Texas Instruments ISO5451DWR

Overview

ISO5451DWR from Texas Instruments is a reinforced isolated gate driver IC for IGBTs and MOSFETs, delivering 2.5-A peak source and 5-A peak sink output current, 76-ns typical propagation delay, 100-kV/μs typical CMTI, and integrated desaturation fault protection. It operates across –40°C to +125°C ambient and supports industrial motor drives, solar inverters, and EV power modules.

For engineers reviewing the ISO5451DWR datasheet, ISO5451DWR pinout, ISO5451DWR application, or ISO5451DWR equivalent, key selection criteria include its 5.7-kVRMS reinforced isolation rating, active Miller clamp capability, dual UVLO monitoring with RDY indication, and SOIC-16 package compatibility with high-voltage gate drive layouts.

Technical Context

The ISO5451DWR implements a galvanically isolated gate drive architecture with separate input (3–5.5 V) and output (15–30 V) supply domains, CMOS-compatible dual inputs (IN+, IN−), and internal desaturation sensing referenced to GND2. Its functional block includes an encoder/decoder across the isolation barrier, active pull-down logic, and fault latching via FLT/RST.

It features two independent undervoltage lockout circuits (UVLO1 on VCC1, UVLO2 on VCC2), a 2-A active Miller clamp output (CLAMP), short-circuit clamping at OUT, and leading-edge blanking (330–500 ns) to suppress false DESAT triggers during switching transients.

Key Specifications

Pinout & Package

ISO5451DWR is housed in a 16-pin SOIC (DW) package measuring 10.30 mm × 7.50 mm, with creepage/clearance >8 mm and reinforced insulation barrier.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8273BD and UCC5390SCD, ISO5451DWR uniquely integrates desaturation detection, active Miller clamping, and 5.7-kVRMS reinforced isolation - making it the only option among the three qualified for IGBT-based high-voltage industrial and automotive traction applications requiring full fault coverage in a single package.

Availability

ISO5451DWR is available at Aetrix Electronics and suitable for industrial motor drives, solar inverters, and EV power modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for safety-critical designs.

Supply support for ISO5451DWR 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and high-reliability power management solutions.

The ISO5451DWR belongs to TI's reinforced isolated gate driver product line, engineered specifically for high-voltage IGBT and MOSFET control in industrial, renewable energy, and electric vehicle power conversion systems.

FAQ

What is the maximum output supply voltage supported by the ISO5451DWR?

The ISO5451DWR supports a total output supply voltage (VCC2 – VEE2) up to 30 V, with VCC2 ranging from 15 V to 30 V and VEE2 from 0 V to –15 V. This allows flexible unipolar (e.g., 15 V/0 V) or bipolar (e.g., 15 V/–15 V) gate drive configurations. Absolute maximum ratings permit brief exposure to 35 V, but continuous operation must remain within the recommended 15–30 V range to ensure reliability and maintain safety certifications. The ISO5451DWR datasheet specifies these limits in Section 7.3.

How does the ISO5451DWR implement desaturation detection and fault response?

The ISO5451DWR monitors IGBT collector-emitter voltage via the DESAT pin using an external RC network. When voltage exceeds 9-V typical threshold (8.3–9.5 V), it triggers desaturation detection after 330–500 ns leading-edge blanking. The gate driver immediately pulls OUT low to VEE2, asserts FLT low, and latches the fault state until a low-active pulse ≥800 ns is applied to RST. This sequence ensures rapid IGBT shutdown and prevents reclosure until system diagnostics confirm safe restart. The ISO5451DWR integrates all logic and timing internally - no external components needed beyond the DESAT resistor and capacitor.

Does the ISO5451DWR require external components for Miller clamping?

No, the ISO5451DWR includes an integrated 2-A active Miller clamp at the CLAMP pin, eliminating the need for external diodes or transistors in unipolar-supply configurations. When enabled, CLAMP sinks current from the IGBT gate to VEE2 during high dv/dt transitions, preventing unintended turn-on. The clamp activates automatically during turn-off and remains active until the gate voltage falls below ~2.1 V. For bipolar supplies, the output is hard-clamped to VEE2 instead. This feature is fully implemented within the ISO5451DWR die and requires only proper PCB layout and VEE2 connection.

What safety certifications apply to the ISO5451DWR?

The ISO5451DWR holds multiple internationally recognized safety certifications: VDE-reinforced isolation per DIN V VDE V 0884-10 (8000-VPK VIOTM, 1420-VPK VIORM), UL 1577 (5700-VRMS for 1 minute), CSA Component Acceptance Notice 5A (IEC 60950-1 and IEC 60601-1), CQC GB4943.1-2011, and TUV EN 61010-1/EN 60950-1. These certifications validate its suitability for industrial, medical, and automotive end equipment where reinforced insulation and high surge withstand (10,000-VPK) are mandatory. All certifications are completed and documented in the ISO5451DWR datasheet Section 7.7.

Can the ISO5451DWR operate with a 3.3-V input supply?

Yes, the ISO5451DWR supports an input supply voltage (VCC1) from 3 V to 5.5 V, making 3.3-V operation fully compliant with its recommended operating conditions. At 3.3 V, the input UVLO1 thresholds are 2.25 V (rising) and 1.7 V (falling), providing adequate hysteresis. Logic inputs (IN+, IN−, RST) remain CMOS-compatible, and the RDY pin accurately reflects combined VCC1/VCC2 readiness. Quiescent current increases slightly versus 5-V operation, but thermal performance remains within spec across –40°C to +125°C. This 3.3-V capability enables direct interfacing with modern microcontrollers and FPGAs without level-shifting. The ISO5451DWR electrical characteristics table (Section 7.9) confirms operation at 3.3 V.