LP2950-30LP Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2950-30LP is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3V output at 100mA in a TO-92-3 through-hole package. This device operates across an input voltage range up to 30V with a maximum dropout voltage of 0.6V at 100mA and includes over-current and over-temperature protection. The part is classified as Last Time Buy, indicating end-of-life status. Equivalent and substitute parts are necessary to ensure design continuity and maintain supply chain reliability for applications requiring 3V regulated output in through-hole or surface-mount configurations.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the LP2950-30LP are categorized based on strict electrical and mechanical parameter matching:

Direct Electrical Equivalents (Same Output Current - 100mA): Parts maintaining identical 100mA output current, 3V fixed output, 30V maximum input voltage, and -40°C to 125°C operating temperature range with through-hole TO-92-3 packaging. These include LP2950CZ-3.0/NOPB, LP2950ACZ-3.0/NOPB, LP2950ACZ-3.0G, LP2950ACZ-3.0RAG, LP2950CZ-3.0G, and LP2950CZ-3.0RAG. Variations in dropout voltage (0.45V vs 0.6V) and quiescent current (120 µA) remain within acceptable tolerance for equivalent functionality.

Functional Upgrade (Higher Output Current - 150mA): The TPS70930DBVR provides enhanced current capability at 150mA while maintaining 3V output and 30V maximum input voltage. This part transitions to surface-mount SOT-23-5 packaging and includes additional protection features (Reverse Current, Under Voltage Lockout) and control features (Enable). This substitution is applicable only when surface-mount assembly is feasible and higher current capacity is acceptable.

Parameter Comparison

Parameter	LP2950-30LP	LP2950CZ-3.0/NOPB	LP2950ACZ-3.0/NOPB	LP2950ACZ-3.0G	LP2950ACZ-3.0RAG	LP2950CZ-3.0G	LP2950CZ-3.0RAG	TPS70930DBVR
Manufacturer	Texas Instruments	National Semiconductor	Texas Instruments	onsemi	onsemi	onsemi	onsemi	Texas Instruments
Output Voltage	3V	3V	3V	3V	3V	3V	3V	3V
Output Current	100mA	100mA	100mA	100mA	100mA	100mA	100mA	150mA
Input Voltage (Max)	30V	30V	30V	30V	30V	30V	30V	30V
Dropout Voltage (Max)	0.6V @ 100mA	0.6V @ 100mA	0.6V @ 100mA	0.45V @ 100mA	0.45V @ 100mA	0.45V @ 100mA	0.45V @ 100mA	1.4V @ 150mA
Quiescent Current	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA	120 µA	2.05 µA
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Package	TO-92-3	TO-92-3	TO-92-3	TO-92	TO-92	TO-92	TO-92	SOT-23-5
Product Status	Last Time Buy	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Through-Hole Applications with Identical Specifications: Select LP2950CZ-3.0/NOPB, LP2950ACZ-3.0/NOPB, LP2950ACZ-3.0G, LP2950ACZ-3.0RAG, LP2950CZ-3.0G, or LP2950CZ-3.0RAG. All maintain active product status and ROHS3 compliance. The onsemi variants (LP2950ACZ-3.0G, LP2950ACZ-3.0RAG, LP2950CZ-3.0G, LP2950CZ-3.0RAG) offer improved dropout voltage performance at 0.45V compared to the original 0.6V specification, providing enhanced efficiency in low-input-voltage applications.

For Surface-Mount Designs or Enhanced Current Requirements: The TPS70930DBVR provides 150mA output current in SOT-23-5 surface-mount packaging. This selection requires PCB redesign for surface-mount assembly and is suitable only when the higher current capacity and additional protection features (Reverse Current, Under Voltage Lockout) align with application requirements.

Packaging Considerations: LP2950ACZ-3.0RAG and LP2950CZ-3.0RAG are supplied in Cut Tape (CT) format with formed leads, while other through-hole variants are available in Bulk or standard tape formats. Verify packaging format compatibility with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can LP2950ACZ-3.0G replace LP2950-30LP in existing through-hole designs? A: Yes. Both parts maintain identical electrical specifications (3V output, 100mA current, 30V maximum input, -40°C to 125°C operating range) and through-hole TO-92-3 packaging. The onsemi variant offers superior dropout voltage performance (0.45V vs 0.6V), making it a direct functional replacement.

Q: What is the difference between LP2950CZ-3.0/NOPB and LP2950ACZ-3.0/NOPB? A: Both parts are electrically identical with 3V output and 100mA current. The primary difference is manufacturer designation (National Semiconductor vs Texas Instruments) and product status (LP2950CZ-3.0/NOPB is Active). Both are suitable for direct substitution in through-hole applications.

Q: Is TPS70930DBVR a direct replacement for LP2950-30LP? A: No. While TPS70930DBVR maintains the same 3V output and 30V maximum input voltage, it differs in three critical aspects: output current is increased to 150mA, mounting type is surface-mount SOT-23-5 (not through-hole TO-92-3), and dropout voltage is 1.4V at 150mA. This part is suitable only for new designs requiring surface-mount assembly and higher current capability.

Q: Why do onsemi variants show lower dropout voltage (0.45V vs 0.6V)? A: The onsemi LP2950 variants (LP2950ACZ-3.0G, LP2950ACZ-3.0RAG, LP2950CZ-3.0G, LP2950CZ-3.0RAG) represent improved silicon revisions with enhanced performance characteristics. The reduced dropout voltage provides better efficiency and lower heat dissipation in applications with limited input-to-output voltage margin.

Q: What packaging formats are available for LP2950 through-hole variants? A: LP2950 through-hole variants are supplied in three formats: Bulk (standard reel), Cut Tape (CT) with unformed leads, and Cut Tape (CT) with formed leads (RAG suffix). Verify packaging format compatibility with your assembly equipment before procurement.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed (LP2950CZ-3.0/NOPB, LP2950ACZ-3.0/NOPB, LP2950ACZ-3.0G, LP2950ACZ-3.0RAG, LP2950CZ-3.0G, LP2950CZ-3.0RAG, TPS70930DBVR) are ROHS3 compliant. The original LP2950-30LP is also ROHS3 compliant but carries Last Time Buy status.

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