Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Gate Drivers

Infineon Technologies IRS21851SPBF

Name: IRS21851SPBF
Brand: Infineon Technologies
SKU: IRS21851SPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: IRS21851SPBF

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: IRS21851SPBF.pdf

Description:: IC GATE DRVR HIGH-SIDE 8SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,684

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

IRS21851SPBF from Infineon Technologies is a high-side gate driver IC designed for driving N-channel MOSFETs in half-bridge configurations. It features 600 V high-voltage level-shifting, 2.5 A peak source/sink current, and integrated bootstrap diode. It operates with 10–20 V V_DD, supports 15 ns propagation delay (typ), and is used in BLDC motor inverters and industrial power supplies.

For engineers reviewing the IRS21851SPBF datasheet, IRS21851SPBF pinout, IRS21851SPBF application, or IRS21851SPBF equivalent, key selection criteria include high-side drive capability, bootstrap-based floating supply operation, propagation delay matching, and 600 V HVIC isolation rating.

Technical Context

The IRS21851SPBF integrates a high-voltage level shifter and logic-compatible input to enable direct microcontroller interfacing. Its internal circuitry provides undervoltage lockout (UVLO) on both V_CC and V_BS, with thresholds at 10.1 V (V_CC) and 8.8 V (V_BS).

It uses a monolithic high-voltage IC (HVIC) process to achieve 600 V blocking capability between HO and VS pins. The output stage delivers 2.5 A peak current with matched rise/fall times (25 ns typ) and built-in dead-time immunity via independent input control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BS Max	600 V - Enables direct connection to high-side switch node in 400 V DC bus systems
I_O Peak	±2.5 A - Sufficient to drive 10 nC gate charge MOSFETs at 100 kHz switching
t_PHL/t_PLH	15 ns (typ) - Supports precise timing alignment in synchronous half-bridge PWM control
V_DD Range	10–20 V - Compatible with standard 12 V/15 V logic supply rails
UVLO Thresholds	V_CC: 10.1 V / V_BS: 8.8 V - Prevents erratic switching during bootstrap capacitor discharge
Propagation Delay Match	±5 ns - Ensures consistent turn-on/turn-off timing across multiple drivers in parallel

Pinout & Package

IRS21851SPBF is housed in an 8-pin SOIC package (SOIC-8, 150 mil width) with exposed thermal pad (EP). Pin 1 is marked by notch or dot; pin count and layout conform to JEDEC MS-012.

Pin/Terminal	Circuit Role	Design Meaning
V_DD	Logic supply input	Provides power to input logic and level shifter; decoupling required near pin
IN	CMOS/TTL-compatible input	Active-high signal controls high-side output; 3.3 V/5 V compatible
COM	Ground reference for low-side logic	Common return for V_DD and IN; must be tied to system ground
V_SS	Power ground for output stage	Return path for HO output current; separate from COM for noise isolation
HO	High-side gate driver output	Drives MOSFET gate referenced to floating VS node; capable of 600 V common-mode swing
V_BS	Bootstrap supply input	Accepts floating bootstrap voltage; internal diode charges external capacitor
VS	High-side source (switch node)	Reference point for HO output; swings from -5 V to 600 V relative to V_SS
NC	No connect	Internally unused; must remain unconnected per datasheet

Key Features

Feature	Design Value
Integrated bootstrap diode	Eliminates external diode, reducing BOM count and PCB footprint in half-bridge designs
Dual UVLO protection	Independent monitoring of V_CC and V_BS prevents shoot-through during bootstrap capacitor depletion
Matched propagation delays	Ensures <5 ns skew between input and HO edge, critical for PWM dead-time integrity
High dV/dt immunity	Withstands >50 V/ns common-mode transients on VS node without false triggering
Thermal shutdown	Internal protection activates above 150 °C junction temperature, preventing latch-up under overload

Applications

BLDC Motor Inverter

Industrial AC Drive

Use Scenario: Three-phase inverter stage driving 1–3 kW permanent magnet motors in HVAC compressors.

IC Role / Device Role / Timing Role: High-side gate driver for upper-leg N-MOSFETs; synchronized with complementary low-side drivers.

Use Value: 2.5 A drive strength ensures fast MOSFET turn-on (t_rise < 25 ns) at 20 kHz PWM, minimizing conduction losses.

Use Scenario: Voltage-source inverter in 7.5 kW variable-frequency drives for conveyor systems.

IC Role / Device Role / Timing Role: Floating high-side driver enabling 600 V DC bus operation with isolated gate control.

Use Value: 600 V V_BS rating allows direct use with 560 V DC link without external level-shifting circuitry.

Solar Microinverter

UPS Half-Bridge Stage

Use Scenario: Single-phase H-bridge in 300 W photovoltaic microinverters interfacing with 400 V DC string voltage.

IC Role / Device Role / Timing Role: High-side driver for top switch in interleaved half-bridge topology with synchronous rectification.

Use Value: Integrated bootstrap diode reduces component count and improves reliability over discrete bootstrap solutions.

Use Scenario: High-efficiency offline UPS with bidirectional half-bridge for battery charging and inverting.

IC Role / Device Role / Timing Role: High-side gate driver operating in both forward (inverting) and reverse (charging) modes.

