Rectifier Diode 250A type D371-250 (4000V – 4400V)
|Average forward current, IFAV||250A|
|Voltage code, VRRM / 100||40 – 44|
Rectifier Stud Diode D371-250 AS ENERGITM is general purpose diode. This is a power p-n junction diode designed for converting DC and AC currents up to 250A with frequency up to 500Hz in circuits with voltages up to 4000V – 4400V (voltage class from 40 to 44). 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 220A, 230A, 240A, 250 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: D371-250-40 (250A 4000V), D371-250-42 (250A 4200V), D371-250-44 (250A 4400V).
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 D371-250:
|Maximum allowable average forward current (Case temperature)||IF(AV) (Tcase)||250 A (116ºC)|
|Repetitive peak reverse voltage||VRRM||4000-4400 V|
|RMS forward current||IFRMS||392 A|
|Surge non-repetitive current||IFSM||5.4 kA|
|Safety factor||I2t||146 kA2·s|
|Peak forward voltage, max||VFM||2.10 V|
|Peak current||IFM||785 A|
|On-state threshold voltage, max||VF(TO)||1.34 V|
|On-state slope resistance, max||rT||0.98 mΩ|
|Repetitive peak reverse currents, max||IRRM||50 mA|
|Temperature of p-n junction, max||Tvj max||160 ºC|
|Thermal resistance, junction to case, max||Rth(j-c)||0.090 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|
Part Numbering Guide for Rectifier Stud Diode D371-250:
|D||–||Diode, AS ENERGITM|
|371||–||Diode type (stud type).|
|250||–||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.
|44||–||Voltage class VRRM / 100 (Nominal voltage – 4400 V).|
|U||–||None = stud base metric ISO threads (standard);
U = stud base inch UNF threads (on request).
Diode D371-250 datasheet:
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:
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.
Photo of Stud Type Rectifier Diodes: