Fast Switching Thyristors Techsem Replacement

Fast Switching Thyristors, also known as Fast Turn Off Thyristors, ensure low switching losses and high di/dt performance. Fast switching thyristors are suitable for existing inverter, DC chopper drives, UPS and pulse power applications.

Thyristors ATYF AS ENERGITM are a replacement, analog, alternative for Fast Switching Thyristors Techsem.

"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 fast switching thyristors

youtubeVideo: Reviews of high power disc thyristors

icon AS ENERGITM Semiconductors Manufacturing Reference

Fast Switching Thyristors (fast turn-off capsule type thyristors) are available from 800V up to 4800V, current from 490A up to 4890A and turn-off time tq from 10μs up to 30μs.

The thyristor has an industry standard ceramic housing making it easy to integrate the device into existing equipment. This thyristor has a disc housing with pressure contacts. The polarity of the thyristor is determined by the icon on the case. The technical specifications, part numbering guide, datasheets PDF, outline drawings for thyristors are listed below.

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 10 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 fast switching thyristors depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.

General specifications of Fast Switching Thyristors Techsem and Replacements

Type I T(AV)
(T C=55°C)
I TSM I 2t V T0 r T T vj max R th(j-c) W Dimensions
Data sheet
A V kA kA 2·s V mΩ ºC K/W g mm PDF
Y30KKE 490 800-1600 4.5 92 1.6 0.91 125 0.045 80 42x25x15 ATY30FE
Y38KKE 850 800-1800 9 405 1.36 0.53 125 0.035 250 58.5x34x26 ATY38FE
Y40KKE 1080 800-1800 10 500 1.3 0.48 125 0.028 320 66x42x26 ATY40FE
Y45KKE 1220 800-1800 12 720 1.32 0.48 125 0.024 380 69x45x26 ATY45FE
Y50KKE 1330 800-1800 14 980 1.56 0.33 125 0.02 440 74x47x26 ATY50FE
Y55KKE 1330 800-1800 16 1280 1.51 0.32 125 0.018 590 84x55x26 ATY55FE
Y60KKE 1750 800-1800 18 1620 1.48 0.28 125 0.016 650 84x55x26 ATY60FE
Y65KKE 2080 800-1800 21 2205 1.41 0.24 125 0.013 820 100x63x26 ATY65FE
Y70KKE 2240 800-1800 23 2645 1.45 0.19 125 0.012 880 100x63x26 ATY70FE
Y76KKE 2940 800-1800 35.6 6337 1.3 0.14 125 0.01 1100 109x73x26 ATY76FE
Y89KKE 4470 800-1800 45 10125 1.14 0.23 125 0.007 1390 118x84x35 ATY89FE
Y65KKG 1920 1900-2500 21 2205 1.48 0.18 125 0.013 820 100x63x26 ATY65FG
Y70KKG 2160 1900-2500 22.7 2576 1.48 0.14 125 0.012 880 100x63x26 ATY70FG
Y76KKG 2790 1900-3000 33.8 5712 1.48 0.1 125 0.01 1100 109x73x26 ATY76FG
Y89KKG 3800 1900-2500 44 9680 1.32 0.14 125 0.007 1390 118x84x27 ATY89FG
Y100KKG 4890 1900-3000 62 19220 1.3 0.13 125 0.005 2000 142x100x26.5 ATY100FG
Y70KKJ 1770 3100-4000 18 1620 1.65 0.38 125 0.012 880 100x63x26 ATY70FJ
Y76KKJ 2040 3100-4000 23 2645 1.89 0.42 125 0.010 1100 110x73x26 ATY76FJ
Y89KKJ 3370 3100-4000 31 6125 1.48 0.18 125 0.007 1390 118x84x26 ATY89FJ
Y100KKJ 4370 3100-4000 44 9680 1.48 0.16 125 0.005 2000 142x100x26.5 ATY100FJ
Y89KKM 3290 4100-4800 35 6125 1.58 0.18 125 0.007 1390 118x84x26 ATY89FM
Y100KKM 4290 4100-4800 44 9680 1.58 0.16 125 0.005 2000 142x100x26.5 ATY100FM

Part Numbering Guide for Fast Switching Thyristors:

A TY 50 F E - 1330 - 16
TY Product group: Thyristor.
50 Series of thyristors.
F Type of Thyristor: Fast Switching (Fast Turn-off).
E Range of classes:
E: 800-1600V
G: 1900-3000V
J: 3100-4000V
M: 4100-4800V
1330 Average on-state current IT(AV), Amp.
16 Voltage code VRRM / 100.

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 High Power Disc 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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