Avalanche Thyristor TL271-320-8 (TA271-320-8) – Stud thyristor, 320A 800V

Average forward current, ITAV (TC) 320A (100ºC)
Voltage, VDRM/VRRM 800 V
TL271-320-8 on request
Stud thread M24
Package ST7
Weight 440 g

Stud Avalanche Thyristor TL271-320-8AS ENERGITM is general purpose stud thyristor, also known as TA271-320-8. Average forward current ITAV320 ampere, repetitive peak forward and reverse blocking voltage VDRM/VRRM800V. Stud thyristors are designed to convert and control DC and AC currents. "Air-cooled heatsinks O series for stud devices" for thyristor cooling are also available to order.

Air heat sinks are used to cool the avalanche thyristors. To provide reliable thermal and electrical contact with the heatsink a tightening torque Md must be observed during assembly. For better heat dissipation of thyristor during assembly, heat conducting paste is used (this is a recommendation and is not a prerequisite for installation).

The polarity of the thyristor is determined by the icon on the case. The base of the thyristor is the Anode, the flexible power lead is the Cathode, the flexible wire exiting the base of the power lead is the auxiliary cathode, the flexible wire exiting the case is the control electrode (Gate). The technical specifications, part numbering guide, polarity, dimensions and recommended coolers for thyristors are listed below.

Air and water heat sinks are used to cool the thyristors. To provide reliable thermal and electrical contact with the heatsink a tightening torque Md must be observed during assembly. For better heat dissipation of thyristor during assembly, heat conducting paste is used.

Avalanche Thyristors AS ENERGITM have the following features: low static and dynamic losses, wide values of VDRM/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, natural or forced air cooling.

The technical specifications and parameters of avalanche thyristor TL271-320-8 (TA271-320-8), datasheet PDF, outline drawing and dimensions are listed below.

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

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The final price for stud thyristors depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.

General specifications of Stud (Flexible Lead) Avalanche Thyristor TL271-320-8 (TA271-320-8) (320A 800V):

Stud Avalanche Thyristor specifications TL271-320-8
Average forward current (Case temperature) ITAV (TC) 320 A (100ºC)
Repetitive pulsed closed state voltage; repetitive pulsed reverse voltage VDRM/VRRM 800 V
Surge on-state current ITSM 9.0 kA
On-state threshold voltage VT(TO) 1.012 V
Peak on-state voltage VTM 1.65 V
Peak on-state current ITM 1005 A
On-state slope resistance rT 0.717 mΩ
Repetitive peak off-state IDRM 35 mA
Critical rate of rise of off-state voltage (dVD/dt)cr 320-1000 V/µs
Critical rate of rise of on-state current (diT/dt)cr 800 A/µs
Gate trigger direct current IGT 250 mA
Gate trigger direct voltage VGT 2.5 V
Temperature of p-n junction Tvj max 140 ºC
Shock reverse power dissipation PRSM (tp) 16 kW (100ms)
Thermal resistance, junction to case Rth(j-c) 0.085 ºC/W
Weight W 440 g
Recommended heatsinks Heatsinks O181, O281, OM105
Package (Housing) type ST7
Stud thread - M24
Datasheet PDF

Part Numbering Guide for Stud Avalanche Thyristor:

TL 271 - 320 - 8
TL Thyristor Avalanche (alternative marking "TA") brand AS ENERGITM
271 Thyristor type (stud type, flexible lead).
320 Average current in open state IT(AV), Amp.
8 Voltage class VRRM / 100 (Nominal voltage – 800 V).

Polarity (anode, cathode, gate) and dimensions of stud avalanche thyristor TL271-320-8:

Polarity TL271-320-8 Dimensions TL271-320-8

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.

Heat sinks for power stud thyristors:

Heat sinks (radiators) are used for cooling of power semiconductor devices in stud design.

Heat sinks of coolers are made of aluminum radiator profiles and do not require additional protective coating when used in various climatic conditions.

See for more information about heatsinks: "Air-cooled heatsinks for stud devices".

Installation recommendations for power stud mount thyristors:

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, which is not a mandatory condition 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.

Photo of power thyristors TA171, TA271, TA371:

  • Photo TA171


  • Photo TA271


  • Photo TA371


  • Photo TA171, TA271, TA371

    TA171, TA271, TA371

  • Photo of avalanche thyristors TA271-250


  • Photo of avalanche thyristors TA271-250


  • Photo of avalanche thyristors TA271-250


  • Photo of avalanche thyristors TA271-250


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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