IR21531 Equivalent & Substitute Parts

Part Overview

The IR21531 is a half-bridge gate driver IC designed for synchronous N-channel MOSFET applications. It features RC input circuit configuration with dual-channel output capability, operating across a 10V to 15.6V supply voltage range. The device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design considerations.

Substiute Parts

IR21531

Infineon TechnologiesIn Stock: 1370IR21531 Datasheet

Current PartRFQ

IR21531PBF

Infineon TechnologiesIn Stock: 3889IR21531PBF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the IR21531 is determined by strict equivalence across the following critical parameters:

• Driven configuration (half-bridge topology)
• Channel type (synchronous operation)
• Number of drivers (dual-channel)
• Gate type (N-channel MOSFET)
• Supply voltage range (10V ~ 15.6V)
• Input circuit type (RC input)
• Bootstrap voltage rating (600V maximum)
• Switching characteristics (rise/fall times)
• Operating temperature range (-40°C ~ 125°C)
• Package form factor (8-DIP through-hole)

The IR21531PBF meets all these criteria and qualifies as a direct substitute based on identical electrical specifications and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The IR21531PBF is electrically and mechanically equivalent to the IR21531. Both devices share identical functional specifications across all critical parameters governing half-bridge gate driver operation.

The IR21531PBF offers improved compliance status: it is ROHS3 compliant, whereas the original IR21531 is RoHS non-compliant. This distinction is relevant for applications subject to regulatory requirements. The IR21531PBF is designated "Not For New Designs," indicating limited long-term availability, while the IR21531 is classified as obsolete.

For legacy system maintenance requiring the IR21531, the IR21531PBF provides direct functional replacement with superior environmental compliance. For new designs, alternative gate driver solutions outside the IR21531 family should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can IR21531PBF replace IR21531 in existing designs?

A: Yes. The IR21531PBF is electrically and mechanically equivalent. All electrical parameters, switching characteristics, and package specifications are identical. Direct substitution is supported without circuit modification.

Q: What is the difference between IR21531 and IR21531PBF?

A: The primary differences are product status and RoHS compliance. IR21531PBF is ROHS3 compliant and supplied in tube packaging, while IR21531 is RoHS non-compliant and supplied in bulk. Electrical and mechanical specifications are identical.

Q: Are there packaging considerations for substitution?

A: Both devices use 8-DIP through-hole packaging with identical pin configuration and footprint. Packaging format differs (tube vs. bulk), but this does not affect circuit compatibility or PCB mounting.

Q: Why is the IR21531 classified as obsolete?

A: Obsolescence reflects end-of-life status from the manufacturer. The IR21531PBF remains available but is designated "Not For New Designs," indicating limited future availability. Both devices share identical specifications.

Q: What supply voltage range does this gate driver support?

A: The IR21531 and IR21531PBF operate across 10V to 15.6V supply voltage. This range must be maintained in the application circuit for proper device operation.

Q: What is the maximum bootstrap voltage rating?

A: Both devices support a maximum high-side bootstrap voltage of 600V, which defines the maximum voltage differential the gate driver can withstand in half-bridge configurations.