TPS54873PWPR Equivalent & Substitute Parts

Part Overview

The TPS54873PWPR is a buck switching regulator IC from Texas Instruments' SWIFT™ series, designed for positive adjustable step-down voltage regulation. It delivers 8A output current with an input voltage range of 4V to 6V and adjustable output from 0.9V to 3.3V. The device operates at switching frequencies of 350kHz or 550kHz and includes a synchronous rectifier for improved efficiency. Currently in Last Time Buy status with 3048 units in stock, this part requires identification of suitable alternatives for ongoing design requirements.

Substiute Parts

TPS54873PWPR

Texas InstrumentsIn Stock: 3148TPS54873PWPR Datasheet

Current PartRFQ

TPS62871QWRXSRQ1

Texas InstrumentsIn Stock: 2703TPS62871QWRXSRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPS54873PWPR is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Buck topology with positive adjustable output configuration
• Input voltage range capability (minimum 4V, maximum 6V support required)
• Output voltage adjustability range (minimum 0.9V, maximum 3.3V support required)
• Output current rating (minimum 8A required)
• Synchronous rectifier implementation
• Operating temperature range (-40°C to 85°C minimum)

Mechanical Compatibility Criteria:

• Surface mount technology
• Package footprint compatibility or acceptable redesign tolerance

Compliance Criteria:

• ROHS3 compliance
• Moisture sensitivity level 2 or better

The TPS62871QWRXSRQ1 qualifies as a manufacturer-recommended substitute based on meeting or exceeding all critical electrical parameters while maintaining compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

The TPS62871QWRXSRQ1 is the manufacturer-recommended substitute for the TPS54873PWPR. All critical electrical parameters are met or exceeded: input voltage range, output voltage adjustability, output current capacity, and operating temperature range. Both devices maintain ROHS3 compliance and identical moisture sensitivity specifications.

The primary design consideration is package transition from 28-PowerTSSOP to 16-TFQFN Exposed Pad, which requires PCB layout modification. The substitute device offers additional benefits including active product status, automotive-grade qualification (AEC-Q100), and higher switching frequency options (1.5MHz to 3MHz versus 350kHz to 550kHz), enabling potential reduction in external component size.

Current inventory availability: TPS54873PWPR (3048 units), TPS62871QWRXSRQ1 (2659 units).

Frequently Asked Questions (FAQ)

Q: Can the TPS62871QWRXSRQ1 directly replace the TPS54873PWPR without PCB changes?

A: No. The TPS54873PWPR uses a 28-PowerTSSOP package while the TPS62871QWRXSRQ1 uses a 16-TFQFN Exposed Pad package. PCB layout redesign is required, including trace routing and thermal management modifications for the exposed pad configuration.

Q: Are the output voltage ranges compatible?

A: Yes. The TPS54873PWPR provides 0.9V to 3.3V adjustable output. The TPS62871QWRXSRQ1 provides 0.4V to 3.35V, which encompasses the original range and extends lower and upper limits.

Q: What is the impact of the higher switching frequency in the substitute?

A: The TPS62871QWRXSRQ1 operates at 1.5MHz to 3MHz compared to 350kHz to 550kHz in the original. Higher switching frequency allows use of smaller inductors and capacitors, reducing board space and component cost, but requires attention to PCB layout for EMI management.

Q: Does the automotive qualification of the substitute affect non-automotive applications?

A: No. Automotive-grade components (AEC-Q100) meet or exceed standard industrial specifications. The TPS62871QWRXSRQ1 is suitable for both automotive and non-automotive applications.

Q: What is the input voltage compatibility?

A: The TPS54873PWPR requires 4V to 6V input. The TPS62871QWRXSRQ1 accepts 2.7V to 6V input, providing broader input range capability while maintaining compatibility with the original 4V to 6V operating window.

Q: Is thermal management different between the two packages?

A: Yes. The 28-PowerTSSOP has a larger footprint with integrated thermal pad. The 16-TFQFN Exposed Pad is smaller but includes an exposed pad for direct thermal connection to PCB ground plane. Thermal design must be re-evaluated during layout transition.

Q: Are there any compliance or certification differences?

A: Both devices are ROHS3 compliant with identical moisture sensitivity levels. The substitute includes AEC-Q100 automotive qualification, which is an additional certification not present in the original part.