STMicroelectronics T435-600B-TR

Overview

T435-600B-TR from STMicroelectronics is a 4 A, 600 V snubberless three-quadrant triac in DPAK package, designed for AC inductive load switching with high commutation robustness and logic-level gate sensitivity (IGT ≤ 35 mA). It delivers 1.56 V on-state voltage at 5.5 A and supports motor control in power tools, dishwashers, and electrovalves.

For engineers reviewing the T435-600B-TR datasheet, T435-600B-TR pinout, T435-600B-TR application, or T435-600B-TR equivalent, key selection criteria include dV/dt immunity (400 V/µs), I²t rating (5.1 A²s), thermal resistance (70 °C/W junction-to-ambient), and snubberless operation for simplified PCB layout in universal motor drives.

Technical Context

The T435-600B-TR uses ST's Snubberless / logic-level triac architecture, enabling reliable triggering without external snubbers across quadrants I, II, and III. Its gate trigger current (IGT ≤ 35 mA) and high dV/dt immunity (400 V/µs at 125 °C) ensure stable turn-on under noisy AC line conditions.

Thermal performance is defined by Rth(j-c) = 2.6 °C/W and Rth(j-a) = 70 °C/W (DPAK, FR4, 0.5 cm² copper), supporting 4 A RMS conduction at Tc = 110 °C. Critical dI/dt capability reaches 50 A/µs with IG = 2×IGT, enabling fast-switching inductive loads.

Key Specifications

Pinout & Package

DPAK (TO-252) package: surface-mount, single-island tab, lead-free, halogen-free epoxy molding (UL94 V0). Tab is connected to MT2 terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with T435-600B-TR, the tube-packaged T435-600B offers identical performance at lower unit cost but lacks SMT automation support, while the IPAK-packaged T435-600H trades PCB area for improved thermal margin and mechanical stability in industrial installations.

Availability

T435-600B-TR is available at Aetrix Electronics and suitable for motor control circuits, electrovalve actuation, and small home appliance power management requiring stable component supply, full production lifecycle assurance, and RoHS-compliant sourcing.

Supply support for T435-600B-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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The T4 series triacs are part of ST's power discrete portfolio, engineered specifically for snubberless AC inductive load control in cost-sensitive, space-constrained applications like white goods and power tools.

FAQ

What is the maximum junction temperature for continuous operation?

The T435-600B-TR has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 125 °C requires derating IT(rms) per Figure 2 in the datasheet, with case temperature limited to 110 °C for full 4 A RMS rating. Thermal design must maintain Rth(j-a) ≤ 70 °C/W on FR4 with 0.5 cm² copper.

Can this triac replace a zero-crossing SSR in a heating control application?

No - the T435-600B-TR is a random-phase triac, not a zero-crossing solid-state relay. It lacks internal zero-crossing detection circuitry and will trigger immediately upon gate signal. For heater control requiring reduced EMI and inrush limiting, a dedicated zero-crossing SSR or opto-triac driver with external zero-crossing sensing is required.

Is a heatsink required for 4 A RMS operation?

A heatsink is not required for 4 A RMS operation at Tc ≤ 110 °C, as Rth(j-c) = 2.6 °C/W allows sufficient conduction cooling through the MT2-tab interface. However, for ambient-limited designs (e.g., sealed enclosures), a low-thermal-resistance pad or small clip-on heatsink improves margin, especially above 60 °C ambient.

Does the DPAK package support reflow soldering per JEDEC J-STD-020?

Yes - the T435-600B-TR DPAK package is qualified for standard lead-free reflow profiles (peak 260 °C, 20–40 sec above 217 °C), per ST's ECOPACK® specifications. The device's MSL level is 1 (unlimited floor life), and no pre-bake is required prior to soldering.