IR2181SPBF - 600V Half-Bridge Gate Driver IC | Infineon
MPN: IR2181SPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.78 | $1.78 |
| 10 | $1.52 | $15.20 |
| 100 | $1.18 | $118.00 |
| 500 | $0.97 | $485.00 |
| 1,000 | $0.84 | $840.00 |
| 2,500 | $0.72 | $1,800.00 |
IR2181SPBF Overview
A gate driver IC is a power-management component that translates low-current PWM logic signals from a microcontroller or DSP into the high-current gate-drive signals required to switch power MOSFETs or IGBTs. Half-bridge gate drivers specifically drive the high-side and low-side switches of a half-bridge, providing the level-shifting needed to reference the high-side gate to the switching node. Within the broader taxonomy, the IR2181 belongs to gate drivers -> driver ICs -> power management ICs -> semiconductors, and uses Infineon's proprietary HVIC (High-Voltage Integrated Circuit) and latch-immune CMOS technologies for rugged monolithic construction.
Key features include dV/dt immunity, undervoltage lockout (UVLO) for both the high-side and low-side channels, a separate logic supply range from 3.3 V to 20 V, and tolerance to negative transient voltages on the high-side return (VS pin). The matched propagation delay between high-side and low-side channels (typically ~140 ns) and the small 8-SOIC footprint make the IR2181SPBF well-suited to compact motor-drive and SMPS designs where board area and switching timing symmetry are critical.
The architecture combines a level-shifted high-side channel driven from a bootstrap capacitor with a ground-referenced low-side channel. The high-side channel can float up to 600 V above ground, while the integrated deadtime logic and the matched propagation delays protect against cross-conduction in the half-bridge. This monolithic HVIC construction removes the need for an isolated DC-DC converter for the high-side gate drive, reducing BOM cost and PCB area.
Typical applications include three-phase and single-phase motor drives (variable-frequency drives, HVAC compressors, small appliances), switch-mode power supplies (SMPS), uninterruptible power supplies (UPS), half-bridge and full-bridge DC-DC converters, and Class-D audio amplifiers. The 3.3 V logic compatibility allows direct interfacing with low-voltage microcontrollers, removing the need for a logic-level translator.
When designing with the IR2181SPBF, observe the bootstrap capacitor selection and refresh requirements for the high-side supply (VB-VS). An undersized bootstrap capacitor causes excessive ripple on VB and may trigger UVLO under high duty cycle or low-frequency operation. Use a low-ESR ceramic bypass capacitor close to the VCC and VB pins to keep the gate-drive rail stable under high peak currents.
This page synthesizes distributor pricing, drop-in alternatives from Infineon and competitor lines, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for IR2181SPBF β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with IR2181SPBF (same form factor and footprint) β differing in Package, Configuration, Logic Input Compatibility, Operating Temperature Range, RoHS Status.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
IR2181STRPBF
β Drop-Inβ In Stock
$0.74 / Unit
View Datasheet βIR2101STRPBF
β Drop-Inβ In Stock
$0.22 / Unit
View Datasheet βIR2104STRPBF
β Drop-Inβ In Stock
$0.59 / Unit
View Datasheet βNCP5106BDR2G
β Drop-Inπ Reference alternative (not in catalog)
UCC27714DR
β Drop-Inπ Reference alternative (not in catalog)
IR2181SPBF Maximum Ratings & Electrical Characteristics
| Driver Configuration | Half-Bridge (High Side + Low Side) |
| Number of Outputs | 2 (independent high-side and low-side) |
| High-Side Offset Voltage | Up to +600 V |
| Gate Drive Supply (VCC, VB-VS) | 10 V to 20 V |
| Logic Supply (VDD/VSS) | 3.3 V to 20 V (logic-level compatible) |
| Source/Sink Drive Current | 1.9 A source / 2.3 A sink (typical) |
| Logic Input Compatibility | 3.3 V, 5 V, and 15 V logic |
| Propagation Delay (typ.) | 140 ns (typical) |
| UVLO | Yes (both channels) |
| dV/dt Immunity | Yes (latch-immune CMOS) |
| Negative Transient on VS | Tolerant |
| Operating Temperature | -40C to +125C |
| Package | 8-pin SOIC (SO-8) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
IR2181SPBF Pin Configuration
| Pin 1 | VCC β Low-side and logic supply voltage (10 V to 20 V) |
| Pin 2 | IN β Logic input for high-side / low-side control (3.3 V to 20 V compatible) |
| Pin 3 | COM β Low-side return (ground) |
| Pin 4 | LO β Low-side gate-drive output |
| Pin 5 | NC β Not connected (per datasheet) |
| Pin 6 | VS β High-side floating supply return (switching node) |
| Pin 7 | HO β High-side gate-drive output |
| Pin 8 | VB β High-side floating supply (bootstrap to VS) |
Typical Applications
IR2181SPBF is suitable for 6 applications: Three-Phase Variable-Frequency Motor Drive, Half-Bridge SMPS / DC-DC Converter, Uninterruptible Power Supply (UPS) Inverter, Class-D Audio Amplifier Output Stage, HVAC Compressor and Fan Motor Drive, Solar Microinverter and Power Optimizer.
