MC7812ECTBU Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The MC7812ECTBU is a linear voltage regulator IC from onsemi, classified as a positive fixed output regulator delivering 1A at 12V in a TO-220-3 package. This part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MC7812ECTBU serves applications requiring stable 12V regulated output from input sources up to 35V with integrated over-temperature and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	8 mA
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-220-3
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the MC7812ECTBU is determined by the following critical parameters: fixed 12V output voltage, 1A output current capability, TO-220-3 package compatibility, maximum 35V input voltage rating, and integrated thermal and short-circuit protection. Parts are grouped into two categories:

Direct Substitutes (1A Output Current): Parts meeting all electrical specifications of the MC7812ECTBU with identical 1A output current and 12V fixed output. These include MC7812BTG, MC7812ACTG, MC7812CTG, AS7812AT-E1, L7812ABV, L7812ACV, and L7812CV.

Reduced Current Alternatives (500mA Output Current): Parts with identical voltage regulation characteristics but reduced output current to 500mA. These include MC78M12ACTG, MC78M12BTG, and MC78M12CTG. These are suitable only for applications where load current does not exceed 500mA.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temp Range	Product Status	Package
MC7812ECTBU	onsemi	1A	35V	2V @ 1A	8 mA	-40°C ~ 125°C	Obsolete	TO-220-3
MC7812BTG	onsemi	1A	35V	2V @ 1A	8 mA	-40°C ~ 125°C	Active	TO-220-3
MC7812ACTG	onsemi	1A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Active	TO-220-3
MC7812CTG	onsemi	1A	35V	2V @ 1A	6.5 mA	0°C ~ 125°C	Active	TO-220-3
AS7812AT-E1	Diodes Incorporated	1A	32V	2V @ 1A	6 mA	-40°C ~ 125°C	Active	TO-220-3
L7812ABV	STMicroelectronics	1.5A	35V	2V @ 1A	6 mA	-40°C ~ 125°C	Active	TO-220-3
L7812ACV	STMicroelectronics	1.5A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Active	TO-220-3
L7812CV	UMW	1.2A	35V	—	6 mA	-40°C ~ 105°C	Active	TO-220-3
MC78M12ACTG	onsemi	500mA	35V	—	—	0°C ~ 125°C	Obsolete	TO-220-3
MC78M12BTG	onsemi	500mA	35V	—	—	-40°C ~ 125°C	Active	TO-220-3
MC78M12CTG	onsemi	500mA	35V	—	—	0°C ~ 125°C	Active	TO-220-3

Engineering Selection Recommendations

Primary Substitutes (Full 1A Capability):

MC7812BTG is the direct onsemi equivalent with active product status and identical electrical specifications. MC7812ACTG and MC7812CTG are active onsemi alternatives with lower quiescent current (6-6.5 mA vs. 8 mA) and reduced operating temperature range (0°C minimum vs. -40°C). Both are RoHS3 compliant.

L7812ABV and L7812ACV from STMicroelectronics provide 1.5A output current, exceeding the original 1A specification, with active status and RoHS3 compliance. L7812ABV supports the full -40°C to 125°C temperature range, while L7812ACV is rated 0°C to 125°C.

AS7812AT-E1 from Diodes Incorporated delivers 1A output with active status and RoHS3 compliance. Input voltage maximum is 32V (versus 35V), which is acceptable for most applications but should be verified against specific circuit requirements.

L7812CV from UMW provides 1.2A output current with active status and RoHS3 compliance. Operating temperature range is -40°C to 105°C, which is narrower than the original at the upper limit.

Reduced Current Alternatives (500mA Capability):

MC78M12BTG is the active onsemi 500mA variant with full -40°C to 125°C temperature range and RoHS3 compliance. MC78M12CTG is also active with 0°C to 125°C range. These are suitable only for applications with maximum load current of 500mA or less.

All substitute parts maintain TO-220-3 package compatibility, positive fixed output configuration, and integrated over-temperature and short-circuit protection.

Frequently Asked Questions (FAQ)

Q: Can MC7812ACTG or MC7812CTG replace MC7812ECTBU in all applications?

A: MC7812ACTG and MC7812CTG are electrically compatible with identical 1A output current and 12V fixed output. However, both have a minimum operating temperature of 0°C versus -40°C for the original. Verify your application's minimum operating temperature requirement before substitution.

Q: What is the difference between MC7812BTG and MC7812ACTG?

A: Both are onsemi 1A regulators with active status. MC7812BTG supports -40°C to 125°C operation with 8 mA quiescent current. MC7812ACTG operates 0°C to 125°C with 6 mA quiescent current. Select MC7812BTG for applications requiring extended low-temperature operation.

Q: Can L7812ABV be used as a direct replacement?

A: L7812ABV is mechanically and electrically compatible in TO-220-3 package with 12V fixed output. It provides 1.5A output current, exceeding the 1A requirement. It supports -40°C to 125°C operation and is RoHS3 compliant. It is a suitable upgrade substitute.

Q: Why would I choose a 500mA variant like MC78M12BTG?

A: The 500mA variants (MC78M12BTG, MC78M12CTG, MC78M12ACTG) are appropriate only for applications where load current does not exceed 500mA. They are not suitable for applications requiring the full 1A output of the original MC7812ECTBU.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed are RoHS3 compliant. The obsolete parts (MC7812ECTBU, MC78M12ACTG) have RoHS status listed as "ROHS3 Compliant" or "REACH Unaffected" but are no longer in production.

Q: What is the significance of the TO-220-3 package?

A: TO-220-3 is a three-pin through-hole package with standardized pin configuration (Input, Ground, Output). All listed substitutes maintain this package type, ensuring direct mechanical and electrical compatibility without PCB redesign.

Q: Does AS7812AT-E1 have any limitations compared to MC7812ECTBU?

A: AS7812AT-E1 from Diodes Incorporated has a maximum input voltage of 32V versus 35V for the original. This is acceptable for most applications but should be verified if your circuit uses input voltages between 32V and 35V.

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