LM78L05ACZX Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM78L05ACZX is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 100mA. This device features integrated over-temperature and short-circuit protection, operating across an input voltage range up to 30V with a through-hole TO-92-3 package configuration. The part is currently classified as 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
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-226AA)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the LM78L05ACZX is determined by strict equivalence across the following electrical and mechanical parameters:

Fixed output voltage of 5V
Output current capability of 100mA
Maximum input voltage of 30V
Over-temperature and short-circuit protection
TO-92-3 package configuration with through-hole mounting
Operating temperature range compatibility

All substitute parts listed maintain these core specifications. Variations in quiescent current (Iq) and PSRR performance are noted but do not prevent functional substitution when these parameters remain within acceptable design margins. Product status and compliance certifications are provided to support procurement decisions.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Iq (mA)	PSRR @ 120Hz	Operating Temp	Package	Product Status
LM78L05ACZX	onsemi	5V	100mA	30V	5.5	80dB	-40°C to 125°C	TO-92-3	Obsolete
MC78L05ABPG	onsemi	5V	100mA	30V	6	49dB	-40°C to 125°C	TO-92-3	Active
MC78L05ABPRAG	onsemi	5V	100mA	30V	6	49dB	-40°C to 125°C	TO-92-3	Active
MC78L05ABPREG	onsemi	5V	100mA	30V	6	49dB	-40°C to 125°C	TO-92-3	Active
MC78L05ABPRMG	onsemi	5V	100mA	30V	6	49dB	-40°C to 125°C	TO-92-3	Active
MC78L05ABPRPG	onsemi	5V	100mA	30V	6	49dB	-40°C to 125°C	TO-92-3	Active
MC78L05ACPG	onsemi	5V	100mA	30V	6	49dB	0°C to 125°C	TO-92-3	Active
MC78L05ACPRAG	onsemi	5V	100mA	30V	6	49dB	0°C to 125°C	TO-92-3	Active
MC78L05ACPREG	onsemi	5V	100mA	30V	6	49dB	0°C to 125°C	TO-92-3	Active
MC78L05ACPRMG	onsemi	5V	100mA	30V	6	49dB	0°C to 125°C	TO-92-3	Active
MC78L05ACPRPG	onsemi	5V	100mA	30V	6	49dB	0°C to 125°C	TO-92-3	Active

Engineering Selection Recommendations

All listed substitute parts are manufactured by onsemi and maintain electrical and mechanical compatibility with the LM78L05ACZX. Selection should prioritize active product status for long-term availability and supply chain stability.

For applications requiring the full -40°C to 125°C operating temperature range, select from the MC78L05ABxx series (ABPG, ABPRAG, ABPREG, ABPRMG, ABPRPG).

For applications with operating temperature requirements of 0°C to 125°C, the MC78L05ACxx series (ACPG, ACPRAG, ACPREG, ACPRMG, ACPRPG) provides equivalent functionality.

The MC78L05ABPRPG variant includes AEC-Q100 automotive qualification and is suitable for automotive-grade applications.

All substitute parts carry ROHS3 compliance and REACH unaffected status, supporting environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MC78L05 series parts directly replace the LM78L05ACZX?

A: Yes. Both series maintain identical output voltage (5V), output current (100mA), input voltage rating (30V), and TO-92-3 package configuration. The MC78L05 variants are active products with established supply availability.

Q: What is the difference between MC78L05ABxx and MC78L05ACxx variants?

A: The primary difference is operating temperature range. MC78L05ABxx operates from -40°C to 125°C, matching the original LM78L05ACZX specification. MC78L05ACxx operates from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Are there packaging differences between substitute parts?

A: All substitute parts use TO-92-3 through-hole packaging. Packaging options vary by part number suffix (Bulk, Cut Tape, or unspecified), which affects procurement and handling but not electrical or mechanical compatibility.

Q: Does the lower PSRR of MC78L05 parts affect substitution?

A: The MC78L05 series has 49dB PSRR at 120Hz compared to 80dB for the LM78L05ACZX. Both values provide adequate power supply rejection for typical linear regulator applications. Verify PSRR performance against your specific noise rejection requirements before selection.

Q: Which substitute part has the highest inventory availability?

A: MC78L05ABPREG and MC78L05ACPRMG offer the highest inventory levels at 21,400 and 9,936 units respectively, supporting immediate procurement needs.

Q: Is the MC78L05ABPRPG suitable for automotive applications?

A: Yes. The MC78L05ABPRPG carries AEC-Q100 automotive qualification and is rated for -40°C to 125°C operation, making it suitable for automotive-grade designs requiring the full temperature range.

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