	500	200-2500	2000	32-63	125	0.034	15	240	T.C2	60x38x20
630 A
TFI143-630	630 (80)	1000-1500	10	500	200-1000	2000	16	125	0.032	15	280	PT43	60x35x26
TFI243-630	630 (80)	2000-2200	10	500	200-1000	2000	32	125	0.034	15	280	PT43	60x35x26
TFI343-630	630 (84)	1000-1500	11.5	660	200-2500	2000	16-32	125	0.030	15	240 180	PT42 T.C1	60x38x20 60x38x14
TFI443-630	630 (85)	2000-2200	10.5	550	200-2500	2000	32-63	125	0.030	15	180	PT41 T.C1	60x38x14
TFI543-630	630 (81)	1000-1500	11.5	660	200-2500	1600	16-32	125	0.032	15	240	T.C2	60x38x20
TFI643-630	630 (75)	2000-2200	10.5	550	200-2500	2000	32-63	125	0.034	15	240	T.C2	60x38x20

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Fast Switching Thyristors TFI153...TFI453 (700A – 1250A)

Type	IT(AV) (Tcase)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Package	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	g		mm	PDF
700 A
TFI353-700	700 (87)	3000	14	980	200-1000	2000	40-63	120	0.020	26	550	PT53 (T.D2)	75x51x26
800 A
TFI153-800	800 (85)	1000-1500	19	1800	200-1000	2000	10	125	0.021	26	550	PT53	75x51x26
TFI253-800	800 (85)	1800-2200	17	1400	200-1000	2000	20	125	0.021	26	550	PT53	75x51x26
TFI353-800	800 (80)	3000-3400	20	2000	200-2500	2000	63	125	0.0210	26	550	PT53 (T.D2)	75x51x26
1000 A
TFI153-1000	1000 (80)	1000-1500	20	2000	200-1000	2000	12.5	125	0.021	26	550	PT53	75x51x26
TFI253-1000	1000 (75)	1800-2200	18	1600	200-1000	2000	20	125	0.021	26	550	PT53	75x51x26
TFI353-1000	1000 (79)	2000-2800	21	2200	200-2500	2200	50-63	125	0.020	26	550	PT53 (T.D2)	75x51x26
TFI453-1000	1150 (85)	300-900	18	3600	1000	1000	12.5-20	125	0.0160	24	330	PT51	75x51x14
1250 A
TFI153-1250	1250 (70)	1000-1500	21	2200	200-1000	2000	16	125	0.021	26	550	PT53	75x51x26
TFI253-1250	1250 (71)	1800-2200	19.5	1900	200-1000	2000	50	125	0.021	26	550	PT53	75x51x26
TFI353-1250	1250 (80)	600-1500	21	2400	1000	1000	20	125	0.020	26	550	PT53-1	75x51x26
TFI453-1250	1250 (75)	1000-1500	29	4200	200-2500	2000	16-32	125	0.0210	26	330	PT51 (T.D1)	75x51x14

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Fast Switching Thyristors TFI163, TFI263 (1250A, 1600A)

Type	IT(AV) (Tcase)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Package	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	g		mm	PDF
1250 A
TFI163-1250	1258 (85)	2000-2400	24	5600	1000	1000	50	125	0.015	33	700	PT63	87x60x26
1600 A
TFI163-1600	1520 (80)	900-1400	35	6300	1000	1000	25	125	0.015	33	700	PT63	87x60x26
TFI263-1600	1423 (80)	1500-2000	35	6000	1000	1000	40	125	0.015	33	700	PT63	87x60x26

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Fast Switching Thyristors TFI173...TFI873 (1600A, 2000A)

