Standard Fast Recovery Diodes IXYS WESTCODE Replacement

Fast Recovery Diodes in disc design are press pack type general-purpose diodes with blocking voltages up to 4500V and current ratings up to 3770A.

Fast Recovery Diodes ADDM AS ENERGITM are a replacement, analog, alternative semiconductor devices for Standard Fast Recovery Diodes 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 recovery diodes

youtubeVideo: Reviews of high power disc diodes

icon AS ENERGITM Semiconductors Manufacturing Reference

Fast Recovery Diodes are particularly suitable for use as anti-parallel diodes used in Gate Turn-Off and Fast Thyristor inverters and as diodes for choppers.

Features: class-leading performance and reliability; optimised for line frequency; low on-state losses; high reverse voltage and high current handling capabilities, high surge capability.

Rectifier diodes convert DC and AC currents up to 12.1 kA in circuits with voltages up to 7.2 kV. Their main applications are rectifiers for variable large AC drives, traction converters, trackside substations, welding and DC power supplies. Devices are primarily intended for applications with line frequencies up to 500Hz.

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

Rectifier Diodes AS ENERGITM have the following features: low static and dynamic losses, high values of VRSM/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.

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

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The final price of fast recovery diodes depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.

General specifications of Standard Fast Recovery Diodes IXYS WESTCODE and Replacements

IFSM I2t trr VT0 rT Tvj max RthJK Case Dimensions
Data sheet
V A A A2·s μs V mΩ ºC K/W mm PDF
M0588LC400 4000 588 3955 78.2x103 3.50 2.320 1.770 150 0.0330 W4 58x34x27 ADDM0588LC400
M0588LC450 4500 ADDM0588LC450
M0790YC200 2000 790 9000 405x103 4.00 1.272 0.584 150 0.0500 W2 42x25x14 ADDM0790YC200
M0790YC250 2500 ADDM0790YC250
M0790YH200 2000 790 9000 405x103 4.00 1.272 0.584 150 0.0500 W3 42x25x26 ADDM0790YH200
M0790YH250 2500 ADDM0790YH250
M0914LC200 2000 914 8500 361x103 3.20 1.768 0.653 150 0.0320 W4 58x34x27 ADDM0914LC200
M0914LC250 2500 ADDM0914LC250
M1010NC400 4000 1010 9600 461x103 3.20 1.700 1.030 150 0.0220 W5 74x47x27 ADDM1010NC400
M1010NC450 4500 ADDM1010NC450
M1010ND400 4000 1010 9600 461x103 3.20 1.700 1.030 150 0.0220 W37 74x47x21 ADDM1010ND400
M1010ND450 4500 ADDM1010ND450
M1163NC400 4000 1163 10800 583x103 6.40 1.500 0.770 150 0.0220 W5 74x47x27 ADDM1163NC400
M1163NC450 4500 ADDM1163NC450
M1163ND400 4000 1163 10800 583x103 6.40 1.500 0.770 150 0.0220 W37 74x47x21 ADDM1163ND400
M1163ND450 4500 ADDM1163ND450
M1502NC200 2000 1502 17000 1.45x106 3.50 1.240 0.440 150 0.0220 W5 74x47x27 ADDM1502NC200
M1502NC250 2500 ADDM1502NC250
M1502ND200 2000 1502 17000 1.45x106 3.50 1.240 0.440 150 0.0220 W37 74x47x21 ADDM1502ND200
M1502ND250 2500 ADDM1502ND250
M1583VC400 4000 1583 24800 3.08x106 5.00 1.693 0.525 150 0.0160 W6 102x63x34 ADDM1583VC400
M1583VC450 4500 ADDM1583VC450
M1583VF400 4000 1583 24800 3.08x106 5.00 1.693 0.525 150 0.0160 W43 100x63x26 ADDM1583VF400
M1583VF450 4500 ADDM1583VF450
M1609NC200 2000 1609 17500 1.53x106 3.20 1.310 0.345 150 0.0220 W5 74x47x27 ADDM1609NC200
M1609NC260 2600 ADDM1609NC260
M1609ND200 2000 1609 17500 1.53x106 3.20 1.310 0.345 150 0.0220 W37 74x47x21 ADDM1609ND200
M1609ND260 2600 ADDM1609ND260
M2273VC300 3000 2273 28000 3.92x106 8.50 1.239 0.244 150 0.0160 W6 102x63x34 ADDM2273VC300
M2273VC360 3600 ADDM2273VC360
M2273VF300 3000 2273 28000 3.92x106 8.50 1.239 0.244 150 0.0160 W43 100x63x26 ADDM2273VF300
M2273VF360 3600 ADDM2273VF360
M2325HA400 4000 2325 28000 3.92x106 5.40 1.581 0.402 150 0.0105 W121 100x66x26 ADDM2325HA400
M2325HA450 4500 ADDM2325HA450
M2408NC020 200 2408 24000 2.88x106 1.90 1.065 0.122 150 0.0220 W5 74x47x27 ADDM2408NC020
M2408NC060 600 ADDM2408NC060
M2408ND020 200 2408 24000 2.88x106 1.90 1.065 0.122 150 0.0220 W37 74x47x21 ADDM2408ND020
M2408ND060 600 ADDM2408ND060
M2505MC220 2200 2505 27000 3.65x106 7.60 0.991 0.162 125 0.0140 W54 74x50x26 ADDM2505MC220
M2505MC250 2500 ADDM2505MC250
M2639ZC360 3600 2639 27520 3.79x106 8.50 1.380 0.290 150 0.0110 W7 110x73x37 ADDM2639ZC360
M2639ZC420 4200 ADDM2639ZC420
M2639ZD360 3600 2639 27520 3.79x106 8.50 1.380 0.290 150 0.0110 W42 110x73x26 ADDM2639ZD360
M2639ZD420 4200 ADDM2639ZD420
M2698ZC250 2500 2698 27800 3.86x106 6.20 1.000 0.330 150 0.0110 W7 110x73x37 ADDM2698ZC250
M2698ZC280 2800 ADDM2698ZC280
M2698ZC350 3500 ADDM2698ZC350
M2698ZD250 2500 2698 27800 3.86x106 6.20 1.000 0.330 150 0.0110 W42 110x73x26 ADDM2698ZD250
M2698ZD280 2800 ADDM2698ZD280
M2698ZD350 3500 ADDM2698ZD350
M2837VC180 1800 2837 31800 5.10x106 7.00 0.900 0.170 150 0.0160 W6 102x63x34 ADDM2837VC180
M2837VC250 2500 ADDM2837VC250
M2837VF180 1800 2837 31800 5.10x106 7.00 0.900 0.170 150 0.0160 W43 100x63x26 ADDM2837VF180
M2837VF250 2500 ADDM2837VF250
M3770ZC200 2000 3770 44000 9.68x106 7.00 1.190 0.118 150 0.0110 W7 110x73x37 ADDM3770ZC200
M3770ZC240 2400 ADDM3770ZC240
M3770ZC300 3000 ADDM3770ZC300
M3770ZD200 2000 3770 44000 9.68x106 7.00 1.190 0.118 150 0.0110 W7 110x73x37 ADDM3770ZD200
M3770ZD240 2400 3770 44000 9.68x106 7.00 1.190 0.118 150 0.0110 W42 110x73x26 ADDM3770ZD240
M3770ZD300 3000 ADDM3770ZD300

