Diodes Incorporated T8M30T800HC

Overview

T8M30T800HC from Diodes Incorporated is an 8A RMS, 800V bidirectional thyristor (TRIAC) designed for AC power control in phase-angle and zero-crossing switching applications. It features three-quadrant triggering, 1.5V peak on-state voltage at ±8A, 30mA gate trigger current, and operates across –40°C to +150°C junction temperature. Used in solid-state relays, motor speed controllers, and lighting dimmers requiring robust 50/60Hz AC line commutation.

For engineers reviewing the T8M30T800HC datasheet, T8M30T800HC pinout, T8M30T800HC application, or T8M30T800HC equivalent, key selection criteria include blocking voltage rating (800V), RMS current capability (8A), gate sensitivity (30mA IGT), thermal resistance (17°C/W junction-to-case), and ITO-220AB package compatibility with heatsink mounting.

Technical Context

This TRIAC implements a three-quadrant triggering architecture-enabling reliable turn-on in Quadrants I and III only-reducing false triggering from noise in AC mains environments. Its passivated silicon die ensures stable VDRM/VRRM performance up to 800V and critical dv/dt immunity of 1000 V/μs at 125°C junction temperature.

The device supports full-cycle sine-wave conduction at 60Hz with IT(RMS) = 8A at TC = 95°C, and withstands non-repetitive surge currents up to 80A (8.3ms). Gate characteristics are specified with 12V anode-cathode bias and 100Ω load, yielding consistent latching (IL ≤ 45mA) and holding (IH ≤ 50mA) behavior over temperature.

Key Specifications

Pinout & Package

Package: ITO-220AB - Insulated plastic package with UL 94V-0 flammability rating, matte tin-plated leads, and integrated mounting hole (3.0–3.3mm Ø) for mechanical attachment and thermal transfer to heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Z0108MN800GTR and BTB16-800CW, the T8M30T800HC offers optimal balance of gate sensitivity (30mA), dv/dt immunity (1000 V/μs), and thermal efficiency (17°C/W) for noise-prone 8A industrial AC control-without over-engineering size or drive complexity.

Availability

T8M30T800HC is available at Aetrix Electronics and suitable for AC motor control, industrial dimming, solid-state relay design, and heating element regulation requiring stable component supply across extended production lifecycles.

Supply support for T8M30T800HC 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.

The T8M30T800HC belongs to Diodes' high-voltage TRIAC product line, engineered specifically for ruggedized AC power switching in harsh industrial environments where thermal stability, noise immunity, and long-term parameter consistency are critical.

FAQ

What is the maximum junction temperature and how does it affect thermal design?

The T8M30T800HC has a maximum junction temperature of +150°C. With a junction-to-case thermal resistance of 17°C/W, maintaining TJ ≤ 150°C at 8A RMS requires limiting case temperature to ≤95°C. This mandates use of a heatsink sized per actual power dissipation (calculated from V_TM × I_T(AVG)) and ambient conditions.

Can this TRIAC be used in zero-crossing switching applications?

Yes-though optimized for three-quadrant triggering, the T8M30T800HC supports zero-crossing operation when gated near voltage zero. Its low I_H (≤50mA) and stable V_GT (≤1V) ensure reliable turn-on even at low anode voltages, making it compatible with standard zero-crossing optocoupler drivers like MOC3041.

Is the ITO-220AB package electrically insulated, and what is the dielectric strength?

Yes-the ITO-220AB package provides electrical isolation between terminals and case. The dielectric strength is rated at 2500 VAC for one minute (RH < 30%), verified per industry-standard test methods. This enables safe mounting to grounded heatsinks without additional insulation hardware.

How does the 1000 V/μs dv/dt rating impact system-level EMI filtering requirements?

A 1000 V/μs dv/dt rating significantly reduces susceptibility to false triggering from fast transients, allowing simplified or eliminated snubber networks in many 50/60Hz applications. However, in environments with frequent lightning-induced surges or VFD coupling, a small RC snubber (e.g., 100Ω + 100nF) remains recommended to extend lifetime under extreme stress.