Type	IT(AV) (Tcase)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Package	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	g		mm	PDF
1600 A
TFI173-1600	1890 (85)	1500-2000	36	8000	1000	1000	40	125	0.011	45	1200	PT73	112x75x26
TFI273-1600	1704 (85)	2000-2400	32	8000	1000	1000	50	125	0.011	45	1200	PT73	112x75x26
TFI373-1600	1600 (91)	2000-2800	40	8000	200-2500	2500	50-63	125	0.010	45	1700	PT74 (T.F5)	112x75x35
TFI473-1600	1569 (85)	3800-4000	34	5700	200-2500	2000	125	125	0.010	45	1700	PT74 (T.F5)	112x75x35
TFI773-1600	1600 (96)	2000-2800	40	8000	200-2500	2500	50-63	125	0.0085	45	1210	PT73 (T.F1)	112x75x26
TFI873-1600	1600 (90)	3800-4000	34	5700	200-2500	2000	125	125	0.0085	45	1210	PT73 (T.F1)	112x75x26
2000 A
TFI173-2000	2000 (89)	900-1400	48.5	11700	200-1000	2500	10	125	0.010	45	1200 1700	PT73 PT74	112x75x26 112x75x35
TFI273-2000	2000 (85)	2000	40	8000	200-1000	2500	32	125	0.010	45	1700	PT74	112x75x35
TFI373-2000	2000 (84)	2000-2500	37.2	6900	200-1000	2500	40-63	125	0.010	45	1700	PT74 (T.F5)	112x75x35
TFI573-2000	2000 (92)	1000-1200	65	21100	200-2500	2500	10-20	125	0.0085	45	1210	PT73 (T.F1)	112x75x26
TFI673-2000	2000 (91)	2000	40	8000	200-2500	2500	32-63	125	0.0085	45	1210	PT73 (T.F1)	112x75x26
TFI773-2000	2000 (90)	2000-2500	40	8000	200-1000	2500	40-63	125	0.0085	45	1210	PT73 (T.F1)	112x75x26

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Fast Switching Thyristors TFI183 (2500A, 3200A)

Type	IT(AV) (Tcase)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Package	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	g		mm	PDF
2500 A
TFI183-2500	2500 (80)	2000-2400	40	12000	1000	1000	40-63	125	0.008	70	1800	PT83	120x86x26
3200 A
TFI183-3200	3214 (70)	1000-1600	45	13500	1000	1000	25-63	125	0.008	70	1800	PT83	120x86x26

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Fast Switching Thyristors TFI193 (2500A)

Type	IT(AV) (Tcase)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Package	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	g		mm	PDF
2500 A
TFI193-2500	2466 (85)	2600-3000	50	11000	1000	1000	63	125	0.0065	85	2200	PT93	147x100x34

Fast Switching Thyristors KG series AS ENERGI^TM

Fast Switching Thyristors KG series AS ENERGI^TM in disc design are press pack type fast turn-off high frequency semiconductor devices. High frequency thyristors meet requirements, such as increased di/dt resistance, low switching losses, short turn-on and turn-off time.

Fast High Frequency Thyristor KG series regulating and converting DC and AC currents from 200A to 1200A at frequency range is up to 10 kHz in circuits with voltages from 800V to 2400V.

