Fast Switching Thyristor 125 amp, TFI261-125 (800 – 1400V), Stud Type
|Average forward current, ITAV||125A|
|Voltage code, VRRM / 100||8 – 14|
Fast Switching Thyristor TFI261-125 AS ENERGITM in stud is a fast switching semiconductor device, designed for converting and control DC and AC currents up to 125A with frequency up to 10kHz in circuits with voltages up to 800V – 1400V (voltage class from 8 to 14). Thyristor package type – ST6, mounting standard thread M20x1.5, (on request, UNF thread 3/4"-16UNF-2A), weight – 240 g.
Fast switching (pulse) thyristors are devices with reduced tq, trr, Qrr values and with a higher value (diT/dt)cr (up to 2500 A/µs) designed to operate at higher frequencies modes (up to 10kHz). The thyristor parameters of VTM, tq, Qrr are interconnected, so a decrease in the value of tq and Qrr leads to an increase in VTM. Fast switching thyristors are characterized with a very low turn-off time that sets them apart from the standard models. They are used in welding, induction heating and melting, electric transportation, AC drives, UPS, and other systems requiring short turn-on and turn-off times. The thyristors have an industry-standard ceramic sealed housing isolating the functional part and the semiconductor element from mechanical impacts and environment.
Fast switching thyristors are supplied in stud design. The base of the thyristor is the Anode, the flexible power lead is the Cathode, the flexible wire exiting the base of the power lead is the auxiliary cathode, the flexible wire exiting the case is the control electrode (Gate). This thyristor can be an alternative product, replacement, analog, equivalent for other types fast switching thyristors 100A, 110A, 120A, 125 amp in a stud housing.
Air and water heat sinks are used to cool the thyristors. To provide reliable thermal and electrical contact with the heatsink a tightening torque Md must be observed during assembly. For better heat dissipation of thyristor during assembly, heat conducting paste is used.
Specifications and parameters, datasheets PDF, sample technical passport, dimensions, outline drawings, case diagrams thyristors, recommended coolers are listed below.
Our company provides a quality guarantee for power fast switching thyristors of 2 years from the date of purchase. When supplying thyristors, if necessary, we provide technical passport, certificate of conformity.
Fast stud thyristor ratings: TFI261-125-8 (125A 800V), TFI261-125-9 (125A 900V), TFI261-125-10 (125A 1000V), TFI261-125-12 (125A 1200V), TFI261-125-14 (125A 1400V).
The final price for stud fast switching thyristors depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.
General specifications of stud fast switching thyristors TFI261-125:
|Fast switching thyristor specifications||TFI261-125|
|Maximum allowable average forward current (Case temperature)||IT(AV) (Tcase)||125 A (88°C)
132 A (85°C)
198 A (55°C)
|Repetitive peak off-state voltage; Repetitive peak reverse voltage||VDRM/VRRM||800-1400 V|
|RMS on-state current||ITRMS||196 A|
|Surge on-state current||ITSM||4.5 kA|
|Safety factor||I2t||100 kA2·s|
|Peak on-state voltage, max||VTM||2.30 V|
|Peak on-state current||ITM||393 A|
|On-state threshold voltage, max||VT(TO)||1.335 V|
|On-state slope resistance, max||rT||2.083 mΩ|
|Turn-off time, max||tq||16-32 µs|
|Repetitive peak off-state and Repetitive peak reverse currents, max||IDRM/IRRM||50 mA|
|Critical rate of rise of off-state voltage, min||(dVD/dt)cr||200-2500 V/µs|
|Gate trigger direct voltage, max||VGT||2.5 V|
|Gate trigger direct current, max||IGT||250 mA|
|Critical rate of rise of on-state current||(diT/dt)cr||1000 A/µs|
|Temperature of p-n junction, max||Tvj max||125 ºC|
|Thermal resistance, junction to case, max||Rth(j-c)||0.15 ºC/W|
|Mounting torque||Md||20-30 N·m|
|Weight, approx.||W||240 g|
|Package type, Thread||Outline||ST6 (T.SA1)
|Recommended heatsinks||Heatsinks||O171, O271, O371, O471, OM101|
Part Numbering Guide for Fast Switching Thyristors TFI261-125:
|TFI||–||Fast Switching Thyristor (Fast Impulse Thyristor), AS ENERGITM|
|261||–||Thyristor type (stud type).|
|125||–||Average current in open state IT(AV), Amp.|
|14||–||Voltage class VRRM / 100 (Nominal voltage – 1400 V).|
|9||–||Parameter of the critical rate of rise of off-state voltage (dVD/dt)cr:
|7||–||Parameter of turn-off time tq:
|3||–||Parameter of turn-on time tgt:
Fast thyristor TFI261-125 datasheet:
High Power Semiconductors AS ENERGITM
Our company is engaged in the manufacturer and sale of wide range of power semiconductors (power thyristors, modules, rectifier diodes, rotor and welding diodes, triacs etc.) currents up to 15000A and voltages to 9000V, and air and water heatsinks to them. You can buy semiconductors in any volumes, and when ordering large lots, the price will be lower.
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For questions regarding the acquisition of Power Thyristors, Diodes, Modules send an email request to:
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For a large number, we will provide an individual price!!!
We are open to manufacture products at our production facilities
according to your requests and technical task.
Heat sinks for power stud fast switching thyristors:
Heat sinks (radiators) are used for cooling of power semiconductor devices in stud design.
Heat sinks of coolers are made of aluminum radiator profiles and do not require additional protective coating when used in various climatic conditions.