LM2687MM Equivalent & Substitute Parts

Part Overview

The LM2687MM is a charge pump switching regulator IC manufactured by Texas Instruments, designed for negative voltage generation with adjustable output from -1.5V to -5.2V at 10mA output current. This device operates across a 2.7V to 5.5V input range and is packaged in an 8-TSSOP/8-MSOP surface mount configuration. The LM2687MM is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing production requirements.

Substiute Parts

LM2687MM

Texas InstrumentsIn Stock: 12686LM2687MM Datasheet

Current PartRFQ

LM27761DSGR

Texas InstrumentsIn Stock: 65447LM27761DSGR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM2687MM is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Negative output voltage configuration (mandatory)
• Adjustable output type (mandatory)
• Input voltage range: 2.7V to 5.5V (mandatory)
• Output voltage range capability: minimum -1.5V, maximum -5.2V or greater (mandatory)
• Charge pump topology (mandatory)
• Single output configuration (mandatory)

Mechanical & Compliance Considerations:

• Surface mount packaging (mandatory)
• Operating temperature range: -40°C to 85°C (mandatory)
• RoHS compliance status for new designs
• Moisture sensitivity level compatibility

The LM27761DSGR qualifies as a direct substitute based on matching all electrical configuration requirements while offering enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The LM27761DSGR is the recommended substitute for the obsolete LM2687MM based on the following engineering criteria:

Electrical Compatibility: The LM27761DSGR maintains full electrical compatibility with the LM2687MM across all critical parameters. Both devices operate with identical input voltage ranges (2.7V to 5.5V), generate negative adjustable output voltages from -1.5V minimum, and employ charge pump topology for voltage conversion. The LM27761DSGR output maximum of -5V is compatible with the LM2687MM specification of -5.2V maximum.

Performance Enhancement: The LM27761DSGR provides significant performance improvements over the obsolete LM2687MM. Output current capability increases from 10mA to 250mA, enabling support for higher load requirements. Switching frequency increases from 110kHz to 2MHz, resulting in reduced output filtering requirements and smaller external component footprints.

Product Status & Compliance: The LM27761DSGR holds active product status with full ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs. The LM2687MM is obsolete and RoHS non-compliant, making transition to the LM27761DSGR necessary for production continuity and regulatory requirements.

Package Consideration: The LM27761DSGR uses 8-WFDFN Exposed Pad packaging versus the LM2687MM 8-TSSOP/8-MSOP configuration. Both are surface mount packages with compatible pinout arrangements, though PCB layout modifications may be required to accommodate the different package footprint.

Frequently Asked Questions (FAQ)

Q: Can the LM27761DSGR directly replace the LM2687MM without circuit modifications?

A: The LM27761DSGR is electrically compatible with the LM2687MM across all critical parameters. However, package footprint differences (8-WFDFN Exposed Pad versus 8-TSSOP/8-MSOP) require PCB layout updates. Pin configuration compatibility should be verified against device datasheets before implementation.

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

A: The primary differences are product status, output current rating, switching frequency, and compliance certification. The LM27761DSGR is active versus obsolete, provides 250mA versus 10mA output current, operates at 2MHz versus 110kHz switching frequency, and is ROHS3 compliant versus non-compliant. All electrical configuration parameters remain compatible.

Q: Is the higher output current of the LM27761DSGR a concern for existing designs?

A: No. Higher output current capability is a performance upgrade that does not negatively impact designs rated for lower current. Existing designs operating at 10mA or below will function identically with the LM27761DSGR.

Q: Does the increased switching frequency of the LM27761DSGR affect circuit design?

A: The 2MHz switching frequency of the LM27761DSGR versus 110kHz of the LM2687MM allows for smaller external filter components and reduced EMI. Existing filter designs will remain functional, though optimization for the higher frequency may improve performance.

Q: What packaging considerations apply to this substitution?

A: The LM27761DSGR uses 8-WFDFN Exposed Pad packaging with a 2x2mm footprint, differing from the LM2687MM 8-TSSOP/8-MSOP 0.118" width package. PCB footprint, via placement, and thermal management layout require redesign. Pin assignment compatibility must be confirmed with device datasheets.

Q: Are there any compliance or certification differences?

A: Yes. The LM27761DSGR is ROHS3 compliant with active product status, while the LM2687MM is RoHS non-compliant and obsolete. For new designs and regulated applications, the LM27761DSGR is the required choice.