LM79M05CT/NOPB Equivalent & Substitute Parts

Part Overview

The LM79M05CT/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed negative 5V output at 500mA. This is a negative fixed output regulator in TO-220-3 package configuration. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM79M05CT/NOPB
Manufacturer	Texas Instruments
Output Configuration	Negative
Output Type	Fixed
Voltage - Output (Min/Fixed)	-5V
Current - Output	500mA
Voltage - Input (Max)	-25V
Voltage Dropout (Max)	1.1V @ 500mA
Package / Case	TO-220-3
Operating Temperature	0°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LM79M05CT/NOPB is determined by the following critical parameters:

Output voltage specification: -5V fixed output
Output configuration: Negative polarity
Package type: TO-220-3 through-hole mounting
Electrical compatibility: Negative input voltage range, dropout voltage, and output current capability
Regulatory compliance: ROHS3 compliance and REACH unaffected status

The substitute parts listed maintain the core functional requirements of -5V negative fixed output regulation in TO-220-3 packaging. All substitutes are active products from established manufacturers, providing long-term availability compared to the obsolete main part.

Parameter Comparison

Parameter	LM79M05CT/NOPB	L7905ACV	L7905CV	MC7905BTG	MC7905CTG
Manufacturer	Texas Instruments	STMicroelectronics	STMicroelectronics	onsemi	onsemi
Output Voltage	-5V	-5V	-5V	-5V	-5V
Output Current	500mA	1.5A	1.5A	1A	1A
Voltage - Input (Max)	-25V	-35V	-35V	-35V	-35V
Voltage Dropout (Max)	1.1V @ 500mA	1.4V @ 1A (Typ)	1.4V @ 1A (Typ)	1.3V @ 1A (Typ)	1.3V @ 1A (Typ)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the main part. The L7905ACV and L7905CV from STMicroelectronics provide higher output current capability (1.5A) and extended maximum input voltage rating (-35V) compared to the original specification. The MC7905BTG and MC7905CTG from onsemi offer 1A output current with improved PSRR performance (70dB vs 66dB) and are active products with established supply chains.

Selection between substitutes should be based on application current requirements and thermal management considerations. Parts with higher current ratings provide design margin but may require thermal management evaluation in existing PCB layouts. All substitutes are pin-compatible in TO-220-3 packaging and maintain the same output voltage specification.

Frequently Asked Questions (FAQ)

Q: Can I use L7905ACV or L7905CV as direct replacements for LM79M05CT/NOPB?

A: Yes. Both parts maintain -5V fixed negative output, TO-220-3 package compatibility, and equivalent electrical performance. The higher current rating (1.5A vs 500mA) and extended input voltage range (-35V vs -25V) provide additional design margin without affecting existing circuit operation.

Q: What is the difference between MC7905BTG and MC7905CTG?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is operating temperature range: MC7905BTG operates from -40°C to 125°C, while MC7905CTG operates from 0°C to 125°C. Selection depends on application temperature requirements.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use TO-220-3 through-hole package configuration, maintaining mechanical and electrical compatibility with the original LM79M05CT/NOPB footprint.

Q: Why is the LM79M05CT/NOPB listed as obsolete?

A: The part is no longer manufactured by Texas Instruments. The substitute parts from STMicroelectronics and onsemi provide equivalent functionality with active product status and established long-term availability.

Q: Do all substitutes meet the same compliance standards?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the original part.

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