LP2950ACN-L-5-0 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LP2950ACN-L-5-0 is a linear voltage regulator IC manufactured by MaxLinear, Inc., designed to provide a fixed 5V positive 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 new designs and ongoing production requirements. The regulator features over-current and over-temperature protection, making it suitable for applications requiring stable 5V regulation from input sources up to 30V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Quiescent Current (Iq)	170 µA
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LP2950ACN-L-5-0 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 5V fixed
Output current capability: 100mA minimum
Input voltage rating: 30V maximum
Package type: TO-92-3 (TO-226AA) through-hole configuration
Operating temperature range: -40°C to 125°C minimum
Protection features: Over-current and over-temperature protection

Substitute parts are grouped into two categories based on product status and availability:

Category 1: Active Status Parts – Recommended for new designs and ongoing production. These parts are currently manufactured and supported by their respective suppliers.

Category 2: Not For New Designs – Suitable only for legacy system maintenance and repair where direct compatibility is required.

All substitute parts maintain electrical compatibility within the specified parameter ranges and are housed in identical or functionally equivalent TO-92-3 packages suitable for direct board-level replacement.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 100mA	Quiescent Current	Package	Operating Temp Range	Product Status
LP2950ACN-L-5-0	MaxLinear, Inc.	5V	100mA	30V	0.45V	170 µA	TO-92-3	-40°C ~ 125°C	Obsolete
LP2950ACZ-5.0/NOPB	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Active
L78L05ABZ	STMicroelectronics	5V	100mA	30V	Not specified	5.5 mA	TO-92-3	-40°C ~ 125°C	Active
L78L05ACZ	STMicroelectronics	5V	100mA	30V	Not specified	5.5 mA	TO-92-3	0°C ~ 125°C	Active
L78L05CZ	STMicroelectronics	5V	100mA	30V	Not specified	5.5 mA	TO-92-3	0°C ~ 125°C	Not For New Designs
LP2950ACZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Active
LP2950ACZ-5.0G	onsemi	5V	100mA	30V	0.45V	120 µA	TO-92-3	-40°C ~ 125°C	Active
LP2950CZ-5.0/LFT1	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Active
LP2950CZ-5.0/LFT3	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Active
LP2950CZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V	120 µA	TO-92-3	-40°C ~ 125°C	Active
LP2950CZ-5.0G	onsemi	5V	100mA	30V	0.45V	120 µA	TO-92-3	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Substitutes for Active Production:

For new designs and ongoing production, LP2950ACZ-5.0/NOPB (Texas Instruments) and LP2950ACZ-5.0G (onsemi) are the preferred direct replacements. Both maintain the original electrical specifications, operate across the full -40°C to 125°C temperature range, and carry ROHS3 compliance certification. These parts are actively manufactured and widely available.

Alternative Active Options:

L78L05ABZ and L78L05ACZ (STMicroelectronics) provide functional equivalence with identical output voltage and current ratings. L78L05ABZ supports the full -40°C to 125°C operating range, while L78L05ACZ operates from 0°C to 125°C. Both include enhanced protection features (short-circuit protection in addition to over-current and over-temperature) and carry ROHS3 compliance. The L78L05CZ variant is classified as "Not For New Designs" and should be avoided for new applications.

Packaging Considerations:

All substitute parts are supplied in TO-92-3 (TO-226AA) through-hole packages, ensuring direct mechanical compatibility with existing PCB layouts. Texas Instruments variants are available in both bulk and cut-tape packaging options. onsemi parts are supplied in bulk packaging. STMicroelectronics parts are supplied in bulk packaging.

Compliance and Certification:

All active substitute parts carry ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements. The original LP2950ACN-L-5-0 carries MSL 1 (Unlimited) moisture sensitivity rating; active substitutes maintain equivalent or superior moisture handling characteristics.

Frequently Asked Questions (FAQ)

Q: Can LP2950ACZ-5.0/NOPB directly replace LP2950ACN-L-5-0 on existing boards?

A: Yes. Both parts deliver 5V at 100mA in TO-92-3 packages with identical pinouts. The dropout voltage specification differs slightly (0.6V versus 0.45V), but this remains within acceptable operating margins for most applications. Quiescent current is lower in the substitute (120 µA versus 170 µA), which improves efficiency.

Q: What is the difference between L78L05ABZ and L78L05ACZ?

A: Both are STMicroelectronics L78L05 series regulators with identical electrical performance. The primary difference is operating temperature range: L78L05ABZ operates from -40°C to 125°C, while L78L05ACZ operates from 0°C to 125°C. Select L78L05ABZ for applications requiring full military-grade temperature coverage.

Q: Are Texas Instruments LP2950 variants interchangeable with onsemi LP2950 variants?

A: Yes, within the specified electrical parameters. Both manufacturers' LP2950 variants deliver 5V at 100mA in TO-92-3 packages. Texas Instruments parts are available in cut-tape packaging; onsemi parts are supplied in bulk. Dropout voltage specifications are identical (0.45V for onsemi, 0.6V for Texas Instruments LP2950ACZ variants).

Q: Why is L78L05CZ marked "Not For New Designs"?

A: L78L05CZ carries a "Not For New Designs" status from STMicroelectronics, indicating the manufacturer is transitioning away from this variant. While functionally equivalent to L78L05ABZ and L78L05ACZ, it should be used only for legacy system maintenance and repair where direct compatibility is required.

Q: What packaging options are available for substitute parts?

A: Texas Instruments LP2950 variants are available in cut-tape (CT) and bulk packaging. onsemi LP2950 variants are supplied in bulk packaging. STMicroelectronics L78L05 variants are supplied in bulk packaging. All parts are housed in TO-92-3 through-hole packages suitable for manual and automated assembly.

Q: Do all substitute parts include short-circuit protection?

A: No. The original LP2950ACN-L-5-0 includes over-current and over-temperature protection. Texas Instruments LP2950 variants include over-current and over-temperature protection, with some variants adding short-circuit protection. STMicroelectronics L78L05 variants include over-current, over-temperature, and short-circuit protection. Verify specific protection requirements for your application.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts carry ROHS3 compliance certification. The original LP2950ACN-L-5-0 does not specify ROHS status due to its obsolete classification. Current production substitutes meet modern environmental and regulatory requirements.

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