Infineon Technologies IRS2181PBF

Overview

IRS2181PBF from Infineon Technologies is a high-voltage, high-speed dual-channel gate driver IC for N-channel MOSFETs and IGBTs, featuring independent high-side (HO) and low-side (LO) outputs with 600 V floating capability, 180 ns typical turn-on propagation delay, 1.4 A/1.8 A source/sink current, and 3.3 V/5 V logic-compatible inputs. It enables half-bridge motor control in industrial inverters.

For engineers reviewing the IRS2181PBF datasheet, IRS2181PBF pinout, IRS2181PBF application, or IRS2181PBF equivalent, key selection criteria include bootstrap-compatible high-side operation up to +600 V, matched propagation delays between channels, undervoltage lockout on both VCC and VB supplies, and ±5 V logic/power ground offset tolerance.

Technical Context

The IRS2181PBF integrates proprietary HVIC technology to support robust high-side floating operation with dV/dt immunity up to 50 V/ns and negative transient tolerance on VS. Its internal level-shifting architecture enables reliable signal transmission across the high-side isolation barrier without external components.

It implements independent UVLO thresholds (8.9 V typical enable, 8.2 V typical disable) for both VCC and VB supplies, with 0.7 V hysteresis, and uses pulse filtering plus latch-immune CMOS logic to prevent false triggering under noise. The HO/LO outputs are cross-conduction protected via matched delay paths and non-overlapping drive logic.

Key Specifications

Pinout & Package

IRS2181PBF is housed in an 8-lead PDIP package with creepage/clearance optimized for 600 V isolation. Pin assignments are validated per IRF datasheet PD60262 and confirmed on Infineon's official product page.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IRS2181PBF, IRS2184PBF adds functional safety features at the cost of slower switching and larger footprint, while FAN7382MX reduces drive capability and timing precision-making IRS2181PBF optimal for balanced performance in mid-power industrial inverters.

Availability

IRS2181PBF is available at Aetrix Electronics and suitable for motor inverter control, induction cooktop drivers, solar microinverter stages, and BLDC fan controllers requiring stable component supply across extended production lifecycles.

Supply support for IRS2181PBF 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 is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The IRS2181PBF belongs to Infineon's high-voltage gate driver product line, engineered specifically for robust half-bridge switching in industrial motor drives, renewable energy inverters, and appliance power stages.

FAQ

What is the maximum allowable dV/dt on the VS pin?

The IRS2181PBF is rated for 50 V/ns dV/dt on the VS pin under standard test conditions (8-lead PDIP). This specification ensures reliable operation during fast-switching events in 600 V bridge circuits without false triggering. The internal level shifter incorporates pulse filtering and latch-immune design to maintain immunity even under worst-case transient conditions.

Can IRS2181PBF drive IGBTs directly?

Yes, IRS2181PBF can directly drive IGBTs with gate charge ≤15 nC at 15 V gate drive, leveraging its 1.4 A source / 1.8 A sink capability and 180/220 ns propagation delays. It supports IGBT gate-emitter voltages up to ±20 V and is commonly used in 1–5 kW induction heating and motor drives where gate drive strength and timing precision are critical.

Is a bootstrap diode required for high-side operation?

Yes, a discrete bootstrap diode (e.g., 1N4148 or fast-recovery type) and capacitor are required between VB and VS to establish the floating high-side supply. The IRS2181PBF does not integrate this diode; it relies on external components to recharge the bootstrap capacitor during low-side conduction periods-standard practice for all bootstrap-based gate drivers in this class.

Does IRS2181PBF have built-in deadtime generation?

No, IRS2181PBF does not generate deadtime internally. It provides independent HIN/LIN inputs and matched propagation delays (≤35 ns skew), requiring external deadtime insertion in the controller (e.g., MCU PWM peripheral or dedicated deadtime generator IC) to prevent shoot-through. This architecture gives designers full timing control and avoids fixed deadtime penalties.