STMicroelectronics DEMOTD350

Overview

TD350 from STMicroelectronics is an advanced IGBT and power MOSFET gate driver IC featuring 1.5 A source / 2.3 A sink typical gate drive capability, active Miller clamp, two-step turn-off with adjustable level and delay, desaturation detection, and fault status output. It operates across -40°C to +125°C, supports ±10 V gate drive (VH = 16 V, VL = -10 V), and is used in 1200 V three-phase inverters for motor control and UPS systems.

For engineers reviewing the TD350 datasheet, TD350 pinout, TD350 application, or TD350 equivalent, key selection considerations include its dual-sink/source outputs for independent gate control, programmable two-level turn-off timing, integrated desat protection with 7.2 V threshold, and compatibility with optocouplers or pulse transformers in high-reliability industrial power stages.

Technical Context

The TD350 implements a dedicated analog control block with separate high-side (OUTH) and low-side (OUTL) gate drive outputs, enabling precise charge/discharge path separation without external diodes. Its active Miller clamp activates at 2.0 V gate voltage (relative to GND) and clamps to VL+3.0 V max under 500 mA Miller current.

Two-level turn-off uses external COFF capacitor and LVOFF voltage to set delay (Ta) and off-level; same delay applies at turn-on to prevent pulse width distortion. Desaturation detection triggers at 7.2 V on DESAT pin with internal blanking via 250 µA current source and external capacitor.

Key Specifications

Pinout & Package

TD350 is housed in a SO-14 surface-mount package with standard 1.27 mm pitch, ECOPACK®-compliant lead-free finish, and thermal resistance R_thJA = 125 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2110S and UCC27324, TD350 uniquely integrates desat detection, active Miller clamp, and two-step turn-off in a single SO-14 package-enabling compact, high-reliability 1200 V IGBT control without external protection components or negative bias supplies.

Availability

TD350 is available at Aetrix Electronics and suitable for industrial motor drives, uninterruptible power supplies (UPS), solar inverters, and industrial welding equipment requiring stable component supply and long-term lifecycle support.

Supply support for TD350 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.

TD350 belongs to ST's high-voltage gate driver product line, engineered specifically for robust IGBT and MOSFET control in industrial inverters, UPS, and motor drives demanding integrated protection and high-temperature operation.

FAQ

What is the purpose of the CLAMP pin on TD350?

The CLAMP pin provides active Miller current control during high dV/dt switching events. When the gate voltage drops below 2.0 V relative to GND, CLAMP activates and sinks up to 500 mA to hold the gate near VL+3.0 V, preventing false turn-on without requiring a negative supply rail. This function is automatically disabled upon next IN signal activation.

How does the two-step turn-off feature protect the IGBT?

During overcurrent or short-circuit, the two-step turn-off first reduces gate voltage to a user-defined level (via LVOFF) after a programmable delay (set by COFF), limiting di/dt and collector voltage rise. Then it fully turns off the device, reducing both overvoltage stress and RBSOA violation risk. The same delay applies at turn-on to avoid pulse width distortion.

Can TD350 drive both IGBTs and MOSFETs?

Yes-TD350 is explicitly qualified for both IGBTs and power MOSFETs. Its 1.5 A source / 2.3 A sink drive strength, ±10 V gate swing capability (VH=16 V, VL=–10 V), and desaturation detection (optimized for IGBT V_CE) make it suitable for high-voltage IGBTs, while its fast propagation delays (<650 ns) and Miller clamp also benefit high-speed Si/SiC MOSFETs in hard-switched topologies.

Is TD350 still in active production?

TD350 is marked "Obsolete Product(s)" in its official STMicroelectronics documentation (Doc ID 9525 Rev 6, April 2010). However, Aetrix Electronics maintains legacy inventory and offers extended supply support-including traceable lots, engineering documentation, and lifecycle coordination-for industrial customers continuing to use this mature, field-proven gate driver in existing designs.