LP2951ACSD Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2951ACSD is a linear voltage regulator IC from Texas Instruments designed for positive adjustable (fixed) output applications. This Surface Mount device delivers 100mA output current in an 8-WSON (4x4) package with integrated protection features including over-current, over-temperature, and short-circuit protection.

The LP2951ACSD carries a "Not For New Designs" product status, indicating it is obsolete or in end-of-life phase. Identifying parametrically equivalent substitute parts is essential for ongoing production support, maintenance applications, and design continuity where this component is currently deployed.

Substiute Parts

LP2951ACSD

Texas InstrumentsIn Stock: 3964LP2951ACSD Datasheet

Current PartRFQ

LP2951ACSD/NOPB

Texas InstrumentsIn Stock: 30460LP2951ACSD/NOPB Datasheet

Parametric EquivalentRFQ

LP2951ACSDX/NOPB

Texas InstrumentsIn Stock: 9219LP2951ACSDX/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CSD/NOPB

Texas InstrumentsIn Stock: 2265LP2951CSD/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CSDX/NOPB

Texas InstrumentsIn Stock: 4910LP2951CSDX/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2951ACSD are determined by strict parametric equivalence across the following critical criteria:

Electrical Parameters (Must Match):

• Output Configuration: Positive
• Output Type: Adjustable (Fixed)
• Voltage - Input (Max): 30V
• Voltage - Output (Min/Fixed): 1.235V (5V)
• Voltage - Output (Max): 29V
• Voltage Dropout (Max): 0.6V @ 100mA
• Current - Output: 100mA
• Current - Quiescent (Iq): 120 µA
• Current - Supply (Max): 14 mA
• Control Features: Enable
• Protection Features: Over Current, Over Temperature, Short Circuit
• Operating Temperature: -40°C ~ 125°C (TJ)

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Package / Case: 8-WDFN Exposed Pad
• Supplier Device Package: 8-WSON (4x4)

All substitute parts listed below maintain identical electrical and mechanical specifications to the LP2951ACSD, ensuring direct functional compatibility in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed—LP2951ACSD/NOPB, LP2951ACSDX/NOPB, LP2951CSD/NOPB, and LP2951CSDX/NOPB—are parametrically equivalent to the LP2951ACSD and provide direct functional replacement in existing designs.

Product Status Consideration: The LP2951ACSD carries "Not For New Designs" status, while all substitute parts are marked "Active." This distinction indicates that substitute parts represent the current production-qualified alternatives from Texas Instruments and are recommended for ongoing supply continuity.

Compliance Advantage: All substitute parts achieve ROHS3 compliance, whereas the LP2951ACSD is RoHS non-compliant. This compliance improvement aligns with current regulatory requirements for electronic components in regulated markets.

Packaging and Availability: Substitute parts are available in multiple packaging configurations (Cut Tape & Digi-Reel, standard packaging, and Tape & Reel), providing flexibility for different procurement and assembly workflows. Inventory levels vary across part numbers, allowing selection based on supply requirements.

Frequently Asked Questions (FAQ)

Q: Can LP2951ACSD/NOPB, LP2951ACSDX/NOPB, LP2951CSD/NOPB, and LP2951CSDX/NOPB be used interchangeably with LP2951ACSD?

A: Yes. All substitute parts maintain identical electrical and mechanical specifications, including output voltage range (1.235V to 29V), 100mA output current, 0.6V maximum dropout voltage, and 8-WSON (4x4) package configuration. Direct substitution is supported without circuit modification.

Q: What is the difference between LP2951ACSD and LP2951CSD variants?

A: The primary difference is product status. LP2951ACSD is marked "Not For New Designs," while LP2951CSD is "Active." Both maintain identical electrical and mechanical parameters. The "C" designation in LP2951CSD indicates a different temperature or performance grade variant within the LP2951 family, but electrical specifications remain equivalent for substitution purposes.

Q: Why do some part numbers include "/NOPB" suffix?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS3 compliance. Parts with this designation meet current environmental and regulatory requirements for lead-free soldering and are preferred for new production and long-term supply continuity.

Q: What packaging options are available for substitute parts?

A: Substitute parts are offered in three packaging configurations: Cut Tape (CT) & Digi-Reel for standard component distribution, standard packaging for direct component sourcing, and Tape & Reel (TR) for high-volume automated assembly. Selection depends on procurement volume and assembly process requirements.

Q: Are all substitute parts suitable for the same operating temperature range?

A: Yes. All substitute parts operate across the identical temperature range of -40°C to 125°C (junction temperature), ensuring thermal compatibility in applications requiring extended temperature performance.

Q: What protection features are included in substitute parts?

A: All substitute parts include integrated over-current, over-temperature, and short-circuit protection, matching the LP2951ACSD feature set. These protections ensure circuit reliability under fault conditions.