KA7812ERTM Equivalent & Substitute Parts

Part Overview

The KA7812ERTM is a linear voltage regulator IC from onsemi, delivering a fixed positive 12V output at 1A in a DPAK surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The KA7812ERTM belongs to the Power Management (PMIC) category and is designed for 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
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution for the KA7812ERTM is determined by the following critical parameters:

Output Voltage: Must be fixed at 12V
Output Current Capability: Minimum 1A required for direct replacement; 500mA variants are functional alternatives for lower-current applications
Package Type: TO-252-3 DPAK (2 Leads + Tab) is mandatory for mechanical and thermal compatibility
Input Voltage Rating: Maximum 35V input support required
Protection Features: Over Temperature and Short Circuit protection required
Operating Temperature Range: -40°C to 125°C preferred for full compatibility; 0°C to 125°C variants acceptable for restricted temperature applications

Substitute parts are grouped into two categories:

Direct Replacements (1A Output): MC7812BDTG and MC7812CDTRKG maintain identical 1A output current specification
Functional Alternatives (500mA Output): MC78M12 series variants provide reduced output current but maintain all other critical parameters

Parameter Comparison

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Part Number	Manufacturer	Output Current	Output Voltage	Input Voltage (Max)	Dropout Voltage	Iq (mA)	Operating Temp	Product Status	Package
KA7812ERTM	onsemi	1A	12V	35V	2V @ 1A (Typ)	8	-40°C ~ 125°C	Obsolete	DPAK
MC7812BDTG	onsemi	1A	12V	35V	2V @ 1A (Typ)	8	-40°C ~ 125°C	Active	DPAK
MC7812CDTRKG	onsemi	1A	12V	35V	2V @ 1A (Typ)	6.5	0°C ~ 125°C	Active	DPAK
MC78M12ABDTRKG	onsemi	500mA	12V	35V	—	—	-40°C ~ 125°C	Active	DPAK
MC78M12ACDTG	onsemi	500mA	12V	35V	—	—	0°C ~ 125°C	Obsolete	DPAK
MC78M12ACDTRKG	onsemi	500mA	12V	35V	—	—	0°C ~ 125°C	Active	DPAK
MC78M12BDTG	onsemi	500mA	12V	35V	—	—	-40°C ~ 125°C	Active	DPAK
MC78M12BDTRKG	onsemi	500mA	12V	35V	—	—	-40°C ~ 125°C	Active	DPAK
MC78M12CDTG	onsemi	500mA	12V	35V	—	—	0°C ~ 125°C	Active	DPAK
MC78M12CDTRKG	onsemi	500mA	12V	35V	—	—	0°C ~ 125°C	Active	DPAK
NCV78M12BDTRKG	onsemi	500mA	12V	35V	—	—	-40°C ~ 125°C	Active	DPAK

Engineering Selection Recommendations

Primary Direct Replacements (1A Output)

MC7812BDTG and MC7812CDTRKG are the recommended direct substitutes for KA7812ERTM. Both are active products from onsemi with identical 12V fixed output and 1A current rating. MC7812BDTG supports the full -40°C to 125°C operating range matching the original part. MC7812CDTRKG operates from 0°C to 125°C and includes RoHS3 compliance certification. Both maintain the same DPAK package and protection features.

Functional Alternatives (500mA Output)

The MC78M12 series (MC78M12ABDTRKG, MC78M12ACDTRKG, MC78M12BDTG, MC78M12BDTRKG, MC78M12CDTG, MC78M12CDTRKG) and NCV78M12BDTRKG provide 500mA output current in the same DPAK package. These are suitable for applications where load current does not exceed 500mA. All MC78M12 variants are active products with RoHS3 compliance. NCV78M12BDTRKG includes automotive-grade qualification (AEC-Q100) for applications requiring automotive reliability standards.

Temperature range selection: Parts rated -40°C to 125°C (MC78M12ABDTRKG, MC78M12BDTG, MC78M12BDTRKG, NCV78M12BDTRKG) provide extended low-temperature operation. Parts rated 0°C to 125°C (MC7812CDTRKG, MC78M12ACDTG, MC78M12ACDTRKG, MC78M12CDTG, MC78M12CDTRKG) are suitable for standard industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can MC78M12 series (500mA) parts directly replace the KA7812ERTM (1A)?

A: MC78M12 variants are functional alternatives only if your application load current does not exceed 500mA. The reduced output current rating makes them unsuitable for applications requiring the full 1A specification. For 1A applications, use MC7812BDTG or MC7812CDTRKG.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging (BDTG, CDTG, ACDTG) is suitable for lower-volume applications and manual assembly. Tape & Reel (BDTRKG, CDTRKG, ACDTRKG) and Cut Tape & Digi-Reel packaging are designed for automated pick-and-place assembly. The electrical specifications remain identical; packaging choice depends on assembly process requirements.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry RoHS3 compliance certification. The original KA7812ERTM does not specify RoHS status in the provided data.

Q: Which substitute part has the lowest quiescent current?

A: MC7812CDTRKG specifies 6.5 mA quiescent current, compared to 8 mA for KA7812ERTM and MC7812BDTG. This represents a 18.75% reduction in standby power consumption.

Q: Can I use NCV78M12BDTRKG in non-automotive applications?

A: Yes. NCV78M12BDTRKG meets automotive qualification standards (AEC-Q100) but is electrically and mechanically compatible with standard industrial applications. Its automotive-grade reliability provides additional margin for demanding environments.

Q: What is the PSRR difference between substitute parts?

A: KA7812ERTM specifies 71dB PSRR at 120Hz. MC7812 series parts specify 60dB PSRR at 1kHz. MC78M12 series parts specify 80dB PSRR at 120Hz. PSRR measurement frequency and magnitude differ; verify ripple rejection requirements for your specific application.

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