Rectifier Diode 400A type D171-400 (300V – 1800V)

Average forward current, IFAV 400A
Voltage, VRRM 300–1800V
Voltage code, VRRM / 100 3 – 18
D171-400 on request
Weight 465 g
Datasheet Datasheet

Rectifier Stud Diode D171-400 AS ENERGITM is general purpose diode. This is a power p-n junction diode designed for converting DC and AC currents up to 400A with frequency up to 500Hz in circuits with voltages up to 300V – 1800V (voltage class from 3 to 18). Diode package – SD7, mounting standard thread – М24х1.5, (on request, UNF thread 3/4"-16UNF-2A), weight – 465 g.

Diodes are supplied in stud design. Polarity of the diode is marked by a polarity symbol on the case.
Forward polarity diode – the threaded base of the diode is the Anode, the flexible power lead is the Cathode.
Reverse polarity diode – threaded base is the Cathode, the flexible power lead is the Anode.
Forward polarity is not indicated in the part numbering; Reverse polarity is indicated by an "X" in the part numbering.

This power diode can be an alternative product, replacement, analog, equivalent for other types diodes 350A, 370A, 390A, 400 amp in a stud mount package.

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

The diodes have a hermetic ceramic housing isolating the functional part and the semiconductor element from mechanical impacts and environment. Stud screw fit diode with a flexible power lead. Stud diodes are notable for their ability to be used on moving parts.

Specifications and parameters, datasheets PDF, sample technical passport, dimensions, outline drawings, case diagrams diodes, recommended heat sinks are listed below.

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

Diode ratings: D171-400-3 (400A 300V), D171-400-4 (400A 400V), D171-400-5 (400A 500V), D171-400-6 (400A 600V), D171-400-7 (400A 700V), D171-400-8 (400A 800V), D171-400-9 (400A 900V), D171-400-10 (400A 1000V), D171-400-12 (400A 1200V), D171-400-14 (400A 1400V), D171-400-16 (400A 1600V), D171-400-18 (400A 1800V).

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

General specifications of rectifier diodes D171-400:

Diode specifications D171-400
Maximum allowable average forward current (Case temperature) IF(AV) (Tcase) 400 A (150ºC)
Repetitive peak reverse voltage VRRM 300-1800 V
RMS forward current IFRMS 625 A
Surge non-repetitive current IFSM 14.0 kA
Safety factor I2t 980 kA2·s
Peak forward voltage, max VFM 1.4 V
Peak current IFM 1256 A
On-state threshold voltage, max VF(TO) 0.90 V
On-state slope resistance, max rT 0.56 mΩ
Repetitive peak reverse currents, max IRRM 50 mA
Temperature of p-n junction, max Tvj max 190 ºC
Thermal resistance, junction to case, max Rth(j-c) 0.085 ºC/W
Mounting torque Md 30±5 N·m
Weight, approx. W 465 g
Package type, Thread Outline SD7
Recommended heatsinks Heatsinks O181, O281, OM105
Datasheet PDF PDF

Part Numbering Guide for Rectifier Stud Diode D171-400:

D 171 400 18
D Diode, brand AS ENERGITM
171 Diode type (stud type).
400 Average forward current in open state IF(AV), Amp.
X None = Forward polarity diode: threaded base – Anode, flexible power lead – Cathode;
X = Reverse polarity diode: threaded base – Cathode, flexible power lead – Anode.
18 Voltage class VRRM / 100  (Nominal voltage – 1800 V).
U None = stud base metric ISO threads (standard);
U = stud base inch UNF threads (on request).

Polarity (anode, cathode) and dimensions of stud diodes D171-400:

Diode polarity Dimensions

Diode D171-400 datasheet:

PDFDownload pdf datasheet for diodes D171-400

Technical Passport for Rectifier Stud Type Diodes (sample):

When supplying diodes, if necessary, we provide technical passport and certificate of conformity.

  • Diode Technical Passport
  • Diode Technical Passport
  • Diode Technical Passport

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, rotor and welding diodes, triacs etc.) currents up to 15000A and voltages to 9000V, and air and water heatsinks to them. You can buy semiconductors 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 diodes:

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".

Photo of Stud Type Rectifier Diodes:

  • Stud Rectifier Diodes
  • Stud Rectifier Diodes
  • Stud Rectifier Diodes

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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