Drawings and housings dimensions for Diodes IXYS WESTCODE and Replacements:

Package type Mounting force Fm Dimensions ØDxØdxH Weight
WC W1 3 - 5 kN 42x19x14 mm 0.07 kg
YC W2 5 - 8 kN 42x25x14 mm 0.09 kg
YH W3 5 - 8 kN 42x25x26 mm 0.14 kg
LC W4 10 - 20 kN 58x34x27 mm 0.34 kg
NC W5 19 - 26 kN 74x47x27 mm 0.51 kg
VC W6 27 - 34 kN 102x63x34 mm 1.0 kg
ZC W7 27 - 47 kN 110x73x37 mm 1.7 kg
TC W28 63 - 77 kN 112x75x26 mm 1.23 kg
TD W29 63 - 77 kN 112x75x35 mm 1.7 kg
ND W37 19 - 26 kN 74x47x21 mm 0.51 kg
ZD W42 27 - 47 kN 110x73x26 mm 1.2 kg
VF W43 27 - 34 kN 100x63x26 mm 0.8 kg
NH W47 19 - 26 kN 74x47x14 mm 0.51 kg
DB W49 20 - 24 kN 62x44x8 mm 0.12 kg
FC W52 80 - 100 kN 144x100x35 mm 2.8 kg
MC W54 25 - 31 kN 74x50x26 mm 0.53 kg
FD W59 80 - 100 kN 144x100x26 mm 2.0 kg
QC W68 12 - 20 kN 60x38x26 mm 0.3 kg
TJ W89 60 - 70 kN 112x75x26 mm 1.2 kg
TE W94 60 - 70 kN 112x75x35 mm 1.7 kg
TF W97 20 - 30 kN 112x75x30 mm 1.0 kg
MF W99 12 - 16 kN 75x59x30 mm 0.6 kg
EC W111 72 - 93 kN 124x85x26 mm 1.6 kg
ED W112 76 - 93 kN 124x85x35 mm 2.2 kg
JK W113 16 - 20 kN 50x32x14 mm 0.2 kg
QA W117 16 - 20 kN 60x38x26 mm 0.33 kg
LG W120 10 - 20 kN 58x34x35 mm 0.4 kg
HA W121 32 - 40 kN 100x66x26 mm 1.2 kg
HC W122 32 - 40 kN 100x66x26 mm 1.2 kg
HE W123 32 - 40 kN 100x66x35 mm 1.2 kg
TG W125 50 - 60 kN 112x75x30 mm 1.15 kg

Part Numbering Guide for Standard Fast Recovery Diodes:

A DDM 3770 ZD 30 0
DDM Product group: Diode Disc type, Fast Recovery Diode.
3770 Average forward current IF(AV), Amp.
ZD Housing (package) type.
30 Voltage class VRRM / 100.
0 Fixed code.

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 Rectifier Diodes:

Installation recommendations for disc type power rectifier diodes:

Assembling a diode with a heatsink

The reliability of heat transfer and electrical contact between the mating surfaces of the diode 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 diode (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 diodes:

The power diodes 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 diode with a diode 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 diodes 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 diodes connected in parallel. The most popular connection methods are closed circuit, common coil circuit, or power diode. The efficiency of current dividers in this case is determined by the cross section of the magnetic wire.

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

It is strictly forbidden to touch power diodes 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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