IR2128STRPBF - 600V High-Side Gate Driver IC | Infineon
MPN: IR2128STRPBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.92 | $1.92 |
| 10 | $1.72 | $17.20 |
| 100 | $1.48 | $148.00 |
| 500 | $1.21 | $605.00 |
| 1,000 | $0.99 | $990.00 |
| 2,500 | $0.86 | $2,150.00 |
IR2128STRPBF Overview
A high-side gate driver is a specialized power-management IC that level-shifts a low-voltage logic signal up to a floating high-voltage rail, allowing a low-side controller (such as a 3.3 V MCU) to switch an N-channel power MOSFET or IGBT placed on the high side of a half-bridge. High-side drivers sit inside the broader hierarchy of gate drivers -> power management ICs -> PMIC -> semiconductor, and they are indispensable in bridge-tied converters, three-phase inverters, and any topology where the low-side switch cannot deliver the required load current or voltage swing. Bootstrap supply architecture, used by the IR2128STRPBF, lets a single supply rail feed both low-side and high-side switch gates without a dedicated isolated DC/DC converter.
Key features include a 200 ns typical propagation delay, integrated undervoltage lockout (UVLO) for the logic and gate-drive rails, current-sense comparator with programmable threshold, and a fault indicator output that pulls low to flag over-current events to the host controller. The CMOS/HVIC latch-immune process gives the IC monolithic robustness against dv/dt-induced false triggering on the high-side return (VS) node.
Typical applications include general-purpose variable-frequency drives (VFD), IGBT/MOSFET modules in industrial inverters, three-phase induction-motor half-bridges (one IR2128STRPBF per phase), DC-DC buck/boost converters with high-side synchronous rectifiers, and switched-mode power supplies (SMPS) needing a single high-side switch. The 600 V rating covers 230 VAC and 400 VAC rectified rails with ample margin.
Design considerations: keep the bootstrap diode and capacitor close to the VB-VS pins to minimize charge transients; a 1N4148 plus 1 uF ceramic cap is typical. Verify the VS-node dv/dt does not exceed the dV/dt rating during commutation, otherwise the floating-well can inject shoot-through. The current-sense resistor and RC filter at the CS pin set the over-current trip threshold.
Drop-in alternatives for IR2128STRPBF — 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 IR2128STRPBF (same form factor and footprint) — differing in Package, Configuration, Lead-Free / RoHS, Operating Temperature Range, Input Logic Compatibility.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
IR2128SPBF
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →IR2128S
✅ Drop-In📋 Reference alternative (not in catalog)
IR2127STRPBF
✅ Drop-In✓ In Stock
$0.71 / Unit
View Datasheet →IR21271STRPBF
✅ Drop-In✓ In Stock
$1.82 / Unit
View Datasheet →IR2304SPBF
✅ Drop-In✓ In Stock
$0.48 / Unit
View Datasheet →IRS21867STRPBF
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →IR2128STRPBF Maximum Ratings & Electrical Characteristics
| Configuration | High-Side, Low-Side Gate Driver |
| Input Polarity | Inverting |
| Number of Drivers | 1 |
| Maximum Offset Voltage (Voffset) | 600 V |
| Gate Drive Supply Voltage (VCC) | 12 V to 20 V |
| Source Current (typ.) | 0.25 A |
| Sink Current (typ.) | 0.5 A |
| Propagation Delay (typ.) | 200 ns |
| Logic Input Compatibility | 3.3 V / 5 V CMOS, LSTTL |
| Undervoltage Lockout (UVLO) | Yes |
| Over-Current Protection | Yes (current-sense comparator, fault output) |
| dv/dt Immunity | Yes |
| Negative VS Transient Tolerance | Yes |
| Operating Temperature Range | -40C to +125C |
| Package | 8-SOIC (0.154", 3.90 mm width) |
| Mounting Type | Surface Mount |
| MSL Level | 2 |
| Lead-Free / RoHS | Yes (PBF suffix indicates Pb-free) |
| Fault Output | Open-drain, active-low |
| Bootstrap Pin | VB (with respect to VS) |
IR2128STRPBF Pin Configuration
| Pin 1 | VCC — Logic and gate-drive supply, 12 V to 20 V |
| Pin 2 | IN — Logic input (inverting, 3.3 V / 5 V CMOS compatible) |
| Pin 3 | FLT — Fault output, open-drain, active-low |
| Pin 4 | CS — Current-sense comparator input |
| Pin 5 | GND — Logic ground return |
| Pin 6 | VS — High-side floating return / bootstrap return |
| Pin 7 | VB — Bootstrap supply for high-side driver |
| Pin 8 | HO — High-side gate-drive output |
Typical Applications
IR2128STRPBF is suitable for 6 applications: Variable-Frequency Drive (VFD) for AC Motors, Switched-Mode Power Supply (SMPS) with High-Side Switch, Industrial Three-Phase Inverter, DC-DC Buck Converter with High-Side Synchronous Rectifier, Solar Microinverter / String Inverter, Welding & Plasma-Cutter Power Stage.
