LP2950-02YZ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2950-02YZ is a linear voltage regulator IC manufactured by Microchip Technology, designed to provide a fixed 5V positive output at 100mA in a TO-92-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The LP2950-02YZ operates across an input voltage range up to 30V with a maximum dropout voltage of 0.6V at 100mA and quiescent current of 150µA, suitable for low-power fixed voltage regulation in through-hole applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.6V @ 100mA
Quiescent Current	150µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
Output Configuration	Positive Fixed
Number of Regulators	1

Substitute Part Grouping Explanation

Substitute parts for the LP2950-02YZ are qualified based on the following critical parameters that determine functional equivalence:

Fixed 5V positive output voltage
100mA output current capability
Maximum input voltage of 30V
TO-92-3 package configuration for through-hole mounting
Operating temperature range of -40°C to 125°C
Active product status (preferred for new designs)

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in quiescent current, dropout voltage, and protection features are noted but do not prevent functional substitution when these parameters remain within acceptable design margins.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Operating Temperature	Package	Product Status
LP2950-02YZ	Microchip Technology	5V	100mA	30V	0.6V @ 100mA	150µA	-40°C to 125°C	TO-92-3	Obsolete
L78L05ABZ	STMicroelectronics	5V	100mA	30V	—	5.5mA	-40°C to 125°C	TO-92-3	Active
LP2950ACZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
LP2950ACZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
LP2950ACZ-5.0G	onsemi	5V	100mA	30V	0.45V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0/LFT1	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0/LFT3	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0G	onsemi	5V	100mA	30V	0.45V @ 100mA	120µA	-40°C to 125°C	TO-92-3	Active
MC78L05ABPG	onsemi	5V	100mA	30V	—	6mA	-40°C to 125°C	TO-92-3	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status with the exception of the LP2950-02YZ, which is obsolete. For new designs and ongoing production, active parts are preferred to ensure long-term availability and supply chain stability.

All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The LP2950 series variants from Texas Instruments and onsemi provide direct functional equivalence with the original part, maintaining identical dropout voltage specifications of 0.6V at 100mA. The onsemi LP2950ACZ-5.0G and LP2950CZ-5.0G variants offer improved dropout performance at 0.45V at 100mA.

The L78L05ABZ from STMicroelectronics and MC78L05ABPG from onsemi are functionally equivalent alternatives with different quiescent current characteristics. These parts maintain the same output voltage, current rating, input voltage range, and operating temperature specifications required for direct substitution.

Packaging variants (Cut Tape, Bulk) do not affect electrical performance and are selected based on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the LP2950-02YZ with any of the listed parts?

A: Yes. All listed parts maintain the critical electrical specifications: 5V fixed output, 100mA output current, 30V maximum input voltage, and TO-92-3 package configuration. Functional substitution is supported across all variants.

Q: What is the difference between LP2950ACZ and LP2950CZ variants?

A: Both variants are from Texas Instruments and maintain identical electrical specifications for the LP2950-02YZ substitution. The designation difference reflects internal grading or manufacturing process variations but does not affect functional equivalence for this application.

Q: Does packaging type (Cut Tape vs. Bulk) affect compatibility?

A: No. Packaging type affects procurement and assembly handling only. Electrical and mechanical specifications remain identical. Select based on your assembly process requirements.

Q: Why do some substitute parts have different quiescent current values?

A: Quiescent current variation is permitted within the design margins of this regulator category. The LP2950 series maintains 120µA to 150µA, while the L78L05 and MC78L05 series operate at 5.5mA to 6mA. Both ranges are acceptable for 5V 100mA fixed regulation applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: Which substitute offers the best dropout voltage performance?

A: The LP2950ACZ-5.0G and LP2950CZ-5.0G from onsemi provide 0.45V dropout at 100mA, compared to 0.6V for other LP2950 variants. This represents improved efficiency in low-input-voltage applications.

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