Skip to main content
Log in
STMicroelectronics T405-700B-TR — Discrete Semiconductors

STMicroelectronics T405-700B-TR TRIAC

MPNT405-700B-TR
End of Life

STMicroelectronics T405-700B-TR, Logic - Sensitive Gate TRIAC, Single, 700 V Off State, 4 A RMS On State, Surface Mount DPAK, -40°C to 125°C.

$1.29Ref. price · indicative, final on quote
STMicroelectronics T405-700B-TR datasheet (PDF)
PackagingTO-252-3, DPak (2 Leads + Tab), SC-63
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

T405-700B-TR specifications
ParameterValue
Triac typeLogic - Sensitive Gate
MountingSurface Mount
Voltage - off state700 V
Voltage - gate trigger (Vgt)1.3 V
Current - hold (Ih)10 mA
Current - gate trigger (Igt)5 mA
Current - on state (It (RMS))4 A
Current - non rep. surge 50, 60Hz30A, 31A
Operating temperature-40°C ~ 125°C (TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ConfigurationSingle
CaseTO-252-3, DPak (2 Leads + Tab), SC-63

Product details

Logic-level sensitive-gate TRIAC for 230 VAC loads

The STMicroelectronics T405-700B-TR is a single-channel logic-level sensitive-gate TRIAC rated for 700 V off-state voltage and 4 A RMS on-state current, housed in a surface-mount DPAK (TO-252) package. Its 5 mA maximum gate trigger current lets it switch directly from a microcontroller GPIO or optocoupler output without an intermediate driver transistor, simplifying the BOM on AC load-control boards.

Gate drive and hold current margins

Maximum gate trigger voltage is 1.3 V, so a logic output can drive it through a current-limiting resistor. The 10 mA maximum holding current means the TRIAC stays latched once triggered as long as the load current stays above that threshold.

Frequently asked questions

What is the equivalent part for T405-700B-TR?

The closest functional peer is the T405-600B, which shares the same 4 A RMS rating and DPAK footprint but is rated for 600 V off-state instead of 700 V. For a higher-current alternative, the ACST610-8GTR offers 6 A RMS at 800 V in a similar surface-mount package.