STMicroelectronics T1605G-6I

Overview

T1605G-6I from STMicroelectronics is a 16 A, 600 V RMS insulated triac in TO-220AB package, designed for phase-angle and on/off AC switching in LED dimmers, heating controls, and overvoltage crowbar protection. It features logic-level gate triggering (IGT ≤ 5 mA), ultra-low holding current (IH = 5 mA), and optimized commutation for flicker-free dimming of LED loads.

For engineers reviewing the T1605G-6I datasheet, T1605G-6I pinout, T1605G-6I application, or T1605G-6I equivalent, key selection criteria include its 600 V blocking voltage, 16 A RMS current rating, 2.1 °C/W junction-to-case thermal resistance, UL-recognized insulation (2500 VRMS), and three-quadrant operation with low IGT for microcontroller-compatible drive.

Technical Context

This triac operates across all three quadrants (I, II, III) with symmetrical gate trigger characteristics, enabling robust turn-on under both polarities of A2 relative to A1. Its 5 mA maximum gate trigger current and 5 mA holding current support direct interfacing with low-power logic outputs and deep-phase dimming without jitter.

The device delivers high commutation robustness via a minimum critical rate of rise of off-state voltage (dV/dt ≥ 10 V/µs at 125 °C) and critical rate of decrease of main current (dl/dt ≥ 2.5 A/ms), essential for reliable switching into inductive or capacitive lighting loads.

Key Specifications

Pinout & Package

TO-220AB insulated package with epoxy housing rated UL 94 V0, 2.3 g mass, and mechanical dimensions per DS13499 Rev 4 (A = 15.2–15.9 mm, B = 10.0–10.4 mm, e = 2.4–2.7 mm). Mounting torque: 0.55 N·m recommended, max 0.70 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT139-600E and MAC15A6YG, the T1605G-6I uniquely combines UL-recognized insulation, logic-level gate drive, and ultra-low holding current-enabling compact, certified, flicker-free dimmer designs without gate buffers or external isolation.

Availability

T1605G-6I is available at Aetrix Electronics and suitable for universal light dimmers, LED light dimmers, and heating control systems requiring stable component supply, long-term lifecycle assurance, and UL-compliant insulation.

Supply support for T1605G-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, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The T1605G-6I belongs to ST's "Light Dimmer Triacs" product line, engineered specifically for high-reliability, low-flicker AC phase-control in energy-efficient lighting and thermal regulation systems.

FAQ

What is the maximum junction temperature for continuous operation?

The T1605G-6I has an operating junction temperature range of –40 °C to +125 °C. For sustained 16 A RMS conduction, case temperature must be maintained ≤85 °C per absolute maximum ratings, requiring adequate heatsinking based on its 2.1 °C/W Rth(j-c) and ambient conditions.

Does this triac require a snubber circuit in LED dimmer applications?

A snubber is not mandatory due to the device's high dV/dt immunity (≥10 V/µs at 125 °C) and optimized commutation, but may still be recommended for EMI suppression or to protect against voltage spikes from highly reactive LED driver inputs-especially in non-zero-crossing dimming topologies.

Can the T1605G-6I replace non-insulated triacs in existing designs?

Yes, but only if the mechanical layout accommodates the TO-220AB insulated package's dimensions and mounting requirements. The insulated tab eliminates need for mica washers, but thermal interface material must still be applied, and PCB clearance to adjacent traces must respect 2500 VRMS creepage/clearance rules.

Is the T1605G-6I compliant with RoHS and halogen-free standards?

Yes-the device carries ECOPACK2 environmental compliance, meeting RoHS Directive 2011/65/EU and halogen-free requirements. Its epoxy housing also complies with UL 94 V0 flammability standard, confirmed in ST's official documentation (DS13499 Rev 4).