FDZ8040L Equivalent & Substitute Parts

Part Overview

The FDZ8040L is a Power Switch/Driver IC manufactured by onsemi, designed as a P-Channel 1:1 high-side switch with 1.2A output capability in a 4-WLCSP (0.8x0.8mm) package. This component operates across a load voltage range of 0.8V to 4V and includes load discharge functionality. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

FDZ8040L

onsemiIn Stock: 833FDZ8040L Datasheet

Current PartRFQ

TPS22903YFPR

Texas InstrumentsIn Stock: 3497TPS22903YFPR Datasheet

SimilarRFQ

TPS22904YFPR

Texas InstrumentsIn Stock: 17503TPS22904YFPR Datasheet

SimilarRFQ

TPS22904YFPT

Texas InstrumentsIn Stock: 2195TPS22904YFPT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FDZ8040L is determined by the following critical parameters:

• Output Type & Configuration: P-Channel, High Side, 1:1 ratio
• Interface & Control: On/Off control with Non-Inverting input
• Electrical Performance: Output current capability and load voltage range
• Package Form Factor: Surface mount BGA variants
• Operating Temperature Range: -40°C to 85°C
• Functional Features: Load discharge capability

The Texas Instruments TPS2290x series (TPS22903YFPR, TPS22904YFPR, TPS22904YFPT) meets these core substitution criteria. All candidates maintain P-Channel high-side switching architecture with 1:1 input-output ratio, On/Off control interface, and identical operating temperature specifications. However, output current ratings differ: the FDZ8040L provides 1.2A, while TPS2290x variants deliver 500mA. This represents a functional limitation in substitute selection and must be evaluated against application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes: TPS22904YFPR and TPS22904YFPT

The TPS22904 series represents the most suitable substitution path for the FDZ8040L. Both variants maintain active product status with ROHS3 compliance and REACH unaffected certification. TPS22904YFPR is supplied in Cut Tape (CT) & Digi-Reel® packaging with 17,400 units in stock, while TPS22904YFPT is supplied in Tape & Reel (TR) format with 2,096 units available. Both deliver identical electrical specifications including 500mA output current, 66mOhm typical on-resistance, and integrated load discharge with slew rate control features.

Secondary Substitute: TPS22903YFPR

The TPS22903YFPR provides an alternative from the same Texas Instruments family with 3,413 units in stock. This part is classified as obsolete but maintains the same electrical architecture and operating temperature range. It differs by omitting integrated load discharge functionality, providing only slew rate control. This variant is suitable only when load discharge is not a design requirement.

Critical Design Consideration

All Texas Instruments substitutes deliver 500mA maximum output current compared to the FDZ8040L's 1.2A specification. Applications requiring the full 1.2A output capability cannot use these substitutes without circuit redesign or parallel device configuration. Load voltage range narrows from 0.8V–4V to 1.1V–3.6V, eliminating sub-1.1V operation capability.

Frequently Asked Questions (FAQ)

Q: Can TPS22904YFPR directly replace FDZ8040L in existing designs?

A: Electrical substitution is possible only if application load current does not exceed 500mA and operating voltage remains within 1.1V–3.6V. Package form factors differ (4-DSBGA vs. 4-WLCSP), requiring PCB layout evaluation. Both parts maintain identical On/Off control interface and operating temperature range.

Q: What is the difference between TPS22904YFPR and TPS22904YFPT?

A: Both variants are electrically identical with 500mA output, 66mOhm on-resistance, and active product status. The distinction is packaging format: YFPR uses Cut Tape & Digi-Reel supply, while YFPT uses Tape & Reel supply. Selection depends on procurement and assembly requirements.

Q: Why does TPS22903YFPR lack load discharge functionality?

A: TPS22903YFPR implements slew rate control only, omitting the integrated load discharge feature present in TPS22904 variants. This represents a functional subset suitable for applications where controlled power-down discharge is not required.

Q: Are all substitutes RoHS and REACH compliant?

A: Yes. All Texas Instruments substitutes (TPS22903YFPR, TPS22904YFPR, TPS22904YFPT) are ROHS3 compliant and REACH unaffected. The original FDZ8040L RoHS status is not specified in available documentation.

Q: What is the impact of reduced output current on system design?

A: The 500mA maximum output of TPS2290x variants represents a 58% reduction from FDZ8040L's 1.2A capability. Applications exceeding 500mA load current require either circuit redesign, parallel device configuration, or identification of alternative high-current P-Channel switch solutions outside this product family.

Q: How do package differences affect PCB implementation?

A: FDZ8040L uses 4-WLCSP (0.8x0.8mm) while substitutes use 4-DSBGA packaging. Both are 4-pin BGA variants with identical pin count and functional mapping. PCB footprint and thermal management characteristics differ; layout validation is required before production implementation.