LP2950CZ-5.0RA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2950CZ-5.0RA is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 5V output at 100mA in a TO-92-3 package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The LP2950CZ-5.0RA provides over-current and over-temperature protection with a maximum input voltage of 30V and a dropout voltage of 0.45V at 100mA.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (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 of the LP2950CZ-5.0RA is determined by the following critical parameters:

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

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (onsemi): Parts LP2950CZ-5.0RAG and LP2950ACZ-5.0RAG maintain identical electrical specifications and packaging, with the primary difference being product status (active vs. obsolete) and RoHS compliance level.

Parametric Equivalents (onsemi & Texas Instruments): Parts LP2950CZ-5.0RPG and LP2950CZ-5.0/LFT series (Texas Instruments) provide identical output voltage, current, and package specifications. Texas Instruments variants specify a dropout voltage of 0.6V @ 100mA and supply current of 14mA, compared to the original 0.45V and 12mA.

Similar Cross-Manufacturer Alternatives: L78L05ABZ-AP and L78L05ABZ-TR (STMicroelectronics) and LP2950-50LPRE3 (Texas Instruments) meet the core electrical requirements but exhibit variations in quiescent current and dropout voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Iq (µA)	Supply Current (Max)	Package	Product Status	RoHS Status
LP2950CZ-5.0RA	onsemi	5V	100mA	30V	0.45V @ 100mA	120	12mA	TO-92-3	Obsolete	RoHS non-compliant
LP2950CZ-5.0RAG	onsemi	5V	100mA	30V	0.45V @ 100mA	120	12mA	TO-92-3	Active	ROHS3 Compliant
LP2950ACZ-5.0RAG	onsemi	5V	100mA	30V	0.45V @ 100mA	120	12mA	TO-92-3	Active	ROHS3 Compliant
LP2950CZ-5.0RPG	onsemi	5V	100mA	30V	0.45V @ 100mA	120	12mA	TO-92-3	Active	ROHS3 Compliant
L78L05ABZ-AP	STMicroelectronics	5V	100mA	30V	Not specified	5500	6mA	TO-92-3	Active	ROHS3 Compliant
L78L05ABZ-TR	STMicroelectronics	5V	100mA	30V	Not specified	5500	6mA	TO-92-3	Active	ROHS3 Compliant
LP2950-50LPRE3	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120	14mA	TO-92-3	Active	ROHS3 Compliant
LP2950CZ-5.0/LFT1	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120	14mA	TO-92-3	Active	ROHS3 Compliant
LP2950CZ-5.0/LFT3	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120	14mA	TO-92-3	Active	ROHS3 Compliant
LP2950CZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120	14mA	TO-92-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility): LP2950CZ-5.0RAG and LP2950ACZ-5.0RAG are direct onsemi equivalents with identical electrical specifications and active product status. Both are ROHS3 compliant and maintain the same dropout voltage and quiescent current characteristics as the original LP2950CZ-5.0RA. LP2950CZ-5.0RPG provides equivalent performance with active status and ROHS3 compliance.

Tier 2 - Parametric Equivalents (Acceptable Substitution): Texas Instruments LP2950CZ-5.0/LFT series (LFT1, LFT3, LFT7) and LP2950-50LPRE3 deliver the same output voltage and current specifications. These parts exhibit a 0.15V higher dropout voltage (0.6V vs. 0.45V) and 2mA higher supply current (14mA vs. 12mA). These differences are acceptable for applications where the input voltage margin and power dissipation budget accommodate the variance.

Tier 3 - Cross-Manufacturer Alternatives (Limited Compatibility): STMicroelectronics L78L05ABZ-AP and L78L05ABZ-TR meet the core voltage and current requirements but exhibit significantly higher quiescent current (5.5mA vs. 120µA). These parts are suitable only for applications where low quiescent current is not a design constraint. Both are ROHS3 compliant and active.

All substitute parts maintain the TO-92-3 through-hole package, operating temperature range of -40°C to 125°C, and protection features (over-current and over-temperature). All active alternatives are ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP2950CZ-5.0RA with LP2950CZ-5.0RAG? A: Yes. LP2950CZ-5.0RAG is a direct onsemi equivalent with identical electrical specifications, package, and operating characteristics. The primary difference is that LP2950CZ-5.0RAG is active and ROHS3 compliant, whereas the original is obsolete and RoHS non-compliant.

Q: What is the difference between onsemi and Texas Instruments LP2950 variants? A: onsemi variants (LP2950CZ-5.0RAG, LP2950ACZ-5.0RAG, LP2950CZ-5.0RPG) maintain a dropout voltage of 0.45V @ 100mA and supply current of 12mA. Texas Instruments variants (LP2950CZ-5.0/LFT1, LP2950CZ-5.0/LFT3, LP2950CZ-5.0/LFT7, LP2950-50LPRE3) specify 0.6V dropout voltage and 14mA supply current. Both meet the 5V output and 100mA current requirements.

Q: Why do STMicroelectronics L78L05ABZ parts have higher quiescent current? A: The L78L05ABZ series exhibits a quiescent current of 5.5mA compared to 120µA in the LP2950 series. This is a fundamental design difference between the two product families. The L78L05ABZ is suitable for applications where low quiescent current is not critical.

Q: Are all substitute parts available in the same TO-92-3 package? A: Yes. All listed substitute parts are packaged in TO-226-3 or TO-92-3 with through-hole mounting, maintaining mechanical and electrical compatibility with the original LP2950CZ-5.0RA.

Q: Which substitute part has the best RoHS compliance status? A: All active substitute parts (LP2950CZ-5.0RAG, LP2950ACZ-5.0RAG, LP2950CZ-5.0RPG, L78L05ABZ-AP, L78L05ABZ-TR, LP2950-50LPRE3, and all Texas Instruments LP2950CZ-5.0/LFT variants) are ROHS3 compliant. The original LP2950CZ-5.0RA is RoHS non-compliant.

Q: Can I use LP2950CZ-5.0/LFT7 in a battery-powered application? A: The LP2950CZ-5.0/LFT7 has a quiescent current of 120µA, identical to the original LP2950CZ-5.0RA. This makes it suitable for battery-powered applications. However, the 0.6V dropout voltage (vs. 0.45V in the original) requires verification that your input voltage margin is sufficient.

Q: What is the inventory status of substitute parts? A: LP2950CZ-5.0RAG has 2,191 units in stock. LP2950ACZ-5.0RAG has 100,200 units. LP2950CZ-5.0RPG has 2,626 units. L78L05ABZ-AP has 7,173 units. L78L05ABZ-TR has 23,389 units. LP2950-50LPRE3 has 37,200 units. Texas Instruments LP2950CZ-5.0/LFT variants range from 2,100 to 8,373 units.

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