LP2950CZ-3.3 Equivalent & Substitute Parts

Part Overview

The LP2950CZ-3.3 is a linear voltage regulator IC from onsemi, delivering a fixed positive 3.3V output at 100mA in a TO-92-3 package. This part is classified as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. The device provides over-current and over-temperature protection across an operating range of -40°C to 125°C, with a maximum input voltage of 30V and dropout voltage of 0.45V at 100mA.

Substiute Parts

LP2950CZ-3.3

onsemiIn Stock: 2342LP2950CZ-3.3 Datasheet

Current PartRFQ

LP2950CZ-3.3G

onsemiIn Stock: 12849LP2950CZ-3.3G Datasheet

DirectRFQ

LP2950ACZ-3.3G

onsemiIn Stock: 3647LP2950ACZ-3.3G Datasheet

Parametric EquivalentRFQ

L78L33ABZ-AP

STMicroelectronicsIn Stock: 1680L78L33ABZ-AP Datasheet

SimilarRFQ

L78L33ACZ

STMicroelectronicsIn Stock: 6852L78L33ACZ Datasheet

SimilarRFQ

L78L33ACZ-AP

STMicroelectronicsIn Stock: 3303L78L33ACZ-AP Datasheet

SimilarRFQ

L78L33ACZTR

STMicroelectronicsIn Stock: 1187L78L33ACZTR Datasheet

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LP2950-33LPE3

Texas InstrumentsIn Stock: 2904LP2950-33LPE3 Datasheet

SimilarRFQ

LP2950-33LPRE3

Texas InstrumentsIn Stock: 35344LP2950-33LPRE3 Datasheet

SimilarRFQ

LP2950ACZ-3.3/NOPB

Texas InstrumentsIn Stock: 7441LP2950ACZ-3.3/NOPB Datasheet

SimilarRFQ

LP2950CZ-3.3/NOPB

Texas InstrumentsIn Stock: 6291LP2950CZ-3.3/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

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

Substitute parts are grouped into three categories based on manufacturer and product status alignment:

Direct Manufacturer Substitutes (onsemi): Parts from the same manufacturer with identical electrical specifications and active product status.

Parametric Equivalents (onsemi): Parts meeting all electrical and mechanical requirements with active status and improved compliance certifications.

Similar Cross-Manufacturer Alternatives: Parts from STMicroelectronics and Texas Instruments meeting core electrical specifications and package requirements, with varying quiescent current and dropout voltage characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LP2950CZ-3.3G or LP2950ACZ-3.3G (onsemi) are direct functional equivalents with identical electrical specifications, active product status, and ROHS3 compliance. These parts eliminate obsolescence risk while maintaining full compatibility with existing designs.

Secondary Recommendation: LP2950-33LPRE3 (Texas Instruments) offers active product status and ROHS3 compliance with equivalent electrical performance. The 0.6V dropout voltage at 100mA is marginally higher than the original 0.45V specification but remains within acceptable operating margins for most applications.

Alternative Consideration: L78L33ACZ-AP or L78L33ACZTR (STMicroelectronics) provide active status and ROHS3 compliance with identical package and output specifications. The lower quiescent current (5.5 mA versus 120 µA) offers improved power efficiency in low-current standby conditions. Operating temperature range begins at 0°C rather than -40°C, which may limit use in extended temperature applications.

All recommended substitutes maintain TO-92-3 through-hole package compatibility, 100mA output current capability, 3.3V fixed output voltage, and 30V maximum input voltage rating.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP2950CZ-3.3 with LP2950CZ-3.3G?

A: Yes. Both parts deliver identical electrical specifications: 3.3V fixed output, 100mA current, 0.45V dropout voltage at 100mA, and -40°C to 125°C operating range. The primary difference is product status (obsolete versus active) and RoHS compliance (non-compliant versus ROHS3 compliant). The LP2950CZ-3.3G is the direct active equivalent.

Q: What is the difference between onsemi and Texas Instruments LP2950 variants?

A: Both manufacturers produce LP2950 series regulators with identical output voltage and current ratings. The Texas Instruments versions (LP2950-33LPRE3, LP2950ACZ-3.3/NOPB, LP2950CZ-3.3/NOPB) specify a 0.6V dropout voltage at 100mA compared to onsemi's 0.45V. This 0.15V difference is acceptable for most applications but should be verified in designs with tight input voltage margins.

Q: Why do STMicroelectronics L78L33 parts have lower quiescent current?

A: The L78L33 series from STMicroelectronics exhibits 5.5 mA quiescent current versus 120 µA for LP2950 variants. This represents a different IC design approach. While lower quiescent current improves standby power efficiency, the L78L33 operating temperature range begins at 0°C rather than -40°C, restricting use in extended low-temperature environments.

Q: Are all substitute parts available in the same packaging options?

A: All listed substitutes use TO-92-3 through-hole packages. Packaging variants (Bulk, Cut Tape, Tray) differ by supplier and availability but do not affect electrical compatibility. Verify packaging requirements with your procurement process.

Q: Which substitute offers the best compliance profile?

A: All active substitute parts (LP2950CZ-3.3G, LP2950ACZ-3.3G, L78L33 series, and Texas Instruments LP2950 variants) are ROHS3 compliant and REACH unaffected. Compliance status is equivalent across all recommended alternatives.

Q: Can I use L78L33ACZ if my application requires -40°C operation?

A: No. The L78L33ACZ operating temperature range is 0°C to 125°C. For applications requiring -40°C minimum operating temperature, use LP2950CZ-3.3G, LP2950ACZ-3.3G, or Texas Instruments LP2950 variants, all rated -40°C to 125°C.