KA7812AE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA7812AE is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 12V output at 1A current capacity in a TO-220-3 package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The KA7812AE delivers regulated 12V output from input voltages 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 (Iq)	6 mA
PSRR	60dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitute parts for the KA7812AE are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Fixed output voltage of 12V
Output current capacity of 1A or greater
Input voltage rating of 32V or higher
TO-220-3 package configuration
Through-hole mounting type
Over-temperature and short-circuit protection

Substitution Logic: Parts with identical output voltage (12V), equal or greater output current (≥1A), and compatible package are direct substitutes. Parts with 500mA output current (MC78M12 series) are not direct 1A equivalents but may be used in applications with reduced current requirements. Parts with higher output current capacity (1.5A) provide enhanced capability and are suitable for applications requiring the full 1A specification.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout	Iq (mA)	Operating Temp	Product Status	Package
KA7812AE	onsemi	12V	1A	35V	2V @ 1A	6	0°C ~ 125°C	Obsolete	TO-220-3
MC7812ACTG	onsemi	12V	1A	35V	2V @ 1A	6	0°C ~ 125°C	Active	TO-220-3
MC7812BTG	onsemi	12V	1A	35V	2V @ 1A	8	-40°C ~ 125°C	Active	TO-220-3
MC7812CTG	onsemi	12V	1A	35V	2V @ 1A	6.5	0°C ~ 125°C	Active	TO-220-3
AS7812AT-E1	Diodes Incorporated	12V	1A	32V	2V @ 1A	6	-40°C ~ 125°C	Active	TO-220-3
L7812ABV	STMicroelectronics	12V	1.5A	35V	2V @ 1A	6	-40°C ~ 125°C	Active	TO-220-3
L7812ACV	STMicroelectronics	12V	1.5A	35V	2V @ 1A	6	0°C ~ 125°C	Active	TO-220-3
L7812CV	UMW	12V	1.2A	35V	—	6	-40°C ~ 105°C	Active	TO-220-3

Engineering Selection Recommendations

Direct Equivalents (1A Output Current): MC7812ACTG, MC7812CTG, and AS7812AT-E1 are direct functional equivalents to the KA7812AE with identical 12V output and 1A current capacity. All three are active products with RoHS3 compliance. MC7812ACTG and MC7812CTG are onsemi products maintaining manufacturer continuity. AS7812AT-E1 from Diodes Incorporated offers extended operating temperature range (-40°C to 125°C) and is suitable for applications requiring wider temperature performance.

Enhanced Capability Substitutes (1.5A Output Current): L7812ABV and L7812ACV from STMicroelectronics provide 1.5A output current, exceeding the 1A specification of the KA7812AE. Both are active products with RoHS3 compliance. L7812ABV supports -40°C to 125°C operating range, while L7812ACV operates from 0°C to 125°C. These parts are suitable for designs requiring higher current capacity or thermal margin.

Extended Temperature Variant: MC7812BTG extends the operating temperature range to -40°C to 125°C while maintaining 1A output current and all other electrical specifications. This variant is appropriate for applications requiring enhanced low-temperature performance.

Alternative Sourcing: L7812CV from UMW provides 1.2A output current with 35V input rating and active product status. Operating temperature range is -40°C to 105°C, which is narrower than the original specification at the upper limit.

Frequently Asked Questions (FAQ)

Q: Can MC7812ACTG directly replace KA7812AE? A: Yes. MC7812ACTG is a direct equivalent with identical 12V output voltage, 1A output current, 35V maximum input voltage, and TO-220-3 package. Both share the same electrical specifications and protection features. MC7812ACTG is an active product, addressing the obsolescence of KA7812AE.

Q: What is the difference between MC7812ACTG, MC7812BTG, and MC7812CTG? A: All three are onsemi 12V/1A regulators in TO-220-3 packages with identical electrical performance. The primary difference is operating temperature range: MC7812ACTG and MC7812CTG operate from 0°C to 125°C, while MC7812BTG extends to -40°C. Quiescent current varies slightly: MC7812ACTG and MC7812CTG at 6-6.5mA, MC7812BTG at 8mA.

Q: Can I use L7812ABV or L7812ACV instead of KA7812AE? A: Yes. Both STMicroelectronics parts provide 1.5A output current, which exceeds the 1A requirement of KA7812AE. They maintain 12V output voltage, 35V input rating, and TO-220-3 package compatibility. The higher current capacity provides additional design margin. L7812ABV supports -40°C to 125°C; L7812ACV supports 0°C to 125°C.

Q: Is AS7812AT-E1 compatible with KA7812AE? A: Yes. AS7812AT-E1 from Diodes Incorporated is a direct equivalent with 12V output, 1A current, and TO-220-3 package. The maximum input voltage is 32V compared to 35V on KA7812AE, which is acceptable for most applications. AS7812AT-E1 offers extended temperature range (-40°C to 125°C) and is an active product.

Q: What about MC78M12 series parts (500mA output)? A: MC78M12ACTG, MC78M12BTG, and MC78M12CTG are not direct equivalents because they provide only 500mA output current, half the 1A specification of KA7812AE. These parts are suitable only for applications with reduced current requirements below 500mA.

Q: Are all substitute parts RoHS3 compliant? A: All active substitute parts listed (MC7812ACTG, MC7812BTG, MC7812CTG, AS7812AT-E1, L7812ABV, L7812ACV, L7812CV) are RoHS3 compliant. The original KA7812AE does not specify RoHS status.

Q: Which substitute offers the best thermal performance? A: L7812ABV and L7812ACV from STMicroelectronics provide 1.5A output current, offering the highest thermal margin above the 1A requirement. MC7812BTG and AS7812AT-E1 extend the operating temperature range to -40°C, suitable for extreme low-temperature applications.

Q: Can I mix different substitute parts in the same design? A: Yes, provided all parts meet the application's voltage, current, and temperature requirements. All listed substitutes maintain the same 12V output voltage, TO-220-3 package, and protection features, ensuring functional compatibility within a design.

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