LP2950-03BZ Equivalent & Substitute Parts

Part Overview

The LP2950-03BZ is a linear voltage regulator IC manufactured by Microchip Technology, designed to deliver a fixed 5V output at 100mA in a TO-92-3 package. This device operates across an input voltage range up to 30V with a maximum dropout voltage of 0.6V at 100mA and quiescent current of 150µA. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain identical electrical specifications and mechanical compatibility while preferably offering active product status and improved compliance certifications.

Substiute Parts

LP2950-03BZ

Microchip TechnologyIn Stock: 50403LP2950-03BZ Datasheet

Current PartRFQ

L78L05ABZ

STMicroelectronicsIn Stock: 55124L78L05ABZ Datasheet

MFR RecommendedRFQ

LP2950ACZ-5.0/LFT7

Texas InstrumentsIn Stock: 5417LP2950ACZ-5.0/LFT7 Datasheet

MFR RecommendedRFQ

LP2950ACZ-5.0/NOPB

Texas InstrumentsIn Stock: 2012LP2950ACZ-5.0/NOPB Datasheet

MFR RecommendedRFQ

LP2950ACZ-5.0G

onsemiIn Stock: 2860LP2950ACZ-5.0G Datasheet

MFR RecommendedRFQ

LP2950CZ-5.0/NOPB

Texas InstrumentsIn Stock: 3360LP2950CZ-5.0/NOPB Datasheet

MFR RecommendedRFQ

LP2950CZ-5.0G

onsemiIn Stock: 2018LP2950CZ-5.0G Datasheet

MFR RecommendedRFQ

MC78L05ABPG

onsemiIn Stock: 2217MC78L05ABPG Datasheet

MFR RecommendedRFQ

MC78L05ACPG

onsemiIn Stock: 9952MC78L05ACPG Datasheet

MFR RecommendedRFQ

NCV78L05ABPG

onsemiIn Stock: 764NCV78L05ABPG Datasheet

MFR RecommendedRFQ

UA78L05ACLPM

Texas InstrumentsIn Stock: 3809UA78L05ACLPM Datasheet

MFR RecommendedRFQ

UA78L05ACLPME3

Texas InstrumentsIn Stock: 7173UA78L05ACLPME3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

• Output voltage fixed at 5V
• Output current capability of 100mA minimum
• Input voltage rating of 30V or higher
• Package compatibility: TO-92-3 or TO-226-3 equivalent
• Through-hole mounting configuration
• Operating temperature range: -40°C to 125°C minimum

Substitute parts are grouped into two categories based on dropout voltage specification:

Category A (Matched Dropout Voltage): Parts specifying 0.6V @ 100mA dropout voltage, providing direct electrical equivalence to the LP2950-03BZ.

Category B (Unspecified Dropout Voltage): Parts with dropout voltage not specified in available data, suitable for applications where dropout voltage is not a critical design parameter.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Matched Electrical Characteristics):

LP2950ACZ-5.0/LFT7 and LP2950ACZ-5.0/NOPB (Texas Instruments) provide direct electrical equivalence with identical 0.6V dropout voltage specification and active product status. Both are ROHS3 compliant. The /LFT7 variant is supplied in cut tape packaging, while /NOPB is supplied in bulk.

LP2950ACZ-5.0G and LP2950CZ-5.0G (onsemi) offer superior dropout voltage performance at 0.45V @ 100mA, lower quiescent current at 120µA, and active product status with ROHS3 compliance. These parts are suitable for applications requiring enhanced efficiency.

Secondary Substitutes (Functional Equivalence):

L78L05ABZ (STMicroelectronics), MC78L05ABPG, MC78L05ACPG, and NCV78L05ABPG (onsemi) meet all electrical and mechanical requirements with active product status and ROHS3 compliance. Dropout voltage is not specified for these parts. MC78L05ACPG operates from 0°C minimum, not -40°C. NCV78L05ABPG carries automotive qualification (AEC-Q100) for applications requiring automotive-grade components.

Not Recommended:

UA78L05ACLPM (Texas Instruments) has reduced maximum input voltage (20V vs. 30V) and higher dropout voltage (1.7V @ 40mA), limiting its suitability. Product status is Last Time Buy, indicating end-of-life status.

Frequently Asked Questions (FAQ)

Q: Can I use LP2950ACZ-5.0G as a direct replacement for LP2950-03BZ?

A: Yes. Both parts deliver 5V at 100mA with 30V maximum input voltage and -40°C to 125°C operating range in TO-92-3 packages. LP2950ACZ-5.0G offers improved dropout voltage (0.45V vs. 0.6V) and is ROHS3 compliant with active product status.

Q: What is the difference between LP2950ACZ-5.0/LFT7 and LP2950ACZ-5.0/NOPB?

A: Both are Texas Instruments LP2950 variants with identical electrical specifications. The /LFT7 suffix indicates cut tape packaging, while /NOPB indicates bulk packaging. Selection depends on procurement and assembly requirements.

Q: Why do some substitute parts not specify dropout voltage?

A: Dropout voltage specification varies by manufacturer datasheet detail level. Parts without specified dropout voltage still meet the 100mA output current requirement and 30V input rating. Consult manufacturer datasheets for detailed dropout voltage curves if this parameter is critical to your application.

Q: Is MC78L05ACPG suitable for -40°C applications?

A: No. MC78L05ACPG operates from 0°C minimum, not -40°C. Use MC78L05ABPG or NCV78L05ABPG for full -40°C to 125°C range.

Q: What does the NCV prefix on NCV78L05ABPG indicate?

A: The NCV prefix indicates automotive qualification to AEC-Q100 standard. This part is suitable for automotive and high-reliability applications requiring automotive-grade components.

Q: Can I use UA78L05ACLPM as a substitute?

A: UA78L05ACLPM is not recommended. It has reduced maximum input voltage (20V vs. 30V required) and significantly higher dropout voltage (1.7V @ 40mA vs. 0.6V), making it unsuitable for applications designed around the LP2950-03BZ specifications. Additionally, it carries Last Time Buy status.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts are ROHS3 compliant. The original LP2950-03BZ is RoHS non-compliant, making substitution beneficial for RoHS-regulated applications.