Use Value: Dual UVLO ensures safe disable when bootstrap voltage drops below 8.8 V during extended low-line conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side gate driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
IR2110PbF	Higher 10 A peak drive, dual-channel (high + low), no integrated bootstrap diode	Requires external bootstrap diode and larger gate drive loop area	Preferred where higher drive current or dual-channel integration is needed
FAN7382MX	Lower 1.5 A peak drive, 500 V V_BS rating, no thermal shutdown	Limited to ≤350 V DC bus applications; lacks overtemperature protection	Suitable for cost-sensitive, lower-voltage consumer-grade inverters

Compared with IR2110PbF and FAN7382MX, IRS21851SPBF offers optimal balance of integrated bootstrap diode, 600 V rating, and thermal protection-making it ideal for compact, reliable 400–600 V industrial half-bridge designs without added components.

Availability

IRS21851SPBF is available at Aetrix Electronics and suitable for BLDC motor control, solar microinverters, and industrial AC drives requiring stable component supply and long-term production continuity.

Supply support for IRS21851SPBF 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 electronics, and industrial control ICs.

The IRS21851SPBF belongs to Infineon's high-voltage gate driver product line, engineered for robust, integrated half-bridge control in energy-efficient motor and power conversion systems.

FAQ

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

The IRS21851SPBF is rated for ±50 V/ns common-mode dV/dt on the VS pin. This specification ensures reliable operation without false triggering when switching 600 V bus voltages at high frequencies, provided PCB layout minimizes parasitic inductance in the VS return path and gate loop.

Can IRS21851SPBF drive SiC MOSFETs?

Yes, but with design constraints: its 2.5 A peak output can drive small- to medium-size SiC MOSFETs (≤20 nC Q_g), though gate resistor tuning is required to limit dv/dt. The 600 V rating supports most 650 V SiC devices, but thermal derating must be applied above 100 °C ambient due to reduced SOA at elevated temperatures.

Is an external bootstrap diode required?

No. The IRS21851SPBF integrates a bootstrap diode between V_DD and V_BS, eliminating the need for an external diode. This simplifies layout and improves reliability in space-constrained half-bridge designs, though a minimum 0.1 µF ceramic bootstrap capacitor is still required between V_BS and VS.

Does IRS21851SPBF support PWM frequency above 200 kHz?

Yes, up to 500 kHz under optimized conditions: propagation delay (15 ns) and rise/fall times (25 ns) support high-frequency operation, but gate drive strength and bootstrap capacitor recharge time become limiting factors above 200 kHz. At 500 kHz, a 0.22 µF low-ESR capacitor and minimal trace inductance are mandatory to maintain V_BS stability.

IRS21851SPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: High-Side

Channel Type:: Single

Number of Drivers:: 1

Gate Type:: IGBT, N-Channel MOSFET

Voltage - Supply:: 10V ~ 20V

Logic Voltage - VIL, VIH:: 0.8V, 2.5V

Current - Peak Output (Source, Sink):: 4A, 4A

Input Type:: Non-Inverting

High Side Voltage - Max (Bootstrap):: 600 V

Rise / Fall Time (Typ):: 15ns, 15ns

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

IRS21851SPBF FAQ

1.How can I place an order for IRS21851SPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRS21851SPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for IRS21851SPBF reliable?

The price and inventory of IRS21851SPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS21851SPBF is usually 5 days.

3.What payment methods are accepted for IRS21851SPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS21851SPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRS21851SPBF?

IRS21851SPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRS21851SPBF order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for IRS21851SPBF?

For technical support, including IRS21851SPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS21851SPBF requirements.

6.How does Aetrix verify that IRS21851SPBF is sourced from the original manufacturer or authorized distributors?

All IRS21851SPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IRS21851SPBF meets industry standards.

7.What is the process for return or replacement of IRS21851SPBF?

All IRS21851SPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS21851SPBF, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The IRS21851SPBF part is unused and in its original packaging.

Return procedure for IRS21851SPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…

2026-07-13 How to Test Dynamic Load Response in Low-Voltage High-Current Buck Converters

Engineering guide to dynamic load response testing for high-current buck converters, covering load step setup, slew rate, Vcore undershoot, overshoot, recovery time, probe location, output capacitors a…

2026-07-08 Output Capacitor Selection for High-Current ASIC Vcore Rails

Engineering guide to output capacitor selection for ASIC Vcore rails, covering bulk capacitors, polymer capacitors, MLCC decoupling, DC bias, ESR, ESL, placement, transient response and substitution ri…

2026-07-07 High-Current ASIC Core Power Supply Design: 12-Phase Buck, PMBus and Dynamic Load Response

Engineering guide to high-current ASIC Vcore rails, covering 12-phase buck architecture, PMBus control, dynamic load testing, output capacitor networks, smart power stage selection, thermal design and …

2026-07-06 Voltage Regulator: Types, Circuits, Testing and Selection Guide

Voltage regulator guide covering linear, LDO, 7805, Zener, adjustable, buck, VRM and alternator regulators, with design checks, testing methods, troubleshooting and datasheet-based selection.

2026-06-30 Amplifiers Explained: Types, Circuits, Gain, Classes and Applications

Amplifier guide covering voltage, current and power amplification, gain, feedback, amplifier classes, audio and RF applications, op-amp circuits, transimpedance amplifiers, datasheet selection and trou…