LP4951CMX Equivalent & Substitute Parts

Part Overview

The LP4951CMX is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 100mA output current with adjustable voltage regulation from 1.235V to 30V, making it suitable for low-power supply circuits requiring precision voltage control. The device is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design support and procurement planning.

Substiute Parts

LP4951CMX

Texas InstrumentsIn Stock: 25310LP4951CMX Datasheet

Current PartRFQ

LP4951CMX/NOPB

Texas InstrumentsIn Stock: 2064LP4951CMX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP4951CMX is determined by strict equivalence across the following critical parameters:

• Output configuration and type (Positive Adjustable)
• Output current rating (100mA)
• Input and output voltage specifications (30V max input, 1.235V to 30V output range)
• Dropout voltage performance (0.6V @ 100mA)
• Package type (8-SOIC)
• Quiescent current and supply current characteristics
• Protection and control features (Over Current, Over Temperature, Enable function)
• Operating temperature range (-40°C to 125°C)

The LP4951CMX/NOPB is identified as a parametric equivalent based on identical electrical specifications and mechanical compatibility. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The LP4951CMX/NOPB serves as the direct substitute for the obsolete LP4951CMX. Both components share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility. The LP4951CMX/NOPB maintains active product status with Texas Instruments, providing assured long-term availability and supply chain continuity.

The LP4951CMX/NOPB achieves ROHS3 compliance, whereas the original LP4951CMX is RoHS non-compliant. For applications subject to RoHS regulatory requirements, the LP4951CMX/NOPB is the appropriate selection. The packaging format differs (Tape & Reel versus bulk), which may affect procurement logistics but does not impact electrical performance or board-level integration.

Frequently Asked Questions (FAQ)

Q: Are LP4951CMX and LP4951CMX/NOPB electrically identical?

A: Yes. Both components deliver identical electrical performance across all specified parameters, including output current, voltage regulation range, dropout voltage, quiescent current, and protection features.

Q: What is the difference between LP4951CMX and LP4951CMX/NOPB?

A: The primary differences are product status (Obsolete versus Active), packaging format (Bulk versus Tape & Reel), and RoHS compliance status (non-compliant versus ROHS3 compliant). Electrical and mechanical specifications are identical.

Q: Can LP4951CMX/NOPB be used as a direct replacement in existing designs?

A: Yes. The LP4951CMX/NOPB is a direct substitute with identical pin configuration, package dimensions (8-SOIC), and electrical characteristics. No circuit modifications are required.

Q: Does the Tape & Reel packaging of LP4951CMX/NOPB affect circuit performance?

A: No. Packaging format affects only procurement and handling logistics. The component itself, once removed from the reel and soldered to the PCB, performs identically to bulk-packaged versions.

Q: Is RoHS3 compliance relevant for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and certain other regulated markets. If your application or end market requires RoHS compliance, the LP4951CMX/NOPB is the required selection.

Q: What is the base product number for these components?

A: The base product number is LP4951, which identifies the core device family. Suffixes such as CMX and CMX/NOPB denote specific packaging and compliance variants.