Air Cooling Heatsink for Stud type thyristor & rectifier diode

Air Cooling Heatsinks for single-sided cooling stud type power SCR thyristors and diodes during their operation.

Heatsinks are used for semiconductor devices for currents from 10A to 500A and voltages VDRM/VRRM up to 1800V.

Heatsinks are used for stud semiconductors with metric ISO thread diameters: M5, M6, M8, M10, M12, M20x1.5, M24x1.5.

Features: natural air cooling and forced air cooling; corrosion-resistant aluminum alloy; low thermal resistance; easy installation with a mounting slot; can be either standard models can also be customizing.

For minimum electrical losses and maximum heat dissipation of the devices, the appropriate torque Md specified in the power device specifications must be observed.

Current range of SCR thyristors and rectifier diodes for which air heat sinks (coolers, radiators) are used: 10A, 15A, 16A, 20A, 25A, 30A, 32A, 40A, 50A, 60A, 63A, 80A, 100A, 125A, 150A, 160A, 200A, 250A, 300A, 320A, 400A, 500A.

The contact surfaces of the heatsink and power device must have low roughness and flatness deviations.

Before mounting the contact surfaces of the heatsink, current contact and semiconductor device should be wiped with a cloth soaked in alcohol (toluene, benzene, acetone) and it is recommended to lubricate with a thin layer of silicone-organic heat transfer paste (this is a recommendation and is not a prerequisite for installation).

Specifications and parameters, dimensions, drawings of air-cooled heat sink (radiator) are listed below.

Our company provides a quality guarantee for air cooling heatsink of 2 years from the date of purchase. When supplying heatsinks, if necessary, we provide technical passport.

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The final price of air cooling heatsink depends on the quantity, delivery terms, manufacturer, country of origin and form of payment.

Air Cooling Heatsinks for stud type power semiconductors

Type Applicable stud thread Power dissipation with natural cooling
Thermal resistance Rth(h-a) Flow resist. ΔPh Mounting torque Md, ±10% Cooling surface area Weight (without power contact) Outline, dimensions B×L×H (without power contact) Applies to devices for current
natural cooling forced cooling (airflow Vcfh=6 m/s)
W °C/W °C/W Pa N·m cm2 kg mm
Heatsink O111
M5 10 5.6 - - 2.0 - 0.092 Outline Heatsink O11135×60×40 10A - 25A
Heatsink O221
M6 18 2.8 - - 2.5 432.478 0.156 Outline Heatsink O22145×60×60 20A - 40A
Heatsink O231
M8 30 2.12 0.67 15 5.0 635.406 0.370 Outline Heatsink O23145×80×80 25A - 80A
Heatsink O331
M8 30 2.12 0.67 15 5.0 635.406 0.378 Outline Heatsink O33145×80×80 25A - 80A
Heatsink O241
M10 30 2.12 0.67 15 10 635.406 0.375 Outline Heatsink O24145×80×80 60A - 100A
Heatsink O541
M10 50 1.90 0.67 15 10 635.406 0.420 Outline Heatsink O54145×80×80 60A - 100A
Heatsink O151
M12 50 1.90 0.67 15 20 635.406 0.420 Outline Heatsink O15145×80×80 80A - 160A
Heatsink O371
M20x1.5 50 1.90 0.67 15 50 635.406 0.420 Outline Heatsink O37145×80×80 200A - 400A
Heatsink O171
M20x1.5 80 1.12 0.355 18 50 1249.94 0.670 Outline Heatsink O17170×80×100 200A - 400A
Heatsink O181
M24x1.5 80 1.12 0.355 18 60 1249.94 0.700 Outline Heatsink O18170×80×100 200A - 500A
Heatsink O271
M20x1.5 130 0.71 0.236 25 50 2173.508 1.750 Outline Heatsink O271110×110×100 200A - 400A
Heatsink O281
M24x1.5 130 0.71 0.236 25 60 2173.508 1.750 Outline Heatsink O281110×110×100 200A - 500A

Application of air cooling heatsinks for stud type semiconductors

Type Applicable stud thread Applies to devices for current Application
package type
diode, thyristor type
O111 M5 10A - 25A SD1, ST1 D112, DL112, T112, TS112
O221 M6 20A - 40A SD2, ST2 D122, DL122, T122, TS122
O231 M8 25A - 80A SD3, ST3, ST3-1 D132, DL132, T132, TS132
O331 M8 25A - 80A SD3, ST3, ST3-1 D132, DL132, T132, TS132
O241 M10 60A - 100A SD4, ST4, ST4-1 D141, T142, TS142
O541 M10 60A - 100A SD4, ST4, ST4-1 D141, T142, TS142
O151 M12 80A - 160A SD5, SD8, ST5 D151, T151, TF251
O371 M20x1.5 200A - 400A SD6, ST6 D161, DL161, T161, TS161, TS261, TF261
O171 M20x1.5 200A - 400A SD6, ST6 D161, DL161, T161, TS161, TS261, TF261
O181 M24x1.5 200A - 500A SD7, ST7, D.SB1, T.SB1 D171, DL171, T171, TL171, TL271, TL371, TS171, TF271, TFI271
O271 M20x1.5 200A - 400A SD6, ST6 D161, DL161, T161, TS161, TS261, TF261
O281 M24x1.5 200A - 500A SD7, ST7, D.SB1, T.SB1 D171, DL171, T171, TL171, TL271, TL371, TS171, TF271, TFI271

Part Numbering Guide for air cooling heatsinks:

O 2 8 1 110
O Product group: Heatsinks for semiconductors.
2 Serial number of heatsink design modification.
8 Series coding by mounting thread diameter for stud type heatsinks.
1 Serial number of the heatsink design modification for devices: 1 - stud mount version.
100 Length of the heatsink, mm.

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 Air Cooling Heatsinks for stud type semiconductors:

Recommendations for assembling a stud thyristor with an air heatsink:

Assembling stud thyristor with a heatsink

The reliability of heat transfer and electrical contact between the mating surfaces of the thyristor and the cooler over the entire temperature range is ensured by appropriate torque.

Before assembly you should perform visual inspection (1) contact surfaces for mechanical damages and wipe (2), soaked with alcohol (toluene, gasoline, acetone).

To improve the parameters of heat transfer it is recommended to lubricate (3) a thin layer of silicone thermal conductive paste before the assembly (this is a recommendation and is not a prerequisite for installation).

After installation, the fasteners (nuts and washers) must be additionally secured against corrosion.

Tips and recommendations for power thyristors:

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

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

Device under voltage

It is strictly forbidden to touch power thyristors 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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