LM7812ACT Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM7812ACT is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 12V output at 1A in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The LM7812ACT provides over-temperature and short-circuit protection, suitable for power management applications requiring stable 12V regulation from input sources up to 35V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current (Iq)	8 mA
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the LM7812ACT is determined by the following critical parameters: fixed 12V output voltage, output current capability, maximum input voltage rating, package type (TO-220-3), and operating temperature range. Parts are grouped into three categories:

Direct Substitutes (1A Output, Active Status): Parts with identical 1A output current, 12V fixed output, 35V maximum input voltage, and TO-220-3 packaging. These are preferred for direct replacement in active production.

Similar Substitutes (500mA Output): Parts with reduced output current (500mA) but matching voltage specifications and package type. These are suitable only when circuit design permits lower current delivery.

Parametric Equivalents (1A Output, Extended Temperature): Parts with 1A output current and matching voltage specifications but extended operating temperature ranges (-40°C to 125°C). These provide enhanced thermal performance for demanding environments.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout	Quiescent Current	Operating Temperature	Product Status	Package
LM7812ACT	onsemi	1A	35V	2V @ 1A (Typ)	8 mA	0°C ~ 125°C	Obsolete	TO-220-3
MC7812ACTG	onsemi	1A	35V	2V @ 1A (Typ)	6 mA	0°C ~ 125°C	Active	TO-220-3
MC7812BTG	onsemi	1A	35V	2V @ 1A (Typ)	8 mA	-40°C ~ 125°C	Active	TO-220-3
MC7812CTG	onsemi	1A	35V	2V @ 1A (Typ)	6.5 mA	0°C ~ 125°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
AS7812AT-E1	Diodes Incorporated	1A	32V	2V @ 1A (Typ)	6 mA	-40°C ~ 125°C	Active	TO-220-3
L7812ABV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	6 mA	-40°C ~ 125°C	Active	TO-220-3
L7812ACV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	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

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select MC7812ACTG, MC7812CTG, or MC7812BTG. All three are active onsemi products with 1A output current, 12V fixed output, and TO-220-3 packaging. MC7812ACTG and MC7812CTG maintain the 0°C to 125°C operating range of the original LM7812ACT. MC7812BTG extends the operating range to -40°C to 125°C for applications requiring enhanced low-temperature performance.

For Extended Temperature Applications: Select MC7812BTG (onsemi, -40°C to 125°C), AS7812AT-E1 (Diodes Incorporated, -40°C to 125°C), L7812ABV (STMicroelectronics, -40°C to 125°C), or L7812CV (UMW, -40°C to 105°C). These parts maintain 1A output current while providing wider operating temperature ranges.

For Higher Current Capability: Select L7812ABV or L7812ACV (STMicroelectronics), both rated for 1.5A output current. These are suitable when circuit design requires current delivery exceeding 1A.

For Reduced Current Applications: Select MC78M12ACTG, MC78M12BTG, or MC78M12CTG (all onsemi, 500mA output). These are appropriate only when circuit requirements permit 500mA maximum output current.

Compliance Considerations: All active substitute parts listed are RoHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The original LM7812ACT is obsolete; active alternatives ensure long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can MC7812ACTG directly replace LM7812ACT? A: Yes. MC7812ACTG is an active onsemi product with identical electrical specifications: 1A output current, 12V fixed output, 35V maximum input voltage, 2V typical dropout at 1A, and TO-220-3 packaging. Operating temperature range is identical (0°C to 125°C).

Q: What is the difference between MC7812ACTG, MC7812BTG, and MC7812CTG? A: All three are onsemi 1A, 12V regulators in TO-220-3 packages. MC7812ACTG and MC7812CTG operate from 0°C to 125°C; MC7812BTG extends to -40°C to 125°C. Quiescent current varies slightly: MC7812ACTG and MC7812CTG at 6 mA, MC7812BTG at 8 mA. All are active products.

Q: Can I use MC78M12 series parts as substitutes? A: MC78M12 series parts (500mA output) are substitutes only if your circuit design permits reduced current delivery. The LM7812ACT is rated for 1A; MC78M12 parts deliver maximum 500mA. Verify circuit current requirements before selection.

Q: What are the advantages of L7812ABV over MC7812ACTG? A: L7812ABV (STMicroelectronics) provides 1.5A output current versus 1A for MC7812ACTG, and extends operating temperature to -40°C to 125°C. Both maintain 12V output and TO-220-3 packaging. Select L7812ABV for applications requiring higher current or wider temperature range.

Q: Is AS7812AT-E1 a suitable alternative? A: Yes. AS7812AT-E1 (Diodes Incorporated) delivers 1A output at 12V in TO-220-3 packaging with -40°C to 125°C operating range. Maximum input voltage is 32V versus 35V for LM7812ACT; verify your input voltage does not exceed 32V before selection.

Q: Are all substitute parts RoHS compliant? A: All active substitute parts listed are RoHS3 compliant. The original LM7812ACT is obsolete; active alternatives ensure compliance with current regulatory standards.

Q: What is the difference between TO-220-3 and TO-220 packaging? A: TO-220-3 and TO-220 refer to the same three-pin through-hole package format used for linear regulators. All parts listed use this identical package, ensuring mechanical and electrical compatibility.

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