Fast Recovery Diodes Vishay Replacement

Fast Recovery Diodes, also known as Fast Diodes or Fast Switching Diodes in disc design are semiconductor devices with a short reverse recovery time.

Fast Recovery Diodes ASDD AS ENERGITM are a replacement, analog, alternative semiconductor devices for Fast Recovery Diodes Vishay Semiconductors.

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

Part numbering guide for rectifier diodes

youtubeVideo: Reviews of high power disc diodes

icon AS ENERGITM Semiconductors Manufacturing Reference

The fast recovery diodes converting DC and AC currents up to 1650A in circuits with voltages up to 4500V. Their main applications are for DC-DC converters and inverters, high-frequency rectifiers, switching power supplies.

Features: optimised for line frequency; low on-state losses; low reverse recovery time; high switching speed; high reverse voltage and high current handling capabilities.

The peculiarity of diodes is their fast recovery (short reverse recovery time trr and small recovery charge) and application at high frequencies. Diodes have a high current-carrying capacity at high frequencies.

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, datashets for diodes are listed below.

Fast Recovery 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 100 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 Fast Recovery Disc Diodes Vishay and Replacements

Type IFAV (TC) VRRM/VDRM IFSM I2t VF(TO) rT Tvj max Rth(j-c)
W Package,
A (ºC) V A kA2·s V mΩ ºC ºC/W g mm PDF
VS-SD303C04S10C 350 (55) 400 5770 166 1.63 0.77 125 0.011 70 A-PUK
VS-SD303C08S10C 800 ASDD303C08S10C
VS-SD303C10S10C 1000 ASDD303C10S10C
VS-SD303C12S15C 1200 ASDD303C12S15C
VS-SD303C14S15C 1400 ASDD303C14S15C
VS-SD303C16S15C 1600 ASDD303C16S15C
VS-SD303C20S20C 2000 ASDD303C20S20C
VS-SD303C25S20C 2500 ASDD303C25S20C
VS-SD263C30S50L 375 (55) 3000 5500 151 1.71 1.53 125 0.011 230 B-PUK
VS-SD263C36S50L 3600 ASDD263C36S50L
VS-SD263C40S50L 4000 ASDD263C40S50L
VS-SD263C45S50L 4500 ASDD263C45S50L
VS-SD403C04S10C 430 (55) 400 6180 191 1.20 0.70 125 0.011 70 A-PUK
VS-SD403C08S10C 800 ASDD403C08S10C
VS-SD403C10S10C 1000 ASDD403C10S10C
VS-SD403C12S15C 1200 ASDD403C12S15C
VS-SD403C14S15C 1400 ASDD403C14S15C
VS-SD403C16S15C 1600 ASDD403C16S15C
VS-SD553C30S50L 560 (55) 3000 12000 721 1.95 0.89 125 0.009 255 B-PUK
VS-SD553C36S50L 3600 ASDD553C36S50L
VS-SD553C40S50L 4000 ASDD553C40S50L
VS-SD553C45S50L 4500 ASDD553C45S50L
VS-SD603C04S10C 600 (55) 400 8320 346 1.81 0.67 125 0.007 83 B-43
VS-SD603C08S10C 800 ASDD603C08S10C
VS-SD603C10S10C 1000 ASDD603C10S10C
VS-SD603C12S15C 1200 ASDD603C12S15C
VS-SD603C14S15C 1400 ASDD603C14S15C
VS-SD603C16S15C 1600 ASDD603C16S15C
VS-SD603C20S20C 2000 ASDD603C20S20C
VS-SD603C22S20C 2200 ASDD603C22S20C
VS-SD703C12S20L 700 (55) 1200 9300 432 1.11 0.76 150 0.011 250 B-PUK
VS-SD703C16S20L 1600 ASDD703C16S20L
VS-SD703C20S20L 2000 ASDD703C20S20L
VS-SD703C25S20L 2500 ASDD703C25S20L
VS-SD703C12S30L 790 (55) 1200 9600 460 1.05 0.56 ASDD703C12S30L
VS-SD703C16S30L 1600 ASDD703C16S30L
VS-SD703C20S30L 2000 ASDD703C20S30L
VS-SD703C25S30L 2500 ASDD703C25S30L
VS-SD823C12S20C 810 (55) 1200 9300 432 1.11 0.76 150 0.007 83 B-43
VS-SD703C16S20L 1600 ASDD703C16S20L
VS-SD703C20S20L 2000 ASDD703C20S20L
VS-SD703C25S20L 2500 ASDD703C25S20L
VS-SD803C04S10C 845 (55) 400 11295 640 1.32 0.28 125 0.007 255 B-43
VS-SD803C08S10C 800 ASDD803C08S10C
VS-SD803C10S10C 1000 ASDD803C10S10C
VS-SD803C12S15C 1200 ASDD803C12S15C
VS-SD803C14S15C 1400 ASDD803C14S15C
VS-SD803C16S15C 1600 ASDD803C16S15C
VS-SD823C12S30C 910 (55) 1200 9600 460 1.06 0.57 150 0.007 83 B-43
VS-SD823C16S30C 1600 ASDD823C16S30C
VS-SD823C20S30C 2000 ASDD823C20S30C
VS-SD823C25S30C 2500 ASDD823C25S30C
VS-SD1053C18S30L 920 (55) 1800 13000 845 1.67 0.45 150 0.008 255 B-PUK
VS-SD1053C22S30L 2200 ASDD1053C22S30L
VS-SD1053C25S30L 2500 ASDD1053C25S30L
VS-SD1053C28S30L 2800 ASDD1053C28S30L
VS-SD1053C30S30L 3000 ASDD1053C30S30L
VS-SD853C30S50K 990 (55) 3000 19000 1810 1.67 0.65 125 0.0019 425 K-PUK
VS-SD853C36S50K 3600 ASDD853C36S50K
VS-SD853C40S50K 4000 ASDD853C40S50K
VS-SD853C45S50K 4500 ASDD853C45S50K
VS-SD1053C18S30L 1050 (55) 1800 15000 1125 1.48 0.33 150 0.008 255 B-PUK
VS-SD1053C22S20L 2200 ASDD1053C22S20L
VS-SD1053C24S20L 2400 ASDD1053C24S20L
VS-SD1053C25S20L 2500 ASDD1053C25S20L
VS-SD1553C18S30K 1650 (55) 1800 22000 2421 1.45 0.30 150 0.0019 425 K-PUK
VS-SD1553C22S30K 2200 ASDD1553C22S30K
VS-SD1553C25S30K 2500 ASDD1553C25S30K
VS-SD1553C28S30K 2800 ASDD1553C28S30K
VS-SD1553C30S30K 3000 ASDD1553C30S30K
VS-SD1553C18S20K 1825 (55) 1800 25000 3126 1.29 0.25 ASDD1553C18S20K
VS-SD1553C22S20K 2200 ASDD1553C22S20K
VS-SD1553C25S20K 2500 ASDD1553C25S20K

Part Numbering Guide for Standard Rectifier Diodes:

AS DD 82 3 C 20 S30 C
DD Product group: Fast Recovery Diode Disc.
82 Essential part number.
3 Fast recovery.
C Ceramic PUK.
20 Voltage class VRRM x 100.
S30 trr code.
C PUK case B-43.

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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