LM78L05ACZ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM78L05ACZ is a linear voltage regulator IC manufactured by Texas Instruments, classified as a positive fixed output power management component. This device delivers a fixed 5V output at 100mA maximum current in a TO-92-3 through-hole package. The main part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Active alternatives from multiple manufacturers provide functional equivalence while offering improved compliance and availability.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Maximum)	35V
Output Configuration	Positive
Number of Regulators	1
Package Type	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
Operating Temperature Range	0°C to 125°C
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility for the LM78L05ACZ is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Fixed output voltage of 5V
Output current capability of 100mA minimum
Positive output configuration
Single regulator topology
TO-92-3 package compatibility
Through-hole mounting

Acceptable Variation Parameters:

Input voltage maximum: 30V to 35V acceptable
Quiescent current: 3mA to 6mA acceptable
PSRR: 49dB to 62dB acceptable
Operating temperature: -40°C to 125°C or 0°C to 125°C acceptable
Protection features: Over Temperature and Short Circuit minimum; Over Current acceptable as additional feature

All substitute parts listed maintain identical output specifications and package form factor, ensuring direct functional replacement in existing circuit designs.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	PSRR (120Hz)	Operating Temp	Product Status	RoHS Status	Inventory
LM78L05ACZ	Texas Instruments	5V	100mA	35V	3mA	62dB	0°C ~ 125°C	Obsolete	Non-compliant	93,200 Pcs
LM78L05ACZ/NOPB	Texas Instruments	5V	100mA	35V	3mA	62dB	0°C ~ 125°C	Active	ROHS3 Compliant	5,440 Pcs
L78L05ABZ	STMicroelectronics	5V	100mA	30V	5.5mA	49dB	-40°C ~ 125°C	Active	ROHS3 Compliant	55,100 Pcs
L78L05ACZ	STMicroelectronics	5V	100mA	30V	5.5mA	49dB	0°C ~ 125°C	Active	ROHS3 Compliant	297,853 Pcs
L78L05ACZTR	STMicroelectronics	5V	100mA	30V	5.5mA	49dB	0°C ~ 125°C	Active	ROHS3 Compliant	98,605 Pcs
MC78L05ABPG	onsemi	5V	100mA	30V	6mA	49dB	-40°C ~ 125°C	Active	ROHS3 Compliant	2,140 Pcs
MC78L05ABPRAG	onsemi	5V	100mA	30V	6mA	49dB	-40°C ~ 125°C	Active	ROHS3 Compliant	1,320 Pcs
MC78L05ABPREG	onsemi	5V	100mA	30V	6mA	49dB	-40°C ~ 125°C	Active	ROHS3 Compliant	21,400 Pcs
MC78L05ABPRMG	onsemi	5V	100mA	30V	6mA	49dB	-40°C ~ 125°C	Active	ROHS3 Compliant	1,995 Pcs
MC78L05ACPG	onsemi	5V	100mA	30V	6mA	49dB	0°C ~ 125°C	Active	ROHS3 Compliant	9,900 Pcs
MC78L05ACPRAG	onsemi	5V	100mA	30V	6mA	49dB	0°C ~ 125°C	Active	ROHS3 Compliant	5,100 Pcs

Engineering Selection Recommendations

Primary Recommendation: L78L05ACZ (STMicroelectronics)

The L78L05ACZ from STMicroelectronics is the preferred substitute. It maintains identical electrical specifications for output voltage and current, operates within the required temperature range (0°C to 125°C), and carries ROHS3 compliance certification. Inventory availability of 297,853 units ensures supply continuity. This part is functionally equivalent to the obsolete LM78L05ACZ with improved regulatory compliance.

Alternative: LM78L05ACZ/NOPB (Texas Instruments)

For applications requiring continuity with the original Texas Instruments manufacturer, the LM78L05ACZ/NOPB provides an active alternative. This variant maintains the original electrical characteristics and ROHS3 compliance, though inventory is more limited at 5,440 units.

Extended Temperature Range Option: L78L05ABZ (STMicroelectronics)

Applications requiring operation at temperatures below 0°C should specify L78L05ABZ, which operates from -40°C to 125°C. This part maintains all other electrical specifications and ROHS3 compliance with substantial inventory availability.

onsemi Alternatives: MC78L05 Series

The MC78L05 series from onsemi (MC78L05ABPG, MC78L05ABPRAG, MC78L05ABPREG, MC78L05ABPRMG, MC78L05ACPG, MC78L05ACPRAG) provides functionally equivalent substitutes with ROHS3 compliance. These parts differ in packaging format (bulk or cut tape) and temperature rating. The MC78L05ABPG and MC78L05ABPRAG variants support extended temperature operation (-40°C to 125°C), while MC78L05ACPG and MC78L05ACPRAG operate at 0°C to 125°C. All maintain 100mA output current and 5V fixed output specifications.

Selection Criteria by Application:

Standard industrial applications (0°C to 125°C): L78L05ACZ or MC78L05ACPG
Extended temperature requirements (-40°C to 125°C): L78L05ABZ or MC78L05ABPG
High-volume procurement: L78L05ACZ (297,853 units available)
Packaging preference (cut tape): L78L05ACZTR or MC78L05ABPRAG

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM78L05ACZ with L78L05ACZ?

A: Yes. Both parts deliver 5V fixed output at 100mA in TO-92-3 packages. The L78L05ACZ from STMicroelectronics is electrically equivalent and maintains the same pinout and mounting configuration. The primary difference is manufacturer and compliance status (L78L05ACZ is ROHS3 compliant).

Q: What is the difference between MC78L05ABPG and MC78L05ACPG?

A: Both are onsemi products with identical electrical specifications. The difference is operating temperature range: MC78L05ABPG operates from -40°C to 125°C, while MC78L05ACPG operates from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Are the packaging variants (bulk vs. cut tape) electrically identical?

A: Yes. Packaging format (bulk or cut tape) does not affect electrical performance. L78L05ACZ and L78L05ACZTR are the same part; the suffix "TR" indicates cut tape packaging. Select based on your procurement and assembly process requirements.

Q: Can I use a part with higher input voltage rating as a substitute?

A: The LM78L05ACZ accepts input voltages up to 35V. Substitute parts rated for 30V maximum input are acceptable if your circuit design does not exceed 30V input. If your application requires 30V to 35V input operation, specify LM78L05ACZ/NOPB or verify the substitute part's actual maximum input rating.

Q: What does ROHS3 compliance mean for this component?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All active substitute parts listed carry ROHS3 certification. The original LM78L05ACZ is non-compliant, making compliant substitutes necessary for regulated applications.

Q: Are all listed parts pin-compatible?

A: Yes. All substitute parts use the TO-92-3 package with identical pinout: pin 1 (input), pin 2 (ground), pin 3 (output). Direct board-level replacement is possible without circuit modification.

Q: Which substitute has the best availability?

A: L78L05ACZ from STMicroelectronics has the highest inventory at 297,853 units, followed by L78L05ACZTR at 98,605 units. Both are STMicroelectronics products with identical electrical specifications.

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