Phase Control Thyristors Semikron Replacement

Power phase control thyristors, also known as Thyristor SCR (Silicon Controlled Rectifier), stud and disc version are general-purpose thyristors, regulating and converting DC and AC currents up to 1200A in circuits with voltages to 1800V (depends on the thyristor type).

Thyristors ATS, ATD AS ENERGITM are a replacement, analog, alternative for discrete thyristors Semikron Danfoss.

"Air-cooled heatsinks O series for disc devices", "Air heatsink SF series", "Water heatsink SS series" for thyristor cooling are also available to order.

Part numbering guide for phase control thyristors

youtubeVideo: Reviews of high power disc thyristors

icon AS ENERGITM Semiconductors Manufacturing Reference

Semikron Danfoss’ discrete thyristors are available as stud screw-fit types for applications requiring robustness and easy assembly, along with capsule (disc) types for high power applications. The portfolio also includes phase control types with current ratings of up to 1200A, with blocking voltages of up to 1800V, covering all major applications.

Thyristors AS ENERGITM have the following features: low static and dynamic losses, high values of VDRM/VRRM, extensive experience of using the devices in various industries, range of voltages from 100 to 9000 V and amperages from 100 to 15000 A, high resistance to thermal and electric cycling, natural or forced air cooling.

Our company provides a quality guarantee for thyristors of 2 years from the date of purchase. When supplying thyristors, if necessary, we provide technical passport and certificate of conformity.

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The final price of phase control thyristors depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.

General specifications of Phase Control Thyristors Semikron and Replacements

I2t VT(TO) rT Rth(j-c) W Package,
A V A A2·s V mΩ K/W g mm PDF
Thyristors Stud Type
SKT 10 SKT 10/06D 10 600-1200 210 220 1.0 18.0 1.2 7 B1
ATS10-06D Datasheet
SKT 10/08D ATS10-08D
SKT 10/12E ATS10-12E
SKT 16 SKT 16/04D 16 400-1800 330 550 1.0 20.0 0.8 13 B2
ATS16-04D Datasheet
SKT 16/06D ATS16-06D
SKT 16/08D ATS16-08D
SKT 16/12E ATS16-12E
SKT 16/14E ATS16-14E
SKT 16/16E ATS16-16E
SKT 16/18E ATS16-18E
SKT 24 SKT 24/04D 24 400-1800 380 720 1.0 10.0 0.8 13 B2
ATS24-04D Datasheet
SKT 24/08D ATS24-08D
SKT 24/12E ATS24-12E
SKT 24/14E ATS24-14E
SKT 24/16E ATS24-16E
SKT 24/18E ATS24-18E
SKT 40 SKT 40/04D 40 400-1800 600 1800 1.0 9.0 0.6 22 B3
ATS40-04D Datasheet
SKT 40/06D ATS40-06D
SKT 40/08D ATS40-08D
SKT 40/12E ATS40-12E
SKT 40/14E ATS40-14E
SKT 40/16E ATS40-16E
SKT 40/18E ATS40-18E
SKT 50 SKT 50/06D 50 600-1800 900 4000 1.1 5.0 0.57 22 B3
ATS50-06D Datasheet
SKT 50/08D ATS50-08D
SKT 50/12E ATS50-12E
SKT 50/14E ATS50-14E
SKT 50/16E ATS50-16E
SKT 50/18E ATS50-18E
Thyristors Stud Type with flexible lead
SKT 55 SKT 55/04D 55 400-1800 1100 6000 0.9 4.0 0.4 100 B5
ATS55-04D Datasheet
SKT 55/06D ATS55-06D
SKT 55/08D ATS55-08D
SKT 55/12E ATS55-12E
SKT 55/14E ATS55-14E
SKT 55/16E ATS55-16E
SKT 55/18E ATS55-18E
SKT 80 SKT 80/06D 80 600-1800 1500 11000 1.2 4.0 0.25 100 B5
ATS80-06D Datasheet
SKT 80/08D ATS80-08D
SKT 80/12E ATS80-12E
SKT 80/14E ATS80-14E
SKT 80/16E ATS80-16E
SKT 80/18E ATS80-18E
SKT 100 SKT 100/04D 100 400-1800 1750 15300 1.0 2.4 0.25 100 B5
ATS100-04D Datasheet
SKT 100/08D ATS100-08D
SKT 100/12E ATS100-12E
SKT 100/14E ATS100-14E
SKT 100/16E ATS100-16E
SKT 100/18E ATS100-18E
SKT 130 SKT 130/04D 130 400-1600 3000 45000 1.2 2.2 0.16 250 B6
ATS130-04D Datasheet
SKT 130/06D ATS130-06D
SKT 130/08D ATS130-08D
SKT 130/12E ATS130-12E
SKT 130/14E ATS130-14E
SKT 130/16E ATS130-16E
SKT 160 SKT 160/04D 130 400-1600 3750 70000 1.0 1.5 0.16 250 B6
ATS160-04D Datasheet
SKT 160/06D ATS160-06D
SKT 160/08D ATS160-08D
SKT 160/12E ATS160-12E
SKT 160/14E ATS160-14E
SKT 160/16E ATS160-16E
SKT 250 SKT 250/04D 250 400-1600 6000 180000 1.0 0.7 0.11 490 B7
ATS250-04D Datasheet
SKT 250/08D ATS250-08D
SKT 250/12E ATS250-12E
SKT 250/14E ATS250-14E
SKT 250/16E ATS250-16E
SKT 300 SKT 300/04D 300 400-1600 10000 500000 0.9 0.5 0.01 490 B7
ATS300-04D Datasheet
SKT 300/08D ATS300-08D
SKT 300/12E ATS300-12E
SKT 300/14E ATS300-14E
SKT 300/16E ATS300-16E
Thyristors Disc Type
SKT 340 SKT 340/12E 340 1200-1800 5200 135000 1.0 0.9 0.07 61 B8
ATD340-12E Datasheet
SKT 340/16E ATD340-16E
SKT 340/18E ATD340-18E
SKT 551 SKT 551/12E 550 1200-1800 8000 320000 0.925 0.45 0.045 105 B11
ATD551-12E Datasheet
SKT 551/16E ATD551-16E
SKT 551/18E ATD551-18E
SKT 553 SG SKT 553/04DSG 554 400-1800 8000 320000 0.92 0.45 0.045 85 B11b
ATD553-04DSG Datasheet
SKT 553/08DSG ATD553-08DSG
SKT 553/12ESG ATD553-12ESG
SKT 553/14ESG ATD553-14ESG
SKT 553/16ESG ATD553-16ESG
SKT 553/18ESG ATD553-18ESG
SKT 760 SKT 760/12E 760 1200-1800 13000 845000 0.92 0.3 0.038 240 B10
ATD760-12E Datasheet
SKT 760/16E ATD760-16E
SKT 760/18E ATD760-18E
SKT 813 SKT 813/04D 855 400-1800 13000 845000 0.92 0.30 0.029 125 B21
ATD813-04D Datasheet
SKT 813/08D ATD813-08D
SKT 813/12E ATD813-12E
SKT 813/16E ATD813-16E
SKT 813/18E ATD813-18E
SKT 883 SKT 883/04D 880 400-1800 15500 1200000 0.85 0.26 30.0 280 B23
ATD883-04D Datasheet
SKT 883/08D ATD883-08D
SKT 883/12E ATD883-12E
SKT 883/16E ATD883-16E
SKT 883/18E ATD883-18E
SKT 1200 SKT 1200/18E 1200 1200-1800 25500 3251250 0.95 0.18 0.021 480 B14
ATD1200-18E Datasheet