Variable-Frequency Drive (VFD) for AC Motors
The IR2128STRPBF drives the high-side IGBT in each phase of a three-phase VFD inverter for AC induction motors, simplifying gate-drive isolation and protection. The IC's 600 V Voffset rating covers rectified 230/400 VAC bus rails with margin, and the 0.5 A sink current rapidly discharges the IGBT gate charge for clean turn-off and reduced switching loss. Its integrated current-sense comparator with fault output allows per-phase short-circuit detection within microseconds, critical for protecting expensive IGBT modules. The bootstrap supply (VB-VS) lets one 15 V rail drive all three phases, eliminating isolated DC/DC converters. Engineers pair one IR2128STRPBF per phase with a low-side gate driver or use an IR2233/IR2136x three-phase half-bridge driver for integrated solutions in industrial motor drives up to 5-10 kW.
Recommended
Switched-Mode Power Supply (SMPS) with High-Side Switch
In a forward or half-bridge SMPS topology the IR2128STRPBF drives the high-side primary MOSFET or the high-side synchronous rectifier, eliminating the need for a gate-drive transformer. The 600 V rating is well suited to 400 V rectified telecom bus converters and industrial SMPS, while the 200 ns propagation delay enables switching frequencies up to 250 kHz for compact magnetic sizing. Per the Infineon datasheet, the integrated over-current comparator monitors the CS input from a current-sense transformer or shunt, latching the fault pin low and turning off the gate within microseconds of a fault. This single-chip solution reduces BOM and PCB area compared to discrete optocoupler-plus-driver designs, particularly in 1-3 kW industrial and telecom power supplies.
Recommended
Industrial Three-Phase Inverter
The IR2128STRPBF is well suited to discrete three-phase IGBT or MOSFET inverter designs where engineers prefer individual drivers per switch over monolithic three-phase drivers, gaining PCB layout flexibility and paralleling options. Each IR2128STRPBF drives one high-side switch in a half-bridge, paired with a low-side driver for the complementary switch, delivering independent fault handling per switch. The 0.25 A source / 0.5 A sink drive levels match 600 V / 50-100 A IGBT modules used in solar inverters, servo drives, and uninterruptible power supplies (UPS). Per the datasheet, the integrated dV/dt immunity and negative VS transient tolerance make it robust against the harsh switching noise found in industrial inverters, where stray inductance can otherwise cause catastrophic high-side driver latch-up.
Recommended
DC-DC Buck Converter with High-Side Synchronous Rectifier
The IR2128STRPBF drives the high-side N-channel MOSFET in a synchronous buck converter operating from 48 V, 72 V, or 96 V telecom and industrial bus rails, replacing the Schottky or low-side P-channel rectifier with a higher-efficiency N-channel synchronous rectifier. The 600 V offset comfortably exceeds 96 V input with margin, and the 200 ns propagation delay enables 200 kHz+ switching for high-power-density designs in the 500 W to 2 kW range. Per the Infineon datasheet, the bootstrap supply (VB-VS) auto-charges via the internal bootstrap diode when VS swings to ground each cycle, eliminating an external high-side supply. The current-sense comparator triggers fault protection during output over-current events, providing cycle-by-cycle or latched current limiting with simple RC adjustment at the CS pin.
Recommended
Solar Microinverter / String Inverter
In photovoltaic microinverters and string inverters, the IR2128STRPBF drives the high-side IGBT or MOSFET in the DC-AC stage operating from 400 V DC link, isolating the low-voltage MCU gate signal to the floating high-side rail. Per the Infineon datasheet, the 600 V rating covers a 400 V DC bus with 50% safety margin for transient spikes from grid events. The integrated over-current comparator triggers module-level shutdown within microseconds of a short-circuit, preventing IGBT rupture from a panel mis-wire. The 0.25 A / 0.5 A source/sink currents drive 50-100 A class IGBT modules typical of 1-3 kW residential microinverters, while the small 8-SOIC footprint fits compact panel-mount inverter enclosures where PCB area is at a premium.
Recommended
Welding & Plasma-Cutter Power Stage
The IR2128STRPBF drives the high-side IGBTs in welding inverter and plasma-cutter power stages where peak currents can exceed 200 A and bus voltages reach 600 V rectified mains. The 0.5 A sink current is sufficient to switch 600 V / 200 A IGBT modules at 20-50 kHz, the typical switching frequency for arc stability and audible-noise reduction. Per the datasheet, the integrated over-current comparator with fault output enables cycle-by-cycle arc-shorting detection, a critical safety function in welding inverters where the workpiece can short the electrode mid-cycle. The high-side floating supply tolerance to negative VS transients is essential in welding, where load-induced ringing can pull VS 10-20 V below ground during commutation events.
