Infineon Technologies IRS2108PBF

Overview

IRS2108PBF 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 channels-used in motor control inverters and SMPS power stages.

For engineers reviewing the IRS2108PBF datasheet, IRS2108PBF pinout, IRS2108PBF application, or IRS2108PBF equivalent, key selection criteria include floating channel bootstrap capability, dV/dt immunity up to 50 V/ns, matched propagation delay (<30 ns), gate drive supply range (10–20 V), and thermal resistance (120 °C/W for 8-lead PDIP).

Technical Context

The IRS2108PBF integrates a high-voltage level shifter and latch-immune CMOS logic to enable robust high-side switching at VS = +600 V referenced to COM. Its pulse filter and cross-conduction prevention logic enforce strict shoot-through avoidance via internal deadtime and matched turn-on/turn-off delays (typ. 220 ns / 200 ns).

It operates with separate logic and power grounds tolerant of ±5 V offset, supports bootstrap gate drive with VB = VS + 10 V to VS + 20 V, and includes independent UVLO thresholds (8.9 V typ.) for VCC and VBS with 0.7 V hysteresis-ensuring reliable startup and fault recovery in noisy industrial environments.

Key Specifications

Pinout & Package

IRS2108PBF is housed in an 8-lead PDIP package with through-hole mounting and standard 0.3-inch body width. Pin assignments are validated per Infineon's official lead diagram (PD60260 Rev. A, p.5): pins 1–8 correspond to VCC, HIN, LIN, COM, VB, HO, VS, LO respectively.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IR2104PBF and UCC27211D, IRS2108PBF uniquely combines 600 V floating capability, internal 540 ns deadtime, dual independent inputs, and matched propagation delays-making it optimal for industrial motor drives requiring robustness, timing precision, and minimal external components.

Availability

IRS2108PBF is available at Aetrix Electronics and suitable for motor control inverters, switch-mode power supplies, solar microinverters, and industrial AC drives requiring stable component supply across extended production lifecycles.

Supply support for IRS2108PBF 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 leadership in high-voltage gate drivers and silicon carbide solutions.

The IRS2108PBF belongs to Infineon's legacy HVIC (High-Voltage Integrated Circuit) gate driver product line, engineered specifically for rugged half-bridge operation in industrial motor drives and offline power conversion systems.

FAQ

Can IRS2108PBF drive both N-channel MOSFETs and IGBTs?

Yes. IRS2108PBF is explicitly rated for driving N-channel power MOSFETs and IGBTs in half-bridge topologies. Its high-side output delivers 290 mA peak source current and 600 mA sink current into 1000 pF loads, supporting typical gate charge requirements of 650 V IGBTs and 500 V MOSFETs per datasheet test conditions (VBIAS = 15 V, TA = 25 °C).

What is the minimum required bootstrap capacitor value for IRS2108PBF?

The minimum bootstrap capacitor depends on gate charge (Qg), switching frequency, and allowable VBS droop. For a 600 V, 30 A IGBT with Qg = 250 nC at 20 kHz, a 0.22 µF ceramic capacitor with low ESR is recommended-validated by Infineon Design Tip DT97-3 to maintain VBS > 10 V across duty cycles and temperature extremes.

Does IRS2108PBF require external pull-down resistors on HIN and LIN inputs?

No. IRS2108PBF includes internal pull-down resistors on both HIN and LIN inputs-ensuring defined logic-low state during power-up, reset, or floating input conditions. This eliminates need for external resistors in most designs, reducing component count and PCB area per Infineon's functional block diagram and application notes.

How does the internal deadtime function without a DT pin?

IRS2108PBF implements fixed 540 ns deadtime internally via dedicated logic circuitry-unlike the IRS21084PBF which adds a DT pin for external resistor programming. This fixed delay is enforced between LO turn-off and HO turn-on, and vice versa, using edge-triggered monostable circuits that override overlapping input pulses to prevent shoot-through.