STMicroelectronics T835H-8G-TR

Overview

T835H-8G from STMicroelectronics is an 8 A, 800 V snubberless triac in D²PAK package, designed for high-noise-immunity AC load switching at up to 150 °C junction temperature. It supports three-quadrant triggering and delivers robust dynamic commutation (dl/dt)_c ≥ 8 A/ms and static dV/dt ≥ 2000 V/µs at T_j = 150 °C, enabling reliable control of universal motors, heaters, and inductive loads in home appliances.

For engineers reviewing the T835H-8G datasheet, T835H-8G pinout, T835H-8G application, or T835H-8G equivalent, key selection criteria include verified 8 A RMS current rating at T_c = 139 °C, 900 V non-repetitive peak off-state voltage, gate trigger current ≤ 35 mA, thermal resistance R_th(j–c) ≤ 1.2 °C/W, and ECOPACK2-compliant D²PAK packaging for surface-mount thermal management.

Technical Context

This triac implements ST's high-temperature Snubberless technology, eliminating external snubbers in demanding inductive switching applications. Its three-quadrant gate triggering enables simplified drive circuitry while maintaining high noise immunity across full operating temperature range (−40 to +150 °C).

The device achieves stable turn-off under high di/dt stress via optimized semiconductor structure and gate design, with minimum critical commutation current rate (dl/dt)_c of 8 A/ms at 150 °C and on-state voltage as low as 0.83 V at T_j = 150 °C - directly supporting compact heatsink designs in space-constrained AC control modules.

Key Specifications

Pinout & Package

D²PAK (TO-263) package with isolated tab (A2), 3-pin surface-mount configuration. Tab is electrically connected to MT2 (A2) terminal and serves as primary thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB16-800BRG and Q6008LH4, the T835H-8G provides superior thermal performance in SMD form factor, higher dV/dt immunity for noisy environments, and validated snubberless operation at 150 °C - making it optimal for compact, high-reliability AC control in consumer appliances.

Availability

T835H-8G is available at Aetrix Electronics and suitable for universal motor control, smart AC plug design, and inrush current limiting applications requiring stable component supply and long-term industrial availability.

Supply support for T835H-8G 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.

The T835H-8G belongs to ST's STPOWER Triac family, engineered specifically for high-efficiency, snubberless AC power control in thermally constrained, cost-sensitive home appliance and industrial automation systems.

FAQ

What is the maximum case temperature for continuous 8 A RMS operation?

The T835H-8G sustains 8 A RMS current continuously at T_c = 139 °C, as specified in Absolute Maximum Ratings Table 1. Operation above this temperature requires derating per Figure 2 in DS13570, and thermal design must ensure R_th(c–a) remains below 20 °C/W at ambient to avoid junction exceedance.

Can the T835H-8G replace a standard 800 V triac in existing designs?

Yes - the T835H-8G is pin-compatible with industry-standard D²PAK triacs and offers enhanced specs: higher (dl/dt)_c (8 A/ms vs. typical 4–6 A/ms), improved dV/dt (2000 V/µs), and guaranteed snubberless operation up to 150 °C. No layout change is needed, but gate drive timing should be verified for quadrant-specific triggering.

Is a heatsink required for 8 A operation in free air?

No heatsink is sufficient for 8 A RMS in free air: Figure 3 shows IT(RMS) drops to ~0.8 A at Ta = 50 °C. For full 8 A, a low-thermal-resistance path to copper plane or heatsink is mandatory. With R_th(j–c) ≤ 1.2 °C/W and R_th(c–a) ≤ 10 °C/W, junction stays within 150 °C at Ta = 70 °C.

Does the D²PAK package provide electrical isolation between tab and PCB ground?

No - the D²PAK tab is internally connected to A2 (MT2) and is not electrically isolated. For isolation, use insulated mounting hardware or select a TO-220 insulated variant (e.g., T835H-800B-TR). The D²PAK version requires careful PCB layout to avoid unintended shorting of A2 to ground planes.