LM78L12ACZ Equivalent & Substitute Parts

Part Overview

The LM78L12ACZ is a linear voltage regulator IC from Texas Instruments that provides a fixed positive 12V output at 100mA. It is packaged in TO-92-3 (TO-226-3) through-hole configuration and includes integrated protection features for over-temperature and short-circuit conditions. The main part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts maintain the same electrical output specifications and mechanical compatibility while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	100mA
Input Voltage (Max)	35V
Quiescent Current	3-6.5 mA
Package Type	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
Operating Temperature Range	0°C to 125°C (standard); -40°C to 125°C (extended)
Protection Features	Over Temperature, Short Circuit
Output Configuration	Positive Fixed

Substitute Part Grouping Explanation

Substitution for the LM78L12ACZ is determined by strict equivalence in the following parameters:

Fixed output voltage of 12V
Output current capability of 100mA minimum
TO-92-3 (TO-226-3) through-hole package
Positive output configuration
Operating temperature range compatibility (0°C to 125°C minimum)
Input voltage rating of 27V or higher

Substitute parts are grouped by manufacturer and product status. Texas Instruments variants (LM78L12ACZ/NOPB, LM78L12ACZ/LFT7, UA78L12ACLPE3, UA78L12ACLPM) maintain identical electrical specifications. STMicroelectronics parts (L78L12ABZ, L78L12ACZ, L78L12ACZ-TR) and onsemi parts (MC78L12ABPG, MC78L12ACPG, MC78L12ACPRAG) provide functional equivalence with active product status and improved compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	Package	Operating Temp	Product Status	RoHS Status
LM78L12ACZ	Texas Instruments	12V	100mA	35V	3 mA	TO-92-3	0°C ~ 125°C	Obsolete	Non-compliant
LM78L12ACZ/NOPB	Texas Instruments	12V	100mA	35V	3 mA	TO-92-3	0°C ~ 125°C	Active	ROHS3 Compliant
LM78L12ACZ/LFT7	Texas Instruments	12V	100mA	35V	3 mA	TO-92-3	0°C ~ 125°C	Active	ROHS3 Compliant
UA78L12ACLPE3	Texas Instruments	12V	100mA	27V	Not specified	TO-92-3	0°C ~ 125°C	Obsolete	ROHS3 Compliant
UA78L12ACLPM	Texas Instruments	12V	100mA	27V	Not specified	TO-92-3	0°C ~ 125°C	Obsolete	ROHS3 Compliant
L78L12ABZ	STMicroelectronics	12V	100mA	35V	6 mA	TO-92-3	-40°C ~ 125°C	Active	ROHS3 Compliant
L78L12ACZ	STMicroelectronics	12V	100mA	35V	6 mA	TO-92-3	0°C ~ 125°C	Active	ROHS3 Compliant
L78L12ACZ-TR	STMicroelectronics	12V	100mA	35V	6 mA	TO-92-3	0°C ~ 125°C	Active	ROHS3 Compliant
MC78L12ABPG	onsemi	12V	100mA	35V	6.5 mA	TO-92-3	-40°C ~ 125°C	Active	ROHS3 Compliant
MC78L12ACPG	onsemi	12V	100mA	35V	6.5 mA	TO-92-3	0°C ~ 125°C	Active	ROHS3 Compliant
MC78L12ACPRAG	onsemi	12V	100mA	35V	6.5 mA	TO-92-3	0°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production applications, LM78L12ACZ/NOPB or LM78L12ACZ/LFT7 from Texas Instruments are preferred substitutes. Both maintain identical electrical specifications to the original part while offering active product status and ROHS3 compliance. The /LFT7 variant is supplied in cut tape packaging, suitable for automated assembly processes.

For applications requiring extended temperature operation (-40°C to 125°C), L78L12ABZ from STMicroelectronics or MC78L12ABPG from onsemi provide equivalent functionality with broader temperature range coverage. Both are actively produced and ROHS3 compliant.

For standard temperature range applications (0°C to 125°C), L78L12ACZ from STMicroelectronics and MC78L12ACPG from onsemi are suitable alternatives. The MC78L12ACPRAG variant offers cut tape packaging for automated assembly.

All recommended substitutes are ROHS3 compliant and actively produced, ensuring long-term availability and supply chain stability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM78L12ACZ with LM78L12ACZ/NOPB?

A: Yes. Both parts are electrically and mechanically identical, with identical output voltage (12V), output current (100mA), input voltage rating (35V), and TO-92-3 package. The primary difference is product status: LM78L12ACZ/NOPB is active and ROHS3 compliant, while the original is obsolete.

Q: What is the difference between LM78L12ACZ/LFT7 and LM78L12ACZ/NOPB?

A: Both parts have identical electrical specifications. The difference is packaging format: /LFT7 is supplied in cut tape (CT) for automated pick-and-place assembly, while /NOPB is supplied in bulk. Select based on assembly process requirements.

Q: Can I use STMicroelectronics L78L12ACZ instead of Texas Instruments LM78L12ACZ?

A: Yes. Both parts deliver 12V at 100mA in TO-92-3 package with identical input voltage rating (35V) and operating temperature range (0°C to 125°C). The STMicroelectronics part has slightly higher quiescent current (6 mA vs. 3 mA) but remains functionally equivalent. L78L12ACZ is actively produced and ROHS3 compliant.

Q: What is the difference between MC78L12ACPG and MC78L12ABPG?

A: Both are onsemi parts with identical electrical output specifications (12V, 100mA). The primary difference is operating temperature range: MC78L12ACPG operates 0°C to 125°C, while MC78L12ABPG operates -40°C to 125°C. Select based on application temperature requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended active substitute parts (LM78L12ACZ/NOPB, LM78L12ACZ/LFT7, L78L12ABZ, L78L12ACZ, L78L12ACZ-TR, MC78L12ABPG, MC78L12ACPG, MC78L12ACPRAG) are ROHS3 compliant. The original LM78L12ACZ is RoHS non-compliant.

Q: Can I use UA78L12ACLPE3 or UA78L12ACLPM as substitutes?

A: These parts are functionally equivalent but are classified as obsolete. While they maintain 12V output at 100mA in TO-92-3 package, they have lower maximum input voltage (27V vs. 35V) and are no longer actively produced. Active alternatives are preferred for new applications.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in bulk and cut tape (CT) packaging. Bulk packaging (LM78L12ACZ/NOPB, L78L12ACZ, MC78L12ACPG) is suitable for manual assembly and repair. Cut tape variants (LM78L12ACZ/LFT7, L78L12ACZ-TR, MC78L12ACPRAG) are designed for automated assembly processes.

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