LP2950CZ-3.0 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LP2950CZ-3.0 is a micropower linear voltage regulator IC from onsemi, delivering a fixed 3V output at 100mA in a TO-92-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part provides positive fixed output regulation with integrated over-current and over-temperature protection, suitable for low-power applications requiring stable 3V rails.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the LP2950CZ-3.0 is determined by the following critical parameters: fixed 3V output voltage, 100mA output current capability, 30V maximum input voltage, TO-92-3 package compatibility, through-hole mounting, and -40°C to 125°C operating temperature range. All substitute parts must maintain these electrical and mechanical specifications to ensure direct functional replacement without circuit redesign.

The substitute parts are grouped into three categories:

Direct Manufacturer Equivalent: LP2950CZ-3.0G (onsemi) — identical electrical specifications with updated RoHS3 compliance and active product status.

Parametric Equivalents: LP2950ACZ-3.0G (onsemi) — matches all critical electrical parameters with active status and improved compliance.

Similar Cross-Manufacturer Parts: LP2950-30LP, LP2950-30LPR (Texas Instruments), and LP2950ACZ-3.0/NOPB (Texas Instruments) — functionally equivalent with minor voltage dropout variations (0.6V vs. 0.45V) and identical output specifications. LP2950CZ-3.0/NOPB (National Semiconductor) — active equivalent with matching electrical performance.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 100mA	Quiescent Current	Package	Product Status	RoHS Status
LP2950CZ-3.0	onsemi	3V	100mA	30V	0.45V	120 µA	TO-92-3	Obsolete	Non-compliant
LP2950CZ-3.0G	onsemi	3V	100mA	30V	0.45V	120 µA	TO-92-3	Active	ROHS3 Compliant
LP2950ACZ-3.0G	onsemi	3V	100mA	30V	0.45V	120 µA	TO-92-3	Active	ROHS3 Compliant
LP2950-30LP	Texas Instruments	3V	100mA	30V	0.6V	120 µA	TO-92-3	Last Time Buy	ROHS3 Compliant
LP2950-30LPR	Texas Instruments	3V	100mA	30V	0.6V	120 µA	TO-92-3	Last Time Buy	ROHS3 Compliant
LP2950ACZ-3.0/NOPB	Texas Instruments	3V	100mA	30V	0.6V	120 µA	TO-92-3	Active	ROHS3 Compliant
LP2950CZ-3.0/NOPB	National Semiconductor	3V	100mA	30V	0.6V	120 µA	TO-92-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production continuity, LP2950CZ-3.0G or LP2950ACZ-3.0G from onsemi are the primary recommendations. Both parts maintain identical electrical specifications to the original LP2950CZ-3.0 while offering active product status and ROHS3 compliance, eliminating obsolescence risk.

Texas Instruments LP2950-30LP and LP2950-30LPR are viable alternatives with equivalent functionality. These parts carry Last Time Buy status, indicating limited future availability. The 0.15V increase in maximum dropout voltage (0.6V vs. 0.45V) is acceptable in most applications but should be verified in power budget calculations for marginal input voltage conditions.

LP2950ACZ-3.0/NOPB (Texas Instruments) and LP2950CZ-3.0/NOPB (National Semiconductor) provide active product alternatives with full RoHS3 compliance. Both maintain the 0.6V dropout specification and are suitable for designs where the slightly higher dropout voltage does not impact system performance.

All substitute parts share identical TO-92-3 package geometry, mounting type, and operating temperature range, enabling direct PCB-level replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can LP2950CZ-3.0G be used as a direct replacement for LP2950CZ-3.0?

A: Yes. LP2950CZ-3.0G is the direct onsemi equivalent with identical electrical specifications (3V output, 100mA, 0.45V dropout), same TO-92-3 package, and matching operating temperature range. The primary difference is active product status and ROHS3 compliance versus the obsolete original.

Q: What is the impact of the 0.15V higher dropout voltage in Texas Instruments parts?

A: Texas Instruments LP2950-30LP, LP2950-30LPR, and LP2950ACZ-3.0/NOPB specify 0.6V maximum dropout versus 0.45V for onsemi parts. This affects minimum input voltage requirements. For example, with a 3V output and 100mA load, the minimum input voltage increases from 3.45V to 3.6V. Verify this margin against your power supply specifications before selection.

Q: Are all substitute parts in the same TO-92-3 package?

A: Yes. All listed substitute parts use TO-92-3 (TO-226-3) package with identical pin configuration and through-hole mounting, enabling direct PCB replacement without layout changes.

Q: Which substitute part has the best long-term availability?

A: LP2950CZ-3.0G and LP2950ACZ-3.0G (onsemi) and LP2950ACZ-3.0/NOPB (Texas Instruments) carry active product status, indicating ongoing production and availability. LP2950-30LP and LP2950-30LPR are Last Time Buy, with limited future supply.

Q: Do all substitute parts include over-current and over-temperature protection?

A: Yes. All listed parts include over-current and over-temperature protection. LP2950-30LPR additionally specifies short-circuit protection.

Q: What is the difference between bulk and cut tape packaging options?

A: LP2950-30LPR is supplied in cut tape (CT) format for automated assembly, while other parts are available in bulk packaging. Both formats contain identical die and electrical specifications; packaging choice depends on assembly process requirements.

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