TPS40020PWPR Equivalent & Substitute Parts

Part Overview

The TPS40020PWPR 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 TPS40020PWPR is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production support. Substitute parts must maintain functional compatibility across power management specifications, control features, and thermal operating ranges.

Substiute Parts

TPS40020PWPR

Texas InstrumentsIn Stock: 2184TPS40020PWPR 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 logic for the TPS40020PWPR is based on the following critical parameters: buck topology function, positive output configuration, single output phase, transistor driver output type, and control feature set. Substitute parts must support the specified voltage supply range, switching frequency capability, duty cycle maximum, and synchronous rectification requirement.

Two substitute parts are identified based on these criteria:

TPS40021MPWPEP — Direct functional equivalent with identical package (16-HTSSOP), matching voltage supply range (2.25V ~ 5.5V), switching frequency range (100kHz ~ 1MHz), duty cycle maximum (95%), and control feature set. Active product status with extended operating temperature range (-55°C ~ 125°C TJ).

TPS40303DRCR — Functional equivalent with different package (10-VSON 3x3) and modified electrical specifications. Supports buck topology with positive output, but operates at fixed 300kHz switching frequency, reduced duty cycle maximum (90%), and narrower voltage supply range (3V ~ 20V). Reduced control feature set (Enable, Power Good, Soft Start only; no Current Limit or Frequency Control). Active product status with extended operating temperature range (-40°C ~ 125°C TJ).

Parameter Comparison

Engineering Selection Recommendations

TPS40021MPWPEP is the primary substitute for the obsolete TPS40020PWPR. This part maintains identical electrical specifications, package form factor, and control feature set. The TPS40021MPWPEP is an active product with extended operating temperature range, providing superior thermal performance. ROHS3 compliance and MSL rating are equivalent. Selection of this part requires no circuit redesign and supports direct board-level replacement.

TPS40303DRCR is a secondary substitute applicable only when circuit design permits accommodation of modified electrical specifications. This part operates at a fixed 300kHz switching frequency (versus the programmable 100kHz ~ 1MHz range of the main part), reducing design flexibility for frequency optimization. The reduced duty cycle maximum (90% versus 95%) and narrower voltage supply range (3V ~ 20V versus 2.25V ~ 5.5V) impose additional design constraints. The absence of current limit and frequency control features eliminates control options present in the original design. Package change from 16-PowerTSSOP to 10-VFDFN requires PCB layout modification. This substitute is suitable only for applications where these electrical and mechanical constraints are acceptable.

Frequently Asked Questions (FAQ)

Q: Can TPS40021MPWPEP directly replace TPS40020PWPR without circuit modification?

A: Yes. The TPS40021MPWPEP maintains identical voltage supply range (2.25V ~ 5.5V), switching frequency range (100kHz ~ 1MHz), duty cycle maximum (95%), synchronous rectification, clock sync capability, and complete control feature set (Current Limit, Enable, Frequency Control, Power Good, Soft Start). Package form factor is identical (16-PowerTSSOP). Direct substitution is supported at the component level.

Q: What are the key differences between TPS40303DRCR and the original TPS40020PWPR?

A: TPS40303DRCR differs in four critical areas: (1) Fixed 300kHz switching frequency versus programmable 100kHz ~ 1MHz range, eliminating frequency optimization capability; (2) Reduced maximum duty cycle of 90% versus 95%; (3) Wider voltage supply range (3V ~ 20V) but narrower minimum threshold (3V versus 2.25V); (4) Reduced control feature set lacking Current Limit and Frequency Control functions; (5) Different package (10-VFDFN Exposed Pad versus 16-PowerTSSOP), requiring PCB redesign.

Q: Is package compatibility a factor in substitution?

A: Yes. TPS40021MPWPEP uses the identical 16-PowerTSSOP package, supporting direct PCB replacement. TPS40303DRCR uses a 10-VFDFN Exposed Pad package, requiring PCB layout modification, trace routing changes, and thermal management redesign. Package selection depends on available board space and thermal requirements.

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 TPS40020PWPR specifications.

Q: Which substitute part is recommended for new designs?

A: TPS40021MPWPEP is the recommended substitute for new designs. This part is active, maintains complete functional and electrical equivalence to the original design, and requires no circuit or PCB modification. TPS40303DRCR should be considered only when design constraints specifically permit the electrical and mechanical modifications it introduces.