Diodes Incorporated T12M35T800HC

Overview

T12M35T800HC from Diodes Incorporated is a 12 A RMS, 800 V bidirectional thyristor (TRIAC) in ITO-220AB package, designed for AC phase-control switching in mains-powered resistive and inductive loads. It features 150°C junction operation, 18 A/ms commutating di/dt, three-quadrant triggering, and isolated mounting base for thermal management in heater and motor control circuits.

For engineers reviewing the T12M35T800HC datasheet, T12M35T800HC pinout, T12M35T800HC application, or T12M35T800HC equivalent, key selection criteria include blocking voltage (800 V), RMS current rating (12 A), gate trigger sensitivity (≤1 V / ≤35 mA), holding current (≤35 mA), and thermal resistance (4 °C/W junction-to-case).

Technical Context

This TRIAC operates in quadrants I and III with standard AC line synchronization and supports three-quadrant triggering to reduce false turn-on in noisy environments. Its low V_GT (≤1 V) and I_GT (≤35 mA) enable direct drive from microcontrollers or optocouplers without external amplification.

The device delivers robust commutation performance with di/dt(c) ≥18 A/ms and dv/dt(s) ≥500 V/μs at 150°C, while maintaining <2 mA off-state leakage at rated voltage and elevated temperature. Its isolated tab enables safe mechanical mounting to heatsinks without additional insulation.

Key Specifications

Pinout & Package

Package: ITO-220AB - Molded plastic housing with isolated copper tab (mounting base), matte tin-plated leads, UL 94V-0 rating, and 1.9 g mass. Designed for screw-mount heatsinking with electrical isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTB12-800CW and Q6012LH4, T12M35T800HC offers superior commutation immunity (18 A/ms), lower gate drive demand (≤35 mA), and integrated isolation-making it optimal for compact, high-reliability 400 V AC systems like EU household appliances.

Availability

T12M35T800HC is available at Aetrix Electronics and suitable for heater control, washing machine motor drives, vacuum cleaner power regulation, and rectifier-fed DC solenoid control requiring stable component supply across automotive-qualified production programs.

Supply support for T12M35T800HC 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The T12M35T800HC belongs to Diodes' high-reliability TRIAC product line, engineered specifically for robust AC phase-control in white goods, industrial controls, and automotive cabin systems requiring AEC-Q101 qualification readiness and IATF 16949 manufacturing compliance.

FAQ

What is the maximum allowable case temperature for continuous 12 A RMS operation?

The datasheet specifies that 12 A RMS operation is rated at T_C = 100°C. With R_th(j–c) = 4 °C/W, junction temperature reaches 148°C at this condition-within the 150°C absolute maximum. Derating is required above 100°C case temperature per Figure 7.

Does T12M35T800HC require a heatsink in all applications?

Yes-continuous 12 A RMS operation mandates a heatsink. At 100°C case temperature, power dissipation is ~2.25 W (from V_TM × I_T(RMS)). Without heatsinking, ambient derating limits usable current to under 2 A due to R_th(j–a) = 55 °C/W.

Can this TRIAC be used with zero-crossing optocouplers like MOC3041?

Yes-its low I_GT (≤35 mA) and V_GT (≤1 V) are fully compatible with MOC3041's 100 mA peak output. The device triggers reliably even at elevated temperatures, as confirmed by Figures 2 and 3 showing I_GT ≤ 50 mA and V_GT ≤ 1.1 V up to 150°C.

Is the ITO-220AB package lead-free and RoHS-compliant?

Yes-the "(LS)" suffix denotes lead-free finish, and the part meets EU RoHS 2011/65/EU and RoHS 3 2015/863/EU directives. The molded compound is halogen- and antimony-free, classified UL 94V-0, and terminals are matte tin-plated per MIL-STD-202.