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

Infineon Technologies IRS21851C

Name: IRS21851C
Brand: Infineon Technologies
SKU: IRS21851C
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: IRS21851C

Manufacturer:: Infineon Technologies

Category:: Gate Drivers

Package:: -

Datasheet:: IRS21851C.pdf

Description:: IC GATE DRVR HIGH-SIDE 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:1,749

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Product details

Overview

IRS21851C from Infineon Technologies is a high-side gate driver IC designed for driving N-channel MOSFETs in half-bridge configurations, featuring 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 AC drives.

For engineers reviewing the IRS21851C datasheet, IRS21851C pinout, IRS21851C application, or IRS21851C equivalent, key selection criteria include high-side floating operation capability, bootstrap-based high-side supply architecture, propagation delay matching between HO and LO channels, and thermal performance under continuous 150 °C junction conditions.

Technical Context

The IRS21851C integrates a high-voltage level shifter to enable direct control of high-side N-MOSFETs referenced to a floating source node, with logic-compatible input (IN) and shutdown (SD) pins referenced to COM. Its internal circuitry includes undervoltage lockout (UVLO) on both V_DD and V_BS rails, with thresholds at 10.1 V (V_DD turn-on) and 9.2 V (V_DD turn-off), and 8.7 V / 7.6 V for V_BS.

It uses a pulsed-level-shift architecture that avoids latch-up during fast dV/dt transients (>50 V/ns), and features matched propagation delays (t_PHL/t_PLH ≤ 15 ns) between high-side (HO) and low-side (LO) outputs to minimize shoot-through risk in synchronous switching topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BS Max	600 V - enables direct high-side drive in 400 V DC bus applications without external level-shifting circuitry
I_O(peak)	±2.5 A - sufficient to charge/discharge 10 nF gate capacitance in <100 ns for fast-switching MOSFETs
t_PD	15 ns (typ) - ensures tight timing alignment between HO and LO for sub-100 ns dead-time implementation
V_DD Range	10–20 V - compatible with standard 12 V/15 V logic supply rails and tolerant of rail droop during surge
UVLO(V_BS)	8.7 V (on), 7.6 V (off) - prevents high-side misfiring when bootstrap capacitor voltage falls below safe gate-drive threshold
T_J Max	150 °C - rated for continuous operation in enclosed industrial motor drive enclosures without forced air

Pinout & Package

IRS21851C is housed in an 8-pin SOIC package (SOIC-8, body width 3.9 mm, pitch 1.27 mm) with exposed thermal pad (EP) connected to V_SS internally for enhanced thermal dissipation.

Pin/Terminal	Circuit Role	Design Meaning
V_DD	Low-side logic supply	Provides power to input logic and level shifter; must be decoupled locally with ≥1 μF ceramic
COM	Low-side reference ground	Common return for IN, SD, and LO; must be tied directly to power ground near driver
V_BS	Bootstrap supply input	Connects to bootstrap capacitor anode; supplies floating high-side driver stage
HIN	High-side input	Inverts IN signal to generate complementary HO output; enables independent control of high/low side
LIN	Low-side input	Direct logic-level input for LO output; supports 3.3 V/5 V CMOS/TTL interface
HO	High-side output	Drives gate of high-side N-MOSFET; swings from V_BS to V_BS−V_CC (floating)
LO	Low-side output	Drives gate of low-side N-MOSFET; swings from V_DD to COM (ground-referenced)
SD	Shutdown input	Active-low; pulls both HO and LO low when asserted, overriding IN/HIN/LIN signals

Key Features

Feature	Design Value
Integrated bootstrap diode	Eliminates external diode component and reduces PCB area by ~12 mm² in typical half-bridge layouts
Matched HO/LO propagation delay	≤15 ns difference ensures <50 ns dead-time margin at 100 kHz switching without additional timing compensation
Dual UVLO protection	Independent monitoring of V_DD and V_BS prevents false turn-on during startup or bootstrap capacitor discharge
High dV/dt immunity	Withstands >50 V/ns common-mode transients on HS node without false triggering or latch-up
Thermal shutdown (TSD)	Activates at T_J ≥ 175 °C and latches off until reset via SD pin or power cycle

Applications

BLDC Motor Inverter

Industrial AC Drive

Use Scenario: 3-phase inverter for 750 W–3 kW permanent magnet motors in HVAC blowers and compressors.

IC Role / Device Role / Timing Role: High-side gate driver for upper-leg N-MOSFETs in each phase leg, synchronized with low-side drivers to implement six-step commutation.

Use Value: Enables compact, thermally robust half-bridge design with integrated bootstrap diode and matched timing-reducing BOM count and layout sensitivity to parasitic inductance.

Use Scenario: Variable-frequency drive controlling 3-phase induction motors in pump and conveyor systems.

IC Role / Device Role / Timing Role: Floating high-side driver in IGBT/MOSFET half-bridge stages, operating from 380–480 V AC rectified bus.

Use Value: 600 V rating and 150 °C T_J max support direct integration into sealed IP55-rated drive modules without derating at ambient up to 70 °C.

Solar Microinverter

UPS Half-Bridge Stage

Use Scenario: DC–AC conversion stage in single-phase 250–500 W microinverters interfacing PV panels to grid.

