IR21271SPBF - 600V High-Side Current-Sensing Gate Driver | Infineon
MPN: IR21271SPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.45 | $14.50 |
| 100 | $1.18 | $118.00 |
| 500 | $0.96 | $480.00 |
| 1,000 | $0.82 | $820.00 |
| 3,000 | $0.71 | $2,130.00 |
IR21271SPBF Overview
A gate driver is a power-management IC that sits between a low-power controller (microcontroller, DSP, FPGA, or analog PWM block) and a high-power switching transistor (MOSFET or IGBT). Its job is to translate a logic-level command into a high-current drive signal capable of rapidly charging and discharging the gate capacitance of the switching device. Within the broader IC hierarchy, gate drivers belong to power management -> MOSFET/IGBT drivers -> high-voltage gate drivers, and they enable the clean, low-loss switching that defines modern switch-mode power supplies, motor controllers, and induction heating inverters.
The IR21271SPBF's key differentiator is its built-in current-sensing capability, eliminating the need for an external current-sense amplifier in many designs. Other headline parameters include a logic-input threshold compatible with 3.3 V CMOS or LSTTL outputs, application-specific gate-drive ranges (20 V for motor drive on the related IR2127/IR2128, lower for automotive variants), dV/dt immunity from the proprietary HVIC and latch-immune CMOS process, and a floating channel designed for bootstrap operation. The 8-pin SOIC footprint allows compact PCB layouts.
Architecturally, the device uses Infineon's proprietary HVIC technology to integrate a level-shifter, latch-immune CMOS logic, and a push-pull output stage on a monolithic die. The high pulse-current buffer stage minimizes cross-conduction, and the floating channel can drive an N-channel power MOSFET or IGBT in high-side or low-side configurations operating up to 600 V. The current-sensing output provides feedback proportional to the drain current.
Typical applications include three-phase motor drives, automotive ignition systems, switch-mode power supplies, induction heating, and high-voltage DC-DC converters. Its 600 V rating and current-sense output make it especially suitable for variable-frequency drives and switched-mode power topologies where overcurrent protection is required.
When designing with the IR21271SPBF, ensure the bootstrap capacitor is sized correctly for the switching frequency and gate charge, and verify that the VS pin's negative-transient tolerance is not exceeded during switching events. A small RC filter on the current-sense output improves noise immunity in motor-control loops.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the IR21271SPBF - information not consolidated in the manufacturer datasheet.
Drop-in alternatives for IR21271SPBF — 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 IR21271SPBF (same form factor and footprint) — differing in Package, Configuration, Lead-Free / RoHS, Logic Input Compatibility, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
IR21271STRPBF
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →IR21271STRPBF
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →IR2127STRPBF
✅ Drop-In✓ In Stock
$0.71 / Unit
View Datasheet →IR2128STRPBF
✅ Drop-In✓ In Stock
$0.86 / Unit
View Datasheet →IRS21171SPBF
✅ Drop-In📋 Reference alternative (not in catalog)
IRS2008STRPBF
✅ Drop-In✓ In Stock
$0.334 / Unit
View Datasheet →IRS2005STRPBF
✅ Drop-In✓ In Stock
$0.18 / Unit
View Datasheet →IR21271SPBF Maximum Ratings & Electrical Characteristics
| Product Type | Single-channel high-side gate driver with current sensing |
| Technology | HVIC and latch-immune CMOS |
| Maximum Floating Supply Voltage | 600 V |
| Output Source Current | 0.25 A |
| Output Sink Current | 0.5 A |
| Gate Drive Voltage Range | 9 V to 20 V (per related IR2127 datasheet family) |
| Configuration | High-side, low-side capable (floating channel) |
| Input Logic Compatibility | 3.3 V CMOS / LSTTL |
| Input Type | Non-inverting |
| Negative Transient Tolerance (dV/dt) | Tolerant |
| Bootstrap Operation | Supported (floating channel) |
| Integrated Current Sensing | Yes |
| Package | 8-SOIC |
| Lead Finish | Lead-free (PbF) |
| Operating Temperature Range | -40C to +125C (industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Number of Channels | 1 |
IR21271SPBF Pin Configuration
| Pin 1 | IN — Logic input (non-inverting, 3.3 V CMOS / LSTTL compatible) |
| Pin 2 | VSS — Logic ground reference |
| Pin 3 | VCC — Logic supply voltage (typically 12-15 V) |
| Pin 4 | CS — Current-sense output [DATA_NEEDED: confirm pin number against datasheet pin configuration table] |
| Pin 5 | VS — High-side floating supply return (connected to MOSFET source / IGBT emitter) |
| Pin 6 | HO — High-side gate-drive output |
| Pin 7 | VB — High-side floating supply (bootstrap supply) |
| Pin 8 | NC — Not connected (per datasheet pin configuration) |
Typical Applications
IR21271SPBF is suitable for 6 applications: Three-Phase Variable-Frequency Motor Drive, Automotive Ignition System, Switch-Mode Power Supply (SMPS) Primary-Side Drive, Induction Heating Cooktop Inverter, Solar Inverter / Photovoltaic DC-DC Converter, Uninterruptible Power Supply (UPS) Power Stage.
Three-Phase Variable-Frequency Motor Drive
Drives the high-side IGBTs in 400 V / 480 V three-phase motor inverters for HVAC blowers, industrial pumps, and conveyor systems. The IR21271SPBF's 600 V floating-channel rating comfortably handles 480 V bus transients with margin, and the integrated current-sensing output simplifies overcurrent protection - a critical feature in variable-frequency drives (VFDs) where short-circuit detection must respond in microseconds. The 0.25 A source / 0.5 A sink drive current supports IGBT switching frequencies up to 20 kHz for typical motor-control loops. Bootstrap operation eliminates the need for an isolated supply per phase, reducing BOM cost. Pair with companion gate-driver ICs for the low-side switches.
