STMicroelectronics T2035H-8I

Overview

T2035H-8I from STMicroelectronics is a 20 A, 800 V RMS-rated snubberless triac in insulated TO-220AB package, designed for high-noise AC line control in home appliances and industrial systems. It delivers 2.5 kV RMS insulation, 150 °C max junction temperature, and robust commutation (dl/dt)_c ≥20 A/ms at T_j = 150 °C - enabling compact heatsink designs in motor and heater drive circuits.

For engineers reviewing the T2035H-8I datasheet, T2035H-8I pinout, T2035H-8I application, or T2035H-8I equivalent, key selection criteria include its 2000 V/µs static dV/dt immunity at 150 °C, three-quadrant triggering capability, gate trigger current range of 5–35 mA, and UL1557-certified 2.5 kV isolation - critical for safety-compliant AC load switching in constrained thermal environments.

Technical Context

This triac implements ST's high-temperature snubberless architecture, eliminating external snubbers in resistive and inductive loads up to 800 V blocking. Its internal ceramic insulation pad enables 2.5 kV RMS isolation, while the TO-220AB insulated package provides direct mounting to grounded heatsinks without additional insulation hardware.

It supports full-wave AC phase control with three-quadrant triggering (I, II, III), delivering stable turn-on across wide temperature ranges (−40 to +150 °C). The device maintains ≥20 A/ms critical commutation current (dl/dt)_c and ≥2000 V/µs static dV/dt at maximum junction temperature - essential for reliable operation in high-noise motor drive and heater control applications.

Key Specifications

Pinout & Package

The T2035H-8I is housed in an insulated TO-220AB package with integral ceramic barrier between the metal tab and internal die. The metal tab is electrically isolated and rated for 2.5 kV RMS, permitting direct mounting to grounded heatsinks without insulating washers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB20-800CW and Q6025LH4, the T2035H-8I uniquely combines 800 V blocking, 2.5 kV isolation, and 20 A/ms commutation robustness - making it the only option qualified for globally rated, safety-critical, snubberless motor and heater control in compact industrial and appliance designs.

Availability

T2035H-8I is available at Aetrix Electronics and suitable for home appliance motor control, smart AC outlet switching, and industrial heater regulation requiring stable component supply and long-term lifecycle support.

Supply support for T2035H-8I 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 applications.

The T2035H-8I belongs to ST's high-temperature snubberless triac product line, engineered specifically for reliable, compact, and certification-ready AC load control in thermally demanding home appliance and industrial equipment.

FAQ

What is the maximum allowable case temperature for continuous 20 A RMS operation?

The T2035H-8I supports 20 A RMS continuous current only when case temperature (T_c) is maintained at ≤108 °C, as specified in Absolute Maximum Ratings. Exceeding this requires derating per Figure 2 in DS13132; at T_c = 125 °C, IT(RMS) drops to ~16 A. Thermal design must ensure heatsink interface resistance and ambient conditions sustain this limit.

Can the T2035H-8I be triggered using only quadrant I gate signals?

Yes - the device is fully functional in quadrant I (A2+, G+), but also supports quadrants II (A2−, G+) and III (A2−, G−), enabling flexible gate drive topologies. Quadrant III operation allows simplified negative-pulse triggering from microcontrollers with open-drain outputs, reducing external component count versus quadrant-I-only triacs.

Is external snubbing required for driving universal motors?

No - the T2035H-8I's (dl/dt)_c ≥20 A/ms at 150 °C and dV/dt ≥2000 V/µs eliminate the need for external RC snubbers in universal motor applications, provided layout minimizes stray inductance and gate drive rise time is controlled. This is validated per ST's snubberless application guidelines in AN437.

Does the 2.5 kV insulation rating apply to DC or AC voltage stress?

The 2.5 kV rating is specified as RMS AC voltage for 1 minute per UL1557, confirmed by ST's test report E81734. It is not rated for equivalent DC stress; for DC isolation requirements, consult ST's application note on insulation coordination and derate per IEC 60664-1, as DC partial discharge thresholds differ significantly from AC RMS withstand.