LP2950CZ-5.0G Equivalent & Substitute Parts

Part Overview

The LP2950CZ-5.0G is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 5V output at 100mA in a TO-92-3 through-hole package. This micropower regulator is designed for applications requiring low quiescent current (120 µA) and operates across an extended temperature range of -40°C to 125°C. The device is currently in active production status with 1970 units in stock.

Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility across manufacturing sources is required. The parts listed below maintain electrical and mechanical compatibility within the specified parameter tolerances.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Voltage Dropout (Max)	0.45V @ 100mA
Quiescent Current	120 µA
Operating Temperature	-40°C to 125°C
Package Type	TO-92-3 (TO-226)
Mounting Type	Through Hole
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Output voltage: 5V fixed
Output current capability: 100mA minimum
Package type: TO-92-3 through-hole configuration
Input voltage rating: minimum 26V (LM2931AZ50R) to 30V
Operating temperature range: -40°C to 125°C minimum
Protection features: Over current and over temperature protection required

Parametric Equivalent: Parts with identical electrical specifications and the same base product number (LP2950) from onsemi qualify as direct parametric equivalents.

Direct Manufacturer Equivalent: Parts from alternative manufacturers (STMicroelectronics, Texas Instruments) that meet all critical electrical parameters and package requirements qualify as direct equivalents, with noted variations in dropout voltage, quiescent current, or supply current where specified.

Similar Parts: Parts meeting core functional requirements (5V output, 100mA, TO-92-3 package) but with variations in input voltage rating, quiescent current, or protection feature sets.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Operating Temp	Package	Status
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
LM2931AZ50R	STMicroelectronics	5V	100mA	26V	0.6V @ 100mA	1 mA	-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
LP2950-50LPRE3	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
LP2950ACZ-5.0/LFT7	Texas Instruments	5V	100mA	30V	0.6V @ 100mA	120 µA	-40°C to 125°C	TO-92-3	Active
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
UA78L05ACLPM	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	Not specified	0°C to 125°C	TO-92-3	Last Time Buy
UA78L05ACLPME3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	Not specified	0°C to 125°C	TO-92-3	Last Time Buy

Engineering Selection Recommendations

Preferred Substitutes (Active Status, Full Temperature Range):

LP2950ACZ-5.0G (onsemi) and LP2950-50LPRE3, LP2950ACZ-5.0/LFT7, LP2950ACZ-5.0/NOPB, LP2950CZ-5.0/NOPB (Texas Instruments) are direct functional equivalents with active production status. These parts maintain identical output specifications, quiescent current characteristics, and full -40°C to 125°C operating range. All are ROHS3 compliant and REACH unaffected.

Alternative Substitutes (Active Status, Parameter Variations):

LM2931AZ50R (STMicroelectronics) operates at full temperature range with active status but features reduced input voltage maximum (26V versus 30V) and elevated quiescent current (1 mA versus 120 µA). This part is suitable for applications where input voltage does not exceed 26V and where higher quiescent current is acceptable.

L78L05ABZ (STMicroelectronics) maintains 30V input rating and full temperature range with active status. Quiescent current is elevated at 5.5 mA. This part is suitable for applications where quiescent current impact is not critical.

Not Recommended for New Designs:

UA78L05ACLPM and UA78L05ACLPME3 (Texas Instruments) carry Last Time Buy status and feature restricted input voltage (20V maximum) and elevated dropout voltage (1.7V @ 40mA). Operating temperature range is limited to 0°C to 125°C. These parts are unsuitable for applications requiring the full -40°C to 125°C range or input voltages above 20V.

Frequently Asked Questions (FAQ)

Q: Can LP2950ACZ-5.0G directly replace LP2950CZ-5.0G?

A: Yes. Both parts are onsemi LP2950 series regulators with identical electrical specifications: 5V fixed output, 100mA current, 30V maximum input, 0.45V dropout at 100mA, 120 µA quiescent current, and -40°C to 125°C operating range. Both use TO-92-3 through-hole packaging. The primary difference is packaging format (Bulk for both). Direct pin-for-pin substitution is valid.

Q: What are the key differences between onsemi and Texas Instruments LP2950 variants?

A: onsemi LP2950CZ-5.0G and LP2950ACZ-5.0G specify 0.45V dropout at 100mA. Texas Instruments LP2950 variants (LP2950-50LPRE3, LP2950ACZ-5.0/LFT7, LP2950ACZ-5.0/NOPB, LP2950CZ-5.0/NOPB) specify 0.6V dropout at 100mA. All maintain 120 µA quiescent current and 30V maximum input voltage. The 0.15V dropout difference is negligible for most applications. All are ROHS3 compliant and suitable for -40°C to 125°C operation.

Q: Is LM2931AZ50R a suitable substitute?

A: LM2931AZ50R (STMicroelectronics) is functionally suitable for applications where input voltage does not exceed 26V. The part maintains 5V output, 100mA current, and -40°C to 125°C operation. However, quiescent current is significantly higher at 1 mA versus 120 µA, and dropout voltage is 0.6V at 100mA. Use this part only when input voltage limitation is acceptable and higher quiescent current does not impact system performance.

Q: Why are UA78L05ACLPM and UA78L05ACLPME3 marked Last Time Buy?

A: These parts are in end-of-life status. Both feature restricted input voltage (20V maximum versus 30V) and elevated dropout voltage (1.7V @ 40mA). Operating temperature range is limited to 0°C to 125°C, excluding the -40°C lower bound. These limitations make them unsuitable for new designs or applications requiring extended temperature operation or higher input voltages.

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

A: Yes. All listed substitute parts use TO-92-3 through-hole packaging (TO-226-3 designation). Pin configuration and mechanical dimensions are compatible. Direct board-level substitution is valid without PCB redesign.

Q: What compliance certifications apply to these parts?

A: All active-status parts (LP2950 series from onsemi and Texas Instruments, LM2931AZ50R, L78L05ABZ) are ROHS3 compliant and REACH unaffected. ECCN classification is EAR99 for all parts. Last Time Buy parts (UA78L05ACLPM, UA78L05ACLPME3) maintain identical compliance status but are not recommended for new designs.

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