Three-Phase Variable-Frequency Motor Drive
The IR2181SPBF drives the IGBT half-bridge legs of small three-phase VFDs up to several kilowatts. Its 600 V high-side offset voltage directly supports 400 V and 480 V AC bus systems, while the 1.9 A source / 2.3 A sink drive current charges the IGBT gate within tens of nanoseconds. The 8-pin SOIC footprint keeps the driver section compact, allowing three IR2181SPBF devices to fit on a single inverter PCB alongside a microcontroller or DSP. The matched propagation delays between high-side and low-side channels reduce shoot-through risk, and the integrated UVLO protects the IGBTs during low-VCC conditions at startup or fault events.
Recommended
Half-Bridge SMPS / DC-DC Converter
In hard-switched half-bridge and full-bridge SMPS topologies, the IR2181SPBF provides the high-current gate-drive signals needed to switch primary-side MOSFETs at 100 kHz to 500 kHz. The bootstrap-capacitor-based high-side drive eliminates an isolated DC-DC converter for the upper MOSFET, reducing BOM cost. The 3.3 V logic input compatibility allows direct interface with digital PWM controllers without a level shifter. With 1.9 A source / 2.3 A sink, the IR2181SPBF can drive MOSFETs up to ~200 nC total gate charge. The dV/dt immunity and negative transient tolerance protect the driver against ringing caused by transformer leakage inductance and primary-side parasitic capacitance.
Recommended
Uninterruptible Power Supply (UPS) Inverter
The IR2181SPBF is well suited for low- to medium-power UPS inverter stages that convert battery DC into 230 V AC mains during grid outages. Its 600 V high-side rating covers the 400 V DC bus typical of online UPS designs, and the half-bridge topology pairs naturally with a full-bridge output stage built from two or three IR2181SPBF devices. Undervoltage lockout on both channels protects the IGBTs when the battery voltage sags under heavy load. The latch-immune CMOS HVIC technology ensures the driver survives the dv/dt transients generated by the output filter inductor and the IGBT reverse-recovery spikes during commutation.
Recommended
Class-D Audio Amplifier Output Stage
The IR2181SPBF drives the half-bridge output stage of Class-D audio amplifiers where each output channel uses two N-channel MOSFETs in a complementary switching configuration. The 1.9 A source current charges the MOSFET gate quickly, minimizing deadtime and reducing total harmonic distortion (THD). The matched high-side/low-side propagation delay (~140 ns typical) keeps channel-to-channel timing symmetric, which directly impacts audio quality. The 3.3 V logic compatibility accepts PWM audio signals directly from a DSP. For higher-power Class-D amplifiers, parallel multiple IR2181SPBF channels or upgrade to the IR2110 family.
Recommended
HVAC Compressor and Fan Motor Drive
In HVAC systems, the IR2181SPBF drives the BLDC or PMSM compressor motor inverter in air conditioners and heat pumps. The 8-SOIC footprint allows compact PCB integration inside the compressor housing, and the -40C to +125C operating range covers outdoor unit temperatures. The 600 V high-side rating supports 220 V and 380 V mains-powered systems. Undervoltage lockout prevents the IGBTs from operating in the linear region during brownouts, extending module lifetime. The 3.3 V logic input accepts PWM signals from a low-cost microcontroller, enabling variable-speed compressor control for inverter HVAC units.
