LP2950CZ-5.0RP Equivalent & Substitute Parts

Part Overview

The LP2950CZ-5.0RP is a linear voltage regulator IC from onsemi, delivering a fixed 5V output at 100mA in a TO-92-3 package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The LP2950CZ-5.0RP provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for applications requiring low-current 5V power management in through-hole configurations.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	LP2950CZ-5.0RP
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.45V @ 100mA
Quiescent Current	120 µA
Package	TO-92-3 (TO-226)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

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

Fixed output voltage of 5V
Output current capability of 100mA
Maximum input voltage of 30V
Through-hole TO-92-3 package compatibility
Operating temperature range of -40°C to 125°C
Positive fixed output configuration with single regulator

Substitute parts must maintain identical electrical specifications for output voltage, current rating, and input voltage limits. Package compatibility (TO-92-3) is mandatory for direct board-level replacement. All listed substitutes meet these core requirements while offering improved product status (Active vs. Obsolete) and enhanced compliance certifications.

Parameter Comparison

Parameter	LP2950CZ-5.0RP (onsemi)	LP2950CZ-5.0RPG (onsemi)	L78L05ABZ-AP (STMicroelectronics)	L78L05ABZ-TR (STMicroelectronics)	LP2950-50LPRE3 (Texas Instruments)	LP2950CZ-5.0/LFT1 (Texas Instruments)	LP2950CZ-5.0/LFT3 (Texas Instruments)	LP2950CZ-5.0/LFT7 (Texas Instruments)
Output Voltage	5V	5V	5V	5V	5V	5V	5V	5V
Output Current	100mA	100mA	100mA	100mA	100mA	100mA	100mA	100mA
Input Voltage (Max)	30V	30V	30V	30V	30V	30V	30V	30V
Dropout Voltage (Max)	0.45V @ 100mA	0.45V @ 100mA	Not specified	Not specified	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA
Quiescent Current	120 µA	120 µA	5.5 mA	5.5 mA	120 µA	120 µA	120 µA	120 µA
Package	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Operating Temperature	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit

Engineering Selection Recommendations

Direct Manufacturer Substitutes (onsemi): LP2950CZ-5.0RPG is the active production equivalent from onsemi. It maintains identical electrical specifications and package configuration while offering ROHS3 compliance and active product status. This is the preferred substitute for designs requiring onsemi sourcing continuity.

Cross-Manufacturer Substitutes (STMicroelectronics): L78L05ABZ-AP and L78L05ABZ-TR from STMicroelectronics provide functional equivalence with identical output voltage, current, and package specifications. Both parts are ROHS3 compliant and actively produced. The L78L05 series exhibits lower quiescent current (5.5 mA vs. 120 µA) and includes short-circuit protection. L78L05ABZ-TR offers higher inventory availability (23,389 pcs) compared to L78L05ABZ-AP (7,173 pcs).

Cross-Manufacturer Substitutes (Texas Instruments): LP2950-50LPRE3, LP2950CZ-5.0/LFT1, LP2950CZ-5.0/LFT3, and LP2950CZ-5.0/LFT7 maintain the LP2950 base product lineage with ROHS3 compliance and active status. These parts feature slightly higher dropout voltage (0.6V vs. 0.45V) but preserve quiescent current specifications. LP2950CZ-5.0/LFT1 and LP2950CZ-5.0/LFT7 include short-circuit protection. LP2950-50LPRE3 offers the highest inventory availability (37,200 pcs).

Compliance Considerations: All substitute parts are ROHS3 compliant, addressing the non-compliance status of the original LP2950CZ-5.0RP. Selection should prioritize active product status and compliance requirements for new designs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP2950CZ-5.0RP with LP2950CZ-5.0RPG? A: Yes. LP2950CZ-5.0RPG is the active production variant from the same manufacturer with identical electrical and package specifications. It is the recommended direct substitute.

Q: What is the difference between onsemi and Texas Instruments LP2950 variants? A: Both maintain the same output voltage (5V), current (100mA), and package (TO-92-3). Texas Instruments variants feature slightly higher dropout voltage (0.6V vs. 0.45V) but are functionally equivalent for most applications. Selection depends on sourcing availability and compliance requirements.

Q: Why do STMicroelectronics L78L05 parts have lower quiescent current? A: The L78L05 series is a different product line with different internal design. While quiescent current is lower (5.5 mA vs. 120 µA), all other critical parameters match the LP2950CZ-5.0RP, making it a valid functional substitute.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitutes are ROHS3 compliant, unlike the original LP2950CZ-5.0RP which is RoHS non-compliant.

Q: Can I use these substitutes in existing designs without PCB modification? A: Yes. All substitute parts use the TO-92-3 package with identical pin configuration and through-hole mounting, enabling direct board-level replacement without layout changes.

Q: Which substitute offers the best inventory availability? A: LP2950-50LPRE3 from Texas Instruments offers the highest inventory (37,200 pcs), followed by L78L05ABZ-TR from STMicroelectronics (23,389 pcs).

Q: Do all substitutes include short-circuit protection? A: No. L78L05ABZ-AP, L78L05ABZ-TR, LP2950CZ-5.0/LFT1, and LP2950CZ-5.0/LFT7 include short-circuit protection. LP2950CZ-5.0RPG, LP2950-50LPRE3, and LP2950CZ-5.0/LFT3 provide over-current and over-temperature protection only.

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