LP2950ACZ-5.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2950ACZ-5.0 is a linear voltage regulator IC from onsemi, 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 part delivers regulated power with integrated over-current and over-temperature protection across an operating temperature range of -40°C to 125°C.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the LP2950ACZ-5.0 are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

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

Grouping Logic:

Direct Equivalents maintain identical electrical specifications and package configuration, differing only in manufacturer or packaging format (bulk vs. tape).

Similar Substitutes meet all critical electrical parameters and package requirements but may have minor variations in dropout voltage, quiescent current, or additional protection features that do not compromise functionality in the target application.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status	RoHS Compliance
LP2950ACZ-5.0	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	TO-92-3	Obsolete	Non-compliant
LP2950ACZ-5.0G	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	TO-92-3	Active	ROHS3 Compliant
LP2950ACZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	TO-92-3	Active	ROHS3 Compliant
L78L05ABZ	STMicroelectronics	5V	100mA	30V	Not specified	5.5 mA	TO-92-3	Active	ROHS3 Compliant
LP2950CZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	TO-92-3	Active	Not specified
UA78L05ACLPM	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	Not specified	TO-92-3	Last Time Buy	ROHS3 Compliant
UA78L05ACLPME3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	Not specified	TO-92-3	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Preferred): LP2950ACZ-5.0G from onsemi is the primary direct equivalent. It maintains identical electrical specifications to the obsolete LP2950ACZ-5.0 while offering active product status and ROHS3 compliance. This part is recommended for new designs and production continuity.

For Active Product Status with Minor Parameter Variation: LP2950ACZ-5.0/NOPB from Texas Instruments and LP2950CZ-5.0/NOPB from Texas Instruments are functionally equivalent alternatives with active product status. Both maintain the 5V output, 100mA current capability, and TO-92-3 package. The dropout voltage specification is slightly higher at 0.6V compared to 0.45V, which remains acceptable for most applications within the 30V input range.

For Alternative Manufacturer Solutions: L78L05ABZ from STMicroelectronics meets all critical electrical and package requirements with active product status and ROHS3 compliance. This part offers higher inventory availability (55,100 units) and includes short-circuit protection in addition to over-current and over-temperature protection.

For Legacy System Maintenance: UA78L05ACLPM and UA78L05ACLPME3 from Texas Instruments are functionally compatible but carry Last Time Buy status. These parts feature a reduced maximum input voltage of 20V and higher dropout voltage of 1.7V @ 40mA. Selection of these parts is appropriate only when the application input voltage does not exceed 20V and the higher dropout voltage is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LP2950ACZ-5.0G be used as a direct replacement for the obsolete LP2950ACZ-5.0?

A: Yes. LP2950ACZ-5.0G maintains identical electrical specifications including 5V output, 100mA current capability, 0.45V dropout voltage, and TO-92-3 package configuration. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Q: What is the key difference between LP2950ACZ-5.0/NOPB and LP2950ACZ-5.0G?

A: Both are active products with identical output voltage, current, and package specifications. The LP2950ACZ-5.0/NOPB from Texas Instruments has a slightly higher dropout voltage specification of 0.6V @ 100mA compared to 0.45V for the onsemi part. Both are ROHS3 compliant and suitable for new designs.

Q: Can UA78L05ACLPM be used in applications requiring 30V input?

A: No. The UA78L05ACLPM has a maximum input voltage rating of 20V, compared to 30V for the LP2950ACZ-5.0. This part is suitable only for applications where the input voltage does not exceed 20V.

Q: What are the package compatibility considerations?

A: All listed substitute parts use the TO-92-3 (TO-226) through-hole package, ensuring mechanical and electrical compatibility with existing PCB layouts designed for the LP2950ACZ-5.0. No board redesign is required.

Q: Which substitute part offers the best inventory availability?

A: L78L05ABZ from STMicroelectronics has the highest inventory availability at 55,100 units in stock, compared to 2,778 units for LP2950ACZ-5.0G and 2,000 units for LP2950ACZ-5.0/NOPB.

Q: Are all substitute parts RoHS compliant?

A: Most substitute parts are ROHS3 compliant. The original LP2950ACZ-5.0 is RoHS non-compliant. LP2950CZ-5.0/NOPB has unspecified RoHS status. Verify compliance requirements for your specific application before selection.

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