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STMicroelectronics ACS108-8SN-TR — Discrete Semiconductors

STMicroelectronics ACS108-8SN-TR TRIAC, 800 V, 800 mA

MPNACS108-8SN-TR
End of Life

STMicroelectronics ACS™/A.S.D® series, TRIAC Logic - Sensitive Gate, Single, 800 V Off State, 800 mA RMS On State, Surface Mount, TO-261-4, SOT-223.

$0.62Ref. price · indicative, final on quote
STMicroelectronics ACS108-8SN-TR datasheet (PDF)
PackagingTO-261-4, TO-261AA
RoHSROHS3 Compliant
SeriesACS™/A.S.D®
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ACS108-8SN-TR specifications
ParameterValue
SeriesACS™/A.S.D®
Triac typeLogic - Sensitive Gate
MountingSurface Mount
Voltage - off state800 V
Voltage - gate trigger (Vgt)1 V
Current - hold (Ih)10 mA
Current - gate trigger (Igt)10 mA
Current - on state (It (RMS))800 mA
Current - non rep. surge 50, 60Hz13A, 13.7A
Operating temperature-30°C ~ 125°C (TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ConfigurationSingle
CaseTO-261-4, TO-261AA

Product details

The STMicroelectronics ACS108-8SN-TR is a logic-level sensitive-gate TRIAC from the ACS™/A.S.D® series, rated for 800 V off-state voltage and 800 mA RMS on-state current. It is a single-configuration device in a surface-mount SOT-223 package (TO-261-4). The sensitive gate (10 mA max trigger current, 1 V max trigger voltage) lets a microcontroller or logic output drive it directly, eliminating the driver transistor and its associated BOM cost. Typical applications include small appliance controls, solid-state relays for fan or pump switching, and lighting dimmers or flashers where the load is under 800 mA. The operating junction temperature range of -30°C to 125°C covers most indoor and outdoor commercial/industrial environments.

The 800 V off-state voltage (Vdrm) provides headroom for mains switching. The 800 mA RMS on-state current (It(RMS)) is the continuous load limit.

SOT-223 package — rework and board-fit notes

The SOT-223 (TO-261-4) is a surface-mount package with a large tab for thermal dissipation. The tab is electrically connected to the MT2 terminal.

There is no last-time-buy or obsolescence notice.

Frequently asked questions

What is the equivalent of ACS108-8SN-TR?

The closest functional peer is the ACS108-6SA-TR, which is a through-hole version with a 600 V off-state rating. For a surface-mount 800 V alternative with higher current, consider the ACST610-8GTR (6 A rating). Neither is a direct pin-compatible second source.

Does ACS108-8SN-TR have an SOT-223 package?

Yes, the supplier device package is SOT-223 (TO-261-4). The tab is electrically connected to the MT2 terminal.

Does ACS108-8SN-TR require a snubber circuit?

The ACS108-8SN-TR is a logic-level sensitive-gate TRIAC. For inductive loads (motors, solenoids, transformers), a snubber (RC network) across the TRIAC is recommended to prevent false triggering from voltage transients. For purely resistive loads, a snubber is typically not required.

What is the typical application for ACS108-8SN-TR?

Typical applications include small appliance controls, solid-state relays for fan or pump switching, and lighting dimmers or flashers where the load is under 800 mA RMS.