KA78L12AD Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA78L12AD is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 12V output at 100mA. This device is classified as a positive fixed output regulator in the Power Management (PMIC) category, packaged in 8-SOIC surface mount configuration. The KA78L12AD is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across output voltage, current capacity, input voltage range, and thermal protection characteristics while accommodating different product statuses and packaging options.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	12V
Current - Output	100mA
Voltage - Input (Max)	35V
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Protection Features	Over Temperature, Short Circuit
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the KA78L12AD are qualified based on the following criteria:

Electrical Compatibility Requirements:

Fixed positive output voltage of 12V
Output current capacity of 100mA minimum
Maximum input voltage of 35V or greater
8-SOIC package configuration
Surface mount mounting type
Over temperature and short circuit protection

Substitution Logic: All listed substitute parts maintain identical output voltage (12V) and current rating (100mA) specifications. Input voltage ratings are either 35V or 27V, with 27V-rated parts (UA78L12 series) operating within acceptable limits for 35V-specified applications. Quiescent current variations (3mA to 6.5mA) and PSRR differences (42dB to 65dB) represent acceptable performance variations within the linear regulator category. Product status ranges from active to last-time-buy and obsolete, reflecting market availability rather than functional capability. Packaging options include tape & reel, cut tape, and tube configurations, all compatible with standard surface mount assembly processes.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Input (Max)	Voltage - Output	Current - Output	Current - Quiescent (Iq)	PSRR (120Hz)	Operating Temperature	Packaging
KA78L12AD	onsemi	Obsolete	35V	12V	100mA	6mA	65dB	0°C ~ 125°C	8-SOIC
MC78L12ABDR2G	onsemi	Active	35V	12V	100mA	6.5mA	42dB	-40°C ~ 125°C	Tape & Reel
MC78L12ACDR2G	onsemi	Active	35V	12V	100mA	6.5mA	42dB	0°C ~ 125°C	Cut Tape & Digi-Reel
NCV78L12ABDR2G	onsemi	Active	35V	12V	100mA	6.5mA	42dB	-40°C ~ 125°C	Cut Tape
L78L12ABD-TR	STMicroelectronics	Active	35V	12V	100mA	6mA	42dB	-40°C ~ 125°C	Cut Tape & Digi-Reel
L78L12ACD13TR	STMicroelectronics	Active	35V	12V	100mA	6mA	42dB	0°C ~ 125°C	Cut Tape & Digi-Reel
L78L12CD13TR	STMicroelectronics	Active	35V	12V	100mA	5.5mA	42dB	0°C ~ 125°C	Tape & Reel
LM78L12ACMX/NOPB	Texas Instruments	Active	35V	12V	100mA	3mA	54dB	0°C ~ 125°C	Cut Tape & Digi-Reel
UA78L12ACD	Texas Instruments	Last Time Buy	27V	12V	100mA	Not specified	42dB	0°C ~ 125°C	Tube
UA78L12ACDR	Texas Instruments	Active	27V	12V	100mA	Not specified	42dB	0°C ~ 125°C	Cut Tape & Digi-Reel
UA78L12ACDRG4	Texas Instruments	Last Time Buy	27V	12V	100mA	Not specified	42dB	0°C ~ 125°C	Tape & Reel

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility): MC78L12ACDR2G, L78L12ABD-TR, L78L12ACD13TR, and LM78L12ACMX/NOPB are recommended as primary substitutes. These parts are in active production status, maintain 35V maximum input voltage specification, and provide 12V/100mA output with identical package configuration. MC78L12ACDR2G and L78L12ACD13TR match the KA78L12AD operating temperature range (0°C ~ 125°C). LM78L12ACMX/NOPB offers superior quiescent current performance (3mA) and PSRR (54dB).

Extended Temperature Range Alternatives: MC78L12ABDR2G, NCV78L12ABDR2G, and L78L12ABD-TR support extended operating temperature range (-40°C ~ 125°C), suitable for applications requiring broader thermal performance. NCV78L12ABDR2G includes AEC-Q100 automotive qualification.

Last-Time-Buy Alternatives: UA78L12ACD and UA78L12ACDRG4 are designated last-time-buy, indicating limited future availability. These parts operate at 27V maximum input voltage, which is acceptable for applications designed for 35V-rated regulators but not recommended for new designs requiring full 35V input tolerance.

Compliance Considerations: All substitute parts maintain RoHS3 compliance and REACH unaffected status. MSL rating of 1 (unlimited) is consistent across all parts.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 27V maximum input rating in place of the KA78L12AD (35V rated)? A: Parts with 27V maximum input rating (UA78L12 series) are electrically compatible for applications where input voltage does not exceed 27V. For designs requiring full 35V input tolerance, use substitutes rated for 35V maximum input voltage.

Q: What is the difference between the various onsemi MC78L12 part numbers? A: MC78L12ABDR2G is rated for -40°C ~ 125°C operating temperature and supplied in tape & reel packaging. MC78L12ACDR2G is rated for 0°C ~ 125°C and supplied in cut tape & Digi-Reel packaging. Both maintain identical electrical specifications and 35V input voltage rating.

Q: Is the NCV78L12ABDR2G suitable for automotive applications? A: NCV78L12ABDR2G carries AEC-Q100 automotive qualification and is designated for automotive-grade applications. It maintains identical electrical specifications to other active substitutes while meeting automotive reliability standards.

Q: How do quiescent current differences affect circuit performance? A: Quiescent current variations (3mA to 6.5mA) represent normal performance variation within the linear regulator category. LM78L12ACMX/NOPB offers the lowest quiescent current at 3mA, beneficial for low-power standby applications. These differences do not affect output voltage or current regulation capability.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in tape & reel, cut tape & Digi-Reel, and tube packaging. All maintain 8-SOIC surface mount configuration. Packaging selection depends on assembly process requirements and volume specifications.

Q: Are all substitute parts RoHS3 compliant? A: All active and last-time-buy substitute parts listed are RoHS3 compliant with REACH unaffected status, matching the compliance profile of the KA78L12AD.

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