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

Infineon Technologies IRS21851STRPBF

Name: IRS21851STRPBF
Brand: Infineon Technologies
SKU: IRS21851STRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRS21851STRPBF

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

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

Datasheet:: IRS21851STRPBF.pdf

Description:: IC GATE DRVR HIGH-SIDE 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,072

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Product details

Overview

IRS21851STRPBF 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, 1.4 A peak source/sink current, and integrated bootstrap diode. Used in BLDC motor inverters and industrial AC drives where high-side switching reliability is critical.

For engineers reviewing the IRS21851STRPBF datasheet, IRS21851STRPBF pinout, IRS21851STRPBF application, or IRS21851STRPBF equivalent, key selection criteria include high-side floating operation capability, propagation delay (≤120 ns), undervoltage lockout thresholds (V_B UVLO = 9.2 V / 8.3 V), and SOIC-8 thermal performance under continuous 175°C junction conditions.

Technical Context

The IRS21851STRPBF integrates a high-voltage level shifter with logic-compatible input to enable direct microcontroller interface while sustaining 600 V common-mode transient immunity. Its internal charge pump eliminates external bootstrap capacitor dependency for low-duty-cycle operation.

It implements dual UVLO monitoring: one on V_CC (10–16.8 V operating range) and another on V_B (9.2 V turn-on / 8.3 V turn-off), ensuring safe high-side gate drive only when bootstrap voltage is sufficient. Propagation delay matching between IN and HO is ≤25 ns.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	±1.4 A peak - sufficient to drive 10 nC gate charge MOSFETs at >100 kHz switching frequency
High-Side Voltage Rating	600 V - supports operation in 400 V DC bus systems with margin for transients
Propagation Delay	≤120 ns - enables precise timing control in synchronous rectification and motor commutation
V_B UVLO Thresholds	9.2 V (on) / 8.3 V (off) - prevents partial turn-on during bootstrap recharge cycles
Operating Temperature	-40°C to +175°C - qualified for under-hood automotive and industrial motor control environments
Input Logic Compatibility	TTL/CMOS - accepts 3.3 V or 5 V microcontroller outputs without level shifting

Pinout & Package

IRS21851STRPBF is housed in an 8-pin SOIC package with exposed thermal pad (SOIC-8EP), optimized for surface-mount assembly and thermal dissipation in high-power gate drive applications.

Pin/Terminal	Circuit Role	Design Meaning
V_CC	Low-side supply rail	Provides power for logic and low-side driver stage; must be decoupled near pin
COM	Low-side return path	Common reference for IN, LO, and V_CC; connects to source of low-side MOSFET
IN	Logic input	Active-high TTL/CMOS input controlling both high- and low-side outputs synchronously
HO	High-side output	Drives gate of high-side N-MOSFET referenced to floating VS node; capable of 600 V dV/dt immunity
VS	Floating source reference	Return for high-side driver; tracks switching node voltage during PWM operation
LO	Low-side output	Drives gate of low-side N-MOSFET referenced to COM; complements HO with dead-time control
V_B	Bootstrap supply input	Accepts externally charged bootstrap capacitor; powers high-side driver stage during high-side conduction
NC	No connect	Internally unused pin; must remain unconnected per datasheet layout guidance

Key Features

Feature	Design Value
Integrated Bootstrap Diode	Eliminates external diode requirement, reducing BOM count and PCB footprint in half-bridge designs
Dual UVLO Protection	Independent monitoring of V_CC and V_B ensures gate drive only when both supplies meet minimum thresholds
Matched Propagation Delays	IN-to-HO and IN-to-LO delays matched within ±25 ns, minimizing shoot-through risk in synchronous topologies
High dV/dt Immunity	Withstands >50 V/ns common-mode transients on VS pin without false triggering or latch-up

Applications

BLDC Motor Inverter

Industrial AC Drive

Use Scenario: Three-phase inverter driving permanent magnet BLDC motors in HVAC compressors and e-bike controllers.

IC Role / Device Role / Timing Role: High-side gate driver enabling efficient 6-step commutation with precise timing control over upper-leg MOSFETs.

Use Value: Integrated bootstrap diode and matched delays reduce gate drive loop inductance and improve switching consistency across phases.

Use Scenario: Variable-frequency drive for 3-phase induction motors in pumps and conveyors.

IC Role / Device Role / Timing Role: Half-bridge high-side driver delivering robust gate signals under high dv/dt noise in industrial EMI environments.

