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STMicroelectronics BYW51-200 — Discrete Semiconductors

STMicroelectronics BYW51-200 Fast Recovery Diode, 200 V

MPNBYW51-200
Obsolete

STMicroelectronics BYW51-200, Fast Recovery =< 500ns, > 200mA (Io), 200 V, 10 A per diode, 35 ns trr, 1 Pair Common Cathode, TO-220-3, Through Hole.

$1.3200Ref. price · indicative, final on quote
STMicroelectronics BYW51-200 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

BYW51-200 specifications
ParameterValue
MountingThrough Hole
Voltage - DC reverse (Vr)200 V
Voltage - forward (Vf) (Max) @ if850 mV @ 8 A
Current - reverse leakage @ vr15 µA @ 200 V
Current - average rectified (Io) (per diode)10A
Operating temperature - junction150°C (Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
TechnologyStandard
CaseTO-220-3
Diode configuration1 Pair Common Cathode
Reverse recovery time35 ns

Product details

Common-cathode fast recovery pair in TO-220-3

The 850 mV forward voltage drop at 8 A keeps conduction losses manageable, while the 150°C maximum junction temperature allows operation in thermally constrained environments such as enclosed power supplies and motor drives.

A 35 ns reverse recovery time places this diode in the fast-recovery class, suitable for switching frequencies up to several hundred kilohertz. In a continuous-conduction-mode boost or flyback converter, the trr directly sets the reverse-recovery charge that the MOSFET must absorb at turn-on; a 35 ns trr keeps that charge low enough to avoid excessive ringing or thermal stress in the active switch. The common-cathode pair lets you wire two diodes with a shared cathode connection, reducing PCB trace inductance in a centre-tapped secondary winding layout.

No last-time-buy window remains open through the original manufacturer. Sourcing is limited to verified surplus and broker-channel inventory.

Frequently asked questions

Is BYW51-200 obsolete?

Yes, the BYW51-200 carries an Obsolete lifecycle status. Supply is limited to surplus and broker-channel inventory.

What is the reverse recovery time of BYW51-200?

The reverse recovery time (trr) is 35 ns, measured under standard test conditions. This fast recovery characteristic suits it for high-frequency rectification and snubber circuits.

What is the equivalent of BYW51-200?

No pin-compatible equivalent is listed in the manufacturer's cross-reference. For a same-function fast-recovery common-cathode pair in TO-220-3, evaluate parts with similar 200 V / 10 A ratings and a trr of 35 ns or faster. Confirm the pinout and footprint against your PCB layout before substitution.