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STMicroelectronics STTH12T06DI — Discrete Semiconductors

STTH12T06DI Fast Recovery Diode, 600 V 12 A, 20 ns trr

MPNSTTH12T06DI
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STMicroelectronics STTH12 series, STTH12T06DI — fast recovery diode, 600 V reverse voltage, 12 A average rectified current, 20 ns reverse recovery time, TO-220AC insulated through-hole package.

$3.0900Ref. price · indicative, final on quote
STMicroelectronics STTH12T06DI datasheet (PDF)
PackagingTO-220-2 Insulated, TO-220AC
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STTH12T06DI specifications
ParameterValue
MountingThrough Hole
Voltage - DC reverse (Vr)600 V
Voltage - forward (Vf) (Max) @ if2.95 V @ 12 A
Current - reverse leakage @ vr20 µA @ 600 V
Current - average rectified12A
Operating temperature - junction-40°C ~ 175°C
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
TechnologyStandard
CaseTO-220-2 Insulated, TO-220AC
Reverse recovery time20 ns

Product details

20 ns trr — the hard-switching PFC workhorse

The STTH12T06DI is a 600 V, 12 A fast recovery diode from STMicroelectronics' STTH12 series, packaged in a TO-220AC insulated through-hole case. Its 20 ns reverse recovery time places it squarely in the high-frequency rectifier and power-factor-correction (PFC) boost stage, where switching losses track trr directly.

Forward drop and leakage at temperature

Forward voltage is specified at 2.95 V maximum at 12 A — the conduction loss at full load is about 35 W, which the TO-220AC insulated tab must sink to a heatsink. Reverse leakage is 20 µA at 600 V, but rises with junction temperature; derate the blocking margin above 125 °C.

For production builds this means the BOM line does not require a bridge buy or alternate qualification now.

Frequently asked questions

Is STTH12T06DI a fast recovery diode?

Yes. The STTH12T06DI is classified as a fast recovery diode with a reverse recovery time of 20 ns, making it suitable for switching frequencies above 50 kHz in continuous-current-mode PFC stages.

What is the closest pin-compatible alternative in the STTH12 family?

Within the STTH12 series, the STTH12T06DI shares the same TO-220AC insulated package and 600 V / 12 A rating as the non-insulated STTH12R06DI — the difference is the tab insulation. For a drop-in replacement with the same trr, the STTH12T06DI is the insulated version; the non-insulated variant requires a different heatsink mounting strategy.