LP2950ACN-L-5-0/TR Linear Voltage Regulator 5V 100mA Equivalent & Substitute Parts

Part Overview

The LP2950ACN-L-5-0/TR is a linear voltage regulator IC manufactured by MaxLinear, Inc., designed to provide a fixed positive 5V output at 100mA. This through-hole TO-92-3 package device operates across an input voltage range up to 30V with a maximum dropout voltage of 0.45V at 100mA. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution for the LP2950ACN-L-5-0/TR is determined by the following critical parameters:

Fixed output voltage of 5V
Output current capability of 100mA minimum
Input voltage tolerance up to 30V
TO-92-3 through-hole package compatibility
Operating temperature range of -40°C to 125°C
Positive output configuration with fixed regulation

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in quiescent current, dropout voltage, and protection feature sets do not prevent functional substitution when these primary parameters align.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage @ 100mA	Iq (µA)	Temp Range	Product Status
LP2950ACN-L-5-0/TR	MaxLinear, Inc.	5V	100mA	30V	0.45V	170	-40°C ~ 125°C	Obsolete
LP2950-50LPRE3	Texas Instruments	5V	100mA	30V	0.6V	120	-40°C ~ 125°C	Active
L78L05ABZ-AP	STMicroelectronics	5V	100mA	30V	—	5.5	-40°C ~ 125°C	Active
L78L05ABZ-TR	STMicroelectronics	5V	100mA	30V	—	5.5	-40°C ~ 125°C	Active
L78L05ACZ-AP	STMicroelectronics	5V	100mA	30V	—	5.5	0°C ~ 125°C	Active
L78L05ACZTR	STMicroelectronics	5V	100mA	30V	—	5.5	0°C ~ 125°C	Active
LP2950ACZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V	120	-40°C ~ 125°C	Active
LP2950ACZ-5.0RAG	onsemi	5V	100mA	30V	0.45V	120	-40°C ~ 125°C	Active
LP2950CZ-5.0/LFT1	Texas Instruments	5V	100mA	30V	0.6V	120	-40°C ~ 125°C	Active
LP2950CZ-5.0/LFT3	Texas Instruments	5V	100mA	30V	0.6V	120	-40°C ~ 125°C	Active
LP2950CZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V	120	-40°C ~ 125°C	Active

Engineering Selection Recommendations

All listed substitute parts are active production components with RoHS3 compliance and REACH unaffected status, providing long-term supply assurance compared to the obsolete LP2950ACN-L-5-0/TR.

The LP2950ACZ-5.0RAG (onsemi) offers the closest electrical match, maintaining the original 0.45V dropout voltage specification while providing active product status. This part is recommended as the primary direct replacement.

The L78L05 series from STMicroelectronics (L78L05ABZ-AP, L78L05ABZ-TR, L78L05ACZ-AP, L78L05ACZTR) provides functional equivalence with significantly lower quiescent current (5.5 µA versus 170 µA), beneficial for low-power applications. The ABZ variants support the full -40°C to 125°C temperature range, while ACZ variants operate from 0°C to 125°C.

Texas Instruments LP2950 variants (LP2950-50LPRE3, LP2950ACZ-5.0/LFT7, LP2950CZ-5.0/LFT1, LP2950CZ-5.0/LFT3, LP2950CZ-5.0/LFT7) maintain the LP2950 base product lineage with active status and full temperature range support.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LP2950ACN-L-5-0/TR with any of these substitute parts?

A: Yes. All listed parts maintain the critical specifications: 5V fixed output, 100mA output current, 30V maximum input voltage, TO-92-3 package, and -40°C to 125°C operating range (except L78L05ACZ variants which operate 0°C to 125°C). Electrical and mechanical compatibility is confirmed.

Q: What is the difference between LP2950 and L78L05 series regulators?

A: Both are 5V 100mA linear regulators in TO-92-3 packages. The L78L05 series exhibits lower quiescent current (5.5 µA) compared to LP2950 variants (120-170 µA), making it preferable for battery-powered or low-power standby applications. The LP2950 series maintains closer dropout voltage specifications in some variants.

Q: Does operating temperature range affect substitution?

A: The L78L05ACZ-AP and L78L05ACZTR variants operate from 0°C to 125°C, which is narrower than the original -40°C to 125°C range. These parts are suitable only if your application does not require operation below 0°C. All other substitutes support the full -40°C to 125°C range.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance certification, meeting current environmental and regulatory requirements.

Q: What packaging options are available?

A: All substitute parts use TO-92-3 through-hole package with formed leads, maintaining mechanical compatibility with the original LP2950ACN-L-5-0/TR footprint and assembly process.

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