Type	IT(AV) (TC=70°C)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Outline	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	kg		mm	PDF
KG200
KG200-(8...18)	200	800-1800	2.4	168	500	200	10-16	125	0.08	5	0.10	A-1	42x25x15
KG200-(20...24)	200	2000-2400	2.4	168	500	200	10-16	125	0.08	5	0.10	A-1	42x25x15
KG300
KG300-(8...18)	300	800-1800	3.6	168	500	200	10-16	125	0.08	5	0.10	A-1	42x25x15
KG300-(20...24)	300	2000-2400	3.6	168	500	200	10-16	125	0.08	5	0.10	A-1	42x25x15
KG400
KG400-(8...18)	400	800-1800	4.8	432	700	200	8-10	125	0.045	15	0.26	A-2	58x34x26
KG400-(20...24)	400	2000-2400	4.8	432	700	200	8-10	125	0.045	15	0.26	A-2	58x34x26
KG500
KG500-(8...18)	500	800-1800	6.0	500	700	200	12-18	125	0.045	15	0.26	A-2	58x34x26
KG500-(20...24)	500	2000-2400	6.0	500	700	200	12-18	125	0.045	15	0.26	A-2	58x34x26
KG600
KG600-(8...18)	600	800-1800	7.2	720	700	250	12-18	125	0.041	18	0.30	A-3	66x42x26
KG600-(20...24)	600	2000-2400	7.2	720	700	250	12-18	125	0.041	18	0.30	A-3	66x42x26
KG800
KG800-(8...18)	800	800-1800	9.6	1328	1000	250	12-18	125	0.035	20	0.37	A-4	69x45x26
KG800-(20...24)	800	2000-2400	9.6	1328	1000	250	12-18	125	0.035	20	0.37	A-4	69x45x26
KG1000
KG1000-(8...18)	1000	800-1800	12.0	1620	1000	250	12-18	125	0.020	22	0.47	A-5	74x47x26
KG1000-(20...24)	1000	2000-2400	12.0	1620	1000	250	12-18	125	0.020	22	0.47	A-5	74x47x26
KG1200
KG1200-(8...18)	1200	800-1800	14.0	1445	1000	200	8-15	125	0.018	30	0.60	A-6	85x55x26
KG1200-(20...24)	1200	2000-2400	14.0	1445	1000	200	8-15	125	0.018	30	0.60	A-6	85x55x26

Ultra Fast Switching Thyristors KA series AS ENERGI^TM

Ultra Fast High Frequency Thyristor KA series AS ENERGI^TM in disc design are press pack type ultra fast turn-off high frequency semiconductor devices. High frequency thyristors meet requirements, such as increased di/dt resistance, low switching losses, short turn-on and turn-off time.

Ultra Fast High Frequency Thyristor KA series regulating and converting DC and AC currents from 300A to 2500A at frequency range is up to 20 kHz in circuits with voltages from 800V to 2400V.

Type	IT(AV) (TC=70°C)	VDRM VRRM	ITSM	I2t	dv/dt	di/dt	tq	Tvj max	Rth(j-c)	Fm ±10%	W	Outline	Dimensions ØDxØdxH	Data-sheet
	A	V	kA	kA2·s	V/µs	A/µs	µs	ºC	ºC/W	kN	kg		mm	PDF
KA300
KA300-(8...14)	300	800-1400	5.8	168	200	1500	12-24	125	0.08	5	0.10	A-1	42x25x15
KA400
KA400-(8...14)	400	800-1400	5.68	168	200	1500	12-24	125	0.08	5	0.10	A-1	42x25x15
KA500
KA500-(8...12)	500	800-1200	5.4	146	200	1500	10-20	125	0.08	5	0.10	A-1	42x25x15
KA600
KA600-(8...14)	600	800-1400	9.3	432	200	1500	12-24	125	0.045	15	0.26	A-2	58x34x26
KA700
KA700-(8...12)	700	800-1200	8.9	396	200	1500	10-20	125	0.045	15	0.26	A-2	58x34x26
KA800
KA800-(6...9)	800	600-900	8.0	320	200	1500	5-7	125	0.045	15	0.26	A-2	58x34x26
KA900
KA900-(12...16)	900	1200-1600	10.0	500	200	1500	18-36	125	0.041	18	0.30	A-3	66x42x26
KA1000
KA1000-(8...14)	1000	800-1400	12.0	720	200	1500	15-28	125	0.035	20	0.37	A-4	69x45x26
KA1000-(12...16)	1000	1200-1600	11.0	605	200	1500	18-36	125	0.035	20	0.37	A-4	69x45x26
KA1100
KA1100-(8...18)	1100	800-1200	11.0	605	200	1500	10-20	125	0.035	20	0.37	A-4	69x45x26
KA1200
KA1200-(6...9)	1200	600-900	9.6	461	200	1500	6-15	125	0.035	20	0.37	A-4	69x45x26
KA1200-(8...14)	1200	800-1400	16.3	1328	200	1500	15-28	125	0.020	22	0.47	A-5	74x47x26
KA1400
KA1400-(8...12)	1400	800-1200	15.0	1125	200	1500	10-20	125	0.020	22	0.47	A-5	74x47x26
KA1500
KA1500-(8...14)	1500	800-1400	18.0	1620	200	1500	15-28	125	0.018	30	0.60	A-6	85x55x26
KA1700
KA1700-(8...12)	1700	800-1200	17.0	1445	200	1500	10-20	125	0.018	30	0.60	A-6	85x55x26
KA2000
KA2000-(10...12)	2000	1000-1200	23.0	2645	1000	1200	8-15	125	0.0125	45	1.0	A-8	100x63x26
KA2500
KA2500-(10...12)	2500	1000-1200	23.0	2645	1000	1200	8-15	125	0.01	56	1.44	A-9	110x73x26

