TPS40020PWPRG4 Equivalent & Substitute Parts

Part Overview

The TPS40020PWPRG4 is a Buck Regulator Positive Output Step-Down DC-DC Controller IC manufactured by Texas Instruments in a 16-HTSSOP package. This device functions as a transistor driver for step-down topology applications with a single output phase. The part is currently classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Substiute Parts

TPS40020PWPRG4

Texas InstrumentsIn Stock: 717TPS40020PWPRG4 Datasheet

Current PartRFQ

TPS40303DRCR

Texas InstrumentsIn Stock: 27137TPS40303DRCR Datasheet

MFR RecommendedRFQ

TPS40021MPWPEP

Texas InstrumentsIn Stock: 984TPS40021MPWPEP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TPS40020PWPRG4 is determined by alignment across the following critical parameters:

Topology & Function: All substitute parts must maintain buck regulator topology with positive output step-down DC-DC controller functionality and transistor driver output type.

Electrical Specifications: Supply voltage range, switching frequency capability, duty cycle maximum, and control feature set are primary determinants of functional equivalence.

Package & Mounting: Physical package compatibility affects PCB layout and thermal performance. The 16-HTSSOP package is a key constraint for direct pin-compatible substitution.

Product Status & Compliance: Active product status ensures long-term availability. RoHS3 compliance and MSL ratings must be maintained for manufacturing and environmental requirements.

Two substitute parts are identified based on these criteria, each offering different trade-offs in package form factor and electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

TPS40021MPWPEP is the primary substitute for direct replacement of the TPS40020PWPRG4. This part maintains identical package form factor (16-PowerTSSOP), electrical specifications (2.25V ~ 5.5V supply, 100kHz ~ 1MHz switching frequency, 95% duty cycle), and control feature set. The TPS40021MPWPEP is an active product with extended operating temperature range (-55°C ~ 125°C junction temperature versus -40°C ~ 85°C ambient for the original part), providing improved thermal performance margin. Both parts are ROHS3 compliant with matching MSL ratings.

TPS40303DRCR serves as an alternative substitute when package constraints permit redesign. This part operates across a wider supply voltage range (3V ~ 20V) and extended temperature range (-40°C ~ 125°C), making it suitable for applications requiring higher input voltage capability. The 10-VFDFN package represents a smaller footprint alternative. However, this substitute differs in switching frequency (fixed 300kHz versus programmable 100kHz ~ 1MHz), maximum duty cycle (90% versus 95%), clock synchronization capability (not available), and control feature set (lacks current limit and frequency control). These differences require circuit redesign and are not suitable for direct pin-compatible replacement.

Frequently Asked Questions (FAQ)

Q: Can TPS40021MPWPEP be used as a direct replacement for TPS40020PWPRG4?

A: Yes. The TPS40021MPWPEP maintains identical package (16-PowerTSSOP), supply voltage range (2.25V ~ 5.5V), switching frequency range (100kHz ~ 1MHz), duty cycle maximum (95%), and control feature set. Pin-compatible substitution is supported without circuit modification.

Q: What are the key differences between TPS40021MPWPEP and TPS40303DRCR?

A: TPS40021MPWPEP is a pin-compatible replacement with identical electrical specifications. TPS40303DRCR requires circuit redesign due to differences in package (10-VFDFN versus 16-PowerTSSOP), fixed switching frequency (300kHz), reduced duty cycle (90%), absence of clock sync and current limit features, and wider supply voltage range (3V ~ 20V). Use TPS40303DRCR only when these differences align with application requirements.

Q: Does package change affect thermal performance?

A: Yes. The 16-PowerTSSOP package (0.173" width, 4.40mm) differs from the 10-VFDFN package in thermal characteristics and PCB layout requirements. Thermal analysis is required if switching to TPS40303DRCR.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both TPS40021MPWPEP and TPS40303DRCR are ROHS3 compliant with MSL rating 2 (1 Year), matching the original TPS40020PWPRG4 specifications.

Q: What is the operating temperature difference between substitutes?

A: TPS40020PWPRG4 operates -40°C ~ 85°C (ambient). TPS40021MPWPEP and TPS40303DRCR both operate -40°C ~ 125°C (junction temperature), providing extended thermal margin for demanding applications.

Q: Can frequency control be maintained with TPS40303DRCR?

A: No. TPS40303DRCR operates at fixed 300kHz switching frequency without programmable frequency control or clock synchronization capability. Applications requiring frequency adjustment must use TPS40021MPWPEP.