STMicroelectronics T1620T-8G-TR

Overview

T1620T-8G-TR from STMicroelectronics is a snubberless, three-quadrant Triac in D²PAK package rated for 16 A RMS on-state current, 800 V repetitive peak off-state voltage (VDRM/VRRM), and 900 V non-repetitive surge voltage (VDSM/VRSM), with 20 mA gate trigger current (IGT) and 150 °C maximum junction temperature-used for phase-angle and on/off AC line switching in motor control and heating circuits.

For engineers reviewing the T1620T-8G-TR datasheet, T1620T-8G-TR pinout, T1620T-8G-TR application, or T1620T-8G-TR equivalent, key selection criteria include commutation robustness (dl/dt)c ≥ 4.5 A/ms at 150 °C, static dV/dt immunity ≥ 500 V/µs at 150 °C, thermal resistance Rth(j-c) ≤ 1.15 °C/W, and gate-trigger compatibility across all three quadrants without external snubbers.

Technical Context

This Triac employs a three-quadrant gate structure enabling triggering in Quadrants I, II, and III, with guaranteed VGT ≤ 1.3 V and IGT ≤ 20 mA at 25 °C. Its high (dl/dt)c (≥6 A/ms at 125 °C) and dV/dt (≥1000 V/µs at 125 °C) support reliable turn-off and false-trigger immunity in noisy, high-temperature AC environments.

The device operates up to 150 °C junction temperature with derated VDRM/VRRM = 600 V at that condition, and features low on-state characteristics: VTM ≤ 1.6 V at 22.6 A and 25 °C, VTO ≤ 0.85 V and RD ≤ 34 mΩ at 150 °C-enabling efficient conduction with minimal thermal rise in thermally constrained SMD layouts.

Key Specifications

Pinout & Package

The T1620T-8G-TR uses a surface-mount D²PAK (TO-263) package with non-insulated tab (A2), UL94-V0 flammability rating, and Ecopack2 compliance (RoHS + halogen-free). Thermal pad under tab requires copper area ≥2 cm² on FR4 for specified Rth(j-a) = 45 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB16-800CW and T1635T-8G-TR, the T1620T-8G-TR delivers optimal balance of low gate drive demand (20 mA), snubberless reliability at 150 °C, and high surge tolerance-making it preferred for cost-sensitive, thermally demanding AC control where microcontroller GPIO directly drives the gate.

Availability

T1620T-8G-TR is available at Aetrix Electronics and suitable for motor control, heating systems, and lighting dimming applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant SMD packaging.

Supply support for T1620T-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 analog, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

The T1620T-8G-TR belongs to ST's Snubberless™ Triac product line, engineered specifically for high-reliability, high-temperature AC power control in space-constrained SMD applications-emphasizing commutation robustness, thermal resilience, and simplified gate drive.

FAQ

Is the T1620T-8G-TR truly snubberless in all applications?

Yes-ST validates snubberless operation under defined conditions: (dl/dt)c ≥ 4.5 A/ms at 150 °C and dV/dt ≥ 500 V/µs at 150 °C. It eliminates snubbers in resistive and moderately inductive loads (e.g., heaters, universal motors) when layout minimizes stray inductance and gate drive meets IGT/IGM specs. Highly inductive loads may still require optimization.

What is the thermal pad connection requirement for the D²PAK package?

The A2 tab is electrically connected to Anode 2 and serves as the primary thermal path. It must be soldered to a ≥2 cm² copper pour on FR4 (35 µm thickness) to achieve the specified Rth(j-a) = 45 °C/W. No electrical isolation is provided-the heatsink or PCB plane must be at A2 potential.

Can the T1620T-8G-TR replace older 125 °C-rated Triacs in existing designs?

Yes-its 150 °C rating allows direct substitution where thermal margin is limiting, provided VDRM/VRRM remains ≥600 V at the new max junction temperature. Derating curves in Figure 2 confirm 16 A RMS is maintainable at Tc = 126 °C, matching legacy 125 °C parts' thermal envelope while offering extended safe operating area.

How does three-quadrant operation affect gate drive design?

Three-quadrant operation means the gate triggers only in QI (A2+, G+), QII (A2−, G+), and QIII (A2−, G−), excluding QIV. This allows unipolar gate drivers (e.g., microcontroller GPIO + resistor) instead of bipolar drivers needed for 4Q Triacs-reducing component count, cost, and board space while maintaining full AC half-cycle control.