FX021 Half Bridge Driver Equivalent & Substitute Parts

Part Overview

The FX021 is a half bridge driver IC from Texas Instruments designed for synchronous buck converter applications. It integrates power MOSFET gate drive functionality with a 25A output capability per channel and peak output current of 60A. The device operates across a supply voltage range of 4.5V to 5.5V and supports load voltages from 4.5V to 24V, making it suitable for intermediate power conversion stages in industrial and consumer applications.

The FX021 carries a product status of "Not For New Designs," indicating that Texas Instruments has discontinued active development and support for this part number. This status necessitates identification of functionally equivalent alternatives that maintain compatibility with existing designs while offering active manufacturer support and improved availability.

Substiute Parts

FX021

Texas InstrumentsIn Stock: 772FX021 Datasheet

Current PartRFQ

CSD97395Q4M

Texas InstrumentsIn Stock: 10161CSD97395Q4M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FX021 is determined by strict equivalence across the following critical parameters:

Electrical Compatibility:

• Output configuration must be half bridge topology
• Current rating per channel must be 25A minimum
• Peak output current must be 60A minimum
• Supply voltage range must encompass 4.5V to 5.5V
• Load voltage range must encompass 4.5V to 24V
• Operating temperature range must cover -40°C to 150°C

Mechanical & Package Compatibility:

• Package type must be 8-PowerVFDFN (8-VSON 4.6x4.5)
• Mounting type must be surface mount
• Pin configuration and footprint must be identical

Functional Compatibility:

• Interface must support PWM control
• Load type must support inductive switching
• Fault protection must include shoot-through and UVLO functions
• Bootstrap circuit functionality must be present

Compliance & Support:

• RoHS3 compliance required
• MSL rating of 2 or better
• Active product status preferred for new procurement

The CSD97395Q4M meets all substitution criteria and is classified as a manufacturer-recommended equivalent.

Parameter Comparison

Engineering Selection Recommendations

The CSD97395Q4M is the direct functional equivalent of the FX021 and is suitable for direct substitution in synchronous buck converter applications. Both devices are manufactured by Texas Instruments within the NexFET™ series and share identical electrical specifications, package geometry, and fault protection architecture.

The primary advantage of selecting CSD97395Q4M over FX021 is product status. The CSD97395Q4M maintains active product status with Texas Instruments, ensuring continued manufacturer support, technical documentation updates, and long-term availability. The FX021, designated as "Not For New Designs," indicates end-of-life status and potential supply constraints.

Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with modern manufacturing processes and storage requirements. The CSD97395Q4M is available in higher inventory quantities (10,100 pieces versus 754 pieces for FX021), supporting both immediate procurement needs and long-term supply chain planning.

For designs currently using FX021, migration to CSD97395Q4M requires no circuit modifications, PCB layout changes, or firmware adjustments. Pin-for-pin compatibility and identical electrical performance ensure drop-in replacement capability.

Frequently Asked Questions (FAQ)

Q: Can CSD97395Q4M be used as a direct replacement for FX021 in existing designs?

A: Yes. The CSD97395Q4M is pin-for-pin compatible with FX021 and exhibits identical electrical specifications across all critical parameters including output current, voltage ratings, operating temperature range, and fault protection features. No circuit modifications are required.

Q: What is the difference between FX021 and CSD97395Q4M?

A: The devices are electrically and functionally equivalent. The primary difference is product status: FX021 is designated "Not For New Designs" (end-of-life), while CSD97395Q4M maintains active status. CSD97395Q4M also offers significantly higher inventory availability.

Q: Are the packages identical?

A: Yes. Both devices use the 8-PowerVFDFN package with dimensions of 4.6mm x 4.5mm (8-VSON). PCB footprints are identical, and no layout modifications are necessary.

Q: Do both parts support the same voltage and current specifications?

A: Yes. Both FX021 and CSD97395Q4M operate with identical supply voltage (4.5V to 5.5V), load voltage (4.5V to 24V), output current per channel (25A), and peak output current (60A) specifications.

Q: What are the compliance certifications for CSD97395Q4M?

A: CSD97395Q4M is ROHS3 compliant and carries an MSL rating of 2 (1 Year), matching the compliance profile of FX021.

Q: Is CSD97395Q4M available in the same packaging options as FX021?

A: CSD97395Q4M is available in Cut Tape (CT) and Digi-Reel® packaging, while FX021 is supplied in Tape & Reel (TR). Both packaging formats are suitable for automated assembly processes. Verify packaging availability with your supplier based on production volume requirements.