LP2951ACM-3.3 Equivalent & Substitute Parts

Part Overview

The LP2951ACM-3.3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) component. This positive adjustable (fixed) output regulator delivers 100mA with a 1.235V to 29V output range and 0.6V maximum dropout at full load. The device is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for design continuity and procurement planning. The 8-SOIC surface mount package and comprehensive protection features (over-current, over-temperature, short-circuit) establish this as a standard solution in low-power voltage regulation applications.

Substiute Parts

LP2951ACM-3.3

Texas InstrumentsIn Stock: 14362LP2951ACM-3.3 Datasheet

Current PartRFQ

LP2951ACM-3.3/NOPB

Texas InstrumentsIn Stock: 3307LP2951ACM-3.3/NOPB Datasheet

DirectRFQ

LP2951CM-3.3/NOPB

Texas InstrumentsIn Stock: 26178LP2951CM-3.3/NOPB Datasheet

Parametric EquivalentRFQ

LP2951ACD-3.3R2G

onsemiIn Stock: 2633LP2951ACD-3.3R2G Datasheet

MFR RecommendedRFQ

LP2951CD-3.3R2G

onsemiIn Stock: 20321LP2951CD-3.3R2G Datasheet

MFR RecommendedRFQ

LP2951CS-L-3-3/TR

MaxLinear, Inc.In Stock: 7183LP2951CS-L-3-3/TR Datasheet

MFR RecommendedRFQ

NCV2951ACD3.3R2G

onsemiIn Stock: 2600NCV2951ACD3.3R2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LP2951ACM-3.3 is determined by strict alignment across the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Output Configuration: Positive
• Voltage - Input (Max): 30V
• Current - Output: 100mA
• Operating Temperature Range: -40°C ~ 125°C
• Protection Features: Over Current, Over Temperature (minimum)

Acceptable Variation Parameters:

• Output Type: Adjustable (Fixed) or Fixed (fixed-output variants acceptable)
• Voltage Dropout (Max): Up to 0.6V @ 100mA
• Current - Quiescent (Iq): Up to 170 µA
• Current - Supply (Max): Up to 14 mA
• Manufacturer: Different manufacturers acceptable if all electrical parameters align

Compliance Requirements:

• RoHS3 Compliant or RoHS Compliant
• MSL 1 (Unlimited)

Substitute parts are grouped into three categories: Direct Manufacturer Equivalents (identical part number variants from Texas Instruments), Parametric Equivalents (Texas Instruments parts with compatible electrical specifications), and Manufacturer-Recommended Alternatives (qualified parts from onsemi and MaxLinear, Inc. meeting all electrical and mechanical requirements).

Parameter Comparison

Engineering Selection Recommendations

Direct Manufacturer Equivalents (Highest Priority): LP2951ACM-3.3/NOPB and LP2951CM-3.3/NOPB are both Active status parts from Texas Instruments with identical electrical specifications to the main part. LP2951ACM-3.3/NOPB is the direct equivalent with NOPB (No Plumbum/Lead-Free) designation. LP2951CM-3.3/NOPB offers the highest inventory availability (26,145 pcs) among all substitutes and maintains full parametric compatibility. These parts are recommended for immediate design migration from the Last Time Buy LP2951ACM-3.3.

Manufacturer-Recommended Alternatives (Secondary Priority): LP2951ACD-3.3R2G, LP2951CD-3.3R2G, and NCV2951ACD3.3R2G from onsemi, and LP2951CS-L-3-3/TR from MaxLinear, Inc. are all Active status parts meeting all mandatory electrical and mechanical requirements. These alternatives feature improved dropout voltage (0.45V vs. 0.6V), reducing power dissipation in battery-powered or low-input-voltage applications. onsemi parts are available in both Cut Tape and Tape & Reel packaging options. NCV2951ACD3.3R2G carries automotive-grade qualification (AEC-Q100), suitable for automotive and harsh-environment applications. LP2951CS-L-3-3/TR from MaxLinear, Inc. includes Enable control features and is available in Tape & Reel packaging with 7,163 pcs inventory.

Compliance Considerations: All substitute parts maintain ROHS3 Compliance (or RoHS Compliance for MaxLinear part) and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes. REACH and ECCN classifications remain consistent across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can I use LP2951ACD-3.3R2G as a direct replacement for LP2951ACM-3.3? A: Yes. Both parts share identical input voltage (30V max), output current (100mA), operating temperature range (-40°C to 125°C), and 8-SOIC package. The LP2951ACD-3.3R2G is a fixed-output variant (3.3V) versus the adjustable/fixed output of the main part, but both deliver 3.3V in this configuration. The improved dropout voltage (0.45V vs. 0.6V) is a performance advantage. Verify your application does not require the adjustable output feature of the original part.

Q: What is the difference between LP2951ACM-3.3/NOPB and LP2951CM-3.3/NOPB? A: Both are Texas Instruments parts with identical electrical specifications and Active product status. The primary difference is inventory availability: LP2951CM-3.3/NOPB has 26,145 pcs in stock versus 3,198 pcs for LP2951ACM-3.3/NOPB. Both are suitable for direct substitution. Select based on procurement lead time and inventory requirements.

Q: Why do some substitute parts have lower quiescent current (Iq)? A: Quiescent current represents the regulator's internal power consumption when no load is applied. Lower Iq values (120 µA vs. 170 µA in LP2951CS-L-3-3/TR) reduce standby power consumption, beneficial in battery-powered applications. This is a performance improvement, not a limitation.

Q: Is the NCV2951ACD3.3R2G suitable for non-automotive applications? A: Yes. NCV2951ACD3.3R2G is automotive-grade (AEC-Q100 qualified) but fully compatible with industrial and commercial applications. Automotive qualification indicates enhanced reliability testing and stricter manufacturing controls, making it suitable for any application requiring high reliability. Use this part when maximum quality assurance is required.

Q: What packaging options are available for substitutes? A: Substitute parts are available in three packaging formats: Tube (LP2951ACM-3.3/NOPB, LP2951CM-3.3/NOPB), Cut Tape & Digi-Reel (LP2951ACD-3.3R2G), and Tape & Reel (LP2951CD-3.3R2G, LP2951CS-L-3-3/TR, NCV2951ACD3.3R2G). Select packaging based on your assembly process requirements and volume.

Q: Can I use these substitutes in designs requiring short-circuit protection? A: The main part LP2951ACM-3.3 includes short-circuit protection. Most substitute parts (LP2951ACM-3.3/NOPB, LP2951CM-3.3/NOPB) maintain this feature. onsemi and MaxLinear alternatives provide over-current and over-temperature protection but do not explicitly list short-circuit protection. If short-circuit protection is critical, prioritize Texas Instruments direct equivalents or verify application requirements with the regulator's datasheet.

Q: Are all substitutes RoHS compliant? A: Yes. All substitute parts are either ROHS3 Compliant or RoHS Compliant, meeting environmental and regulatory requirements for lead-free manufacturing and hazardous substance restrictions.