STMicroelectronics T5035H-8PI

Overview

T5035H-8PI from STMicroelectronics is a 50 A RMS, 800 V snubberless triac in TOP3 insulated package, designed for high-noise-immunity AC load switching in home appliances and industrial controls. It operates up to 150 °C junction temperature, supports three triggering quadrants, and delivers 2.5 kV RMS insulation with UL94-V0 molding resin. Used in smart AC plugs and motor-driven heaters.

For engineers reviewing the T5035H-8PI datasheet, T5035H-8PI pinout, T5035H-8PI application, or T5035H-8PI equivalent, key selection criteria include dV/dt immunity (≥2000 V/µs at Tj = 150 °C), commutation robustness (dl/dt)c ≥ 40 A/ms, thermal resistance Rth(j-c) = 0.87 °C/W, and gate trigger current IGT ≤ 35 mA across quadrants I–III.

Technical Context

This triac implements ST's high-temperature snubberless architecture optimized for inductive load commutation without external snubbers. Its internal ceramic isolation pad enables 2.5 kV RMS reinforced insulation, while the TOP3 package integrates creepage/clearance compliance per UL1557.

The device sustains repetitive 800 V blocking (VDRM/VRRM) and non-repetitive 900 V peaks (VDSM/VRSM), with static dV/dt immunity degrading only modestly above 100 °C-maintaining ≥1200 V/µs at 150 °C per Figure 7. Gate sensitivity remains stable across quadrants I, II, and III, with IGT ≤ 35 mA at 25 °C and ≤ 75 mA at 150 °C.

Key Specifications

Pinout & Package

Package: TOP3 Insulated - molded plastic housing with internal ceramic isolation barrier, UL94-V0 rated, 2.5 kV RMS insulation, lead-free plating, and 4.5 g mass. Dimensions per DS13818 Rev 3 Table 5: G = 20.4–21.1 mm length, F = 15.8–16.5 mm width, C = 14.35–15.60 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB24-800CW and T5035H-8TR, the T5035H-8PI uniquely integrates reinforced 2.5 kV insulation and 150 °C operation in one package-enabling smaller, safer, and thermally resilient AC control stages without redesigning isolation architecture.

Availability

T5035H-8PI is available at Aetrix Electronics and suitable for smart home automation, industrial heater control, and universal motor drive applications requiring stable component supply and long-term lifecycle support.

Supply support for T5035H-8PI 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 T5035H-8PI belongs to ST's high-temperature snubberless triac product line, engineered specifically for compact, reliable AC load control in thermally demanding and safety-critical home and industrial appliances.

FAQ

What is the maximum allowable case temperature for continuous 50 A RMS operation?

The datasheet specifies IT(RMS) = 50 A at Tc = 97 °C (Figure 2). Exceeding this case temperature reduces safe RMS current linearly; at Tc = 105 °C, derated current drops to ~47 A. Thermal design must ensure heatsink-to-case interface resistance keeps Tc ≤ 97 °C under worst-case ambient and airflow conditions.

Does the T5035H-8PI require a heat sink in all applications?

Yes-continuous 50 A operation demands a heatsink. With Rth(j-c) = 0.87 °C/W and max Tj = 150 °C, even at Ta = 40 °C, junction temperature exceeds limit without heatsinking. Figure 14 recommends ≤15 °C/W heatsink thermal resistance for 800 V blocking at 100 °C ambient; free-air convection (Rth(j-a) ≈ 50 °C/W) supports only ~1.5 A RMS.

Can this triac be triggered using a microcontroller GPIO directly?

No-IGT ≤ 35 mA at 25 °C requires gate drive exceeding typical GPIO current limits (usually ≤20 mA). A dedicated gate driver (e.g., MOC302x optocoupler or discrete transistor stage) is required to deliver compliant pulse energy while maintaining isolation and noise immunity.

How does the TOP3 insulated package differ from standard TO-220 in safety compliance?

The TOP3 insulated package incorporates an internal ceramic barrier providing 2.5 kV RMS reinforced insulation between main terminals and mounting surface-certified per UL1557. Standard TO-220 lacks this barrier; achieving equivalent isolation requires external insulation kits, larger creepage distances, and additional safety testing, increasing cost and board space.