STMicroelectronics T1635H-6I

Overview

T1635H-6I from STMicroelectronics is a 16 A, 600 V snubberless triac in insulated TO-220AB package, designed for mains AC switching in high-power-density universal motor loads. It delivers 35 mA gate trigger current, supports 150 °C junction operation, and features 2500 VRMS isolation via internal ceramic pad - enabling direct heatsink mounting without additional insulation in vacuum cleaners and coffee brewers.

For engineers reviewing the T1635H-6I datasheet, T1635H-6I pinout, T1635H-6I application, or T1635H-6I equivalent, key selection criteria include its 1000 V/µs dV/dt immunity at 150 °C, 21 A/ms critical commutation di/dt, low 1.5 V on-state voltage at 23 A, and RoHS-compliant UL-certified (E81734) insulated packaging for safety-critical home appliance control.

Technical Context

This H-series triac operates in all three quadrants with no external snubber required, leveraging optimized gate structure and silicon design to sustain high commutation robustness up to 150 °C junction temperature. Its 2500 VRMS isolation rating and 2.1 °C/W junction-to-case thermal resistance enable compact, thermally efficient designs in space-constrained appliances.

The device uses a planar passivated chip with clip bonding for low thermal resistance and stable gate triggering across temperature. Its 35 mA max IGT and 1000 V/µs dV/dt (Tj = 150 °C) ensure reliable turn-on and noise immunity in noisy 50/60 Hz mains environments without false triggering.

Key Specifications

Pinout & Package

TO-220AB Insulated package with electrically isolated metal tab rated for 2500 VRMS. Mounting hole accepts M3 screw; recommended torque 0.4–0.6 N·m. Tab is electrically connected to MT2 terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB16-600CW and T1635H-6T, the T1635H-6I provides certified 2500 VRMS isolation in the same footprint - eliminating external insulation layers while maintaining identical thermal and switching performance for safety-critical home appliance designs.

Availability

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

Supply support for T1635H-6I 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.

The T1635H-6I belongs to ST's H-series snubberless triac product line, engineered specifically for high-reliability, high-power-density AC mains switching in safety-critical home appliances operating up to 150 °C junction temperature.

FAQ

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

The datasheet specifies 113 °C maximum case temperature (Tc) for continuous 16 A RMS operation in the TO-220AB insulated package. This limit derives from thermal derating curves and ensures junction temperature remains ≤150 °C under worst-case ambient and heatsink conditions. Exceeding 113 °C requires proportional current reduction per Figure 2 in DS5310 Rev 4.

Can T1635H-6I be used without a heatsink in low-duty-cycle applications?

No - even at low duty cycles, transient power dissipation during conduction can exceed 30 W, causing rapid junction temperature rise. The Rth(j-a) of 60 °C/W means >1000 °C junction rise above ambient without heatsinking. A minimum heatsink (≥10 cm² copper area) is mandatory for any sustained operation beyond brief pulses.

Does the 2500 VRMS isolation rating apply to DC or AC voltage?

The 2500 VRMS isolation rating is specified for sinusoidal AC voltage at 50/60 Hz, per UL certification file E81734. It does not imply equivalent DC withstand capability; DC testing would require separate validation. For DC isolation requirements, consult ST's safety application notes on reinforced insulation compliance.

Is gate resistor selection critical for reliable triggering?

Yes - a series gate resistor must limit peak gate current to ≤4 A (per IGM spec) while ensuring ≥35 mA reaches the gate under worst-case VCC and temperature. Typical values range from 100 Ω to 470 Ω depending on driver voltage and PCB trace inductance. Undersized resistors risk gate damage; oversized ones cause marginal triggering at low temperature.