STMicroelectronics T1635H-6T

Overview

T1635H-6T from STMicroelectronics is a 16 A, 600 V snubberless triac in TO-220AB package, designed for mains AC switching in universal motor control and inrush current limiting. It delivers 35 mA gate trigger current (IGT), supports 150 °C junction operation, and features 1000 V/µs dV/dt immunity at 150 °C - enabling robust commutation in vacuum cleaners and coffee brewers.

For engineers reviewing the T1635H-6T datasheet, T1635H-6T pinout, T1635H-6T application, or T1635H-6T equivalent, key selection criteria include its 16 A RMS current rating, insulated thermal resistance (Rth(j-c) = 1.15 °C/W), high 3-quadrant commutation capability, and UL certification (E81734) for safety-critical appliance designs.

Technical Context

This triac operates without external snubbers due to intrinsic dV/dt immunity (≥1000 V/µs at Tj = 150 °C) and high critical rate of decrease of main current (≥21 A/ms). Its gate-trigger sensitivity (35 mA max) and low on-state voltage (1.5 V max at 23 A) support direct microcontroller drive with minimal buffer circuitry.

The device uses clip bonding for low thermal resistance and integrates an internal ceramic pad in insulated variants - though T1635H-6T is non-insulated TO-220AB, it shares the same die and thermal performance envelope as insulated versions, with case temperature derating defined up to 130 °C for 16 A RMS conduction.

Key Specifications

Pinout & Package

Package: TO-220AB - 3-pin through-hole package with metal tab (A2) electrically connected to MT2 terminal; standard lead spacing (2.54 mm), 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 BTB16-600CW, T1635H-6T offers higher dV/dt immunity and UL certification for safety-critical appliances; versus T1635H-6G, it trades SMT compatibility for through-hole mechanical robustness and simplified heatsinking in high-vibration environments.

Availability

T1635H-6T is available at Aetrix Electronics and suitable for vacuum cleaner motor control, coffee brewer heater switching, and inrush current limiting requiring stable component supply across industrial appliance production programs.

Supply support for T1635H-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, power, and microcontroller solutions for industrial, automotive, and consumer markets.

T1635H-6T belongs to ST's H-series snubberless triac product line, engineered specifically for high-reliability, high-power-density AC switching in universal motor and resistive load applications where thermal efficiency and safety certification are mandatory.

FAQ

Is T1635H-6T UL certified?

Yes, T1635H-6T is UL certified under file E81734, confirming compliance with UL 1557 for solid-state relays and AC switches. This certification covers dielectric strength, flammability, and construction requirements - essential for end-product safety approvals in North American household appliances.

What is the maximum case temperature for 16 A RMS operation?

The maximum case temperature for 16 A RMS operation is 130 °C, as specified in Table 1 (Absolute Maximum Ratings). Derating begins above this point: Figure 2 shows IT(RMS) drops to ~12 A at TC = 150 °C for TO-220AB packages.

Does T1635H-6T require a heatsink in all applications?

A heatsink is required for sustained 16 A RMS operation. With Rth(j-c) = 1.15 °C/W and typical power dissipation of ~2.4 W at 16 A, junction temperature rise exceeds safe limits without thermal management. For intermittent loads <5 A RMS, PCB copper area may suffice per Figure 3.

Can T1635H-6T replace T1635H-6I in a non-insulated design?

No - T1635H-6I uses TO-220AB Ins. with 2500 VRMS isolation; T1635H-6T has non-insulated TO-220AB. Substitution requires verifying whether the metal tab (A2) must be electrically isolated from chassis ground. If isolation is not needed, T1635H-6T provides identical electrical performance and lower thermal resistance.