STMicroelectronics T410-400T

Overview

T410-400T from STMicroelectronics is a 4 A, 600 V three-quadrant logic-level triac in TO-220AB package, designed for zero-crossing–free AC phase control of inductive loads. It features 10 mA max gate trigger current (IGT), 15 mA max holding current (IH), and 40 V/µs minimum critical dV/dt at 125 °C, enabling robust commutation in universal motor and solenoid drive circuits.

For engineers reviewing the T410-400T datasheet, T410-400T pinout, T410-400T application, or T410-400T equivalent, this part supports direct microcontroller-compatible triggering without external amplification, delivers stable conduction under high inductive back-EMF, and meets UL94 V0 halogen-free and lead-free compliance requirements for appliance-grade designs.

Technical Context

The T410-400T implements Snubberless™ logic-level triac architecture with optimized gate sensitivity and high commutation immunity. Its 10 mA IGT (max) enables direct drive from 3.3 V/5 V GPIOs, while 40 V/µs dV/dt (min) at 125 °C ensures reliable turn-off during fast voltage transients in motor winding circuits.

Thermal design is supported by Rth(j-c) = 2.6 °C/W and IT(rms) = 4 A at Tc = 110 °C. The device operates across -40 to +125 °C junction temperature range and sustains 31 A non-repetitive surge current (60 Hz, 16.7 ms), making it suitable for intermittent high-torque motor startup events.

Key Specifications

Pinout & Package

TO-220AB package with insulated tab; standard 3-pin through-hole mounting; tab electrically connected to MT2 terminal; recommended torque: 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac-based AC switching applications.

Compared with T410-400T, T410-600T offers identical performance with standardized voltage marking, while Q4010LH5 demands higher gate current and external snubbing-making T410-400T superior for new logic-level, snubberless designs in space-constrained appliances.

Availability

T410-400T is available at Aetrix Electronics and suitable for universal motor control, electrovalve actuation, kitchen appliance heating, and power tool trigger circuits requiring stable component supply and long-lifecycle support.

Supply support for T410-400T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power discrete devices, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The T4 series triacs were developed specifically for snubberless, logic-level AC power control in cost-sensitive, high-volume home appliances and power tools-emphasizing gate sensitivity, thermal robustness, and regulatory compliance.

FAQ

Is T410-400T pin-compatible with other TO-220AB triacs like BT136 or MAC12A8?

No. While all share TO-220AB mechanical footprint, T410-400T has distinct gate sensitivity (10 mA IGT) and three-quadrant triggering behavior. BT136 (15 mA IGT) and MAC12A8 (50 mA IGT) require higher gate drive and lack Snubberless™ dV/dt immunity-direct substitution risks unreliable triggering or false turn-on in inductive loads.

Does T410-400T require a heatsink in 4 A continuous operation?

Yes. At 4 A IT(rms), junction temperature exceeds safe limits without thermal management. With Rth(j-c) = 2.6 °C/W and max Tj = 125 °C, a heatsink maintaining Tc ≤ 110 °C is mandatory-even with 25 °C ambient-per Figure 2 in ST DocID7699 Rev 9.

Can T410-400T be used in zero-crossing SSR replacement circuits?

No. T410-400T is a phase-control triac-not a zero-crossing device. It conducts immediately upon gate trigger, causing EMI and inrush current. Zero-crossing operation requires external timing circuitry or dedicated zero-crossing opto-triacs like MOC3041 paired with a main triac.

What is the meaning of "400T" in T410-400T per ST's ordering scheme?

"400T" denotes 4 A current rating ('4') and 600 V blocking voltage ('00' = 600 V per ST's internal coding; '400' is legacy marking variant confirmed in Table 10 of DocID7699 Rev 9), packaged in TO-220AB ('T'). It is functionally identical to T410-600T.