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STMicroelectronics STTH803D — Discrete Semiconductors

STTH803D Fast Recovery Diode, 8 A, 300 V, TO-220AC

MPNSTTH803D
Active

STMicroelectronics STTH803D general purpose fast recovery diode, 8 A average rectified, 300 V reverse voltage, 35 ns reverse recovery time, TO-220AC package, through-hole mounting.

$1.5700Ref. price · indicative, final on quote
STMicroelectronics STTH803D datasheet (PDF)
PackagingTO-220-2
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STTH803D specifications
ParameterValue
MountingThrough Hole
Voltage - DC reverse (Vr)300 V
Voltage - forward (Vf) (Max) @ if1.25 V @ 8 A
Current - reverse leakage @ vr20 µA @ 300 V
Current - average rectified8A
Operating temperature - junction175°C (Max)
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTube
TechnologyStandard
CaseTO-220-2
Reverse recovery time35 ns

Product details

8 A, 300 V fast recovery in a TO-220AC package

The STTH803D is a general-purpose fast recovery rectifier from STMicroelectronics, rated for 8 A average forward current and 300 V repetitive reverse voltage. It comes in the TO-220AC through-hole package, a standard footprint for power rectifiers that bolts into a heatsink or sits on a PCB with a simple two-hole pattern. The 35 ns reverse recovery time places it in the fast recovery class (under 500 ns), making it suitable for switching power supplies and freewheeling diode applications where stored charge recovery speed matters for efficiency and EMI.

Forward drop and thermal headroom

That 10 W conduction loss at full rated current is manageable in the TO-220AC package, provided the junction temperature stays below the 175°C absolute maximum. Reverse leakage is 20 µA at 300 V, which is typical for a fast recovery diode in this voltage class. At elevated junction temperatures leakage doubles, so the 175°C max rating gives the thermal design margin for high-ambient or poorly-ventilated enclosures.

Frequently asked questions

What is the reverse recovery time of the STTH803D?

The STTH803D has a reverse recovery time of 35 ns, which qualifies it as a fast recovery diode (under 500 ns) per the classification. This speed suits it for switching applications where the diode must turn off quickly to limit reverse current spikes.