Infineon Technologies IRS4427STRPBF

Overview

IRS4427STRPBF from Infineon Technologies (formerly International Rectifier) is a dual low-side gate driver IC designed to drive power MOSFETs and IGBTs in high-speed switching applications. It features CMOS Schmitt-triggered inputs, 3.3 V/5 V logic compatibility, matched 50 ns propagation delays per channel, ±2.3 A / +3.3 A peak output current capability, and operates from a 6–20 V gate supply. It is commonly used in DC-DC converters where precise timing and robust drive strength are required.

For engineers reviewing the IRS4427STRPBF datasheet, IRS4427STRPBF pinout, IRS4427STRPBF application, or IRS4427STRPBF equivalent, key selection criteria include input logic polarity configuration (inverting for IRS4427), dual-channel delay matching, SOIC-8 thermal performance (R_thJA = 200 °C/W), and pulsed short-circuit output current ratings under defined V_O conditions.

Technical Context

The IRS4427STRPBF implements two independent low-side drivers with inverting logic inputs - INA drives OUTA low when high, INB drives OUTB low when high. Its proprietary latch-immune CMOS process ensures robust operation in noisy industrial environments.

Each channel delivers asymmetric peak current: +2.3 A source (IO+) and –3.3 A sink (IO–) into capacitive loads, with rise/fall times of 25–55 ns and propagation delays tightly matched at 50 ns typical. The device requires no external bootstrap components and references all signals to COM.

Key Specifications

Pinout & Package

IRS4427STRPBF is housed in a standard SOIC-8 (SOIC8N) package with exposed pad not electrically connected. Thermal performance assumes board-mounted, still-air conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-side driver applications.

Compared with IRS4426STRPBF, IRS4427STRPBF offers inverted logic for direct compatibility with active-low PWM controllers; versus LM5113SD/NOPB, it lacks high-voltage tolerance and level-shifting but delivers lower cost, simpler layout, and true dual-channel symmetry for low-side-only systems.

Availability

IRS4427STRPBF is available at Aetrix Electronics and suitable for DC-DC converters, motor drive stages, PLC output modules, and LED drivers requiring stable component supply, industrial-grade reliability, and SOIC-8 manufacturability.

Supply support for IRS4427STRPBF 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

Infineon Technologies acquired International Rectifier in 2015 and continues its legacy of high-performance power semiconductors and driver ICs for industrial, automotive, and computing markets.

The IRS44xx family was developed specifically for ruggedized, high-speed gate driving in industrial power conversion - emphasizing latch immunity, ESD robustness, and precise dual-channel timing alignment.

FAQ

What logic polarity does IRS4427STRPBF implement?

IRS4427STRPBF uses inverting logic: a logic-high input (INA or INB) forces the corresponding output (OUTA or OUTB) low. This matches common PWM controller outputs that assert active-low gate drive signals. Input thresholds are VIH ≥ 2.5 V and VIL ≤ 0.8 V at VCC = 15 V, with Schmitt-trigger hysteresis for noise rejection.

Can IRS4427STRPBF drive both high-side and low-side FETs?

No - IRS4427STRPBF is a dedicated low-side driver only. Its outputs and inputs are all referenced to COM (power ground), so it cannot float to drive high-side N-channel FETs. For high-side drive, a separate bootstrap or isolated driver (e.g., IRS21844) is required. It is optimized for low-side switching in buck, half-bridge, and synchronous rectifier configurations.

What is the maximum allowable V_CC supply voltage?

The absolute maximum V_CC rating is 25 V, but the recommended operating range is 6 V to 20 V per the datasheet. Operation above 20 V risks exceeding safe operating area limits under transient load conditions and may degrade long-term reliability. Designers should maintain V_CC within 6–20 V and use a local 100 nF ceramic decoupling capacitor at the V_CC pin.

Is IRS4427STRPBF pin-compatible with IRS4426STRPBF or IRS4428STRPBF?

Yes - all three variants (IRS4426/4427/4428) share identical SOIC-8 pinouts and electrical specifications except for input logic mapping. IRS4426 is non-inverting, IRS4427 is inverting, and IRS4428 has one inverting and one non-inverting input. PCB layout and passive components can be reused across the family; only firmware or upstream logic may require adjustment.