LM2731XMF Equivalent & Substitute Parts

Part Overview

The LM2731XMF is a boost switching regulator IC from Texas Instruments designed for step-up voltage conversion applications. It delivers positive adjustable output voltage 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 output voltage adjustable from 2.7V to 22V, making it suitable for battery-powered and low-voltage supply applications requiring voltage elevation.

This part is currently in Last Time Buy status, indicating end-of-life production. Identifying qualified substitute components ensures design continuity and supply chain reliability for new production runs and long-term product support.

Substiute Parts

LM2731XMF

Texas InstrumentsIn Stock: 1502LM2731XMF Datasheet

Current PartRFQ

TLV61048DBVR

Texas InstrumentsIn Stock: 35496TLV61048DBVR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for boost regulator ICs is determined by functional compatibility across the following critical parameters:

Primary Substitution Criteria:

• Topology: Boost (step-up) switching regulator
• Output Configuration: Positive adjustable voltage
• Input voltage range overlap with LM2731XMF (2.7V minimum)
• Output voltage range capability (minimum 2.7V to maximum ≥22V)
• Current delivery capacity (≥1.8A switch current)
• Operating temperature range: -40°C ~ 125°C
• Surface mount packaging with compatible pinout
• RoHS3 compliance and MSL rating

The TLV61048DBVR qualifies as a manufacturer-recommended substitute based on functional equivalence within the boost regulator category, though specific parameter differences require engineering evaluation for application-specific requirements.

Parameter Comparison

Engineering Selection Recommendations

The TLV61048DBVR is designated as the manufacturer-recommended substitute for the LM2731XMF. Both devices are produced by Texas Instruments and maintain ROHS3 compliance with MSL 1 ratings, ensuring regulatory and environmental compatibility.

Key considerations for substitution:

Voltage Range Limitations: The TLV61048DBVR operates with a maximum input voltage of 5.5V compared to the LM2731XMF's 14V maximum. Applications requiring input voltages above 5.5V cannot use this substitute without external voltage limiting circuitry.

Output Voltage Ceiling: The TLV61048DBVR maximum output voltage is 14V versus the LM2731XMF's 22V. Designs requiring output voltages above 14V require alternative substitutes or the original part.

Package Transition: The substitute uses SOT-23-6 packaging versus the original SC-74A (SOT-753) five-pin package. PCB layout and schematic modifications are necessary for implementation.

Active Product Status: The TLV61048DBVR maintains active production status, providing long-term supply availability and support compared to the LM2731XMF's Last Time Buy status.

Frequently Asked Questions (FAQ)

Q: Can the TLV61048DBVR directly replace the LM2731XMF without circuit modifications?

A: No. The TLV61048DBVR uses a different package (SOT-23-6 versus SOT-753) and has different electrical specifications. PCB layout changes and potential schematic adjustments are required. Verify that your application's input voltage does not exceed 5.5V and output voltage requirements do not exceed 14V.

Q: What is the primary reason for substitution?

A: The LM2731XMF is in Last Time Buy status, indicating discontinued production. The TLV61048DBVR provides functional boost regulator capability with active manufacturing status for ongoing supply chain support.

Q: Are there applications where the TLV61048DBVR cannot substitute for the LM2731XMF?

A: Yes. Applications requiring input voltages above 5.5V or output voltages above 14V cannot use the TLV61048DBVR. The original LM2731XMF supports input up to 14V and output up to 22V. Alternative substitutes or the original part must be evaluated for such applications.

Q: How do the switching frequencies compare?

A: The LM2731XMF operates at 1.6MHz fixed frequency. The TLV61048DBVR offers selectable switching frequencies of 550kHz or 1MHz. This affects EMI characteristics, component sizing, and efficiency profiles. Application-specific frequency requirements must be evaluated.

Q: Are both devices RoHS compliant?

A: Yes. Both the LM2731XMF and TLV61048DBVR are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting current environmental and regulatory standards.

Q: What is the impact of the package change?

A: The TLV61048DBVR's SOT-23-6 package has six pins compared to the LM2731XMF's five-pin SC-74A package. This requires new PCB footprint design, trace routing, and potential schematic modifications. Pin function mapping must be verified against device datasheets.