LP2951CN Equivalent & Substitute Parts

Part Overview

The LP2951CN is a linear voltage regulator IC designed for positive adjustable (fixed) output applications with a maximum output current of 100mA. This 8-PDIP through-hole component operates across an input voltage range of up to 30V and provides integrated over-current and over-temperature protection. The LP2951CN is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

LP2951CN

onsemiIn Stock: 11717LP2951CN Datasheet

Current PartRFQ

LP2951ACN/NOPB

Texas InstrumentsIn Stock: 949LP2951ACN/NOPB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LP2951CN is determined by strict equivalence across the following critical parameters:

• Output configuration (Positive)
• Output type (Adjustable/Fixed)
• Number of regulators (1)
• Maximum input voltage (30V)
• Output voltage range (1.235V to 30V)
• Output current capability (100mA)
• Package type (8-DIP through-hole)
• Operating temperature range (-40°C to 125°C)
• Protection features (Over Current, Over Temperature minimum)

The LP2951ACN/NOPB meets all these criteria and qualifies as a direct functional equivalent. Variations in dropout voltage, quiescent current, and supply current do not preclude substitution when the application requirements fall within the specified operating parameters of both devices.

Parameter Comparison

Engineering Selection Recommendations

The LP2951ACN/NOPB is an active product from Texas Instruments and serves as the functional equivalent for the obsolete LP2951CN. Selection of the LP2951ACN/NOPB provides the following advantages:

• Active product status ensures continued availability and manufacturing support
• ROHS3 compliance meets current environmental and regulatory requirements
• Enhanced protection features including short-circuit protection
• Identical package footprint (8-DIP) and pinout compatibility
• Equivalent electrical performance within specified operating ranges

The LP2951ACN/NOPB is suitable for direct substitution in applications where the LP2951CN was previously specified, provided that the application requirements remain within the electrical and thermal parameters of both devices.

Frequently Asked Questions (FAQ)

Q: Can the LP2951ACN/NOPB replace the LP2951CN in existing designs?

A: Yes. Both devices share identical package geometry (8-DIP), pinout configuration, and core electrical specifications including output voltage range, output current, and operating temperature. The LP2951ACN/NOPB is pin-compatible and functionally equivalent.

Q: What are the key differences between these parts?

A: The LP2951ACN/NOPB has a maximum output voltage of 29V compared to 30V for the LP2951CN, and a slightly higher dropout voltage (0.6V vs. 0.45V at 100mA). The LP2951ACN/NOPB includes additional short-circuit protection and is ROHS3 compliant. These differences do not affect substitution in standard applications.

Q: Are there any compatibility concerns with the 8-DIP package?

A: No. Both parts use the identical 8-DIP (0.300", 7.62mm) through-hole package. PCB layouts, socket compatibility, and mechanical mounting are fully interchangeable.

Q: Why is the LP2951CN listed as obsolete?

A: The LP2951CN has been discontinued by onsemi. The LP2951ACN/NOPB from Texas Instruments remains in active production and is the recommended substitute for new designs and production continuity.

Q: Does the LP2951ACN/NOPB require different circuit design considerations?

A: No. The electrical operating parameters, including input/output voltage ranges, output current capability, and protection features, are equivalent. Existing circuit designs require no modification.