IR21091SPBF Half-Bridge Gate Driver IC Equivalent & Substitute Parts

Part Overview

The IR21091SPBF is a half-bridge gate driver IC manufactured by Infineon Technologies, designed for driving IGBT and N-Channel MOSFET configurations in power management applications. This device operates with a supply voltage range of 10V to 20V and features non-inverting input logic with a maximum bootstrap voltage of 600V. The IR21091SPBF is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

IR21091SPBF

Infineon TechnologiesIn Stock: 1740IR21091SPBF Datasheet

Current PartRFQ

FAN7080MX-GF085

onsemiIn Stock: 5902FAN7080MX-GF085 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IR21091SPBF is determined by strict alignment of the following critical parameters:

Core Functional Requirements:

• Driven configuration must be half-bridge
• Channel type must be synchronous
• Number of drivers must be 2
• Gate type must support IGBT and N-Channel MOSFET
• Input type must be non-inverting
• Package must be 8-SOIC with identical physical dimensions

Electrical Compatibility Criteria:

• Supply voltage range must encompass or exceed 10V ~ 20V
• Logic voltage thresholds (VIL, VIH) must be compatible with 0.8V, 2.9V
• Peak output current (source and sink) must meet or exceed 200mA and 350mA respectively
• Bootstrap voltage rating must be 600V or higher
• Operating temperature range must cover -40°C ~ 150°C

Compliance Requirements:

• RoHS3 compliance required
• Surface mount mounting type

The FAN7080MX-GF085 from onsemi meets all substitution criteria and is classified as an active product with automotive-grade qualification (AEC-Q100).

Parameter Comparison

Engineering Selection Recommendations

The FAN7080MX-GF085 is a direct functional substitute for the obsolete IR21091SPBF. Selection is based on the following engineering criteria:

Product Availability: The IR21091SPBF is classified as obsolete, while the FAN7080MX-GF085 is an active product with 5852 units in stock, ensuring long-term supply continuity.

Functional Equivalence: Both devices share identical half-bridge gate driver architecture, synchronous channel configuration, 2-driver topology, and support for IGBT and N-Channel MOSFET gate types. Package dimensions are identical (8-SOIC), enabling direct PCB-level substitution without layout modifications.

Electrical Performance: The FAN7080MX-GF085 meets all electrical requirements of the IR21091SPBF with enhanced performance characteristics. Peak output current ratings (300mA source, 600mA sink) exceed the original specification (200mA source, 350mA sink). Switching times are faster (40ns rise, 25ns fall versus 150ns rise, 50ns fall), providing improved transient response in power conversion applications.

Supply Voltage Compatibility: The FAN7080MX-GF085 operates across 5.5V to 20V, encompassing the IR21091SPBF range of 10V to 20V. Logic voltage thresholds remain compatible (0.8V VIL, 2.7V VIH versus 0.8V VIL, 2.9V VIH).

Compliance and Qualification: Both devices are ROHS3 compliant. The FAN7080MX-GF085 carries AEC-Q100 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Thermal Performance: Operating temperature ranges are identical (-40°C to 150°C junction temperature), ensuring equivalent thermal performance across industrial and automotive temperature profiles.

Frequently Asked Questions (FAQ)

Q: Can the FAN7080MX-GF085 be used as a direct replacement for the IR21091SPBF without PCB modifications?

A: Yes. Both devices use identical 8-SOIC packaging with matching pin configurations and electrical interfaces. No PCB layout changes are required for substitution.

Q: Are there differences in logic voltage thresholds between these devices?

A: The IR21091SPBF specifies VIH at 2.9V, while the FAN7080MX-GF085 specifies 2.7V. Both maintain VIL at 0.8V. These thresholds are compatible with standard logic signal levels and do not affect circuit operation.

Q: Does the faster switching time of the FAN7080MX-GF085 affect circuit design?

A: The FAN7080MX-GF085 exhibits faster rise and fall times (40ns and 25ns respectively) compared to the IR21091SPBF (150ns and 50ns). This represents improved performance and does not require design modifications. Faster switching may reduce switching losses in power conversion stages.

Q: What is the significance of AEC-Q100 qualification on the FAN7080MX-GF085?

A: AEC-Q100 qualification indicates the device meets automotive industry reliability and quality standards. This certification is beneficial for applications requiring automotive-grade components but does not restrict use in non-automotive applications.

Q: Are both devices RoHS3 compliant?

A: Yes. Both the IR21091SPBF and FAN7080MX-GF085 are ROHS3 compliant, meeting environmental and regulatory requirements for lead-free manufacturing.

Q: What is the difference in peak output current capability?

A: The IR21091SPBF provides 200mA source and 350mA sink current. The FAN7080MX-GF085 provides 300mA source and 600mA sink current. The substitute device offers higher current capability, which is beneficial for driving larger gate capacitances or multiple parallel MOSFETs.

Q: Can the FAN7080MX-GF085 operate at supply voltages below 10V?

A: The FAN7080MX-GF085 operates from 5.5V to 20V, allowing operation below the IR21091SPBF minimum of 10V. However, circuit design must ensure proper gate drive voltage levels are maintained across the intended supply voltage range.