LP2950CZ-3.0RA Equivalent & Substitute Parts

Part Overview

The LP2950CZ-3.0RA is a linear voltage regulator IC from onsemi, delivering a fixed 3V positive output at 100mA in a TO-92-3 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part 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 full load.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.45V @ 100mA
Quiescent Current	120 µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-92-3 (TO-226)
Protection Features	Over Current, Over Temperature
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the LP2950CZ-3.0RA is determined by strict equivalence across the following critical parameters: fixed 3V output voltage, 100mA output current capability, 30V maximum input voltage, TO-92-3 package compatibility, through-hole mounting, and operating temperature range of -40°C to 125°C. All substitute parts maintain these core electrical and mechanical specifications.

Substitutes are grouped into two categories:

Direct Manufacturer Equivalents (onsemi): Parts sharing identical base product number (LP2950) with matching electrical specifications and package type, differing only in packaging format or product status.

Cross-Manufacturer Equivalents (Texas Instruments): Parts with identical electrical performance and package compatibility but from alternative manufacturers, suitable for applications where multi-source qualification is required.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Dropout Voltage (Max)	Quiescent Current	Package	Product Status	RoHS Compliance
LP2950CZ-3.0RA	onsemi	3V	100mA	0.45V @ 100mA	120 µA	TO-92-3	Obsolete	Non-compliant
LP2950CZ-3.0RAG	onsemi	3V	100mA	0.45V @ 100mA	120 µA	TO-92-3	Active	ROHS3 Compliant
LP2950ACZ-3.0RAG	onsemi	3V	100mA	0.45V @ 100mA	120 µA	TO-92-3	Active	ROHS3 Compliant
LP2950-30LP	Texas Instruments	3V	100mA	0.6V @ 100mA	120 µA	TO-92-3	Last Time Buy	ROHS3 Compliant
LP2950-30LPR	Texas Instruments	3V	100mA	0.6V @ 100mA	120 µA	TO-92-3	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production: LP2950CZ-3.0RAG or LP2950ACZ-3.0RAG are the primary recommendations. Both are active onsemi products with ROHS3 compliance, identical electrical specifications to the obsolete LP2950CZ-3.0RA, and established supply availability. LP2950CZ-3.0RAG is supplied in cut tape packaging; LP2950ACZ-3.0RAG offers the same specifications with alternative qualification grade.

For Multi-Source Qualification: LP2950-30LP and LP2950-30LPR from Texas Instruments provide functional equivalence with identical output voltage, current, and package type. Both carry Last Time Buy status and ROHS3 compliance. The LP2950-30LPR variant includes short-circuit protection in addition to over-current and over-temperature protection. Dropout voltage is 0.6V at 100mA, compared to 0.45V for onsemi variants; this difference is acceptable in applications where the additional 0.15V margin does not impact system performance.

For Legacy System Support: All listed substitutes maintain pin-compatible TO-92-3 packages and identical electrical performance within specified tolerances, enabling direct board-level replacement without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can LP2950-30LP or LP2950-30LPR be used as direct replacements for LP2950CZ-3.0RA?

A: Yes. Both Texas Instruments parts are pin-compatible and deliver the same 3V fixed output at 100mA with identical quiescent current and operating temperature range. The 0.15V higher dropout voltage (0.6V vs. 0.45V) must be verified against your input voltage margin requirements.

Q: What is the difference between LP2950CZ-3.0RAG and LP2950ACZ-3.0RAG?

A: Both are onsemi active products with identical electrical specifications and TO-92-3 packaging. The difference lies in qualification grade and internal design variant (C-grade vs. A-grade). Both are ROHS3 compliant and suitable for new designs.

Q: Why is the LP2950CZ-3.0RA marked obsolete?

A: The part has reached end-of-life status. Active equivalents LP2950CZ-3.0RAG and LP2950ACZ-3.0RAG provide identical functionality with current manufacturing support and improved compliance certifications.

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

A: All listed substitutes use TO-92-3 through-hole packages. Packaging format (bulk, cut tape, reel) varies by part number and supplier. Verify packaging availability with your distributor for production requirements.

Q: Does the addition of short-circuit protection in LP2950-30LPR affect compatibility?

A: No. Short-circuit protection is an additional safety feature that does not alter electrical performance or pin compatibility. It provides enhanced protection without requiring circuit modifications.

Q: What compliance certifications apply to all substitute parts?

A: All active and Last Time Buy substitutes carry ROHS3 compliance and REACH Unaffected status. The obsolete LP2950CZ-3.0RA is RoHS non-compliant; migration to compliant alternatives is recommended for new production.

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