LM7805CT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM7805CT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 1.5A maximum current. This through-hole TO-220-3 package component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The LM7805CT serves as a positive fixed output regulator suitable for power management applications requiring stable 5V regulation from input sources up to 35V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Maximum Output Current	1.5A
Maximum Input Voltage	35V
Voltage Dropout (Typical)	2V @ 1A
Quiescent Current	8 mA
PSRR	73dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-220-3 Through Hole
Output Configuration	Positive Fixed

Substitute Part Grouping Explanation

Substitution for the LM7805CT is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current Capability: Minimum 1A required; 1.5A preferred for full compatibility
Maximum Input Voltage: 25V minimum; 35V preferred
Package Type: TO-220-3 through-hole mounting
Output Configuration: Positive fixed regulation
Protection Features: Over temperature and short circuit protection required
Operating Temperature Range: Extended range (-40°C to 125°C) preferred for industrial applications

Substitute parts are grouped into two categories:

Direct Equivalents (1A output, full parameter match): MC7805CTG, UA7805CKCS, L7805ACV, L7805ACV-DG

Similar Alternatives (1A output, minor parameter variations): MC7805ACTG, MC7805BTG, L7805CV

Reduced Current Alternatives (500mA output, lower current rating): MC78M05ACTG, MC78M05BTG, MC78M05CTG

Parameter Comparison

Part Number	Manufacturer	Output Current	Max Input Voltage	Quiescent Current	PSRR (120Hz)	Operating Temp Range	Product Status	Package
LM7805CT	onsemi	1.5A	35V	8 mA	73dB	-40°C ~ 125°C	Obsolete	TO-220-3
MC7805CTG	onsemi	1A	35V	6.5 mA	83dB	0°C ~ 125°C	Active	TO-220-3
MC7805ACTG	onsemi	1A	35V	6 mA	83dB	0°C ~ 125°C	Active	TO-220-3
MC7805BTG	onsemi	1A	35V	8 mA	68dB	-40°C ~ 125°C	Active	TO-220-3
UA7805CKCS	Texas Instruments	1.5A	25V	Not specified	78dB ~ 68dB	0°C ~ 125°C	Last Time Buy	TO-220-3
L7805ACV	STMicroelectronics	1.5A	35V	6 mA	68dB	0°C ~ 125°C	Active	TO-220-3
L7805ACV-DG	STMicroelectronics	1.5A	35V	6 mA	68dB	0°C ~ 125°C	Active	TO-220-3
L7805CV	UMW	1.2A	35V	6 mA	Not specified	-40°C ~ 105°C	Active	TO-220-3
MC78M05ACTG	onsemi	500mA	35V	Not specified	80dB	0°C ~ 125°C	Obsolete	TO-220-3
MC78M05BTG	onsemi	500mA	35V	Not specified	80dB	-40°C ~ 125°C	Active	TO-220-3
MC78M05CTG	onsemi	500mA	35V	Not specified	80dB	0°C ~ 125°C	Active	TO-220-3

Engineering Selection Recommendations

Primary Substitutes (Full Compatibility)

MC7805BTG and L7805ACV-DG are the preferred direct substitutes. Both maintain the full 1.5A output current capability, 35V maximum input voltage, and extended operating temperature range (-40°C to 125°C for MC7805BTG; 0°C to 125°C for L7805ACV-DG). Both are active products with ROHS3 compliance and current production availability.

Secondary Substitutes (1A Output)

MC7805CTG, MC7805ACTG, and UA7805CKCS provide 1A output current, suitable for applications not requiring the full 1.5A capability. MC7805CTG and MC7805ACTG are onsemi products with active status and improved PSRR performance (83dB). UA7805CKCS is a Texas Instruments equivalent with Last Time Buy status, limiting future availability.

Alternative Substitute (1.2A Output)

L7805CV from UMW provides 1.2A output current with active product status and ROHS3 compliance. Operating temperature range is -40°C to 105°C, which is acceptable for most industrial applications but does not extend to the full 125°C upper limit.

Reduced Current Alternatives (500mA Output)

MC78M05BTG and MC78M05CTG are suitable only for applications with maximum current requirements of 500mA. These parts are not recommended as direct replacements for the LM7805CT in circuits designed for 1A or higher output current.

Frequently Asked Questions (FAQ)

Q: Can MC7805CTG directly replace LM7805CT?

A: MC7805CTG is functionally compatible but with reduced output current (1A versus 1.5A). It is suitable for applications drawing less than 1A. For circuits requiring the full 1.5A capability, L7805ACV or MC7805BTG are preferred.

Q: What is the difference between MC7805ACTG and MC7805BTG?

A: Both are 1A output regulators in TO-220-3 packages. MC7805ACTG operates from 0°C to 125°C with 6 mA quiescent current. MC7805BTG operates from -40°C to 125°C with 8 mA quiescent current. MC7805BTG is preferred for extended temperature range applications.

Q: Is UA7805CKCS a viable long-term substitute?

A: UA7805CKCS is a Texas Instruments equivalent with 1.5A output and Last Time Buy status. While currently available, its discontinued status makes it unsuitable for long-term production. L7805ACV or MC7805BTG are recommended for new designs.

Q: Can MC78M05 series parts replace LM7805CT?

A: MC78M05 series parts (500mA output) are not suitable direct replacements for circuits designed for 1A or 1.5A output. They are only applicable to low-current applications with maximum current requirements below 500mA.

Q: What are the compliance differences between substitutes?

A: All active substitute parts listed are ROHS3 compliant and REACH unaffected. Moisture sensitivity levels vary; STMicroelectronics L7805ACV and L7805ACV-DG are rated MSL 1 (Unlimited), while onsemi MC7805 series parts are Not Applicable or MSL 1 (Unlimited).

Q: Does package type vary among substitutes?

A: All substitutes use TO-220-3 through-hole packaging. Supplier device package designations may vary (TO-220 versus TO-220-3), but physical pin configuration and mounting compatibility remain identical.

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