LP2951CMX Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The LP2951CMX is a linear voltage regulator IC from onsemi designed for positive adjustable (fixed) output applications with 100mA current capability in an 8-SOIC surface mount package. This device is classified as obsolete, making identification of active equivalent parts essential for ongoing production and design continuity. The LP2951CMX provides regulated output voltage from 1.26V to 29.4V with integrated over-temperature and short-circuit protection, suitable for low-power supply applications requiring compact form factors.

Substiute Parts

LP2951CMX

onsemiIn Stock: 9386LP2951CMX Datasheet

Current PartRFQ

LP2951CDR2G

onsemiIn Stock: 23969LP2951CDR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The LP2951CDR2G qualifies as a direct substitute for the LP2951CMX based on the following critical parameters:

• Identical manufacturer (onsemi) and base product number (LP2951)
• Matching package specification: 8-SOIC (0.154", 3.90mm Width)
• Identical output configuration (Positive) and output type (Adjustable/Fixed)
• Identical number of regulators (1)
• Matching maximum input voltage (30V)
• Matching output current rating (100mA)
• Identical operating temperature range (-40°C ~ 125°C)
• Identical mounting type (Surface Mount)
• Matching RoHS3 compliance and MSL 1 rating

The LP2951CDR2G is the active production equivalent, with enhanced specifications in dropout voltage and quiescent current performance.

Parameter Comparison

Engineering Selection Recommendations

The LP2951CDR2G is the recommended active production substitute for the obsolete LP2951CMX. Both devices maintain identical electrical and mechanical specifications across all critical parameters, ensuring direct PCB compatibility without layout modifications. The LP2951CDR2G offers improved performance characteristics with lower dropout voltage (0.45V vs 0.6V) and reduced quiescent current (120 µA vs 140 µA), providing enhanced efficiency in power-constrained applications. Both parts maintain ROHS3 compliance and MSL 1 rating, satisfying environmental and moisture sensitivity requirements for standard manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can LP2951CDR2G be used as a direct replacement for LP2951CMX without PCB modifications?

A: Yes. Both devices share identical package specifications (8-SOIC, 0.154" width), pinout configuration, and electrical operating parameters. No PCB layout changes are required for substitution.

Q: What are the key differences between LP2951CMX and LP2951CDR2G?

A: The primary differences are product status (obsolete vs. active) and performance enhancements in the substitute. The LP2951CDR2G features improved dropout voltage (0.45V vs. 0.6V at 100mA) and lower quiescent current (120 µA vs. 140 µA), resulting in better power efficiency.

Q: Are both parts RoHS compliant?

A: Yes. Both LP2951CMX and LP2951CDR2G are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the maximum input voltage for both devices?

A: Both devices support a maximum input voltage of 30V, with adjustable output voltage ranging from 1.26V (LP2951CMX) or 1.235V (LP2951CDR2G) to 29.4V or 30V respectively.

Q: Are there any control feature differences?

A: The LP2951CMX includes Enable control features, while the LP2951CDR2G does not list Enable functionality. Protection features differ slightly: LP2951CMX provides Over Temperature and Short Circuit protection, while LP2951CDR2G provides Over Current and Over Temperature protection.