LM2731YMF Equivalent & Substitute Parts

Part Overview

The LM2731YMF is a boost switching regulator IC from Texas Instruments designed for step-up voltage conversion applications. It delivers positive adjustable output with 1.8A switch current capability in a compact SC-74A, SOT-753 surface mount package. The device operates across a 2.7V to 14V input range with adjustable output from 1.23V to 22V at 600kHz switching frequency.

This part carries Last Time Buy status, indicating end-of-life production. Identifying qualified substitute components ensures design continuity and supply chain reliability for new production runs or design revisions.

Substiute Parts

LM2731YMF

Texas InstrumentsIn Stock: 2266LM2731YMF Datasheet

Current PartRFQ

TPS61376RYHR

Texas InstrumentsIn Stock: 1124TPS61376RYHR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for boost regulator ICs is determined by functional compatibility across core electrical and mechanical parameters:

Primary Substitution Criteria:

• Topology: Boost (step-up) switching regulator
• Output Configuration: Positive adjustable
• Input voltage range overlap with original specification
• Output voltage range capability
• Surface mount package compatibility
• Operating temperature range coverage
• Regulatory compliance (RoHS3, REACH)

The TPS61376RYHR qualifies as a manufacturer-recommended substitute based on matching boost topology, positive adjustable output configuration, overlapping input/output voltage ranges, and equivalent regulatory compliance. Package form factor differs (13-PowerVFQFN vs. SOT-23-5), requiring PCB layout redesign.

Parameter Comparison

Engineering Selection Recommendations

The TPS61376RYHR is the manufacturer-recommended substitute for LM2731YMF applications. Both devices maintain ROHS3 compliance and equivalent operating temperature specifications (-40°C to 125°C).

Key considerations for substitution:

Electrical Compatibility: The TPS61376RYHR accepts higher input voltage (up to 23V vs. 14V maximum) and delivers higher output voltage capability (up to 25V vs. 22V). Minimum output voltage is higher at 4.5V compared to 1.23V. Switching frequency increases to 1.2MHz, reducing external component size requirements. These parameters remain within acceptable boost regulator substitution boundaries for most applications.

Package Transition: The shift from SOT-23-5 to 13-PowerVFQFN requires PCB layout redesign. The 13-PowerVFQFN package (2.5x2mm) offers improved thermal performance and higher pin density compared to the five-pin SOT-23-5 footprint.

Supply Chain Status: TPS61376RYHR maintains Active product status with 1037 units in stock, ensuring long-term availability. LM2731YMF Last Time Buy status necessitates migration planning.

Regulatory Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, supporting equivalent regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can TPS61376RYHR directly replace LM2731YMF without circuit modifications?

A: Electrical substitution is feasible due to matching boost topology and adjustable output configuration. However, package form factor differs significantly (SOT-23-5 to 13-PowerVFQFN), requiring PCB layout redesign. Pin assignments and external component values may require adjustment based on datasheet specifications.

Q: What are the key electrical differences between these parts?

A: Input voltage range expands from 2.7-14V to 2.9-23V. Output voltage minimum increases from 1.23V to 4.5V, while maximum output increases from 22V to 25V. Switching frequency doubles from 600kHz to 1.2MHz. Output current specification is not provided for TPS61376RYHR in the available data.

Q: Why is the TPS61376RYHR recommended as a substitute?

A: Texas Instruments officially designates TPS61376RYHR as the recommended substitute. Both devices share identical boost topology, positive adjustable output configuration, equivalent operating temperature range, and ROHS3 compliance. The substitute maintains functional compatibility while offering extended input voltage capability and higher switching frequency.

Q: Does package change affect thermal performance?

A: The 13-PowerVFQFN package provides improved thermal characteristics compared to SOT-23-5 due to larger die attachment area and enhanced heat dissipation paths. Thermal design review is recommended during layout transition.

Q: Are there moisture sensitivity differences?

A: LM2731YMF carries MSL 1 (Unlimited), while TPS61376RYHR carries MSL 2 (1 Year). This represents a minor increase in moisture sensitivity requiring standard handling precautions during storage and assembly.