Fast Switching Thyristors 5STF series ABB Power Grids (Hitachi Energy)

Fast Switching Thyristors 5STF series ABB Power Grids (Hitachi Energy) are available with forward on-state current I_TAV ratings from 500A to 2800A and reverse blocking voltages V_RRM from 1000V to 3000V, and with t_q from 8.0 µs.

Type	IT(AV)M (TC=70°C)	VDRM VRRM	ITSM	VT0	rT	tq	Tvj max	Rth(j-c)	Rth(c-h)	Fm ±10%	Package	Replacement AS ENERGITM	Data sheet
	A	V	kA	V	mΩ	µs	ºC	K/kW	K/kW	kN			PDF
5STF 05D
5STF 05D2425	517	2400	7.0	2.55	0.43	25, 32	125	32.0	10.0	10	D	ATF 500-24-D-25
5STF 05D2625		2600										ATF 500-26-D-25
5STF 05T
5STF 05T2425	517	2400	7.0	2.55	0.43	25, 32	125	32.0	10.0	10	T1	ATF 500-24-T-25
5STF 05T2625		2600										ATF 500-26-T-25
5STF 06D
5STF 06D1408	568	1400	11.0	2.31	0.36	8, 10	125	32.0	10.0	10	D	ATF 600-14-D-08
5STF 06D1620	557	1800	8.0	2.34	0.38	20, 25	125	32.0	10.0	10	D	ATF 600-16-D-20
5STF 06D2020		2000										ATF 600-20-D-20
5STF 06D2440	617	2400	8.0	2.04	0.36	40, 50	125	32.0	10.0	10	D	ATF 600-24-D-40
5STF 06D2640		2600										ATF 600-26-D-40
5STF 06T
5STF 06T1408	568	1400	11.0	2.31	0.36	8, 10	125	32.0	10.0	10	T1	ATF 600-14-T-08
5STF 06T1820	557	1800	8.0	2.34	0.38	20, 25	125	32.0	10.0	10	T1	ATF 600-18-T-20
5STF 06T2020		2000										ATF 600-20-T-20
5STF 06T2440	617	2400	8.0	2.04	0.36	40, 50	125	32.0	10.0	10	T1	ATF 600-24-T-40
5STF 06T2640		2600										ATF 600-26-T-40
5STF 07D
5STF 07D1213	710	1200	12.0	1.65	0.34	12.5, 14, 16	125	32.0	10.0	10	D	ATF 700-12-D-13
5STF 07D1413		1400										ATF 700-14-D-13
5STF 07D1414		1400										ATF 700-14-D-14
5STF 07D2032	679	2000	9.0	1.84	0.30	32, 40	125	32.0	10.0	10	D	ATF 700-20-D-32
5STF 07T
5STF 07T1213	710	1200	12.0	1.65	0.34	12.5, 14, 16	125	32.0	10.0	10	T1	ATF 700-12-T-13
5STF 07T1413		1400										ATF 700-14-T-13
5STF 07T1414		1400										ATF 700-14-T-14
5STF 07T1832	679	1800	9.0	1.84	0.30	32, 40	125	32.0	10.0	10	T1	ATF 700-18-T-32
5STF 07T2032		2000										ATF 700-20-T-32
5STF 08F
5STF 08F1660	800	1600	15.0	1.25	0.43	60	125	16.0	4.0	22	F	ATF 800-16-F-60
5STF 08F1860		1800										ATF 800-18-F-60
5STF 08F2060		2000										ATF 800-20-F-60
5STF 09F