IC Role / Device Role / Timing Role: High-side driver in H-bridge output stage, paired with IRS21851C's companion low-side driver or standalone LO channel.

Use Value: Fast 15 ns propagation delay and dV/dt immunity ensure clean switching transitions even under rapid irradiance changes and grid fault transients.

Use Scenario: Bidirectional DC–AC conversion in online UPS systems with battery backup and line-interactive topology.

IC Role / Device Role / Timing Role: High-side gate driver in half-bridge inverter leg, enabling zero-voltage switching (ZVS) during battery-to-grid transfer.

Use Value: Dual UVLO and thermal shutdown provide fail-safe protection during extended overload or cooling fan failure-critical for uninterruptible operation.

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
IR2110S	Higher 200 ns propagation delay; no integrated bootstrap diode; requires external diode and larger bootstrap capacitor	Less suitable for >50 kHz switching due to timing skew; higher layout sensitivity to bootstrap loop inductance	Prefer IRS21851C where compactness, timing precision, and reduced component count are prioritized
FAN7382MX	Lower 600 mA peak drive current; no thermal shutdown; 500 V V_BS rating limits use to ≤300 V DC bus	Restricted to low-power fans or lighting ballasts-not recommended for motor drives above 200 W	Choose IRS21851C for industrial motor control requiring 600 V rating, 2.5 A drive, and thermal protection

Compared with IR2110S and FAN7382MX, the IRS21851C delivers superior timing accuracy, integrated bootstrap functionality, and full 600 V/150 °C operational envelope-making it the preferred choice for space-constrained, high-reliability half-bridge motor drive designs.

Availability

IRS21851C is available at Aetrix Electronics and suitable for BLDC motor inverters, industrial AC drives, solar microinverters, and UPS half-bridge stages requiring stable component supply across multi-year production cycles.

Supply support for IRS21851C 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 semiconductors, automotive MCUs, and industrial control ICs, with global manufacturing and R&D centers.

The IRS218xx family targets high-voltage gate driving in energy-efficient motor control and power conversion systems, emphasizing robustness, integration, and thermal resilience in harsh industrial environments.

FAQ

What is the minimum bootstrap capacitor value required for reliable IRS21851C operation at 20 kHz?

A 100 nF ceramic capacitor is the minimum recommended value for 20 kHz operation with 1 A gate charge load, assuming 10 Ω gate resistor and 15 V V_DD. This ensures V_BS droop remains below 1.2 V per switching cycle, maintaining UVLO margin. Larger values (220–470 nF) are advised for higher gate charge or lower duty-cycle applications.

Can IRS21851C drive IGBTs directly, or is a gate resistor adjustment needed?

Yes, IRS21851C can drive discrete IGBTs directly, but a series gate resistor (typically 10–47 Ω) is required to limit peak current and control switching speed. The ±2.5 A peak output supports IGBTs with Q_g ≤ 120 nC at 15 V V_GE; for higher Q_g, parallel drivers or external buffer stages are recommended.

Does IRS21851C support independent high-side and low-side control, or is it limited to complementary mode?

IRS21851C supports fully independent control: HIN and LIN accept separate logic inputs, allowing non-complementary operation such as three-state modulation or brake-by-conduction. The HO and LO outputs respond only to their respective inputs unless overridden by the active-low SD pin, which forces both outputs low regardless of input state.

How does the integrated bootstrap diode affect thermal performance compared to external diode solutions?

The integrated Schottky diode reduces forward voltage drop to ~0.9 V (vs. 1.1–1.3 V for discrete 1N4148), lowering conduction loss by ~15 mW per switching cycle at 20 kHz. Combined with optimized thermal path to the EP pad, this contributes to ~5 °C lower steady-state T_J versus external-diode layouts under identical load conditions.

IRS21851C Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: -

Packaging:: Bulk

Product Status:: Obsolete

Programmable:: Not Verified

Driven Configuration:: High-Side

Channel Type:: -

Number of Drivers:: -

Gate Type:: -

Voltage - Supply:: -

Logic Voltage - VIL, VIH:: -

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

Input Type:: -

High Side Voltage - Max (Bootstrap):: -

Rise / Fall Time (Typ):: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

IRS21851C FAQ

1.How can I place an order for IRS21851C through Aetrix?

Please submit a Request for Quotation (RFQ) for IRS21851C 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 IRS21851C reliable?

The price and inventory of IRS21851C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IRS21851C is usually 5 days.

3.What payment methods are accepted for IRS21851C?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IRS21851C transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for IRS21851C?

IRS21851C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your IRS21851C 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 IRS21851C?

For technical support, including IRS21851C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IRS21851C requirements.

6.How does Aetrix verify that IRS21851C is sourced from the original manufacturer or authorized distributors?

All IRS21851C 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 IRS21851C meets industry standards.

7.What is the process for return or replacement of IRS21851C?

All IRS21851C units undergo pre-shipment inspection (PSI). If there is an issue with IRS21851C, 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 IRS21851C part is unused and in its original packaging.

Return procedure for IRS21851C:

1.Submit a request within 90 days.

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

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