PT5403C Equivalent & Substitute Parts

Part Overview

The PT5403C is a non-isolated Point-of-Load (PoL) module DC-DC converter manufactured by Texas Instruments, part of the Excalibur™ PT5400 series. This device provides a single 2V output at 5.5A maximum current from a 3.1V to 5.5V input supply, designed for commercial ITE applications. The PT5403C is classified as obsolete, necessitating identification of active alternative components that maintain functional and electrical compatibility for new designs or production continuity.

Substiute Parts

PT5403C

Texas InstrumentsIn Stock: 1127PT5403C Datasheet

Current PartRFQ

TPS84610RKGR

Texas InstrumentsIn Stock: 6619TPS84610RKGR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PT5403C requires evaluation against the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Input voltage range must encompass or exceed the PT5403C range (3.1V – 5.5V minimum)
• Output voltage capability must support the required 2V output
• Output current rating must meet or exceed 5.5A
• Single output configuration requirement
• Operating temperature range must cover -40°C to 85°C

Mechanical & Compliance Criteria:

• Surface mount packaging
• ROHS3 compliance
• REACH unaffected status
• Non-isolated PoL module topology

The TPS84610RKGR qualifies as a substitute based on the following alignment:

• Input voltage range (2.95V – 6V) encompasses the PT5403C requirement
• Programmable output voltage (0.8V – 3.6V) supports 2V operation
• Output current rating (6A) exceeds the 5.5A requirement
• Single output configuration
• Operating temperature range (-40°C to 85°C) matches specification
• Surface mount packaging (39-BQFN)
• ROHS3 and REACH compliance maintained
• Active product status ensures ongoing availability

Parameter Comparison

Engineering Selection Recommendations

The TPS84610RKGR is the manufacturer-recommended substitute for the obsolete PT5403C. Selection of this alternative is supported by the following factors:

Product Status & Availability: The PT5403C is classified as obsolete, creating supply chain risk for ongoing production. The TPS84610RKGR maintains active product status with documented inventory availability, ensuring long-term component sourcing.

Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for commercial ITE applications without additional qualification.

Electrical Performance: The TPS84610RKGR provides superior electrical characteristics, including higher efficiency (96% versus 88%), increased output current capability (6A versus 5.5A), and expanded input voltage range (2.95V – 6V versus 3.1V – 5.5V). The programmable output voltage (0.8V – 3.6V) accommodates the fixed 2V requirement of the PT5403C while providing design flexibility for future applications.

Mechanical Integration: Both devices employ surface mount technology suitable for automated assembly. The TPS84610RKGR utilizes a 39-BQFN package with smaller physical dimensions (11.0mm × 9.0mm × 2.8mm) compared to the PT5403C 5-SMD module (28.2mm × 22.9mm × 7.9mm), enabling improved board-level density.

Control Features: The TPS84610RKGR includes additional control functionality (Enable pin, Active High logic) beyond the PT5403C UVLO feature, providing enhanced system integration capabilities.

Frequently Asked Questions (FAQ)

Q: Can the TPS84610RKGR directly replace the PT5403C in existing designs?

A: The TPS84610RKGR is electrically compatible with the PT5403C for the specified 2V output application. However, physical package differences (5-SMD Module versus 39-BQFN) require PCB layout modification. Output voltage programming and control pin configuration must be evaluated against the original design schematic to ensure functional equivalence.

Q: What is the significance of the programmable output voltage range on the TPS84610RKGR?

A: The TPS84610RKGR provides a programmable output voltage range of 0.8V to 3.6V, whereas the PT5403C delivers a fixed 2V output. This flexibility allows the TPS84610RKGR to serve multiple voltage requirements within a single design platform. For PT5403C replacement applications, the output voltage must be configured to 2V through external resistor networks or control logic.

Q: Are there package compatibility considerations when substituting the PT5403C?

A: Yes. The PT5403C uses a 5-SMD Module package (28.2mm × 22.9mm × 7.9mm), while the TPS84610RKGR employs a 39-BQFN Exposed Pad package (11.0mm × 9.0mm × 2.8mm). The TPS84610RKGR's smaller footprint and different pin configuration necessitate PCB redesign. Thermal management characteristics differ due to package geometry; the exposed pad on the TPS84610RKGR provides enhanced thermal dissipation compared to the PT5403C module design.

Q: What is the Moisture Sensitivity Level difference between these devices?

A: The PT5403C carries MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The TPS84610RKGR carries MSL 3 (168 Hours), requiring controlled storage and handling conditions. MSL 3 components must be stored in dry conditions and baked according to IPC-A-610 standards prior to reflow soldering if exposed to ambient humidity for extended periods.

Q: Does the TPS84610RKGR support the same operating temperature range?

A: Yes. Both the PT5403C and TPS84610RKGR operate across the -40°C to 85°C temperature range, maintaining functional performance across commercial ITE application requirements.

Q: What additional features does the TPS84610RKGR provide beyond PT5403C functionality?

A: The TPS84610RKGR includes an Enable pin with Active High logic control, allowing dynamic power management and system-level sequencing. This feature is not present on the PT5403C. The TPS84610RKGR also delivers higher efficiency (96% versus 88%), reducing thermal dissipation and improving overall system power budget performance.