Part Numbering Guide for Phase Control Thyristors:

A TD 1200 18 E
TD Product group:
TD: Thyristor Disc
TS: Thyristor Stud
1200 Average on-state current IT(AV), Amp.
E dv/dt class:
D: 500 V/µs
E: 1000 V/µs

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, avalanche, rotor and welding diodes, triacs etc.) currents up to 15000A and voltages to 9000V, and air and water heatsinks to them.
You can buy semiconductor devices in any volumes, and when ordering large lots, the price will be lower. We have earned the trust of customers and supply products all over the world.

For questions regarding the acquisition of Power Thyristors, Diodes, Modules send an email request to:

[email protected]

And we will provide you a commercial offer for delivery.
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.

Photo Gallery

The photo gallery shows many different semiconductor devices, semiconductor chips and SCRs produced by AS ENERGITM, examples of test reports.

Photo of Discrete Thyristors:

Installation recommendations for power thyristors:

Assembling disc thyristor with a heatsink

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.

icon Why choose AS ENERGITM

  • Own production facilities, including semiconductor silicon chips production
  • European brand - 100% quality, favorable price, short production terms
  • Over 20 years of experience in the semiconductor industry
  • Clients from more than 50 countries trust us
  • 20000 items in the product line for currents from 10A to 15000A, voltages from 100V to 9000V
  • We produce analogues of other manufacturers' products
  • Guaranteed certified quality, warranty period of operation - 2 years


Quality Warranty

Our products are certified and correspond to international standards.
Our company provides a quality guarantee for products of 2 years.
We provide certificates of conformity, reliability reports, data sheets and technical passports at the request of the customer.


Each product is tested for the main parameters, and Test reports of the parameters for each product are provided.

Test Report

Geography of partnership

AS ENERGITM company manufactures and supplies power semiconductors to more than 50 countries around the world.


Logistics and Delivery

We deliver our products all over the world with the services of logistics companies: DHL, TNT, UPS, EMS, Fedex, Aramex.
Products can be delivered by any means of transport: air, sea, rail and road.


AS ENERGITM Semiconductors Manufacturing

Our products range includes rectifier diodes, phase control thyristors in disc and stud design, avalanche diodes and thyristors, fast switching, high frequency thyristors, fast recovery, welding and rotor diodes, triacs, bridge rectifiers, power modules (thyristor, diode, thyristor-diode, IGBT), and air and water heatsinks to them.

Power diodes and thyristors are produced for currents from 10A to 15000A, voltage range from 100V to 9000V.
Power diode and thyristor modules are produced from 25A and up to 1250A, voltage range 400V - 4400V.
The range of power semiconductors also includes equivalent, replacement, analogue and alternative semiconductor devices of global manufacturers.

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