KA78L12AMTF Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA78L12AMTF is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 12V output at 100mA in a surface-mount SOT-89-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The KA78L12AMTF serves as a positive fixed output regulator with integrated over-temperature and short-circuit protection, suitable for low-power 12V supply applications requiring compact form factors.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	100mA
Input Voltage (Max)	35V
Quiescent Current	6 mA
Package Type	SOT-89-3 (TO-243AA)
Mounting Type	Surface Mount
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the KA78L12AMTF are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Fixed output voltage of 12V
Output current capability of 100mA minimum
Maximum input voltage rating of 25V or higher
Surface-mount SOT-89-3 package (TO-243AA)
Operating temperature range encompassing 0°C to 125°C
Integrated protection features (over-temperature and/or short-circuit protection)

Parts meeting these criteria are classified as direct substitutes. Parts with different package types (such as through-hole TO-92) or significantly different electrical ratings are listed separately due to application-specific constraints.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	Package	Mounting Type	Operating Temp	Product Status
KA78L12AMTF	onsemi	12V	100mA	35V	6 mA	SOT-89-3	Surface Mount	0°C ~ 125°C	Obsolete
L78L12ABUTR	STMicroelectronics	12V	100mA	35V	6 mA	SOT-89-3	Surface Mount	-40°C ~ 125°C	Active
L78L12ACUTR	STMicroelectronics	12V	100mA	35V	6 mA	SOT-89-3	Surface Mount	0°C ~ 125°C	Active
UA78L12ACPK	Texas Instruments	12V	100mA	27V	—	SOT-89-3	Surface Mount	0°C ~ 125°C	Active
UA78L12ACPKG3	Texas Instruments	12V	100mA	27V	—	SOT-89-3	Surface Mount	0°C ~ 125°C	Active
NJM78L12UA-TE1	Nisshinbo Micro Devices Inc.	12V	100mA	35V	6.5 mA	SOT-89-3	Surface Mount	-40°C ~ 85°C	Active
BDJ2FA1FP3-ZTL	Rohm Semiconductor	12V	100mA	25V	—	SOT-89-3	Surface Mount	-25°C ~ 85°C	Active
MC78L12ACPRMG	onsemi	12V	100mA	35V	6.5 mA	TO-92-3	Through Hole	0°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Substitutes (SOT-89-3 Surface Mount, Active Status)

L78L12ABUTR and L78L12ACUTR from STMicroelectronics are the preferred substitutes for the obsolete KA78L12AMTF. Both devices maintain identical electrical specifications (12V output, 100mA, 35V maximum input, 6mA quiescent current) and package compatibility. L78L12ABUTR supports an extended operating temperature range (-40°C to 125°C) and carries RoHS3 compliance. L78L12ACUTR matches the original operating range (0°C to 125°C) and is also RoHS3 compliant. Both are available in high inventory quantities.

UA78L12ACPK and UA78L12ACPKG3 from Texas Instruments are functionally equivalent substitutes with identical output specifications and SOT-89-3 packaging. These devices feature a lower maximum input voltage rating (27V versus 35V) and include reverse polarity protection. Both are RoHS3 compliant and actively produced.

NJM78L12UA-TE1 from Nisshinbo Micro Devices Inc. provides electrical equivalence with 35V maximum input rating and SOT-89-3 packaging. This device operates across -40°C to 85°C and is RoHS compliant. Quiescent current is marginally higher at 6.5mA.

BDJ2FA1FP3-ZTL from Rohm Semiconductor is a SOT-89-3 surface-mount substitute with 12V/100mA output specifications. The maximum input voltage is limited to 25V, and the operating temperature range is -25°C to 85°C. This device is RoHS3 compliant but carries MSL-3 moisture sensitivity.

Alternative Substitute (Through-Hole Package)

MC78L12ACPRMG from onsemi is a through-hole TO-92-3 package alternative. This device maintains electrical equivalence (12V, 100mA, 35V input) but requires different PCB layout and assembly processes. Selection of this part is appropriate only when through-hole mounting is a design requirement.

Frequently Asked Questions (FAQ)

Q: Can I directly replace KA78L12AMTF with any of the listed SOT-89-3 substitutes?

A: Yes, all SOT-89-3 surface-mount parts listed in the parameter comparison table are pin-compatible and electrically equivalent for standard 12V/100mA regulator applications. Verify that your circuit input voltage does not exceed the maximum rating of the selected substitute (27V for Texas Instruments parts, 25V for Rohm, 35V for STMicroelectronics and Nisshinbo).

Q: What is the difference between L78L12ABUTR and L78L12ACUTR?

A: Both are STMicroelectronics SOT-89-3 regulators with identical electrical specifications. The primary difference is operating temperature range: L78L12ABUTR operates from -40°C to 125°C, while L78L12ACUTR operates from 0°C to 125°C. Select L78L12ABUTR for applications requiring extended low-temperature operation.

Q: Why is MC78L12ACPRMG listed separately?

A: MC78L12ACPRMG uses a through-hole TO-92-3 package instead of surface-mount SOT-89-3. This part is suitable only for designs using through-hole assembly. If your PCB is designed for surface-mount components, use one of the SOT-89-3 alternatives.

Q: Are all substitute parts RoHS compliant?

A: All listed active substitutes are RoHS3 compliant or RoHS compliant. Verify specific RoHS certification status with your supplier if regulatory compliance documentation is required for your application.

Q: What is the significance of the maximum input voltage rating difference?

A: The KA78L12AMTF supports 35V maximum input. Texas Instruments parts (UA78L12ACPK, UA78L12ACPKG3) are rated to 27V, and Rohm (BDJ2FA1FP3-ZTL) to 25V. If your circuit applies input voltages above 27V, use STMicroelectronics (L78L12ABUTR, L78L12ACUTR), Nisshinbo (NJM78L12UA-TE1), or onsemi (MC78L12ACPRMG) alternatives.

Q: Can I use BDJ2FA1FP3-ZTL in applications with operating temperatures above 85°C?

A: No. BDJ2FA1FP3-ZTL is rated to 85°C maximum. For applications requiring operation up to 125°C, use L78L12ABUTR, L78L12ACUTR, UA78L12ACPK, UA78L12ACPKG3, or MC78L12ACPRMG.

Q: What does MSL-3 moisture sensitivity mean for BDJ2FA1FP3-ZTL?

A: MSL-3 indicates 168-hour moisture sensitivity. This part requires controlled storage conditions and has a limited shelf life after the moisture barrier bag is opened. Parts with MSL-1 (unlimited) or MSL-2 (1 year) offer more flexible handling. For applications with strict moisture control requirements, select alternatives with lower MSL ratings.

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