STMicroelectronics T1635H-8G-TR

Overview

T1635H-8G-TR from STMicroelectronics is a 16 A, 800 V RMS-rated snubberless triac in D²PAK package, designed for high-noise-immunity AC load switching at up to 150 °C junction temperature. It supports three-quadrant triggering, delivers 2000 V/µs static dV/dt immunity at Tj = 150 °C, and enables compact thermal design in home appliance motor control and heater drive circuits.

For engineers reviewing the T1635H-8G-TR datasheet, T1635H-8G-TR pinout, T1635H-8G-TR application, or T1635H-8G-TR equivalent, key selection criteria include verified (dl/dt)c ≥ 16 A/ms at 150 °C, Rth(j-c) ≤ 1.1 °C/W, gate trigger current ≤ 35 mA, and ECOPACK2-compliant D²PAK packaging with UL94-V0 resin.

Technical Context

This triac implements ST's Snubberless high-temperature technology, enabling robust commutation without external snubbers across quadrants I, II, and III. Its 150 °C maximum junction temperature rating and 2000 V/µs dV/dt immunity at Tj = 150 °C allow direct integration into thermally constrained industrial and consumer AC control systems.

The device features a low on-state dynamic resistance of 23 mΩ at 150 °C and threshold voltage of 0.80 V, supporting efficient conduction in universal motor and resistive heating applications. Its 168 A non-repetitive surge rating (tp = 16.7 ms) and 169 A²s I²t fusing value provide validated overcurrent robustness under transient line conditions.

Key Specifications

Pinout & Package

D²PAK (TO-263) package with isolated tab (A2), standard 3-pin configuration: Pin 1 = MT1 (Main Terminal 1), Pin 2 = Gate, Pin 3 = MT2 (Main Terminal 2). Tab is electrically connected to MT2 and serves as primary thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB16-800CW, T1635H-8G-TR offers superior thermal management (1.1 vs 1.5 °C/W) and verified high-temperature commutation, while T1635H-8G provides identical performance in non-reel form-making the TR variant optimal for SMT volume manufacturing with thermal constraints.

Availability

T1635H-8G-TR is available at Aetrix Electronics and suitable for home automation smart plugs, universal motor drives, and resistive heater control requiring stable component supply and long-term industrial availability.

Supply support for T1635H-8G-TR 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

This part belongs to the STPOWER™ Triac family, engineered specifically for high-reliability, high-temperature AC power control in space-constrained appliances and industrial equipment.

FAQ

What is the maximum allowable case temperature for continuous 16 A operation?

The datasheet specifies IT(RMS) = 16 A at Tc = 131 °C (Figure 2). Operation above this case temperature requires linear derating; at Tc = 140 °C, maximum RMS current drops to ~13.5 A. Thermal design must ensure case temperature remains ≤131 °C under worst-case ambient and airflow conditions.

Does T1635H-8G-TR require a heat sink in free-air convection?

Yes. At Ta = 50 °C with free-air convection, maximum IT(RMS) is ~2.5 A (Figure 3). For 16 A operation, a heatsink with Rth(c-a) ≤ 10 °C/W is required-achievable with a 25 cm² copper pad (Figure 7) or small finned aluminum heatsink mounted to the D²PAK tab.

Can this triac replace a BT139-600 in an existing design?

No-BT139-600 is a 16 A/600 V triac in TO-220 package with lower voltage rating and no 150 °C or snubberless commutation specification. Substitution requires validation of 800 V blocking, 2000 V/µs dV/dt, and (dl/dt)c performance under actual load conditions.

Is the D²PAK tab electrically isolated from the leads?

No-the D²PAK tab is internally connected to MT2 (Pin 3) and is not electrically isolated. PCB layout must maintain clearance between the tab and other nets; thermal interface material must be electrically insulating if mounting to a grounded heatsink.