KA79M12RTM Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA79M12RTM is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed negative 12V output at 500mA. This negative fixed output regulator operates with an input voltage range up to -35V and includes protection features for over temperature and short circuit conditions. The device is packaged in TO-252-3 DPAK format suitable for surface mount applications.

The KA79M12RTM is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Key Parameters

Parameter	Value
Output Configuration	Negative
Output Type	Fixed
Output Voltage	-12V
Output Current	500mA
Input Voltage (Max)	-35V
Voltage Dropout (Max)	1.1V @ 500mA
PSRR	60dB (120Hz)
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitute parts for the KA79M12RTM are identified based on strict electrical and mechanical parameter matching:

Electrical Equivalence Criteria:

Output configuration: Negative
Output type: Fixed
Output voltage: -12V
Output current: 500mA minimum
Input voltage rating: -35V or greater
Voltage dropout: 1.1V @ 500mA or lower
PSRR: 60dB (120Hz) or better
Protection features: Over temperature and short circuit protection

Mechanical Equivalence Criteria:

Package / Case: TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting type: Surface Mount

The substitute parts identified below meet all specified electrical and mechanical parameters and are therefore suitable for direct replacement in applications designed for the KA79M12RTM.

Parameter Comparison

Parameter	KA79M12RTM	MC79M12BDTRKG	MC79M12CDTRKG
Manufacturer	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active
Output Configuration	Negative	Negative	Negative
Output Type	Fixed	Fixed	Fixed
Output Voltage	-12V	-12V	-12V
Output Current	500mA	500mA	500mA
Input Voltage (Max)	-35V	-35V	-35V
Voltage Dropout (Max)	1.1V @ 500mA	1.1V @ 500mA (Typ)	1.1V @ 500mA (Typ)
PSRR	60dB (120Hz)	60dB (120Hz)	60dB (120Hz)
Operating Temperature	0°C ~ 125°C	-40°C ~ 125°C	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit	Over Current, Over Temperature	Over Current, Over Temperature
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both MC79M12BDTRKG and MC79M12CDTRKG are active production parts manufactured by onsemi and provide direct electrical and mechanical equivalence to the obsolete KA79M12RTM.

MC79M12BDTRKG is suitable for applications requiring extended operating temperature range, supporting -40°C to 125°C operation compared to the KA79M12RTM's 0°C to 125°C range. This part includes over current protection in addition to over temperature protection.

MC79M12CDTRKG maintains the same operating temperature range as the KA79M12RTM (0°C to 125°C) and includes over current protection. This part provides the closest thermal operating profile match to the original device.

Both substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. Selection between these two parts should be based on the specific operating temperature requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can MC79M12BDTRKG and MC79M12CDTRKG be used interchangeably with KA79M12RTM?

A: Yes. Both parts meet all specified electrical parameters (output voltage, current, input voltage rating, voltage dropout, and PSRR) and are packaged identically in TO-252-3 DPAK format. They are direct substitutes for surface mount applications.

Q: What is the difference between MC79M12BDTRKG and MC79M12CDTRKG?

A: The primary difference is operating temperature range. MC79M12BDTRKG operates from -40°C to 125°C, while MC79M12CDTRKG operates from 0°C to 125°C. Both provide identical electrical performance and protection features. Selection depends on whether your application requires the extended low-temperature capability.

Q: Are the substitute parts pin-compatible with KA79M12RTM?

A: Yes. All three parts use the TO-252-3 DPAK package with 2 leads plus tab (SC-63), ensuring identical pinout and PCB footprint compatibility.

Q: Do the substitute parts have the same protection features as KA79M12RTM?

A: The substitute parts include over current protection in addition to the over temperature and short circuit protection present in the KA79M12RTM. This provides enhanced protection without affecting electrical compatibility.

Q: Are there any compliance or regulatory differences?

A: MC79M12BDTRKG and MC79M12CDTRKG are both ROHS3 compliant and REACH unaffected. The KA79M12RTM compliance status is not specified. Both substitutes meet current regulatory requirements for new designs and production.

Q: What packaging options are available for the substitute parts?

A: MC79M12BDTRKG and MC79M12CDTRKG are supplied in Cut Tape (CT) and Digi-Reel format, providing standard component packaging for automated assembly processes.

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