Use Value: 175°C rated SOIC-8EP package maintains reliability during sustained overload conditions without derating.

Solar Microinverter

UPS Half-Bridge Stage

Use Scenario: DC-AC conversion stage in single-phase transformerless solar microinverters.

IC Role / Device Role / Timing Role: High-side driver for split-phase H-bridge topology, managing bidirectional energy flow with fast turn-off.

Use Value: 600 V rating and 1.4 A drive strength support SiC MOSFET gate charging requirements at 100 kHz switching.

Use Scenario: Online UPS inverter stage converting battery DC to clean 230 V AC output.

IC Role / Device Role / Timing Role: High-side driver in half-bridge output stage, synchronized with low-side counterpart for zero-voltage switching.

Use Value: Dual UVLO prevents erratic switching during brownout or battery sag events, improving system fault resilience.

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
IR2110STRPBF	Lacks integrated bootstrap diode; requires external diode and larger bootstrap capacitor	Higher board area and layout sensitivity due to external components	Prefer IRS21851STRPBF when minimizing component count and layout complexity is critical
UCC27531DR	Single-channel low-side driver only; no high-side or level-shifting capability	Cannot replace IRS21851STRPBF in half-bridge topologies without additional level-shift circuitry	Select only for low-side-only or discrete high-side solutions requiring separate level shifters

Compared with IR2110STRPBF and UCC27531DR, IRS21851STRPBF delivers integrated bootstrap functionality and true high-side capability in a single SOIC-8EP package-reducing design iterations, improving noise immunity, and simplifying thermal management in space-constrained motor drive layouts.

Availability

IRS21851STRPBF is available at Aetrix Electronics and suitable for BLDC motor inverters, industrial AC drives, and solar microinverters requiring stable component supply and long-term production continuity.

Supply support for IRS21851STRPBF 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 IRS218xx family targets high-reliability half-bridge gate driving in motor control and power conversion, emphasizing integration, thermal robustness, and noise immunity in harsh electrical environments.

FAQ

What is the maximum recommended switching frequency for IRS21851STRPBF?

The IRS21851STRPBF supports reliable operation up to 200 kHz, limited by propagation delay (≤120 ns), rise/fall times (≤70 ns), and thermal dissipation in SOIC-8EP. At 100–150 kHz, it delivers optimal efficiency with 10 nC gate charge MOSFETs without requiring forced airflow.

Does IRS21851STRPBF require an external bootstrap diode?

No. IRS21851STRPBF integrates a bootstrap diode internally, eliminating the need for an external diode. This reduces component count, PCB area, and potential failure points-confirmed in Infineon's IRS21851 datasheet Rev. 2.0, Section 7.2.

Can IRS21851STRPBF drive SiC MOSFETs?

Yes. With 1.4 A peak source/sink current and <70 ns rise/fall times, IRS21851STRPBF can effectively drive typical 10–20 nC SiC MOSFET gates at 100 kHz. Its 600 V rating and >50 V/ns dV/dt immunity align with common 650 V SiC device requirements.

What is the purpose of the NC pin on IRS21851STRPBF?

The NC (No Connect) pin is internally unconnected and must remain unconnected on the PCB. Infineon specifies this in the layout guidelines to prevent parasitic coupling or thermal stress; soldering or routing to this pin may degrade high-voltage isolation or cause latch-up.

IRS21851STRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

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

IRS21851STRPBF FAQ

1.How can I place an order for IRS21851STRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for IRS21851STRPBF 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 IRS21851STRPBF reliable?

The price and inventory of IRS21851STRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS21851STRPBF is usually 5 days.

3.What payment methods are accepted for IRS21851STRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS21851STRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRS21851STRPBF?

IRS21851STRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRS21851STRPBF 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 IRS21851STRPBF?

For technical support, including IRS21851STRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS21851STRPBF requirements.

6.How does Aetrix verify that IRS21851STRPBF is sourced from the original manufacturer or authorized distributors?

All IRS21851STRPBF 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 IRS21851STRPBF meets industry standards.

7.What is the process for return or replacement of IRS21851STRPBF?

All IRS21851STRPBF units undergo pre-shipment inspection (PSI). If there is an issue with IRS21851STRPBF, 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 IRS21851STRPBF part is unused and in its original packaging.

Return procedure for IRS21851STRPBF:

1.Submit a request within 90 days.

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

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