STMicroelectronics T810T-8FP

Overview

T810T-8FP from STMicroelectronics is an 8 A, 800 V RMS logic-level triac in an insulated TO-220FPAB package, designed for AC line switching with three-quadrant operation, 10 mA gate trigger current, and 2000 VRMS reinforced insulation. It enables direct microcontroller drive in motor control, lighting dimming, and overvoltage crowbar protection circuits.

For engineers reviewing the T810T-8FP datasheet, T810T-8FP pinout, T810T-8FP application, or T810T-8FP equivalent, key selection criteria include dV/dt immunity (≥250 V/µs at 125 °C), dI/dt rating (100 A/µs), junction-to-case thermal resistance (3.8 °C/W), and UL-certified insulation compliance.

Technical Context

The T810T-8FP is a three-quadrant logic-level triac optimized for high-reliability AC switching where gate drive simplicity and transient robustness are critical. Its design supports phase-angle control and zero-crossing on/off switching in mains-connected loads.

It features high dV/dt immunity (250 V/µs min at Tj = 125 °C) and high dI/dt capability (100 A/µs), enabling stable triggering under noisy line conditions without snubbers in many applications. The insulated TO-220FPAB package provides 2000 VRMS isolation between main terminals and heatsink mounting surface.

Key Specifications

Pinout & Package

Package: TO-220FPAB - Insulated through-hole package with electrically isolated tab (2000 VRMS), epoxy meeting UL94 V0, lead-free, and recommended mounting torque of 0.4–0.6 N·m.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT139-800R and Q6008LH4, the T810T-8FP uniquely combines 800 V blocking, 2000 VRMS insulation, and 10 mA gate sensitivity-enabling compact, certified, microcontroller-driven AC control without external isolation or buffering.

Availability

T810T-8FP is available at Aetrix Electronics and suitable for motor control, lighting dimming, and overvoltage crowbar protection requiring stable component supply and long-term industrial availability.

Supply support for T810T-8FP 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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The T810T-8FP belongs to ST's high-reliability logic-level triac family, engineered specifically for robust AC mains interfacing in safety-critical and thermally constrained applications.

FAQ

Is the T810T-8FP suitable for zero-crossing switching?

Yes. The T810T-8FP supports zero-crossing operation due to its three-quadrant structure and low IGT (≤10 mA), enabling precise synchronization with AC line zero crossings via microcontroller timing. Its dV/dt immunity ensures reliable non-triggering during voltage transitions, making it ideal for noise-immune on/off control without phase-angle complexity.

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

The datasheet specifies IT(rms) = 8 A at Tc = 113 °C. Exceeding this case temperature requires derating per Figure 2; at 100 °C case temperature, maximum sustainable IT(rms) is approximately 8.5 A, while at 125 °C it drops to ~7.2 A. Thermal design must maintain Tc ≤ 113 °C under full load using appropriate heatsinking and airflow.

Does the TO-220FPAB package require thermal compound when mounted to a heatsink?

Yes. Although the TO-220FPAB tab is electrically insulated, thermal interface material (e.g., silicone grease or phase-change pad) is required between the tab and heatsink to minimize thermal resistance. The Rth(j-c) value of 3.8 °C/W assumes optimal mounting pressure (0.4–0.6 N·m) and proper thermal interface - omitting compound increases effective Rth and risks thermal runaway.

Can the T810T-8FP replace a standard 4Q triac in existing designs?

No - it is a three-quadrant (3Q) triac and cannot conduct in Quadrant IV. Replacing a 4Q triac may cause failure to trigger under certain voltage/current polarity combinations, especially in highly capacitive or reactive loads. Design verification is mandatory; use only where 3Q operation is confirmed compatible with the gate drive waveform and load characteristics.