Fast Switching Thyristors IXYS WESTCODE 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 ATDP AS ENERGITM are a replacement, analog, alternative for Fast Switching Thyristors IXYS UK Westcode, Littelfuse Technology, formerly Westcode Semiconductors.

"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 400V up to 1200V, current from 295A up to 1007A 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.

Read more

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 IXYS WESTCODE and Replacements

ITSM I2t tq VT0 rT Tvj max RthJK Case Dimensions
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

Drawings (outlines) and housings dimensions for Fast Switching Thyristors:

Package type Mounting force Fm Dimensions ØDxØdxH Weight
WC W8 4 - 6 kN 42x19x14 mm 0.07 kg
LC W10 10 - 20 kN 58x34x27 mm 0.34 kg
YC W58 5 - 9 kN 42x25x14 mm 0.09 kg

Part Numbering Guide for Fast Switching Thyristors:

A TDP 0515 WC 06 D
TDP Product group: Fast Switching Thyristor (Disc type).
0515 Average on-state current IT(AV), Amp.
WC Housing (package) type.
06 Voltage code VRRM / 100.
D Turn-off time code tq:
A = 10 μs, B = 12 μs, C = 15 μs, D = 20 μs, E = 25 μs, F = 30 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 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.

Featured Products:


Tags: Fast Switching Thyristor, SCR Thyristor, Fast Turn-Off Thyristor, press pack thyristor, power semiconductor, Westcode replacement, IXYS Discrete Semiconductor, Westpack outline, fast thyristor price, scr thyristor datasheet, thyristor switching circuits, certificate, manufacturing, thyristors factory made, technical specification of power thyristor


Selected Products: