LM78L05ACZ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM78L05ACZ is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 100mA. This TO-92-3 package device is classified as obsolete, though 93,200 units remain in stock. The device delivers regulated power with integrated over-temperature and short-circuit protection across an operating range of -40°C to 125°C.

Due to the obsolete product status of the LM78L05ACZ, identifying active equivalent and substitute parts is essential for ongoing design support, production continuity, and long-term component availability. Active alternatives from the same manufacturer provide identical electrical performance with improved supply chain accessibility.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	30V
Quiescent Current (Iq)	5.5mA
PSRR @ 120Hz	80dB
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Package Type	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the LM78L05ACZ is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Criteria:

Fixed output voltage of 5V
Output current rating of 100mA
Maximum input voltage of 30V
Over-temperature and short-circuit protection
TO-92-3 package configuration (through-hole mounting)
RoHS3 compliance and REACH unaffected status

All substitute parts listed maintain identical output specifications, protection features, and package geometry. Variations in quiescent current (5.5mA vs. 6mA) and PSRR performance (80dB vs. 49dB) represent minor differences within the same product family and do not affect functional substitutability for standard 5V regulation applications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Iq (mA)	PSRR @ 120Hz	Temp Range	Package	Status	Inventory
LM78L05ACZ	onsemi	5V	100mA	30V	5.5	80dB	-40 to 125°C	TO-92-3	Obsolete	93,200
MC78L05ABPG	onsemi	5V	100mA	30V	6	49dB	-40 to 125°C	TO-92-3	Active	2,140
MC78L05ABPRAG	onsemi	5V	100mA	30V	6	49dB	-40 to 125°C	TO-92-3	Active	1,320
MC78L05ABPREG	onsemi	5V	100mA	30V	6	49dB	-40 to 125°C	TO-92-3	Active	21,400
MC78L05ABPRMG	onsemi	5V	100mA	30V	6	49dB	-40 to 125°C	TO-92-3	Active	1,995
MC78L05ACPG	onsemi	5V	100mA	30V	6	49dB	0 to 125°C	TO-92-3	Active	9,900
MC78L05ACPRAG	onsemi	5V	100mA	30V	6	49dB	0 to 125°C	TO-92-3	Active	5,100
MC78L05ACPREG	onsemi	5V	100mA	30V	6	49dB	0 to 125°C	TO-92-3	Active	1,270
MC78L05ACPRMG	onsemi	5V	100mA	30V	6	49dB	0 to 125°C	TO-92-3	Active	9,936
MC78L05ACPRPG	onsemi	5V	100mA	30V	6	49dB	0 to 125°C	TO-92-3	Active	5,400
NCV78L05ABPG	onsemi	5V	100mA	30V	6	49dB	-40 to 125°C	TO-92-3	Active	718

Engineering Selection Recommendations

For Standard Industrial Applications (-40°C to 125°C): Select MC78L05ABPREG, MC78L05ABPRMG, or MC78L05ABPRAG. These parts maintain the full temperature range of the original LM78L05ACZ while offering active product status and superior inventory availability. MC78L05ABPREG provides the highest stock level at 21,400 units.

For Automotive-Grade Applications: The NCV78L05ABPG variant is qualified to AEC-Q100 automotive standards and maintains the -40°C to 125°C operating range. This part is suitable for automotive and harsh-environment applications requiring formal qualification documentation.

For Restricted Temperature Range (0°C to 125°C): The MC78L05ACPRMG, MC78L05ACPREG, MC78L05ACPRAG, MC78L05ACPRPG, and MC78L05ACPG variants are suitable when the lower operating temperature limit can be relaxed to 0°C. These parts offer active status and good inventory levels.

All substitute parts carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original LM78L05ACZ.

Frequently Asked Questions (FAQ)

Q: Can MC78L05ABPREG directly replace LM78L05ACZ in existing designs? A: Yes. Both parts deliver 5V at 100mA with identical TO-92-3 package geometry, maximum input voltage of 30V, and protection features. The MC78L05ABPREG maintains the full -40°C to 125°C operating range. Pin-for-pin compatibility is assured.

Q: What is the difference between MC78L05AB and MC78L05AC variants? A: The primary difference is operating temperature range. MC78L05AB variants operate from -40°C to 125°C, matching the original LM78L05ACZ. MC78L05AC variants operate from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Why do some part numbers include ABPG, ABPRAG, or ABPREG suffixes? A: These suffixes denote packaging and lead configuration. ABPG indicates bulk packaging, ABPRAG indicates cut tape with formed leads, and ABPREG indicates cut tape with standard leads. All deliver identical electrical performance in the TO-92-3 package.

Q: Is NCV78L05ABPG suitable for non-automotive applications? A: Yes. The NCV78L05ABPG is automotive-qualified but functions identically to industrial-grade variants in standard applications. It provides additional qualification documentation if needed for supply chain traceability.

Q: What inventory considerations should guide part selection? A: MC78L05ABPREG offers the highest active inventory at 21,400 units, followed by MC78L05ACPRMG at 9,936 units and MC78L05ACPG at 9,900 units. For long-term production, these options provide superior supply security compared to the obsolete LM78L05ACZ.

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