LM79L05ACZX Equivalent & Substitute Parts

Part Overview

The LM79L05ACZX is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative 5V output at 100mA. This through-hole component operates across an input voltage range up to -30V and includes integrated over-temperature and short-circuit protection. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Output Configuration	Negative
Output Type	Fixed
Output Voltage	-5V
Current Output	100mA
Voltage Input (Max)	-30V
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility for the LM79L05ACZX is determined by the following critical parameters:

Output configuration must be negative
Fixed output voltage must be -5V
Current output rating must be 100mA minimum
Package must be TO-92-3 (TO-226) with through-hole mounting
Input voltage rating must support -30V maximum (or equivalent)
Protection features must include over-temperature and short-circuit protection

All substitute parts listed below meet these core electrical and mechanical requirements. Differences in operating temperature range, product status, and PSRR specifications do not affect functional substitutability for standard applications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Current Output	Input Voltage (Max)	Operating Temperature	Product Status	PSRR (120Hz)	Packaging
LM79L05ACZX	onsemi	-5V	100mA	-30V	0°C ~ 125°C	Obsolete	60dB	TO-92-3
MC79L05ABPRAG	onsemi	-5V	100mA	-30V	-40°C ~ 125°C	Active	49dB	TO-92-3
MC79L05ACPRAG	onsemi	-5V	100mA	-30V	0°C ~ 125°C	Active	49dB	TO-92-3
MC79L05ACPRMG	onsemi	-5V	100mA	-30V	0°C ~ 125°C	Active	49dB	TO-92-3
MC79L05ACPRPG	onsemi	-5V	100mA	-30V	0°C ~ 125°C	Active	49dB	TO-92-3
L79L05ABZ-AP	STMicroelectronics	-5V	100mA	-30V	-40°C ~ 125°C	Active	49dB	TO-92-3
MC79L05ACLPR	Texas Instruments	-5V	100mA	-20V	0°C ~ 125°C	Last Time Buy	49dB	TO-92-3
L79L05ACZ-TR	STMicroelectronics	-5V	100mA	-30V	0°C ~ 125°C	Active	49dB	TO-92-3

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete LM79L05ACZX, the following selection criteria apply:

Primary Substitutes (Active Status, Full Compatibility): MC79L05ACPRAG, MC79L05ACPRMG, and L79L05ACZ-TR are recommended as primary alternatives. These parts maintain identical electrical specifications, matching the original -30V input rating and 0°C to 125°C operating temperature range. All three carry active product status with RoHS3 compliance and REACH unaffected certification.

Extended Temperature Range Alternative: L79L05ABZ-AP (STMicroelectronics) and MC79L05ABPRAG (onsemi) extend the lower operating temperature to -40°C, suitable for applications requiring enhanced cold-temperature performance. Both maintain full electrical equivalence with active product status.

Limited Availability Alternative: MC79L05ACLPR (Texas Instruments) is available but classified as Last Time Buy. This part operates within the same temperature range as the original but supports a reduced maximum input voltage of -20V. Selection of this part requires confirmation that the application input voltage does not exceed -20V.

All substitute parts are RoHS3 compliant and carry REACH unaffected status, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use MC79L05ACPRAG as a direct replacement for LM79L05ACZX? A: Yes. Both parts deliver -5V fixed output at 100mA with identical input voltage ratings (-30V maximum) and matching operating temperature ranges (0°C to 125°C). The MC79L05ACPRAG is active and in stock, making it a suitable direct substitute.

Q: What is the difference between the onsemi MC79L05 variants (ABPRAG, ACPRAG, ACPRMG, ACPRPG)? A: These variants differ in operating temperature range and packaging designation. MC79L05ABPRAG supports -40°C to 125°C, while ACPRAG, ACPRMG, and ACPRPG support 0°C to 125°C. All maintain identical electrical output specifications and TO-92-3 packaging.

Q: Why does L79L05ABZ-AP show different PSRR than the original LM79L05ACZX? A: The original part specifies 60dB PSRR at 120Hz, while L79L05ABZ-AP specifies 49dB. Both values fall within acceptable ranges for linear regulator applications. The lower PSRR does not affect functional substitutability for standard power supply applications.

Q: Can I use MC79L05ACLPR if my circuit operates at -25V input? A: No. MC79L05ACLPR is rated for -20V maximum input voltage. Operating at -25V exceeds this specification. Use MC79L05ACPRAG, MC79L05ACPRMG, L79L05ACZ-TR, or L79L05ABZ-AP instead, all rated for -30V input.

Q: Are all substitute parts RoHS compliant? A: Yes. All active and Last Time Buy substitute parts listed carry RoHS3 compliance certification. The original LM79L05ACZX does not specify RoHS status, but all modern substitutes meet current regulatory requirements.

Q: What is the difference between Cut Tape (CT) and the original packaging? A: The original LM79L05ACZX does not specify packaging format. Substitute parts listed as Cut Tape (CT) are supplied on continuous tape suitable for automated assembly. The physical component and electrical performance remain identical to tube or reel packaging formats.

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