Recommended
Solar Microinverter and Power Optimizer
The IR2181SPBF drives the half-bridge stage of small grid-tie solar microinverters (200 W to 600 W class) and module-level power optimizers. The 600 V offset covers the 400 V DC link typical of single-phase microinverters. The 1.9 A source current switches high-voltage IGBTs at the 20-50 kHz frequencies common in transformer-isolated microinverter designs. The 3.3 V logic compatibility allows direct connection to a low-power MPPT controller. The negative-VS transient tolerance prevents latch-up from the transformer's leakage inductance spikes, which is critical for long-term reliability in outdoor PV installations.
Recommended
Recommended Products Summary
Engineering reference data for IR2181SPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IR2181STRPBF | IR2101STRPBF | IR2104STRPBF | NCP5106BDR2G | UCC27714DR |
|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | onsemi | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same | 8-pin SOIC - same |
| Topology | Half-Bridge (HS+LS) | Half-Bridge (HS+LS) | Half-Bridge (HS+LS) | Half-Bridge (HS+LS) with deadtime | Half-Bridge (HS+LS) | Half-Bridge (HS+LS) |
| High-Side Offset Voltage | 600 V | 600 V | 600 V | 600 V | 600 V | 600 V |
| Source Drive Current (typ.) | 1.9 A | 1.9 A | 0.13 A | 0.13 A | 0.25 A | 4.0 A |
| Sink Drive Current (typ.) | 2.3 A | 2.3 A | 0.27 A | 0.27 A | 0.5 A | 4.0 A |
| Gate Drive Supply | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V | 10 V to 20 V |
| Logic Compatibility | 3.3 V to 20 V | 3.3 V to 20 V | 3.3 V to 20 V | 3.3 V to 20 V | 3.3 V to 20 V | 3.3 V to 20 V |
| UVLO | Yes (both channels) | Yes (both channels) | Yes (both channels) | Yes (both channels) | Yes (both channels) | Yes (both channels) |
Key Differentiators
- Higher peak gate-drive current than IR2101 family (vs IR2101STRPBF)
- Cross-brand 8-SOIC drop-in available from onsemi (vs NCP5106BDR2G)
- Higher drive current than TI UCC27714 in same package (vs UCC27714DR)
Design Notes
The bootstrap capacitor (Cboot) connected between VB and VS must be sized to maintain the high-side supply above the UVLO threshold during the high-side on-time. As a rule of thumb, select Cboot at least 10x the gate charge of the high-side MOSFET (Qg_hs). For example, if Qg_hs = 50 nC and the high-side on-time is 10 us, choose Cboot >= 0.47 uF with low ESR. Add a small-series bootstrap resistor (5-10 ohm) to limit inrush current and reduce ringing on VS.
Do not exceed the negative transient rating on the VS pin. Although the IR2181SPBF is rated for negative VS transients, sustained negative voltage (e.g., from a misaligned bootstrap diode) can trigger latch-up. Place the bootstrap diode (DBST) directly between VCC and VB with minimum trace length, and ensure the high-side turn-on does not coincide with a low-side reverse-recovery spike. Add a small RC snubber (10 ohm + 1 nF) across the low-side MOSFET if reverse-recovery overshoot exceeds -5 V.
Use a 4-layer PCB with a dedicated ground plane under the driver. Keep the high-current gate-drive loops (VCC -> HO -> gate -> source -> COM -> VCC) as small as possible - ideally under 1 square cm. Place a 100 nF X7R ceramic bypass capacitor on VCC within 2 mm of pin 1 and a 100 nF X7R capacitor on VB within 2 mm of pin 8. Wide copper pours on HO and LO traces (>=0.5 mm) minimize inductive spike overshoot during fast switching transitions.
The 8-pin SOIC has a thermal resistance of approximately 150 C/W (theta_JA) on a standard JEDEC 2s2p test board. At a switching frequency of 100 kHz with 50 nC gate charge, the gate-driver dissipation is roughly 0.25 W (P = Qg * Vg * fsw), which yields a junction temperature rise of ~38 C above ambient. At higher frequencies (1 MHz) or with larger IGBTs (Qg > 200 nC), consider the SOIC-14 version (IR21814) for improved thermal performance.
Compliance Information
RoHS compliant per Infineon product page. SPBF suffix indicates lead-free, halogen-free, RoHS-compliant assembly. Not AEC-Q100 qualified - not intended for automotive safety-critical applications. For automotive-grade gate drivers in the same family, consider IR21814S or the dedicated automotive-grade IRS2003S.
