STMicroelectronics T835-600B-TR

Overview

T835-600B-TR from STMicroelectronics is a snubberless, logic-level triac rated for 8 A RMS on-state current and 600 V repetitive peak off-state voltage (VDRM/VRRM), with 35 mA maximum gate trigger current (IGT). It operates in three quadrants (I, II, III), supports phase control and zero-crossing switching, and is optimized for inductive load commutation in motor speed controllers and heating regulation circuits.

For engineers reviewing the T835-600B-TR datasheet, T835-600B-TR pinout, T835-600B-TR application, or T835-600B-TR equivalent, key selection criteria include its snubberless commutation capability (dV/dt = 400 V/µs min at 125 °C), low IGT enabling direct MCU interface, and IPAK package thermal resistance (Rth(j-c) = 1.6 °C/W).

Technical Context

This triac uses a three-quadrant triggering architecture that eliminates quadrant IV conduction, reducing false triggering in noisy environments. Its snubberless design achieves high commutation robustness via enhanced dV/dt immunity (400 V/µs) and critical rate of decrease of main current (dl/dt)c ≥ 3.5 A/ms at 125 °C.

The device features a low threshold on-state voltage (VTO ≤ 0.85 V at 125 °C) and dynamic resistance (RD ≤ 50 mΩ), enabling efficient power handling with minimal conduction loss. Gate sensitivity is specified at 35 mA max IGT with 1.2 V max VGT, supporting direct drive from 3.3 V/5 V microcontrollers without external amplification.

Key Specifications

Pinout & Package

Package: IPAK (TO-251AA), surface-mount, lead-free, halogen-free epoxy, UL94 V0 rated. Tab is electrically connected to MT2 (A2) terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with T835-600B-TR, T835-600G offers superior ambient thermal performance in free-air but demands more PCB area, while BTA08-600CW provides certified insulation and chassis-mount flexibility at the cost of higher thermal resistance and assembly complexity.

Availability

T835-600B-TR is available at Aetrix Electronics and suitable for motor speed control, heating regulation, light dimming, and static relay replacement requiring stable component supply and SMT manufacturability.

Supply support for T835-600B-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 T8 series belongs to ST's high-reliability snubberless triac product line, engineered specifically for robust AC power control in inductive and resistive loads without external protection components.

FAQ

What is the maximum junction temperature for continuous operation?

The T835-600B-TR has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 8 A RMS requires maintaining case temperature ≤ 110 °C per absolute maximum ratings, corresponding to a maximum allowable junction-to-case temperature rise of 15 °C under full load.

Does this triac require a heatsink in typical applications?

Yes - at 8 A RMS, power dissipation exceeds 2 W (based on VTO = 0.85 V and RD = 50 mΩ). With Rth(j-c) = 1.6 °C/W, a heatsink or thermally enhanced PCB copper area is required to limit junction temperature to ≤125 °C; minimum recommended copper area is 10 cm² on 35 µm FR4.

Can T835-600B-TR replace a standard four-quadrant triac in existing designs?

No - it operates only in quadrants I, II, and III. If the original design relies on quadrant IV triggering (e.g., certain zero-crossing driver ICs or legacy phase-control circuits), substitution may cause failure to trigger. Verify gate drive polarity and conduction quadrant requirements before replacement.

Is the IPAK package lead-free and RoHS-compliant?

Yes - the T835-600B-TR IPAK package uses lead-free plating and halogen-free molding compound compliant with RoHS Directive 2011/65/EU and ECOPACK2 environmental standards, as confirmed in STMicroelectronics' official documentation (DS2114 Rev 16).