5STF 09F1420	885	1400	16.0	1.10	0.36	20	125	16.0	4.0	22	F	ATF 900-14-F-20
5STF 09F1620		1600										ATF 900-16-F-20
5STF 09D
5STF 09D1220	847	1200	13.0	1.23	0.31	20, 25	125	32.0	10.0	10	D	ATF 900-12-D-20
5STF 09D1420		1400										ATF 900-14-D-20
5STF 09T
5STF 09T1225	847	1200	13.0	1.23	0.31	20, 25	125	32.0	10.0	10	T1	ATF 900-12-T-25
5STF 09T1420		1400										ATF 900-14-T-20
5STF 10F
5STF 10F2810	1003	2800	13.0	2.56	0.24	80, 100	125	16.0	4.0	22	F	ATF 1000-28-F-10
5STF 10F3080		3000										ATF 1000-30-F-80
5STF 11F
5STF 11F2810	1112	2800	14.0	2.14	0.25	100, 125	125	16.0	4.0	22	F	ATF 1100-28-F-10
5STF 11F3010		3000										ATF 1100-30-F-10
5STF 12F
5STF 12F1832	1202	1800	17.0	1.99	0.21	25, 32, 40, 50	125	16.0	4.0	22	F	ATF 1200-18-F-32
5STF 12F2025		2000										ATF 1200-20-F-25
5STF 12F2040		2000										ATF 1200-20-F-40
5STF 13F
5STF 13F1020	1252	1000	21.0	1.77	0.24	20, 25	125	16.0	4.0	22	F	ATF 1300-10-F-20
5STF 13F1220		1200										ATF 1300-12-F-20
5STF 14F
5STF 14F1863	1440	1800	17.0	1.60	0.17	63, 70	125	16.0	4.0	22	F	ATF 1400-18-F-63
5STF 14F2063		2000										ATF 1400-20-F-63
5STF 15F
5STF 15F1032	1532	1000	21.0	1.28	0.20	32, 40	125	16.0	4.0	22	F	ATF 1500-10-F-32
5STF 15F1232		1200										ATF 1500-12-F-32
5STF 15F1840	1489	1800	17.0	1.60	0.14	40, 50	125	16.0	4.0	22	F	ATF 1500-18-F-40
5STF 15F2040		2000										ATF 1500-20-F-40
5STF 16F
5STF 16F1213	1526	1200	21.0	1.62	0.12	12.5, 16	125	16.0	4.0	22	F	ATF 1600-12-F-13
5STF 16F1413		1400										ATF 1600-14-F-13
5STF 17F
5STF 17F1220	1693	1200	21.0	1.40	0.11	20, 25	125	16.0	4.0	22	F	ATF 1700-12-F-20
5STF 17F1420		1400										ATF 1700-14-F-20
5STF 18F
5STF 18F1010	1779	1000	22.0	1.37	0.09	10, 12.5	125	16.0	4.0	22	F	ATF 1800-10-F-10
5STF 18F1210		1200										ATF 1800-12-F-10
5STF 23H
5STF 23H2040	2322	2000	42.0	1.52	0.11	40, 60	125	10.0	3.0	50	H	ATF 2300-20-H-40
5STF 28H
5STF 28H2060	2667	2000	46.5	1.20	0.10	60, 80	125	10.0	3.0	50	H	ATF 2800-20-H-60

Fast Switching Thyristors Westcode (IXYS UK Westcode, Littelfuse Technology)

Fast Switching Thyristors Littelfuse Technology, formerly Westcode Semiconductors, ensure low switching losses and high di/dt performance.

