Infineon Technologies IRS2108SPBF

Overview

IRS2108SPBF from Infineon Technologies is a high-voltage, high-speed dual-channel gate driver IC for N-channel MOSFETs and IGBTs in half-bridge configurations. It features independent high-side (up to +600 V) and low-side output channels, 3.3 V/5 V/15 V logic-compatible inputs, internal 540 ns deadtime, and undervoltage lockout on both supply rails. Used in motor control inverters and SMPS power stages.

For engineers reviewing the IRS2108SPBF datasheet, IRS2108SPBF pinout, IRS2108SPBF application, or IRS2108SPBF equivalent, key selection criteria include floating channel voltage rating (+600 V), matched propagation delay (≤30 ns mismatch), programmable deadtime capability (via external R_DT), gate drive supply range (10–20 V), and dV/dt immunity (50 V/ns).

Technical Context

The IRS2108SPBF integrates a high-voltage level shifter for the floating high-side channel and uses latch-immune CMOS technology to withstand fast transients. Its internal deadtime generator prevents shoot-through by enforcing minimum 540 ns delay between LO turn-off and HO turn-on, with matching ≤60 ns between complementary edges.

Logic inputs (HIN/LIN) are referenced to VSS (not COM), enabling operation across ±5 V logic ground offset. The device supports bootstrap high-side supply configuration and includes UVLO thresholds of 8.2 V (VCC/VBS rising) with 0.7 V hysteresis, ensuring robust start-up and fault recovery.

Key Specifications

Pinout & Package

IRS2108SPBF is housed in an 8-lead SOIC package with gull-wing leads, rated for surface-mount assembly and JEDEC-standard reflow profiles. Thermal resistance R_thJA is 120 °C/W under still-air conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge gate driver applications.

Compared with IR2108SPBF, IRS2108SPBF offers identical functionality and footprint, while IRS21844SPBF adds programmability at the cost of one extra pin and higher BOM complexity-justified only when deadtime optimization is critical.

Availability

IRS2108SPBF is available at Aetrix Electronics and suitable for motor control inverters, industrial SMPS, solar microinverters, and appliance power modules requiring stable component supply and long-term manufacturability.

Supply support for IRS2108SPBF 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 IRS21xx family delivers ruggedized high-voltage gate drivers for half-bridge and full-bridge topologies, designed specifically for reliability in harsh industrial and renewable energy environments.

FAQ

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

The IRS2108SPBF is rated for 50 V/ns dV/dt at the VS pin under standard test conditions using the 8-lead PDIP package. In the SOIC-8 package (IRS2108SPBF), the specified limit is 1.0 V/ns per the datasheet's Absolute Maximum Ratings table. This parameter defines the device's ability to reject false triggering during rapid high-side switching transitions.

Can IRS2108SPBF drive IGBTs directly?

Yes - IRS2108SPBF is explicitly characterized for driving both N-channel MOSFETs and IGBTs. Its 290 mA source / 600 mA sink peak output current, 10–20 V gate supply range, and robust HVIC construction make it suitable for discrete IGBTs up to 30 A/600 V in hard-switched half-bridge applications.

Is an external bootstrap diode required?

Yes - IRS2108SPBF does not integrate a bootstrap diode. A fast-recovery or Schottky diode (e.g., 1N4148 or BAT54) must be placed between VCC and VB to charge the bootstrap capacitor during LO conduction. Diode reverse leakage and forward voltage directly impact high-side drive stability at high duty cycles.

Does IRS2108SPBF support 3.3 V-only logic inputs without level shifting?

Yes - the device accepts 3.3 V logic inputs directly: VIH(min) = 2.5 V and VIL(max) = 0.8 V at VSS = COM, satisfying standard 3.3 V CMOS thresholds. No external level shifter is needed when interfacing with 3.3 V microcontrollers or FPGAs.