LP2950CZ-5.0/LFT8 Equivalent & Substitute Parts

Part Overview

The LP2950CZ-5.0/LFT8 is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 5V output at 100mA. This through-hole component operates across an input voltage range up to 30V with a maximum dropout voltage of 0.6V at full load current. The device includes over-current and over-temperature protection features and operates reliably across the industrial temperature range of -40°C to 125°C.

This part is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers including onsemi and STMicroelectronics, offering the same electrical performance with active product status and improved availability.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Dropout Voltage (Max)	0.6V @ 100mA
Quiescent Current	120 µA
Operating Temperature Range	-40°C to 125°C
Package Type	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LP2950CZ-5.0/LFT8 is determined by the following critical parameters:

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

Substitute parts are grouped into three categories based on manufacturer and product status:

Parametric Equivalents (Texas Instruments): LP2950ACZ-5.0/NOPB and LP2950CZ-5.0/NOPB maintain identical electrical specifications and packaging, with active product status and improved inventory availability.

Direct Manufacturer Alternatives (onsemi): LP2950CZ-5.0G, LP2950ACZ-5.0G, LP2950ACZ-5.0RAG, LP2950CZ-5.0RAG, and LP2950CZ-5.0RPG are onsemi-manufactured variants of the LP2950 base product. These devices deliver equivalent performance with dropout voltage of 0.45V @ 100mA and quiescent current of 120 µA. Packaging variants include bulk and cut-tape options with formed leads.

Cross-Manufacturer Alternatives: L78L05ABZ (STMicroelectronics) and MC78L05ACPG/MC78L05ABPG (onsemi) are industry-standard 5V linear regulators in TO-92-3 packages. These parts meet the same electrical requirements with active product status and high inventory availability.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temp	Package	Product Status
LP2950CZ-5.0/LFT8	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Obsolete
LP2950ACZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0G	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
LP2950ACZ-5.0G	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
LP2950ACZ-5.0RAG	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0RAG	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
LP2950CZ-5.0RPG	onsemi	5V	100mA	30V	0.45V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
L78L05ABZ	STMicroelectronics	5V	100mA	30V	Not Specified	5.5 mA	-40°C to 125°C	TO-92-3	Active
MC78L05ACPG	onsemi	5V	100mA	30V	Not Specified	6 mA	0°C to 125°C	TO-92-3	Active
MC78L05ABPG	onsemi	5V	100mA	30V	Not Specified	6 mA	-40°C to 125°C	TO-92-3	Active

Engineering Selection Recommendations

Primary Recommendation: LP2950ACZ-5.0/NOPB or LP2950CZ-5.0/NOPB (Texas Instruments). These parts are direct parametric equivalents manufactured by the original supplier with identical electrical specifications, packaging, and operating characteristics. Both are ROHS3 compliant and carry active product status with substantial inventory availability.

Secondary Recommendation: LP2950ACZ-5.0RAG or LP2950CZ-5.0RAG (onsemi). These onsemi variants deliver superior dropout voltage performance (0.45V vs. 0.6V) while maintaining all other electrical parameters. Cut-tape packaging with formed leads is suitable for automated assembly. Inventory availability exceeds 2,000 units. ROHS3 compliant.

Alternative Recommendation: L78L05ABZ (STMicroelectronics). This industry-standard 5V linear regulator meets all electrical requirements with active product status and exceptional inventory availability (55,100 units). Operating temperature range matches the original part. ROHS3 compliant. Quiescent current specification differs (5.5 mA vs. 120 µA), which may impact low-power applications.

Cross-Manufacturer Option: MC78L05ABPG (onsemi). This Motorola-compatible 5V regulator operates across the full industrial temperature range (-40°C to 125°C) with active product status. PSRR specification of 49dB at 120Hz provides additional noise rejection. Quiescent current of 6 mA differs from the original specification.

All recommended substitutes are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8542.39.0001, matching the regulatory profile of the original part.

Frequently Asked Questions (FAQ)

Q: Can LP2950ACZ-5.0/NOPB directly replace LP2950CZ-5.0/LFT8?

A: Yes. Both parts are Texas Instruments LP2950 regulators with identical 5V fixed output, 100mA current rating, 30V maximum input voltage, and TO-92-3 packaging. The primary difference is product status: the original is obsolete while the ACZ variant is active with improved availability.

Q: What is the difference between LP2950 variants from onsemi (LP2950CZ-5.0G, LP2950ACZ-5.0G, etc.)?

A: All onsemi LP2950 variants deliver the same electrical performance: 5V output, 100mA current, 30V input maximum, and -40°C to 125°C operating range. Differences are in packaging format (bulk vs. cut-tape) and lead configuration (straight vs. formed). The dropout voltage is 0.45V, which is superior to the original 0.6V specification.

Q: Why does L78L05ABZ have different quiescent current (5.5 mA vs. 120 µA)?

A: L78L05ABZ is a different regulator architecture from the LP2950 series. While it meets the same output voltage, current, and temperature specifications, its internal design results in higher quiescent current consumption. This difference is significant in battery-powered or low-power standby applications where the original 120 µA specification is critical.

Q: Is MC78L05ACPG suitable for the full -40°C to 125°C temperature range?

A: MC78L05ACPG operates from 0°C to 125°C, which does not cover the full -40°C lower limit of the original part. MC78L05ABPG extends the operating range to -40°C to 125°C and is the appropriate choice for applications requiring full industrial temperature coverage.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance certification, matching the regulatory status of the original LP2950CZ-5.0/LFT8.

Q: What packaging options are available for onsemi LP2950 variants?

A: onsemi offers LP2950 regulators in bulk packaging (LP2950CZ-5.0G, LP2950ACZ-5.0G) and cut-tape packaging with formed leads (LP2950ACZ-5.0RAG, LP2950CZ-5.0RAG, LP2950CZ-5.0RPG). All use TO-92-3 package configuration suitable for through-hole mounting.

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