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STMicroelectronics TYN408GRG — Discrete Semiconductors

STMicroelectronics TYN408GRG SCR, 400 V 8 A, TO-220-3

MPNTYN408GRG
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STMicroelectronics TYN408GRG standard-recovery SCR, 400 V off-state voltage, 8 A RMS on-state current, 80 A non-repetitive surge, TO-220-3 through-hole package, -40°C to 125°C operating temperature.

$1.5000Ref. price · indicative, final on quote
STMicroelectronics TYN408GRG datasheet (PDF)
PackagingTO-220-3
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

TYN408GRG specifications
ParameterValue
SCR typeStandard Recovery
MountingThrough Hole
Voltage - off state400 V
Voltage - on state (Vtm)1.6 V
Voltage - gate trigger (Vgt)1.5 V
Current - hold (Ih)45 mA
Current - off state5 µA
Current - gate trigger (Igt)25 mA
Current - on state (It (AV))5 A
Current - on state (It (RMS))8 A
Current - non rep. surge 50, 60Hz80A, 84A
Operating temperature-40°C ~ 125°C
PackageTube
CaseTO-220-3

Product details

400 V blocking, 8 A continuous — phase-control workhorse

The STMicroelectronics TYN408GRG is a standard-recovery SCR in a TO-220-3 through-hole package, rated for 400 V off-state voltage and 8 A RMS on-state current. It is designed for line-voltage phase-control applications such as motor speed controllers, heater regulators, and AC power switching where a simple, rugged thyristor is the right fit.

Surge margin and gate drive

Non-repetitive surge current is 80 A for 50 Hz and 84 A for 60 Hz half-cycle, giving headroom for capacitor inrush or motor start transients. Gate trigger current is 25 mA max and gate trigger voltage is 1.5 V max — compatible with standard optocoupler or pulse-transformer drive circuits without extra amplification.

The TO-220-3 package with a metal tab allows heatsink mounting for continuous 8 A RMS conduction; the tab is electrically common with the cathode.

ROHS3 compliant, no exemptions that would complicate EU or UKCA declarations.

Frequently asked questions

What is the TYN408GRG's surge current rating?

This covers typical inrush from motor starts or capacitive loads in phase-control circuits.

Can I replace TYN408GRG with a higher-current SCR?

A higher-current SCR in the same TO-220-3 package may be pin-compatible, but the gate trigger characteristics and holding current differ. The TYN408GRG has a 25 mA max gate trigger and 45 mA max holding current; a replacement must match these thresholds to avoid misfiring or failure to latch in the same drive circuit.