Fast Switching Thyristors Westcode are available from 400V up to 1200V, current from 295A up to 1007A and turn-off time t_q from 10μs up to 30μs.

Type	VDRM VRRM	IT(AV)M (TC = 55°C)	ITSM	I2t	tq	VT0	rT	Tvj max	Rth(j-c)	Case	Dimensions ØDxØdxH	Replacement AS ENERGITM	Data sheet
	V	A	A	A2·s	µs	V	mΩ	ºC	K/W		mm		PDF
P0295WC12D	1200	295	2700	36.5x103	20	1.600	1.230	125	0.0950	W8	42x19x14	ATDP0295WC12D
P0295WC12E					25							ATDP0295WC12E
P0327WC08C	800	327	3250	63.9x103	15	1.550	0.870	125	0.0950	W8	42x19x14	ATDP0327WC08C
P0327WC08D					20							ATDP0327WC08D
P0327WC08E					25							ATDP0327WC08E
P0327WC08F					30							ATDP0327WC08F
P0327WC12C	1200	327	3250	63.9x103	15	1.550	0.870	125	0.0950	W8	42x19x14	ATDP0327WC12C
P0327WC12D					20							ATDP0327WC12D
P0327WC12E					25							ATDP0327WC12E
P0327WC12F					30							ATDP0327WC12F
P0366WC04A	400	366	4700	110x103	10	1.400	0.670	125	0.0950	W8	42x19x14	ATDP0366WC04A
P0366WC04B					12							ATDP0366WC04B
P0366WC04C					15							ATDP0366WC04C
P0366WC06A	600	366	4700	110x103	10	1.400	0.670	125	0.0950	W8	42x19x14	ATDP0366WC06A
P0366WC06B					12							ATDP0366WC06B
P0366WC06C					15							ATDP0366WC06C
P0366WC08A	800	366	4700	110x103	10	1.400	0.670	125	0.0950	W8	42x19x14	ATDP0366WC08A
P0366WC08B					12							ATDP0366WC08B
P0366WC08C					15							ATDP0366WC08C
P0367WC12E	1200	367	3600	64.8x103	25	1.170	0.920	125	0.0950	W8	42x19x14	ATDP0367WC12E
P0367WC12F					30							ATDP0367WC12F
P0389WC04B	400	389	5000	125x103	12	1.050	0.880	125	0.0950	W8	42x19x14	ATDP0389WC04B
P0389WC04C					15							ATDP0389WC04C
P0389WC08B	800	389	5000	125x103	12	1.050	0.880	125	0.0950	W8	42x19x14	ATDP0389WC08B
P0389WC08C					15							ATDP0389WC08C
P0515WC04B	400	515	6500	211x103	12	0.950	0.377	125	0.0950	W8	42x19x14	ATDP0515WC04B
P0515WC04C					15							ATDP0515WC04C
P0515WC04D					20							ATDP0515WC04D
P0515WC06B	600	515	6500	211x103	12	0.950	0.377	125	0.0950	W8	42x19x14	ATDP0515WC06B
P0515WC06C					15							ATDP0515WC06C
P0515WC06D					20							ATDP0515WC06D
P0838LC06B	600	1110	12300	750x103	12	1.200	0.280	125	0.0320	W10	58x34x27	ATDP0838LC06B
P0838LC06C					15							ATDP0838LC06C
P0838LC08B	800	1110	12300	750x103	12	1.200	0.280	125	0.0320	W10	58x34x27	ATDP0838LC08B
P0838LC08C					15							ATDP0838LC08C
P0848YC04B	400	848	8750	383x103	12	1.010	0.305	125	0.0500	W58	42x25x14	ATDP0848YC04B
P0848YC04C					15							ATDP0848YC04C
P0848YC06B	600	848	8750	383x103	12	1.010	0.305	125	0.0500	W58	42x25x14	ATDP0848YC06B
P0848YC06C					15							ATDP0848YC06C
P1007LC08D	800	1007	9500	451x103	20	1.509	0.265	125	0.0320	W10	58x34x27	ATDP1007LC08D
P1007LC08E					25							ATDP1007LC08E
P1007LC08F					30							ATDP1007LC08F
P1007LC12D	1200	1007	9500	451x103	20	1.509	0.265	125	0.0320	W10	58x34x27	ATDP1007LC12D
P1007LC12E					25							ATDP1007LC12E
P1007LC12F					30							ATDP1007LC12F

