STMicroelectronics TD350ID

Overview

TD350ID from STMicroelectronics is an advanced high-side/low-side IGBT and power MOSFET gate driver in SO-14 package, featuring 1.5 A source / 2.3 A sink typical gate drive strength, active Miller clamp, two-step turn-off with adjustable delay and level, desaturation detection, and -10 V negative gate drive capability. It enables robust protection in 1200 V three-phase inverter stages for motor control and UPS systems.

For engineers reviewing the TD350ID datasheet, TD350ID pinout, TD350ID application, or TD350ID equivalent, key selection considerations include its dual-sink/source output architecture, programmable desat blanking via external capacitor, UVLO hysteresis of 1 V, and compatibility with both optocoupler and pulse transformer inputs.

Technical Context

The TD350ID implements a dedicated two-level turn-off function where gate voltage is reduced to a user-defined level (via LVOFF pin) after a programmable delay (set by COFF capacitor), mitigating overvoltage during short-circuit events while preserving RBSOA. Its internal 7.2 V desaturation comparator triggers fault response within 500 ns and supports external blanking timing.

Active Miller clamp activation at ~2 V gate-to-GND prevents false turn-on during high dV/dt switching; clamp output (CLAMP pin) delivers up to 500 mA sink current with VL+3 V max clamping voltage. Input logic is active-low, and separate OUTH/OUTL outputs allow independent gate charge/discharge paths without external diodes.

Key Specifications

Pinout & Package

TD350ID is housed in a 14-pin SOIC (SO-14) package with standard 1.27 mm pitch, ECOPACK®-compliant, and rated for 150°C maximum junction temperature. Thermal resistance is 125°C/W (junction-to-ambient) and 22°C/W (junction-to-case).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar IGBT gate driver applications.

Compared with IR2110PbF and UCC21520DW, TD350ID uniquely integrates desat detection with programmable blanking, active Miller clamp, and two-step turn-off in a single non-isolated SO-14 package-enabling high-reliability 1200 V inverter designs without external protection ICs or negative supply rails.

Availability

TD350ID is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies (UPS), renewable energy inverters, and electric vehicle onboard chargers requiring stable component supply and long-term production continuity.

Supply support for TD350ID 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 microcontrollers, power ICs, sensors, and automotive-grade components for industrial, consumer, and automotive markets.

TD350ID belongs to ST's high-voltage gate driver product line, engineered specifically for ruggedized 1200 V IGBT-based inverter systems demanding integrated protection, Miller immunity, and programmable fault response without external components.

FAQ

Can TD350ID drive both IGBTs and silicon MOSFETs?

Yes. TD350ID is explicitly qualified for both IGBTs and power MOSFETs, with gate drive strength (1.5 A source / 2.3 A sink) and voltage ranges (VH = 10–26 V, VL = 0 to –10 V) supporting common high-voltage discrete switches. Its desaturation detection is optimized for IGBT V_CE monitoring but can be adapted for MOSFET R_DS(on)-based overcurrent sensing using external circuitry.

What is the purpose of the CLAMP pin and how is it used?

The CLAMP pin (Pin 9) provides active Miller clamping by sinking up to 500 mA when the gate voltage falls below 2.0 V relative to GND. It connects directly to the IGBT gate through a low-inductance path and holds the gate near VL+3 V during high dV/dt turn-off, preventing false turn-on. The clamp automatically disables on the next IN falling edge.

How does the two-step turn-off function protect the IGBT during short-circuit conditions?

During desaturation, TD350ID first reduces gate voltage to a user-defined level (via LVOFF pin) after a programmable COFF delay, limiting IGBT current and slowing voltage rise. Then it fully turns off the device. This staged approach avoids dangerous V_CE overshoot and keeps operation within the IGBT's reverse-biased safe operating area (RBSOA), especially critical during hard short-circuits.

Is TD350ID still in active production or obsolete?

TD350ID is marked as "Obsolete Product(s)" in ST's official documentation (Doc ID 9525 Rev 6, April 2010). However, Aetrix Electronics maintains legacy inventory and offers full traceable sourcing, extended lifecycle support, and cross-reference assistance for drop-in replacements or redesign guidance for new designs.