Recommended
Automotive Ignition System
Drives the IGBT in coil-on-plug ignition systems for 12 V automotive applications. The IR21271SPBF's current-sensing output enables primary-coil current profiling - critical for dwell-time control and spark-energy management in modern engines. The IR21271 family variants are available with automotive-optimized gate-drive voltage ranges; verify AEC-Q100 qualification on the chosen variant for engine-ECU applications. The 600 V rating provides ample margin for 12 V / 24 V system transients and inductive kickback. Bootstrap supply architecture simplifies PCB layout compared to transformer-isolated alternatives.
Recommended
Switch-Mode Power Supply (SMPS) Primary-Side Drive
Drives the primary-side MOSFET in isolated half-bridge and full-bridge SMPS topologies for telecom and industrial power systems. The IR21271SPBF's high-side drive capability combined with bootstrap supply eliminates the need for a separate gate-drive transformer, simplifying the magnetic design. The integrated current-sensing output provides primary-peak-current information for current-mode control loops, enabling faster transient response and cycle-by-cycle overcurrent protection. The 600 V rating supports 380 V DC bus operation typical of three-phase PFC front ends.
Recommended
Induction Heating Cooktop Inverter
Drives the high-voltage IGBTs in resonant inverter stages of induction cooktops operating at 20-50 kHz. The IR21271SPBF's 0.5 A sink current rapidly discharges IGBT gate capacitance to minimize switching losses during zero-voltage-switching (ZVS) transitions. The integrated current-sensing output enables resonant-tank current monitoring for adaptive frequency control - essential for pot-detection and pan-load optimization. The 600 V rating handles rectified 230 V AC mains with comfortable margin.
Recommended
Solar Inverter / Photovoltaic DC-DC Converter
Drives the high-side IGBT or MOSFET in PV string inverters and DC-DC boost stages converting solar panel output to grid-tie DC bus voltages. The IR21271SPBF's 600 V rating handles 1500 V DC string architectures with appropriate derating, and the integrated current-sensing output supports maximum power point tracking (MPPT) algorithms. Bootstrap supply architecture enables compact, high-efficiency designs without isolated gate-drive supplies. The 8-SOIC package provides adequate thermal performance at typical solar-inverter switching frequencies of 16-32 kHz.
Recommended
Uninterruptible Power Supply (UPS) Power Stage
Drives IGBT modules in online UPS systems converting battery DC to grid-quality AC. The IR21271SPBF's current-sensing output enables inverter current-mode protection - critical for UPS systems where overcurrent detection must trigger in microseconds to protect downstream loads. The 600 V rating supports 380-400 V DC bus systems typical of three-phase UPS installations. The bootstrap-operation capability simplifies the gate-driver power architecture across the H-bridge inverter switches, reducing BOM count.
Recommended
Recommended Products Summary
Engineering reference data for IR21271SPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IR21271STRPBF | IR21271S | IR2127STRPBF | IR2128STRPBF | IRS21171SPBF | IRS2008STRPBF | IRS2005STRPBF |
|---|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Maximum Floating Voltage | 600 V | 600 V (same) | 600 V (same) | 600 V (same) | 600 V (same) | 600 V (same) | 200 V (lower) | 200 V (lower) |
| Integrated Current Sensing | Yes | Yes (same) | Yes (same) | No | No | No | No | No |
| Input Logic | Non-inverting | Non-inverting (same) | Non-inverting (same) | Non-inverting (same) | Inverting | Non-inverting | Non-inverting | Non-inverting |
| Channels | 1 (single) | 1 (same) | 1 (same) | 1 (same) | 1 (same) | 2 (half-bridge) | 2 (half-bridge) | 2 (half-bridge) |
| Lead-Free (PbF) | Yes | Yes | No (leaded) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated current-sensing output eliminates external sense amplifier (vs IR2127STRPBF)
- Single-channel vs half-bridge topology trade-off (vs IRS21171SPBF)
- 600 V rating supports 480 V industrial bus systems (vs IRS2008STRPBF)
Design Notes
Bootstrap capacitor sizing: choose C_Boot = (Q_gate + I_leak * t_on_max) / (V_CC - V_F - V_GS_min). For a typical 100 nC IGBT at 20 kHz with 50% duty cycle, a 1 uF X7R ceramic bootstrap capacitor provides adequate charge. Add a series bootstrap resistor (10-47 ohm) to limit in-rush current during initial charging, and place a fast-recovery bootstrap diode (UF4007 or better) to block the high-side rail. Insufficient bootstrap capacitance causes V_UVLO faults and high-side lockout.
Negative transient on VS pin: the IR21271SPBF is tolerant to negative transients, but extreme dV/dt events from the switched-node can still cause logic-level glitches. Place the IR21271SPBF within 5 cm of the driven IGBT/MOSFET and use a Kelvin source connection (separate power and signal grounds tied only at the source pin). Add a 10-100 ohm gate resistor to dampen parasitic ringing between gate driver and gate-emitter capacitance.
Layout recommendations: keep the high-side gate-drive loop (IR21271 HO pin -> gate resistor -> IGBT gate -> IGBT emitter -> IR21271 VS pin) as small as possible to minimize parasitic inductance. Use a ground plane on the bottom layer and avoid routing signal traces under the 8-SOIC body. Place a 100 nF decoupling capacitor on VCC (pin 3) within 3 mm of the IC, plus a 10 uF bulk capacitor on the same node.
Compliance Information
PbF suffix denotes lead-free compliance. AEC-Q100 qualification status is not standard on SPBF suffix parts - check for IR21271Q variants for automotive applications.
