LP2951CSDX-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951CSDX-3.3 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 original LP2951CSDX-3.3 carries an Obsolete product status. Identifying equivalent and substitute parts ensures design continuity and supply chain reliability for applications requiring this regulator topology and electrical performance.

Substiute Parts

LP2951CSDX-3.3

Texas InstrumentsIn Stock: 794LP2951CSDX-3.3 Datasheet

Current PartRFQ

LP2951CSDX-3.3/NOPB

Texas InstrumentsIn Stock: 4916LP2951CSDX-3.3/NOPB Datasheet

DirectRFQ

LP2951ACSDX-3.3/NOPB

Texas InstrumentsIn Stock: 1032LP2951ACSDX-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951CSD-3.3/NOPB

Texas InstrumentsIn Stock: 18364LP2951CSD-3.3/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LP2951CSDX-3.3 are determined by electrical and mechanical parameter equivalence within the LP2951 family. The following criteria establish substitutability:

Critical Matching Parameters:

• Output Configuration: Positive
• Output Type: Adjustable (Fixed)
• Number of Regulators: 1
• Voltage ratings: Input (Max) 30V, Output (Min/Fixed) 1.235V (3.3V), Output (Max) 29V
• Voltage Dropout: 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)
• Package / Case: 8-WDFN Exposed Pad
• Supplier Device Package: 8-WSON (4x4)

All substitute parts maintain identical electrical specifications and package configuration, differing only in product status, RoHS compliance, and packaging format (Tape & Reel vs. standard packaging).

Parameter Comparison

Engineering Selection Recommendations

LP2951CSDX-3.3/NOPB is the direct manufacturer equivalent with Active product status and ROHS3 compliance. This part is suitable for new designs and ongoing production requiring RoHS-compliant components with standard Tape & Reel packaging.

LP2951ACSDX-3.3/NOPB is a parametric equivalent offering Active product status and ROHS3 compliance. This variant maintains identical electrical specifications and package configuration, providing an alternative sourcing option with 1011 units in stock.

LP2951CSD-3.3/NOPB is a parametric equivalent with Active product status and ROHS3 compliance. This part variant offers the highest inventory availability at 18,300 units, making it suitable for high-volume production requirements while maintaining full electrical and mechanical compatibility.

All three substitute parts eliminate the Obsolete status of the original LP2951CSDX-3.3 and provide ROHS3 compliance for regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can LP2951CSDX-3.3/NOPB replace LP2951CSDX-3.3 in existing designs?

A: Yes. Both parts share identical electrical specifications, output configuration, voltage ratings, current ratings, protection features, operating temperature range, and 8-WSON (4x4) package configuration. The primary difference is product status (Active vs. Obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between LP2951CSDX-3.3/NOPB, LP2951ACSDX-3.3/NOPB, and LP2951CSD-3.3/NOPB?

A: All three parts are parametric equivalents with identical electrical performance and package specifications. Differences exist only in product status (all Active), RoHS compliance (all ROHS3), and inventory availability. The suffix variations (CSDX vs. ACSDX vs. CSD) indicate internal manufacturing or qualification differences that do not affect electrical or mechanical compatibility.

Q: Are these parts pin-compatible?

A: Yes. All substitute parts use the 8-WSON (4x4) package with 8-WDFN Exposed Pad configuration, ensuring identical PCB footprint and pin assignment compatibility.

Q: Which substitute part should be selected for new production?

A: LP2951CSD-3.3/NOPB is recommended for new production due to highest inventory availability (18,300 units) and Active product status with ROHS3 compliance. LP2951CSDX-3.3/NOPB and LP2951ACSDX-3.3/NOPB are suitable alternatives with lower inventory levels.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts carry ROHS3 Compliant status, meeting RoHS Directive 2011/65/EU requirements. The original LP2951CSDX-3.3 is RoHS non-compliant.

Q: What is the significance of the /NOPB suffix?

A: The /NOPB suffix indicates "No Plumbum" (lead-free) packaging, confirming RoHS compliance and the absence of lead in the component manufacturing process.