LP2950ACZ-5.0RA Equivalent & Substitute Parts

Part Overview

The LP2950ACZ-5.0RA is a linear voltage regulator IC from onsemi, delivering a fixed 5V positive 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 production continuity. The device provides over-current and over-temperature protection suitable for low-power applications requiring stable 5V regulation from input sources up to 30V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Quiescent Current (Iq)	120 µA
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-226-3, TO-92-3 Long Body (Formed Leads)
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution for the LP2950ACZ-5.0RA is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 100mA
Maximum input voltage of 30V
TO-92-3 package with through-hole mounting
Operating temperature range of -40°C to 125°C
Over-current and over-temperature protection

Parts are grouped into three categories:

Direct Manufacturer Equivalent: LP2950ACZ-5.0RAG (onsemi) — identical electrical specifications with active product status and improved RoHS3 compliance.

Parametric Equivalents: LP2950CZ-5.0RAG and LP2950CZ-5.0RPG (onsemi) — match all critical electrical parameters and package requirements with active status.

Similar Cross-Manufacturer Parts: L78L05ABZ-AP, L78L05ABZ-TR (STMicroelectronics), LP2950-50LPRE3 (Texas Instruments), LP2950ACZ-5.0/LFT7, LP2950ACZ-5.0/NOPB, LP2950CZ-5.0/LFT1, and LP2950CZ-5.0/LFT3 (Texas Instruments) — meet electrical and package specifications with variations in quiescent current and dropout voltage characteristics.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Iq (µA)	Package	RoHS Status
LP2950ACZ-5.0RA	onsemi	Obsolete	5V	100mA	30V	0.45V @ 100mA	120	TO-92-3	Non-compliant
LP2950ACZ-5.0RAG	onsemi	Active	5V	100mA	30V	0.45V @ 100mA	120	TO-92-3	ROHS3 Compliant
LP2950CZ-5.0RAG	onsemi	Active	5V	100mA	30V	0.45V @ 100mA	120	TO-92-3	ROHS3 Compliant
LP2950CZ-5.0RPG	onsemi	Active	5V	100mA	30V	0.45V @ 100mA	120	TO-92-3	ROHS3 Compliant
L78L05ABZ-AP	STMicroelectronics	Active	5V	100mA	30V	Not specified	5500	TO-92-3	ROHS3 Compliant
L78L05ABZ-TR	STMicroelectronics	Active	5V	100mA	30V	Not specified	5500	TO-92-3	ROHS3 Compliant
LP2950-50LPRE3	Texas Instruments	Active	5V	100mA	30V	0.6V @ 100mA	120	TO-92-3	ROHS3 Compliant
LP2950ACZ-5.0/LFT7	Texas Instruments	Active	5V	100mA	30V	0.6V @ 100mA	120	TO-92-3	ROHS3 Compliant
LP2950ACZ-5.0/NOPB	Texas Instruments	Active	5V	100mA	30V	0.6V @ 100mA	120	TO-92-3	ROHS3 Compliant
LP2950CZ-5.0/LFT1	Texas Instruments	Active	5V	100mA	30V	0.6V @ 100mA	120	TO-92-3	ROHS3 Compliant
LP2950CZ-5.0/LFT3	Texas Instruments	Active	5V	100mA	30V	0.6V @ 100mA	120	TO-92-3	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection: LP2950ACZ-5.0RAG (onsemi) is the direct equivalent with active product status and ROHS3 compliance, providing the most seamless transition from the obsolete LP2950ACZ-5.0RA.

Secondary Selection: LP2950CZ-5.0RAG and LP2950CZ-5.0RPG (onsemi) are parametric equivalents with identical electrical performance and active status, suitable for applications where the specific part code variant is not critical.

Cross-Manufacturer Alternatives: Texas Instruments LP2950 variants (LP2950-50LPRE3, LP2950ACZ-5.0/LFT7, LP2950ACZ-5.0/NOPB, LP2950CZ-5.0/LFT1, LP2950CZ-5.0/LFT3) maintain electrical compatibility with slightly higher dropout voltage (0.6V vs. 0.45V) and are suitable for applications with adequate input voltage margin. STMicroelectronics L78L05ABZ variants (L78L05ABZ-AP, L78L05ABZ-TR) provide functional equivalence with significantly higher quiescent current (5.5mA vs. 120µA), appropriate for non-power-critical applications.

All recommended substitutes are ROHS3 compliant and maintain the TO-92-3 through-hole package format, ensuring mechanical and electrical compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP2950ACZ-5.0RA with LP2950ACZ-5.0RAG?

A: Yes. LP2950ACZ-5.0RAG is the direct manufacturer equivalent with identical electrical specifications, TO-92-3 package, and active product status. The primary difference is improved RoHS3 compliance.

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

A: Both manufacturers produce LP2950 regulators meeting the same 5V/100mA specifications. Texas Instruments variants show slightly higher dropout voltage (0.6V vs. 0.45V) and may have different supply current specifications. Both are functionally compatible in applications with adequate input voltage headroom.

Q: Why do STMicroelectronics L78L05 parts have much higher quiescent current?

A: The L78L05ABZ series has a quiescent current of 5.5mA compared to 120µA for LP2950 variants. This difference reflects different internal circuit design. L78L05 parts remain functionally equivalent for 5V/100mA regulation but consume more standby power. Select L78L05 only when quiescent current is not a design constraint.

Q: Are all substitute parts available in the same TO-92-3 package?

A: Yes. All listed substitutes use TO-226-3 or TO-92-3 through-hole packages with formed leads, ensuring mechanical compatibility with existing PCB layouts.

Q: What packaging options are available for these regulators?

A: Most substitutes are available in Cut Tape (CT) packaging. LP2950ACZ-5.0/NOPB is available in Bulk packaging. Verify packaging availability with your supplier for production requirements.

Q: Do all substitutes meet RoHS compliance?

A: All active substitutes listed are ROHS3 compliant. The original LP2950ACZ-5.0RA is RoHS non-compliant due to its obsolete status. Modern designs should specify ROHS3-compliant variants.

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