Diode Rectifier D171-500 (400 – 1800V), Stud Type

Average forward current, IFAV 500A
Voltage, VRRM 400–1800V
Voltage code, VRRM / 100 4 – 18
D171-500 on request
Weight 465 g
Datasheet Datasheet

Rectifier Stud Diode D171-500 AS ENERGITM is general purpose diode. This is a power p-n junction diode designed for converting DC and AC currents up to 500A with frequency up to 500Hz in circuits with voltages up to 400V – 1800V (voltage class from 4 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 450A, 470A, 490A, 500 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: D171-500-4 (500A 400V), D171-500-5 (500A 500V), D171-500-6 (500A 600V), D171-500-7 (500A 700V), D171-500-8 (500A 800V), D171-500-9 (500A 900V), D171-500-10 (500A 1000V), D171-500-12 (500A 1200V), D171-500-14 (500A 1400V), D171-500-16 (500A 1600V), D171-500-18 (500A 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 D171-500:

Diode specifications D171-500
Maximum allowable average forward current (Case temperature) IF(AV) (Tcase) 500 A (150ºC)
Repetitive peak reverse voltage VRRM 400-1800 V
RMS forward current IFRMS 785 A
Surge non-repetitive current IFSM 16.0 kA
Safety factor I2t 1200 kA2·s
Peak forward voltage, max VFM 1.4 V
Peak current IFM 1570 A
On-state threshold voltage, max VF(TO) 0.90 V
On-state slope resistance, max rT 0.38 mΩ
Repetitive peak reverse currents, max IRRM 40 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
Datasheet PDF PDF

Part Numbering Guide for Rectifier Stud Diode D171-500:

D 171 500 18
D Diode, brand AS ENERGITM
171 Diode type (stud type).
500 Average forvard 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 D171-500:

Diode polarity Dimensions

Diode D171-500 datasheet:

PDFDownload pdf datasheet for diodes D171-500

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 cooperate with companies from neighboring countries.

For questions regarding the acquisition of Power Thyristors, Diodes, Modules send an email request to:


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.

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 coolers "Air-heatsink" and "Water-heatsink".

Photo of Stud Type Rectifier Diodes:

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

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