LP2950CZ-3.3RA Equivalent & Substitute Parts

Part Overview

The LP2950CZ-3.3RA is a linear voltage regulator IC manufactured by onsemi, delivering a fixed 3.3V output at 100mA in a TO-92-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides positive fixed output regulation with integrated over-current and over-temperature protection across an operating range of -40°C to 125°C.

Substiute Parts

LP2950CZ-3.3RA

onsemiIn Stock: 14229LP2950CZ-3.3RA Datasheet

Current PartRFQ

LP2950CZ-3.3RAG

onsemiIn Stock: 2207LP2950CZ-3.3RAG Datasheet

DirectRFQ

LP2950ACZ-3.3RAG

onsemiIn Stock: 1176LP2950ACZ-3.3RAG Datasheet

Parametric EquivalentRFQ

L78L33ABZ-AP

STMicroelectronicsIn Stock: 1680L78L33ABZ-AP Datasheet

SimilarRFQ

L78L33ACZ

STMicroelectronicsIn Stock: 6852L78L33ACZ Datasheet

SimilarRFQ

L78L33ACZ-AP

STMicroelectronicsIn Stock: 3303L78L33ACZ-AP Datasheet

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L78L33ACZTR

STMicroelectronicsIn Stock: 1187L78L33ACZTR Datasheet

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LP2950-33LPRE3

Texas InstrumentsIn Stock: 35344LP2950-33LPRE3 Datasheet

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LP2950CZ-3.3/LFT3

Texas InstrumentsIn Stock: 12881LP2950CZ-3.3/LFT3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the LP2950CZ-3.3RA is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• Output current capability of 100mA
• Maximum input voltage of 30V
• TO-92-3 through-hole package compatibility
• Operating temperature range of -40°C to 125°C
• Protection against over-current and over-temperature conditions

Substitute parts are grouped into three categories:

Direct Manufacturer Equivalents maintain identical electrical specifications and packaging from onsemi, differing only in product status or packaging format.

Parametric Equivalents provide matching electrical performance and package type from onsemi with active product status.

Similar Cross-Manufacturer Parts deliver equivalent functionality from alternative manufacturers (STMicroelectronics, Texas Instruments) with identical or superior electrical characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement with Active Status: LP2950CZ-3.3RAG and LP2950ACZ-3.3RAG are the primary recommendations. Both are onsemi products with identical electrical specifications to the obsolete LP2950CZ-3.3RA and carry active product status with ROHS3 compliance. These parts require no design modification and maintain full compatibility with existing layouts and schematics.

For Cross-Manufacturer Substitution: The STMicroelectronics L78L33 series (L78L33ABZ-AP, L78L33ACZ, L78L33ACZ-AP, L78L33ACZTR) provides functional equivalence with active product status and ROHS3 compliance. These devices deliver the same 3.3V output at 100mA in TO-92-3 packaging. The L78L33ABZ-AP maintains the full -40°C to 125°C operating range, while L78L33ACZ variants operate from 0°C to 125°C. Quiescent current is lower at 5.5 mA compared to 120 µA in the original design.

For Texas Instruments Alternatives: LP2950-33LPRE3 and LP2950CZ-3.3/LFT3 maintain the LP2950 base product lineage with active status and ROHS3 compliance. Both deliver 3.3V at 100mA across -40°C to 125°C. Dropout voltage is specified at 0.6V @ 100mA, compared to 0.45V in the original part.

All substitute options are through-hole mounted in TO-92-3 packages and maintain compatibility with the original design's mechanical and electrical requirements.

Frequently Asked Questions (FAQ)

Q: Can I use L78L33ACZ as a direct replacement for LP2950CZ-3.3RA? A: Yes. Both devices deliver 3.3V at 100mA in TO-92-3 packaging with identical pin configuration. The L78L33ACZ is manufactured by STMicroelectronics and carries active product status with ROHS3 compliance. The operating temperature range differs (0°C to 125°C versus -40°C to 125°C), so verify your application's minimum temperature requirement.

Q: What is the difference between LP2950CZ-3.3RAG and LP2950ACZ-3.3RAG? A: Both parts are onsemi products with identical electrical specifications and active product status. The difference lies in the device grade designation (CZ versus ACZ). Both are suitable replacements for the obsolete LP2950CZ-3.3RA and carry ROHS3 compliance.

Q: Are there any performance differences between onsemi and STMicroelectronics versions? A: The STMicroelectronics L78L33 series has lower quiescent current (5.5 mA versus 120 µA) and includes short-circuit protection in addition to over-current and over-temperature protection. The onsemi LP2950 series specifies dropout voltage at 0.45V, while Texas Instruments versions specify 0.6V. Select based on your application's power budget and protection requirements.

Q: Can I use parts with different operating temperature ranges? A: Only if your application operates within the substitute part's specified range. The L78L33ACZ operates from 0°C to 125°C, while the original LP2950CZ-3.3RA and most substitutes operate from -40°C to 125°C. Verify your minimum operating temperature before selection.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts listed carry ROHS3 compliance. The original LP2950CZ-3.3RA is RoHS non-compliant due to its obsolete status. If RoHS compliance is required, select from the active alternatives.

Q: What packaging formats are available? A: All parts are available in TO-92-3 through-hole packages. Packaging options vary by part number (bulk, cut tape, or tape and reel). Verify packaging availability with your supplier for your specific procurement requirements.