Welding Diodes ZP series

Welding Diodes ZP series AS ENERGITM are available with forward current IFAV ratings from 4000A to 18000A and reverse blocking voltages VRRM from 200V to 600V.

Welding diodes is designed with improved losses for medium frequency resistance welding and high current rectifier applications. They all feature low on-state voltage (VRRM of 200-600V) that delivers an exceptionally high forward current, low static losses and very low thermal resistance.

"Air-cooled heatsinks O series for disc devices", "Air heatsink SF series", "Water heatsink SS series" for diode cooling are also available to order.

Part numbering guide for welding diodes

youtubeVideo: Reviews of high power disc diodes

icon AS ENERGITM Semiconductors Manufacturing Reference

Welding diodes are available in light package, thin and hermetically sealed ceramic housings. Industry standard design housing enables easy installation into existing equipment.

Features of welding diodes: capsule type metal-ceramic package with pressure contacts or slim package without external case, medium voltage, high current rectifier diode with slim package for lowest thermal resistance, low power dissipation and low thermal resistance, especially suited for water cooling, forward selections for paralleling available.

Series of welding diodes has the following features: ability to conduct high mean forward current, allowing to reduce the amount of parallel devices; high resistance to electric and thermal cycling ensures a long service life; minimal static losses; high maximal junction temperature (Tjmax) allows these diodes to conduct higher current with the same cooling system; possibility of double-sided cooling; optimized for high current rectifiers; very low thermal resistance; designed for medium and high frequency welding equipment.

Rectifier Diodes AS ENERGITM have the following features: low static and dynamic losses, high values of VRSM/VRRM, extensive experience of using the devices in various industries, range of voltages from 100 to 9000 V and amperages from 100 to 7500 A, high resistance to thermal and electric cycling.

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

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

General specifications of Welding Diodes ZP series AS ENERGITM

Type IF(AV)M
VRRM IFSM I2t VF(T0) rT Tvj max Rth(j-c) Rth(c-h) Fm W Package Outline, Dimensions ØDxØdxH
A V kA kA2·s V mΩ ºC ºC/W ºC/W kN kg mm
Housing Welding Diodes
ZP4000-(02...06) 5000 200-600 45 10 0.80 0.030 170 0.010 0.005 20-25 0.14 D1 61x44x8
ZP7100-(02...06) 7100 200-600 55 15 0.75 0.025 170 0.010 0.005 20-25 0.14 D1 61x44x8
ZP12000-(02...06) 11000 200-600 85 36 0.75 0.020 170 0.006 0.003 35-40 0.22 D2 75x57x8
ZP16000-(02...06) 16000 200-600 120 72 0.80 0.019 190 0.004 0.002 50-60 0.55 D3 100x68x12
Housingless Welding Diodes
ZP10500-(02...06) 10500 200-600 70 25 0.80 0.03 170 0.0050 0.0026 30-50 0.11 D18 56x50x5
ZP13500-(02...06) 13500 200-600 85 36 0.75 0.02 170 0.0039 0.0025 35-70 0.15 D19 64x58x5
ZP18000-(02...06) 18000 200-600 120 72 0.80 0.02 190 0.0035 0.0020 70-80 0.20 D20 75x68x5

Part Numbering Guide for Welding Diodes:

ZP 18000 - 06
ZP Diode Welding brand AS ENERGITM
18000 Average on-state current IF(AV), Amp.
06 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 of Welding Diodes:

Installation recommendations for disc type power rectifier diodes:

Assembling a diode with a heatsink

The reliability of heat transfer and electrical contact between the mating surfaces of the diode and the cooler over the entire temperature range is ensured by appropriate torque (clamping force).

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

After inspection, fix the current contacts (leads), install a pin to fix the alignment of the structure.

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.

Install the diode (3), the second part of the cooler, the fiberglass insulator and the thrust washer.

To thread the traverse (4) and evenly tighten the nuts. Make sure no misalignment and evenness of the contact surfaces.

When the parts are sufficiently clamped but moveable, we recommend placing the cooler on a flat surface and checking the tolerance for parallelism of the overall adjacent plane of the surfaces (5).

Clamp each nut in turn (about a quarter turn) to the stop (6). The amount of deflection of the traverse determines whether the achieved clamping force corresponds to the required one.

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

Tips and recommendations for power diodes:

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

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

It is strictly forbidden to touch power diodes 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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