Power Assemblies and Controllers

Circuit Protection

September 2020 - Semikron’s Discrete Diodes and Thyristors

Published on: 09/09/2020

Introducing Semikron’s discrete diodes and thyristors for low to high-power applications

Semikron Discrete Diodes and Thyristors by GD Rectifiers

Semikron offer a wide range of discrete diodes and thyristors, with a wide range of case designs available in voltage classes from 200V to 8000V and current ratings from 1A to 7500A. 

Discrete semiconductor components are used in a wide variety of applications and provide particular benefits when high current, uncommon topologies, natural cooling or stability in harsh conditions are required.

The Semikron portfolio includes axial leaded diodes up to 6A, diodes and thyristors in screw-fit (stud) and capsule housings for up to 7500A and 8000V and 1200A and 1800V for diodes and thyristors. Semikron’s discrete components provide easy assembly, hermetic sealing and rugged construction.


Avalanche Diodes

-       No overvoltage suppressors required

-       Robust in short reverse overload conditions

-       High blocking voltages possible without static or dynamic voltage sharing circuits


Discrete Applications

Semikron’s discrete components are predominantly used for welding machines, battery chargers, electroplating, soft starters, DC motor control, AC controllers, alternators and many more. Semikron’s discrete devices are convenient for both natural convection and forced cooling, allowing for a broader range of applications.

With over 50 years of experience in the power electronics industry and millions of units produced every single year, Semikron’s portfolio delivers competitive, flexible and highly reliable products and solutions.


Discrete Product Range 

Axial diodes

1a to 6A

100V to 2000V

HV axial screw diodes

Up to 2.5A

Up to 8000V

Stud (screw-fit) diodes

5A to 600A

200V to 5000V

Capsule (disc) diodes

Up to 7500A

100V to 2200V

Stud (screw-fit) thyristors

10A to 300A

400V to 1800V

Capsule (disc) thyristors

340A to 1200A

400V to 1800V


Semikron’s Discrete Components

 Semikron Discrete Devices by GD Rectifiers

Key Features

-       Recommended for forced air and water cooling

-       Compact case with high current capability

-       Stud and disc types: forward drop selections available for easy paralleling

-       Axial diodes for PCB mounting

-       Available in standard and fast versions 


Rectifier Bridges

Semikron offer a single-phase and 3-phase isolated rectifier bridges for low to medium power applications. Both standard and special topologies feature diodes, thyristors and IGBTs which are available in various case and terminal designs. For voltages ranging from 200V to 2200V and currents ranging from 9A to 494A.

Semikron’s rectifier bridges are the solution for many applications when performance, space and fast production is paramount to an engineer.

Single of 3-phase topologies featuring diodes, thyristors and IGBTs in isolated compact cases can be achieved by selecting either a solder-based connection, solderless connection with spring or press-fit contacts, or mechanical screw connections, fast-on connectors or bus bars.

Semikron’s rectifier bridges are used in a wide range of applications, including: battery chargers, motor drive input rectifiers, power supplies, DC motor control, rectifiers with PFC, AC controllers 9SKWT type) static switches for natural convection or forced cooling.


Rectifier Bridge Product Range

 From 9A to 494A, 400V to 2200V

Semikron Rectifier Bridges by GD Rectifiers


New Discrete and Rectifier Bridges 



Current I (A) @ Tc / Tamb

Voltage (V)


In-line bridges for PCB assembly


DBI 25 P

9A @ 113°C

27A @ 32°C




High-voltage diodes

SKHE 2000/900-1,2


SKHE 3500/2200-2,0

1.5A @ 45°C



2.5A @ 45°C




V(BR)=10000 VVRMS=3500



KBPC 35/10

35A @ 55°C








New stud screw diodes

SKN 46 / SKR 46

SKNa46 / SKRa 46

SKN 86 / SKR 86

SKNa 86 / SKRa 86

45A @ 125°C

45A @ 125°C

85A @130°C

85A @130°C





SW17, M8 (1/4-28 UNF 2A)

SW17, M8 (1/4-28 UNF 2A)

SW17, M8 (1/4-28 UNF 2A)

SW17, M8 (1/4-28 UNF 2A)






Disc thyristors and diodes

SKN 503 SG

SKN 1503 SG

SKN 6000

SKN 7500

SKT 553 SG

SKT 813

SKT 883


503A @ 120°C

1690A @ 75°C

6000A @ 85°C

7500A @ 85°C

554A @ 85°C

855A @ 85°C

890A @ 85°C








Ø42 x Ø25 x H14.5

Ø58 x Ø36 x H26.5

Ø60 x Ø44 x H8

Ø49.5 x Ø47.5 x H5.3

Ø42 x Ø25 x H14.5

Ø50 x Ø32 x H14.5

Ø58 x Ø36 x H26.5






Axial leaded diodes

SK 6

SKa 6

6A @ 50°C

6A @ 50°C





GD Rectifiers
are celebrating 55 years as a Semikron partner, currently servicing customers with discrete semiconductors, diodes, thyristors, IGBTs, IGBT drivers, MOSFETs, thyristor diode modules, rectifier bridges, SiC power modules, SiC hybrid power modules, heatsinks and power assemblies throughout Europe.


For further information on Semikron’s discrete diodes, thyristors and rectifier bridges please call GD Rectifiers on: 01444 243 452 or email: .(JavaScript must be enabled to view this email address).