Recommended
Recommended Products Summary
Engineering reference data for IR2128STRPBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | IR2128SPBF | IR2128S | IR2127STRPBF | IR21271STRPBF | IR2304SPBF | IRS21867STRPBF |
|---|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | 8-SOIC (0.154", 3.90 mm) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Configuration | Single High-Side | Single High-Side | Single High-Side | Single High-Side (non-inverting) | Single High-Side current sensing | Half-Bridge (high + low side) | Half-Bridge (high + low side) |
| Voffset (max) | 600 V | 600 V | 600 V | 600 V | 600 V | 600 V | 600 V |
| Source / Sink Current | 0.25 A / 0.5 A | 0.25 A / 0.5 A | 0.25 A / 0.5 A | 0.25 A / 0.5 A | 0.25 A / 0.5 A | 0.13 A / 0.27 A (typ.) | 1.9 A / 2.3 A (much higher drive) |
| Propagation Delay | 200 ns | 200 ns | 200 ns | 200 ns | 200 ns | 220 ns | 150 ns |
| Input Polarity | Inverting | Inverting | Inverting | Non-inverting | Non-inverting | Non-inverting (high/low side) | Non-inverting (high/low side) |
| Over-Current Protection | Yes (CS comparator + FLT) | Yes | Yes | No | Yes (current sensing variant) | No | No (separate shutdown pin) |
Key Differentiators
- Integrated over-current comparator with fault output (vs IR2127STRPBF)
- Inverting input for noise-immunity applications (vs IR2127STRPBF / IR21271STRPBF)
- Higher drive strength than IR2304 family (vs IR2304SPBF)
- Single-channel vs half-bridge trade-off (vs IRS21867STRPBF)
Design Notes
Bootstrap supply design (critical): The IR2128STRPBF uses a bootstrap capacitor on the VB pin to supply the high-side driver referenced to the VS node. Per Infineon's datasheet section on bootstrap component selection, choose a fast-recovery bootstrap diode (e.g. 1N4148 or UF4007) rated at >100 V reverse voltage, plus a 1 uF to 10 uF ceramic bootstrap capacitor with low ESR. The capacitor must recharge fully during each VS low-side cycle; undersizing causes the high-side gate to droop under heavy load, leading to shoot-through or partial-turn-on. Estimate: at 0.25 A source current and 100 kHz switching with 50% duty cycle, a 1 uF cap drops only ~1.25 V per cycle (well within the 12-20 V supply range).
High-side loop layout (critical): Keep the high-side gate-driver loop (VB - HO - gate - source - VS - bootstrap cap - back to VB) as small as physically possible, ideally under 1 cm squared of enclosed area. Per Infineon application notes on HVIC PCB layout, a large high-side loop picks up VS-node dv/dt ringing (typically 5-10 V/ns in a 600 V / 50 A switching event), which can falsely trigger the undervoltage lockout or, in extreme cases, latch the high-side output. Use a ground-plane cut-out under the floating region to minimize parasitic capacitance from VB/VS to logic GND, and place the bootstrap diode and capacitor within 5 mm of the IC pins.
Current-sense comparator pitfalls (recommended): The CS pin input has a common-mode range tied to VCC and accepts either positive- or negative-going shunt signals depending on the application circuit topology. Per the datasheet, an RC filter (typically 1 kohm + 100 pF to 1 nF) is recommended between the shunt resistor and CS pin to reject switching noise that would otherwise cause false fault trips. Do not let the CS pin voltage exceed VCC; clamp with a Schottky diode if the shunt signal can swing above VCC during transients. The fault output (FLT) is open-drain and requires an external pull-up to VCC or logic rail; it remains asserted until the input is cycled.
Thermal management (optional): Estimated: At VCC = 15 V, switching frequency = 100 kHz, with a 50 nC IGBT gate charge, the IR2128STRPBF dissipates approximately P = VCC * Qg * fsw = 15 V * 50 nC * 100 kHz = 75 mW from the gate-charge path alone, plus quiescent current of ~1-3 mA at 15 V (15-45 mW). Total dissipation is typically under 150 mW in a 100 kHz / 50 nC application, well within the 8-SOIC's 150 C/W theta_JA rating on a 1 oz copper 1 sq inch pad (junction rise ~22 C above ambient). No external heatsink is required for normal operation.
Compliance Information
Pb-free per Infineon PBF suffix marking. RoHS compliant per manufacturer product page. Not AEC-Q100 qualified - for automotive use, consult Infineon automotive-grade gate driver portfolio.
