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STMicroelectronics STTH30R03CG — Discrete Semiconductors

STTH30R03CG Fast Recovery Diode, 300 V 15 A Common Cathode

MPNSTTH30R03CG
Obsolete

STMicroelectronics STTH30R03CG, Fast Recovery Diode, 300 V Vr, 15 A Io per diode, 35 ns trr, 1.9 Vf at 15 A, 20 µA leakage at 300 V, 1 Pair Common Cathode, D2PAK, Tube.

$3.2700Ref. price · indicative, final on quote
STMicroelectronics STTH30R03CG datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

STTH30R03CG specifications
ParameterValue
Diode typeStandard
MountingSurface Mount
Voltage - DC reverse (Vr)300 V
Voltage - forward (Vf) (Max) @ if1.9 V @ 15 A
Current - reverse leakage @ vr20 µA @ 300 V
Current - average rectified (Io) (per diode)15A
Operating temperature - junction175°C(Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
CaseTO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Diode configuration1 Pair Common Cathode
Reverse recovery time35 ns

Product details

Fast-recovery dual diode in a D2PAK

The STMicroelectronics STTH30R03CG is a 300 V, 15 A average-rated fast-recovery diode pair in a common-cathode configuration, housed in a surface-mount D2PAK (TO-263AB) package. It delivers a 35 ns reverse recovery time, placing it in the class of ultrafast diodes suited for continuous-current rectification in switch-mode power supplies and PFC stages. The 1.9 V forward voltage at 15 A per diode and 20 µA reverse leakage at 300 V define the conduction and blocking losses for the thermal budget.

Availability is limited to surplus and broker-channel inventory — sealed reels or factory tubes with consistent date codes, not repackaged returns. The junction temperature rating of 175 °C confirms it was designed for high-reliability power applications, so verify the date-code spread and original packaging when sourcing.

The 35 ns reverse recovery time is the key parameter for a fast-recovery diode. It determines how quickly the diode switches off when the voltage reverses, directly affecting switching losses and EMI in a hard-switched converter. A 35 ns trr at 15 A is fast enough for continuous-current-mode (CCM) boost PFC and secondary-side rectification in the 50–150 kHz range. Slower diodes would increase the turn-off loss and require larger snubbers.

Frequently asked questions

Is STTH30R03CG obsolete?

Yes, the STTH30R03CG is listed as obsolete. It is no longer manufactured by STMicroelectronics.

What is the replacement for STTH30R03CG?

For a pin-compatible alternative, look for a common-cathode ultrafast diode in D2PAK rated at 300 V and 15 A per diode with a 35 ns or faster trr. Cross-reference searches against the STTH30R03CY (different package variant) or other ST ultrafast series may yield a fit, but verify footprint and thermal pad compatibility before substituting.