Air-cooled and Water-cooled heat-sinks for disc type thyristors

The operation of semiconductor devices at high currents and high reverse voltages is accompanied by high power in the p-n junction of the silicon chip.

Air and water heat sinks are used for cooling power SCR thyristors.

The heat sink is characterized by the value of power dissipation and the area of the cooling surface and is selected on the basis of the required heat dissipation at the operating power of the thyristor.

In disk-type thyristors, the necessary compression of the press contacts is provided only if they are assembled with heatsinks.

To keep electrical losses to a minimum and heat dissipation to a maximum, the necessary clamping force Fm must be provided during assembly.

Range of values of axial force on thyristor Fm, i.e. thyristor compression force, is from 10 to 100 kN depending on package diameter (housing type) and is specified in datasheet.

Heatsinks are used for disc (tablet type) semiconductors with сontact surface diameter from Ø19 mm to Ø100 mm.

See for more information about heatsinks for disc type SCR thyristors:
"Air-cooled heatsinks O series", "Air heatsink SF series", "Water heatsink SS series".

Installation recommendations for power disc type thyristors

The reliability of heat transfer and electrical contact between the mating surfaces of the thyristor and the cooler over the entire temperature range is ensured by appropriate torque (clamping force).

Before assembly you should perform visual inspection (1) contact surfaces for mechanical damages and wipe (2), soaked with alcohol (toluene, gasoline, acetone).

After inspection, fix the current contacts (leads), install a pin to fix the alignment of the structure.

To improve the parameters of heat transfer it is recommended to lubricate (3) a thin layer of silicone thermal conductive paste before the assembly, which is not a mandatory condition for installation.

Install the thyristor (3), the second part of the cooler, the fiberglass insulator and the thrust washer.

To thread the traverse (4) and evenly tighten the nuts. Make sure no misalignment and evenness of the contact surfaces.

When the parts are sufficiently clamped but moveable, we recommend placing the cooler on a flat surface and checking the tolerance for parallelism of the overall adjacent plane of the surfaces (5).

Clamp each nut in turn (about a quarter turn) to the stop (6). The amount of deflection of the traverse determines whether the achieved clamping force corresponds to the required one.

After installation, the fasteners (nuts and washers) must be additionally secured against corrosion.

Tips and recommendations for power thyristors:

The power thyristors should not be operated for long periods of time at their limit load for all parameters. In this case, the safety factor is determined by the required degree of reliability of the device.

Replace a failed power thyristor with a thyristor that matches the parameters of the one being replaced.

Supercooling must be provided when operating in an environment with an elevated ambient temperature.

Periodic cleaning of power thyristors and coolers to remove dust and contaminants is recommended to ensure proper heat dissipation.

Inductive current dividers (often twisted toroidal wire) should be used to equalize currents between power thyristors connected in parallel. The most popular connection methods are closed circuit, common coil circuit, or power thyristor. The efficiency of current dividers in this case is determined by the cross section of the magnetic wire.

Prevention of voltage unbalance when power thyristors are connected in series is achieved by using shunt resistors connected in parallel with each thyristor. Voltage equalization in transient conditions is provided by connecting capacitors in parallel to each thyristor.

It is strictly forbidden to touch power thyristors under high voltage during operation.