Extra Fast Recovery Diodes IXYS WESTCODE Replacement

Extra Fast Recovery Diodes in disc design are press pack type general-purpose diodes with blocking voltages up to 5200V and current ratings up to 1600A.

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

youtubeVideo: Reviews of high power disc diodes

icon AS ENERGITM Semiconductors Manufacturing Reference

Extra Fast Recovery Diodes are designed to offer the lowest practical values of reverse recovery current whilst offering wide safe operating area and high di/dt capability required by modern switching components.

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

General specifications of Extra Fast Recovery Diodes IXYS WESTCODE and Replacements

IFSM I2t Irm trr VT0 rT Tvj max RthJK Case Dimensions
Data sheet
V A A A2·s A μs V mΩ ºC K/W mm PDF
F0240YC250 2500 240 3100 48.1x103 40 2.00 2.271 2.853 150 0.1000 W2 42x25x14 ADDF0240YC250
F0240YC300 3000 ADDF0240YC300
F0240YH250 2500 240 3100 48.1x103 40 2.00 2.271 2.853 150 0.1000 W3 42x25x26 ADDF0240YH250
F0240YH300 3000 ADDF0240YH300
F0300WC140 1400 240 2700 36.5x103 530 3.00 1.760 2.210 125 0.0950 W1 42x19x14 ADDF0300WC140
F0300WC180 1800 ADDF0300WC180
F0800LC140 1400 775 7630 291x103 380 1.10 1.494 0.692 125 0.0320 W4 58x34x27 ADDF0800LC140
F0800LC180 1800 ADDF0800LC180
F0900VC450 4500 816 10450 546x103 120 3.80 2.024 1.274 115 0.0160 W6 102x63x34 ADDF0900VC450
F0900VC520 5200 ADDF0900VC520
F0900VF450 4500 816 10450 546x103 120 3.80 2.024 1.274 115 0.0160 W43 100x63x26 ADDF0900VF450
F0900VF520 5200 ADDF0900VF520
F1000LC080 800 826 8500 361x103 320 1.60 1.530 0.547 125 0.0320 W4 58x34x27 ADDF1000LC080
F1000LC120 1200 ADDF1000LC120
F1300NC45P 4500 1346 20800 2.16x106 470 4.30 1.569 0.318 140 0.0240 W5 74x47x27 ADDF1300NC45P
F1300NC50P 5000 ADDF1300NC50P
F1300NC55P 5500 ADDF1300NC55P
F1300NH45P 4500 1346 20800 2.16x106 470 4.30 1.569 0.318 140 0.0240 W47 74x47x14 ADDF1300NH45P
F1300NH50P 5000 ADDF1300NH50P
F1300NH55P 5500 ADDF1300NH55P
F1400NC140 1400 1093 17250 1.49x106 800 1.50 1.618 0.388 125 0.0240 W5 74x47x27 ADDF1400NC140
F1400NC180 1800 ADDF1400NC180
F1400ND140 1400 1093 17250 1.49x106 800 1.50 1.618 0.388 125 0.0240 W37 74x47x21 ADDF1400ND140
F1400ND180 1800 ADDF1400ND180
F1500NC200 2000 1054 13750 950x103 1065 1.50 1.372 0.535 125 0.0240 W5 74x47x27 ADDF1500NC200
F1500NC250 2500 ADDF1500NC250
F1600NC080 800 1326 20000 2.0x106 480 2.30 1.320 0.268 125 0.0240 W5 74x47x27 ADDF1600NC080
F1600NC120 1200 ADDF1600NC120

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 Extra Fast Recovery Diodes:

A DDF 1400 ND 18 0
DDF Product group: Diode Disc type, Extra Fast Recovery Diode.
1400 Average forward current IF(AV), Amp.
ND Housing (package) type.
18 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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