LM79L05ACZ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM79L05ACZ is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative 5V output at 100mA. This is a negative fixed output regulator in TO-92-3 package configuration. The main part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Output Configuration	Negative
Output Type	Fixed
Output Voltage	-5V
Current - Output	100mA
Voltage - Input (Max)	-30V
Package / Case	TO-92-3 (TO-226-3)
Mounting Type	Through Hole
Operating Temperature	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LM79L05ACZ is determined by strict alignment of the following electrical and mechanical parameters:

Output voltage: -5V fixed
Output current capability: 100mA
Package type: TO-92-3 (TO-226-3)
Mounting: Through Hole
Protection features: Over Temperature and Short Circuit protection
Output configuration: Negative

Substitute parts are grouped into three categories based on substitution relationship type:

Direct Manufacturer Substitutes maintain identical electrical specifications and package configuration, with active or last-time-buy product status.

Similar Manufacturer Substitutes provide equivalent functionality with minor specification variations (such as input voltage range or quiescent current differences) while maintaining the same package and output characteristics.

Parametric Equivalents offer functionally equivalent performance from alternative manufacturers with matching core electrical parameters and package specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Input (Max)	Voltage - Output	Current - Output	Package	Operating Temp	PSRR (120Hz)
LM79L05ACZ	onsemi	Obsolete	-30V	-5V	100mA	TO-92-3	0°C ~ 125°C	60dB
MC79L05ACPG	onsemi	Active	-30V	-5V	100mA	TO-92 (Long Body)	0°C ~ 125°C	49dB
MC79L05ACLP	Texas Instruments	Last Time Buy	-20V	-5V	100mA	TO-92-3	0°C ~ 125°C	49dB
MC79L05ACLPE3	Texas Instruments	Last Time Buy	-20V	-5V	100mA	TO-92-3	0°C ~ 125°C	49dB
LM79L05ACZ/NOPB	Texas Instruments	Active	-35V	-5V	100mA	TO-92-3	0°C ~ 70°C	50dB
MC79L05ACLPR	Texas Instruments	Last Time Buy	-20V	-5V	100mA	TO-92-3	0°C ~ 125°C	49dB
L79L05ACZ	STMicroelectronics	Active	-30V	-5V	100mA	TO-92-3	0°C ~ 125°C	49dB

Engineering Selection Recommendations

For Active Product Status Requirements: L79L05ACZ (STMicroelectronics) and LM79L05ACZ/NOPB (Texas Instruments) are the only active products in this substitution group. L79L05ACZ maintains the full -30V input voltage range and 0°C to 125°C operating temperature of the original LM79L05ACZ. LM79L05ACZ/NOPB offers extended input voltage range (-35V) but operates only to 70°C.

For Last Time Buy Scenarios: MC79L05ACLP, MC79L05ACLPE3, and MC79L05ACLPR (all Texas Instruments) are available as last-time-buy options. These parts maintain full 0°C to 125°C operating temperature but are limited to -20V maximum input voltage.

For Continued Production Support: MC79L05ACPG (onsemi) is active and maintains the -30V input voltage specification. The TO-92 long body package variant may require PCB layout verification for mechanical fit.

Compliance Considerations: All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original part.

Frequently Asked Questions (FAQ)

Q: Can MC79L05ACLP replace LM79L05ACZ directly? A: MC79L05ACLP is electrically compatible for -5V 100mA output in TO-92-3 package. The input voltage specification is reduced to -20V maximum versus -30V for the original. Verify your circuit's maximum input voltage does not exceed -20V before substitution.

Q: What is the difference between MC79L05ACLP and MC79L05ACLPE3? A: Both parts are Texas Instruments products with identical electrical specifications (-20V input max, -5V output, 100mA). The suffix difference indicates packaging or tape configuration variants. Both are last-time-buy status.

Q: Is L79L05ACZ a suitable replacement for the obsolete LM79L05ACZ? A: Yes. L79L05ACZ (STMicroelectronics) maintains the same -30V input voltage range, -5V output, 100mA current, TO-92-3 package, and 0°C to 125°C operating temperature. It is currently active in production.

Q: Why does LM79L05ACZ/NOPB have a different operating temperature range? A: LM79L05ACZ/NOPB is rated 0°C to 70°C versus the original 0°C to 125°C. This is a design variant from Texas Instruments. Use this part only if your application operates within the 0°C to 70°C range.

Q: Are all substitute parts in the same TO-92-3 package? A: MC79L05ACPG uses TO-92 long body configuration. All other substitutes use standard TO-92-3 (TO-226-3) package. Verify PCB footprint compatibility before selection.

Q: What does "Last Time Buy" product status mean? A: Last Time Buy indicates the manufacturer will no longer produce the part after a specified date. Existing inventory may be available, but long-term availability is not guaranteed. For new designs, select active status parts such as L79L05ACZ or LM79L05ACZ/NOPB.

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