AP78L12YG-13 Equivalent & Substitute Parts

Part Overview

The AP78L12YG-13 is a linear voltage regulator IC from Diodes Incorporated, designed to provide a fixed 12V positive output at 100mA in a surface-mount SOT-89-3 package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The part operates across a -20°C to 85°C temperature range and includes integrated over-temperature and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	100mA
Input Voltage (Max)	27V
Package Type	SOT-89-3 (TO-243AA)
Mounting Type	Surface Mount
Output Configuration	Positive Fixed
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-20°C to 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AP78L12YG-13 are qualified based on the following electrical and mechanical compatibility criteria:

Fixed 12V positive output voltage
100mA output current capability
SOT-89-3 package (TO-243AA case)
Surface-mount configuration
Over-temperature and short-circuit protection
ROHS3 compliance
Maximum input voltage rating of 27V or greater

The three substitute parts listed below meet all these core requirements while offering active product status and extended temperature operating ranges in certain variants.

Parameter Comparison

Parameter	AP78L12YG-13	AS78L12RTR-G1	L78L12ABUTR	L78L12ACUTR
Manufacturer	Diodes Incorporated	Diodes Incorporated	STMicroelectronics	STMicroelectronics
Output Voltage	12V	12V	12V	12V
Output Current	100mA	100mA	100mA	100mA
Input Voltage (Max)	27V	36V	35V	35V
Package	SOT-89-3	SOT-89-3	SOT-89-3	SOT-89-3
Quiescent Current	5 mA	6 mA	6 mA	6 mA
PSRR (120Hz)	54dB	42dB	42dB	42dB
Operating Temperature	-20°C to 85°C	-40°C to 125°C	-40°C to 125°C	0°C to 125°C
Protection Features	Over Temperature, Short Circuit	Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance, providing long-term availability compared to the obsolete AP78L12YG-13.

AS78L12RTR-G1 (Diodes Incorporated) maintains manufacturer continuity from the original part while offering extended maximum input voltage (36V) and expanded operating temperature range (-40°C to 125°C). This part is supplied in Tape & Reel packaging.

L78L12ABUTR (STMicroelectronics) provides the widest input voltage rating (35V) and includes over-current protection in addition to over-temperature and short-circuit protection. Operating temperature range extends to -40°C to 125°C. Moisture sensitivity is rated at MSL 1 (Unlimited). This part is supplied in Cut Tape & Digi-Reel® packaging.

L78L12ACUTR (STMicroelectronics) is functionally equivalent to L78L12ABUTR with identical electrical specifications and protection features. The primary difference is the operating temperature range, which starts at 0°C instead of -40°C. This part is also supplied in Cut Tape & Digi-Reel® packaging.

For applications requiring the lowest operating temperature limit, L78L12ABUTR is the appropriate selection. For applications with operating temperatures at or above 0°C, L78L12ACUTR offers equivalent functionality. Both STMicroelectronics parts include over-current protection, providing enhanced circuit protection compared to the original part.

Frequently Asked Questions (FAQ)

Q: Can AS78L12RTR-G1 be used as a direct replacement for AP78L12YG-13?

A: Yes. Both parts share identical output voltage (12V), output current (100mA), and SOT-89-3 packaging. AS78L12RTR-G1 is rated for higher maximum input voltage (36V vs. 27V) and extended operating temperature range (-40°C to 125°C vs. -20°C to 85°C), making it functionally compatible and superior in performance specifications.

Q: What is the difference between L78L12ABUTR and L78L12ACUTR?

A: Both parts are electrically identical with 12V output, 100mA current, and SOT-89-3 packaging. The distinction is operating temperature range: L78L12ABUTR operates from -40°C to 125°C, while L78L12ACUTR operates from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Do all substitute parts include the same protection features as the original AP78L12YG-13?

A: The original part includes over-temperature and short-circuit protection. AS78L12RTR-G1 provides identical protection. L78L12ABUTR and L78L12ACUTR include over-current protection in addition to over-temperature and short-circuit protection, offering enhanced circuit protection.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant, matching the compliance status of the original AP78L12YG-13.

Q: What packaging formats are available for these substitute parts?

A: AS78L12RTR-G1 is supplied in Tape & Reel (TR) format. L78L12ABUTR and L78L12ACUTR are supplied in Cut Tape (CT) & Digi-Reel® format. All three parts use the same SOT-89-3 package for PCB compatibility.

Q: Can I use these parts interchangeably in my design?

A: Yes, for applications operating within the overlapping temperature range (0°C to 85°C) and input voltage range (up to 27V). Verify your specific application requirements against each part's maximum ratings before final selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message