STMicroelectronics T410H-6T

Overview

T410H-6T from STMicroelectronics is a high-temperature, logic-level sensitive 4 A TRIAC in TO-220AB package, rated for 600 V repetitive peak off-state voltage (VDRM/VRRM), with gate trigger current ≤10 mA and maximum junction temperature of 150 °C. It enables microcontroller-driven AC load control in space-constrained appliance and industrial systems requiring robust thermal performance.

For engineers reviewing the T410H-6T datasheet, T410H-6T pinout, T410H-6T application, or T410H-6T equivalent, key selection criteria include its low IGT (≤10 mA), high dV/dt immunity (75 V/µs at Tj = 150 °C), commutation capability up to 150 °C, and TO-220AB thermal resistance (Rth(j-c) = 2.20 °C/W).

Technical Context

The T410H-6T is a bidirectional thyristor designed for full-cycle AC phase control, operating in all four quadrants (I–III) with symmetrical triggering characteristics. Its logic-level sensitivity allows direct drive from MCU GPIO pins without external amplification.

It features enhanced thermal robustness: specified for continuous operation up to 150 °C junction temperature, with validated commutation stability and noise immunity maintained across that range. The device uses ST's proprietary high-temperature silicon process and clip-bonding construction to reduce on-state losses (VT ≤1.5 V at 5.6 A) and improve thermal dissipation.

Key Specifications

Pinout & Package

Package: TO-220AB - Insulated case, single-ended mounting, 2.3 g weight, UL94 V0 epoxy, 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 BT138-600D and MAC12A6, the T410H-6T uniquely guarantees full electrical specification compliance-including commutation, dV/dt, and IGT-up to 150 °C, making it the only choice for thermally demanding, long-life AC control in sealed appliances and industrial cabinets.

Availability

T410H-6T is available at Aetrix Electronics and suitable for washing machine motor control, HVAC fan regulation, commercial oven heating, and smart power outlet modules requiring stable component supply and long-term manufacturability.

Supply support for T410H-6T 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, designing and manufacturing analog, digital, and mixed-signal ICs, discrete devices, and MEMS sensors for industrial, automotive, and consumer markets.

The T410H-6T belongs to ST's high-temperature TRIAC product line, engineered specifically for solid-state replacement of relays and contactors in thermally constrained AC power control applications where reliability at elevated junction temperatures is critical.

FAQ

What is the maximum allowable gate resistor value for direct MCU drive?

The T410H-6T requires ≤10 mA IGT at 25 °C and ≤15 mA at 150 °C. With a 3.3 V MCU GPIO, a 330 Ω series resistor limits gate current to ~10 mA, satisfying worst-case trigger margin. Lower resistance (e.g., 220 Ω) is recommended for guaranteed turn-on across temperature and voltage tolerances.

Does T410H-6T require a snubber circuit in resistive load applications?

A snubber is not required for purely resistive loads (e.g., heaters) due to low dI/dt and absence of inductive kickback. However, ST recommends an RC snubber (e.g., 100 Ω + 100 nF) for inductive or mixed loads to suppress dV/dt transients and prevent false triggering, especially at high ambient temperatures.

Can T410H-6T be used in zero-crossing switch configurations?

Yes - the T410H-6T supports zero-crossing operation when triggered near voltage zero using synchronized gate pulses. Its low IGT and high dV/dt immunity ensure reliable turn-on at zero-crossing points without premature firing, enabling low-EMI, low-noise AC switching in lighting and heating controls.

What is the minimum heatsink thermal resistance needed for continuous 4 A operation at 40 °C ambient?

At 4 A IT(RMS), power dissipation is ~3.2 W (using VT ≈ 0.8 V at high Tj). With Rth(j-c) = 2.20 °C/W and max Tj = 150 °C, allowable case-to-ambient rise is 110 °C. Thus, Rth(c-a) ≤ 110/3.2 ≈ 34 °C/W. A standard 25–30 °C/W extruded aluminum heatsink suffices for continuous operation.