STMicroelectronics T2035T-8G-TR

Overview

T2035T-8G-TR from STMicroelectronics is a Snubberless™ Triac in D²PAK package, rated for 20 A RMS on-state current and 800 V repetitive peak off-state voltage, with 35 mA gate trigger current and 150 °C maximum junction temperature. It delivers high commutation robustness (dl/dt)_c ≥ 17.5 A/ms at 150 °C and static dV/dt ≥ 1000 V/µs, enabling reliable phase-angle and on/off AC switching in motor control and heating circuits without snubber networks.

For engineers reviewing the T2035T-8G-TR datasheet, T2035T-8G-TR pinout, T2035T-8G-TR application, or T2035T-8G-TR equivalent, key selection criteria include verified three-quadrant operation, non-insulated tab thermal performance (R_th(j-c) = 1.15 °C/W), 900 V non-repetitive surge rating, and RoHS/Halogen-Free Ecopack®2 compliance - all critical for industrial AC load switching under high-temperature, high-dI/dt conditions.

Technical Context

This triac operates across all three quadrants (I, II, III) with symmetrical triggering characteristics, supporting bidirectional AC conduction without polarity constraints. Its gate threshold voltage (V_GT) is ≤ 1.0 V at 25 °C, and it maintains stable latching (I_L ≤ 80 mA) and holding (I_H ≤ 45 mA) currents up to 150 °C junction temperature.

The device achieves high dynamic commutation capability via optimized silicon structure, delivering (dl/dt)_c ≥ 27.5 A/ms at 125 °C and ≥ 17.5 A/ms at 150 °C - enabling robust turn-off during fast current decay in inductive loads. Its on-state voltage (V_TM) is ≤ 1.50 V at 25 °C and ≤ 0.85 V at 150 °C, with dynamic resistance R_D ≤ 22 mΩ, minimizing conduction losses in high-power AC applications.

Key Specifications

Pinout & Package

The T2035T-8G-TR uses a D²PAK (TO-263) surface-mount package with non-insulated metal tab for direct heatsinking. Pin assignment is standardized per JEDEC MO-211: Anode 1 (A1), Anode 2 (A2), and Gate (G) are arranged in a 3-pin configuration with A2 and A1 on opposite sides of the tab.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB20-800CW and T2035H-8G-TR, the T2035T-8G-TR uniquely combines 800 V blocking at elevated temperature, snubberless operation, and SMD D²PAK packaging - making it optimal for space-constrained, high-reliability AC power control where thermal and EMI robustness are prioritized.

Availability

T2035T-8G-TR is available at Aetrix Electronics and suitable for motor control, heating management, inrush limiting, and overvoltage crowbar protection requiring stable component supply across industrial OEM production cycles.

Supply support for T2035T-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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The T2035T-8G-TR belongs to ST's Snubberless™ Triac product line, engineered specifically for high-commutation AC power switching in space-constrained, thermally demanding applications - emphasizing reliability, reduced external components, and simplified thermal design.

FAQ

Is the T2035T-8G-TR truly snubberless in all applications?

No - snubberless operation is guaranteed only when actual circuit conditions respect the device's specified (dl/dt)_c and dV/dt limits. In highly inductive loads or unfiltered mains with fast transients, a minimal RC snubber may still be required to ensure margin. The datasheet defines exact boundary conditions for snubber elimination in Section 1.1.

What is the thermal performance difference between insulated and non-insulated tab packages?

The non-insulated tab of the D²PAK package provides direct metal-to-heatsink contact, achieving R_th(j-c) = 1.15 °C/W - ~30–40% lower than insulated TO-220 equivalents. This allows 20 A operation at higher ambient temperatures or smaller heatsinks, but requires careful isolation of the heatsink from system ground if used in floating configurations.

Can the T2035T-8G-TR replace older triacs like the BTA20-800B in existing designs?

Yes, with layout adaptation: both are 20 A/800 V triacs, but T2035T-8G-TR uses D²PAK while BTA20-800B uses TO-220AB. Electrical compatibility is confirmed - same IGT (35 mA), VGT (≤1.0 V), and three-quadrant behavior - but thermal pad footprint and reflow profile must be updated for SMD assembly.

Does the "T" suffix in T2035T-8G-TR indicate a specific temperature grade?

Yes - the "T" denotes enhanced commutation performance: higher (dl/dt)_c and dV/dt ratings compared to standard "H" or "B" variants. Specifically, T2035T-8G-TR guarantees ≥17.5 A/ms (dl/dt)_c at 150 °C and ≥1000 V/µs dV/dt at 150 °C, whereas T2035H-8G-TR offers lower values optimized for cost-sensitive, lower-stress applications.