Diode Module Semikron SKKD 81/20 H4 and Replacement

Semikron Product Type SKKD 81/20 H4
Average forward current, IFAV (Tcase) 82A (85ºC)
80A (87ºC)
Voltage, VRRM 2000V
Circuit Circuit
Package, Dimensions L×B×H SEMIPACK 1
Datasheet Datasheet
Replacement AS ENERGITM AMKD 81-20 H4
Add to Cart on request

Module Semikron SKKD 81/20 H4 is a dual diode rectifier module in a standard housing SEMIPACK 1.

Rectifier Diode Module AMKD 81-20 H4 AS ENERGITM is a replacement, analogue, alternative and equivalent semiconductor device for diode module SKKD 81/20 H4 Semikron.

The diode modules are characterized by high electrical and thermal cycling capability, meaning high reliability and long lifetime in intensive operation modes. The diode modules are housed in a industry-standard housing making it easy to integrate the device into existing equipment.

The main (power) terminals are on the top of the case and are marked as 123 (common anode-cathode, cathode, anode).

Dual diode modules are used in various power equipment - power and control units, power regulators, AC regulators, DC motors control, AC motor soft starters, converters, controllers of blast furnaces or chemical processes, welding equipment, and as rectifiers for AC converters.

Modules are offered in several dual and single device topologies for almost all phase control or rectifier applications.

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

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The final price for thyristor / diode modules depends on the class, quantity, delivery terms, manufacturer, country of origin and form of payment.

General specifications of Rectifier Diode Module SKKD 81/20 H4 and Replacements:

Diode module specifications SKKD 81/20 H4
Maximum allowable average forward current (Case temperature) IFAV (Tcase) 82 A (85ºC)
80 A (87ºC)
Repetitive pulsed reverse voltage VRRM 2000 V
Surge on-state current IFSM 1750 A
Safety factor I2t 15 kA2·s
Threshold voltage V(TO) 0.85 V
On-state slope resistance rT 1.8 mΩ
Junction temperature Tvj max 125 ºC
Thermal resistance, junction to case Rth(j-c) 0.40 ºC/W
Design (switches) - dual component
Type (circuit diagram) - diode-diode
Weight W 95 g
Package, Dimensions, mm L×B×H SEMIPACK 1
Replacement AS ENERGITM type AMKD 81-20 H4
Datasheet PDF Datasheet

Part numbering guide for Rectifier Diode Modules AMKD:

A M KD 81 20 H4
M Semiconductor Type: Module.
KD Topology of internal connection: Diode-Diode.
81 Rated current (ITAV), A.
20 Voltage class (VRRM/100).
H4 Option, where applicable, e.g H4 stands for Visol = 4800 V.
H1 stands for Visol = 3600 V.

Possible alternatives, replacements, analogue, equivalent products:

List of series of power diode modules with similar parameters and housing sizes.

Series IFAV (Tcase) VRRM Topology Dimensions, mm Package Datasheet
SKKD 81/20 H4 82 A (85ºC) 2000 V diode-diode 93x20x30 1 Datasheet
AMKD 81-20 H4 82 A (85ºC) 2000 V diode-diode 93x20x30 1 Datasheet

Dimensions of Rectifier Diode Module SKKD 81/20 H4:



Circuit diagram of dual diode modules:


1 (АК), 2 (К), 3 (А) – main (power) terminals.

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 Modules, Diodes, Thyristors, 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.

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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