Avalanche Thyristors TL (TA) – Stud (250A - 320A) Flexible Lead

Stud Avalanche Thyristors TL (TA), regulating and converting DC and AC currents up to 320A in circuits with voltages to 1200V (depends on the thyristor type).

Features: self protected against transient over-voltages; guaranteed maximum avalanche power dissipation.

"Air-cooled heatsinks O series for stud devices", for avalanche thyristor cooling are also available to order.

Part numbering guide for avalanche thyristor

icon AS ENERGITM Semiconductors Manufacturing Reference

Air and water 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 TL (TA) AS ENERGITM have the following features: low static and dynamic losses, high 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.

Our company provides a quality guarantee for 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 of avalanche thyristors depends on the voltage class, quantity, delivery terms, manufacturer, country of origin and form of payment.

General specifications of Stud (Flexible Lead) Avalanche Thyristors 250A - 320A

Type IT(AV) VRRM/VDRM ITSM dv/dt di/dt VT(TO) rT IDRM IGT VGT PRSM Rth(j-c)
W Pack Data-sheet
A V kA V/µs A/µs V mΩ mA mA V kW ºC/W g type PDF
TL171-250-6 250 600 6.0 200-1000 125 1.2 0.7 35 250 3.5 40 0.100 440 ST7 -
TL171-250-7 700
TL171-250-8 800
TL171-250-9 900
TL171-250-10 1000
TL171-250-11 1100
TL171-250-12 1200
TL171-320-6 320 600 8.5 200-1000 160 1.2 0.48 35 250 3.5 40 0.085 440 ST7 -
TL171-320-7 700
TL171-320-8 800
TL171-320-9 900
TL171-320-10 1000
TL171-320-11 1100
TL171-320-12 1200
TL271-250-6 250 600 8.0 320-1000 800 1.045 0.767 35 250 2.5 16 0.085 440 ST7
TL271-250-7 700
TL271-250-8 800
TL271-250-9 900
TL271-250-10 1000
TL271-250-11 1100
TL271-250-12 1200
TL271-320-6 320 600 9.0 320-1000 800 1.012 0.717 35 250 2.5 16 0.085 440 ST7
TL271-320-7 700
TL271-320-8 800
TL271-320-9 900
TL271-320-10 1000
TL271-320-11 1100
TL271-320-12 1200
TL371-250-6 250 600 6.0 200-1000 125 1.00 0.95 35 250 3.5 16 0.100 440 ST7 -
TL371-250-7 700
TL371-250-8 800
TL371-250-9 900
TL371-250-10 1000
TL371-250-11 1100
TL371-250-12 1200
TL371-320-6 320 600 8.5 200-1000 320 1.05 0.53 35 250 3.5 16 0.085 440 ST7 -
TL371-320-7 700
TL371-320-8 800
TL371-320-9 900
TL371-320-10 1000
TL371-320-11 1100
TL371-320-12 1200

Part Numbering Guide for Stud Avalacnhe Thyristors:

TL 371 - 250 - 7
TL Thyristor Avalanche (alternative marking "TA") brand AS ENERGITM
371 Thyristor type (stud type, flexible lead).
250 Average current in open state IT(AV), Amp.
7 Voltage class VRRM / 100.

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.

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

    TL171, TA271, TA371

  • Photo of avalanche thyristors TL271-250


  • Photo of avalanche thyristors TL271-250


  • Photo of avalanche thyristors TL271-250


  • Photo of avalanche thyristors TL271-250


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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