LP2950CZ-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2950CZ-5.0 is a linear voltage regulator IC from onsemi, classified as a Power Management (PMIC) component. It provides a fixed positive 5V output with 100mA current capacity in a TO-92-3 package. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional specification.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Output Voltage	5V
Current - Output	100mA
Voltage - Input (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-226-3, TO-92-3 Long Body
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution for the LP2950CZ-5.0 is determined by the following critical parameters:

Output voltage: 5V fixed
Output current capacity: 100mA minimum
Package type: TO-92-3 (TO-226-3) through-hole
Input voltage rating: 30V maximum
Operating temperature range: -40°C to 125°C
Protection features: Over current and over temperature protection

Substitute parts must match all these parameters to ensure functional equivalence in circuit applications. Parts are grouped by manufacturer and product status to facilitate selection based on availability and compliance requirements.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Current - Output	Voltage - Input (Max)	Voltage Dropout (Max)	Current - Quiescent (Iq)	Operating Temperature	Product Status	RoHS Status
LP2950CZ-5.0	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Obsolete	RoHS non-compliant
LP2950CZ-5.0G	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
L78L05ABZ	STMicroelectronics	5V	100mA	30V	Not specified	5.5 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950-50LPRE3	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950ACZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950ACZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	ROHS3 Compliant
LP2950CZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C ~ 125°C	Active	Not specified
UA78L05ACLPM	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	Not specified	0°C ~ 125°C	Last Time Buy	ROHS3 Compliant
UA78L05ACLPME3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	Not specified	0°C ~ 125°C	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and ongoing production, LP2950CZ-5.0G from onsemi is the direct equivalent with active product status and ROHS3 compliance. This part maintains identical electrical specifications to the original LP2950CZ-5.0 while offering improved regulatory compliance.

Texas Instruments LP2950 variants (LP2950-50LPRE3, LP2950ACZ-5.0/LFT7, LP2950ACZ-5.0/NOPB, LP2950CZ-5.0/NOPB) provide functional equivalence with active status and ROHS3 compliance. These parts feature slightly higher dropout voltage (0.6V vs 0.45V) but maintain all other critical parameters.

STMicroelectronics L78L05ABZ offers functional equivalence with active status and ROHS3 compliance. This part features lower quiescent current (5.5 mA vs 120 µA) and includes short circuit protection in addition to over current and over temperature protection.

Texas Instruments UA78L05ACLPM and UA78L05ACLPME3 are available but listed as Last Time Buy status. These parts have reduced input voltage rating (20V vs 30V) and higher dropout voltage (1.7V @ 40mA), making them suitable only for applications with lower input voltage requirements and narrower operating temperature range (0°C to 125°C vs -40°C to 125°C).

Frequently Asked Questions (FAQ)

Q: Can LP2950CZ-5.0G directly replace LP2950CZ-5.0 in existing designs?

A: Yes. LP2950CZ-5.0G maintains identical electrical specifications including 5V output, 100mA current capacity, 30V maximum input voltage, and -40°C to 125°C operating temperature range. The primary difference is ROHS3 compliance and active product status.

Q: What is the difference between LP2950 variants from different manufacturers?

A: All LP2950 variants meet the core functional requirements: 5V fixed output, 100mA capacity, TO-92-3 package, and -40°C to 125°C operation. Texas Instruments variants specify 0.6V dropout voltage versus onsemi's 0.45V. All active variants are ROHS3 compliant.

Q: Is L78L05ABZ a suitable replacement?

A: L78L05ABZ is functionally equivalent for applications requiring 5V, 100mA output in TO-92-3 package. It offers lower quiescent current and additional short circuit protection. However, dropout voltage is not specified in available data.

Q: Why should UA78L05ACLPM and UA78L05ACLPME3 be avoided for new designs?

A: These parts carry Last Time Buy status, indicating discontinued production. Additionally, they have reduced input voltage rating (20V maximum vs 30V) and higher dropout voltage (1.7V @ 40mA), limiting their application scope compared to active alternatives.

Q: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use TO-92-3 (TO-226-3) through-hole package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What compliance certifications apply to these parts?

A: Active substitute parts (LP2950CZ-5.0G, L78L05ABZ, and Texas Instruments LP2950 variants) are ROHS3 compliant. All parts listed are REACH unaffected and classified as EAR99 for export control purposes.

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