LM7805ACT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM7805ACT is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output with 1.5A maximum output current in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The LM7805ACT serves as a positive fixed output regulator suitable for power management applications requiring stable 5V regulation from input voltages up to 35V.

Key Parameters

Parameter	Value
Manufacturer Part Number	LM7805ACT
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	TO-220-3
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Voltage - Input (Max)	35V
Current - Output	1.5A
Voltage Dropout (Max)	2V @ 1A (Typ)
Operating Temperature	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the LM7805ACT is determined by the following critical parameters:

Output Voltage: Fixed 5V output (non-negotiable)
Package Type: TO-220-3 through-hole mounting
Output Current Capability: Minimum 1.5A (or acceptable reduction to 1A for lower-power applications)
Input Voltage Range: Maximum 35V
Protection Features: Over temperature and short circuit protection
Output Configuration: Positive fixed regulator

Substitute parts are grouped into two categories based on output current rating:

Category 1 - Full Current Rating (1.5A): Parts maintaining the 1.5A output current specification of the original LM7805ACT.

Category 2 - Reduced Current Rating (500mA to 1A): Parts with lower output current ratings suitable for applications with reduced power requirements.

Parameter Comparison

Part Number	Manufacturer	Output Current	Voltage - Input (Max)	Voltage - Output	Operating Temperature	Product Status	Package
LM7805ACT	onsemi	1.5A	35V	5V	0°C ~ 125°C	Obsolete	TO-220-3
MC7805ACTG	onsemi	1A	35V	5V	0°C ~ 125°C	Active	TO-220-3
MC7805BTG	onsemi	1A	35V	5V	-40°C ~ 125°C	Active	TO-220-3
MC7805CTG	onsemi	1A	35V	5V	0°C ~ 125°C	Active	TO-220-3
MC78M05ACTG	onsemi	500mA	35V	5V	0°C ~ 125°C	Obsolete	TO-220-3
MC78M05BTG	onsemi	500mA	35V	5V	-40°C ~ 125°C	Active	TO-220-3
MC78M05CTG	onsemi	500mA	35V	5V	0°C ~ 125°C	Active	TO-220-3
NCV7805BTG	onsemi	1A	35V	5V	-40°C ~ 125°C	Obsolete	TO-220-3
L7805ABV	STMicroelectronics	1.5A	35V	5V	-40°C ~ 125°C	Active	TO-220-3
L78M05ABV	STMicroelectronics	500mA	35V	5V	-40°C ~ 125°C	Active	TO-220-3
L78M05CV	STMicroelectronics	500mA	35V	5V	0°C ~ 150°C	Active	TO-220-3

Engineering Selection Recommendations

Primary Substitute (Full Current Capability): L7805ABV (STMicroelectronics) is the recommended direct substitute for the LM7805ACT. It maintains the 1.5A output current rating, operates across an extended temperature range (-40°C to 125°C), and holds Active product status with RoHS3 compliance. This part provides identical electrical performance with superior availability and long-term support.

onsemi Alternatives (1A Output Current): MC7805ACTG, MC7805BTG, and MC7805CTG are active onsemi alternatives with 1A output current rating. These parts are suitable for applications where the full 1.5A capability is not required. MC7805BTG offers the widest operating temperature range (-40°C to 125°C) among the 1A variants.

Reduced Current Substitutes (500mA Output): MC78M05BTG, MC78M05CTG, and L78M05ABV are appropriate for lower-power applications. L78M05ABV (STMicroelectronics) provides extended temperature range support (-40°C to 125°C) with Active status. L78M05CV extends the upper operating temperature to 150°C for high-temperature environments.

Automotive Grade Option: NCV7805BTG (onsemi) is an automotive-qualified variant with AEC-Q100 certification, suitable for automotive applications requiring 1A output current and extended temperature range (-40°C to 125°C). This part is currently obsolete but remains available in inventory.

Frequently Asked Questions (FAQ)

Q: Can MC7805CTG directly replace LM7805ACT in all applications? A: MC7805CTG is a direct pin-compatible substitute in TO-220-3 package with identical 5V output and 35V maximum input voltage. However, it provides 1A maximum output current versus the LM7805ACT's 1.5A. Substitution is valid only if your application requires 1A or less. Operating temperature range matches (0°C to 125°C).

Q: What is the difference between MC7805 and MC78M05 series? A: The MC7805 series provides 1A output current, while MC78M05 series provides 500mA output current. Both maintain 5V fixed output and TO-220-3 packaging. Selection depends on your circuit's current requirements.

Q: Is L7805ABV compatible with LM7805ACT? A: Yes. L7805ABV is pin-compatible in TO-220-3 package with identical 5V output, 1.5A current rating, and 35V maximum input. It offers extended temperature range (-40°C to 125°C) and Active product status, making it the preferred long-term substitute.

Q: Why should I avoid NCV7805BTG despite automotive qualification? A: NCV7805BTG is currently obsolete, limiting long-term availability. While it provides 1A output and automotive-grade reliability, active alternatives like MC7805BTG or L7805ABV offer better supply chain continuity.

Q: Can I use a 500mA regulator (MC78M05 or L78M05) instead of 1.5A? A: Only if your application draws 500mA or less. Using an undersized regulator in higher-current applications causes thermal stress, voltage regulation failure, and potential component damage. Verify actual circuit current draw before substitution.

Q: What packaging considerations apply to these substitutes? A: All listed substitutes use TO-220-3 through-hole package, maintaining identical PCB footprint and thermal characteristics. No layout modifications are required for mechanical compatibility.

Q: Are there RoHS compliance differences between substitutes? A: All active substitutes listed (MC7805 series, L7805 series, L78M05 series) are RoHS3 compliant. The obsolete LM7805ACT and MC78M05ACTG are not marked as RoHS compliant, making active substitutes preferable for new designs.

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