AS7812ADTR-E1 Equivalent & Substitute Parts

Part Overview

The AS7812ADTR-E1 is a linear voltage regulator IC from Diodes Incorporated, classified as a positive fixed output 12V 1A power management device in TO-252-3 (DPAK) surface mount packaging. This part is currently obsolete, making identification of functional equivalents and substitutes essential for design continuity and procurement planning. The regulator provides fixed 12V output with 1A current capability, integrated over-temperature and short-circuit protection, and operates across the industrial temperature range of -40°C to 125°C.

Key Parameters

Parameter	Value
Manufacturer Part Number	AS7812ADTR-E1
Manufacturer	Diodes Incorporated
Output Voltage (Fixed)	12V
Output Current	1A
Input Voltage (Max)	32V
Voltage Dropout (Typ)	2V @ 1A
Quiescent Current	6 mA
PSRR	60dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	-40°C to 125°C
Package	TO-252-3 (DPAK)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AS7812ADTR-E1 is determined by the following critical parameters:

Output Voltage: Must be fixed 12V
Output Configuration: Must be positive
Package Type: Must be TO-252-3 (DPAK) surface mount
Output Current Capability: Minimum 1A (or 500mA for current-limited applications)
Input Voltage Rating: Minimum 32V (35V preferred for margin)
Protection Features: Over-temperature and short-circuit protection required
Operating Temperature Range: Must support -40°C to 125°C or subset thereof
RoHS Compliance: ROHS3 Compliant

Substitutes are grouped into two categories:

Category 1 - Direct Parametric Equivalents (1A Output Current) Parts with identical 1A output current capability, matching all electrical specifications and temperature range.

Category 2 - Functional Substitutes (500mA Output Current) Parts with reduced output current (500mA) but identical voltage regulation, package, and protection features. These are suitable for applications where load current does not exceed 500mA.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout	Quiescent Current	PSRR	Operating Temp	Product Status	Package
AS7812ADTR-E1	Diodes Inc.	1A	32V	2V @ 1A	6 mA	60dB (120Hz)	-40°C to 125°C	Obsolete	TO-252-3
AS7812ADTR-G1	Diodes Inc.	1A	32V	2V @ 1A	6 mA	60dB (120Hz)	-40°C to 125°C	Active	TO-252-3
L78M12ABDT-TR	STMicroelectronics	500mA	35V	—	6 mA	55dB (120Hz)	-40°C to 125°C	Active	TO-252-3
L78M12ACDT-TR	STMicroelectronics	500mA	35V	—	6 mA	55dB (120Hz)	0°C to 125°C	Active	TO-252-3
L78M12CDT-TR	STMicroelectronics	500mA	35V	—	6 mA	55dB (120Hz)	0°C to 125°C	Active	TO-252-3
MC7812BDTG	onsemi	1A	35V	2V @ 1A	8 mA	60dB (1kHz)	-40°C to 125°C	Active	TO-252-3
MC7812BDTRKG	onsemi	1A	35V	2V @ 1A	8 mA	60dB (1kHz)	-40°C to 125°C	Active	TO-252-3
MC7812CDTRKG	onsemi	1A	35V	2V @ 1A	6.5 mA	60dB (1kHz)	0°C to 125°C	Active	TO-252-3
MC78M12ABDTRKG	onsemi	500mA	35V	—	—	80dB (120Hz)	-40°C to 125°C	Active	TO-252-3
MC78M12ACDTG	onsemi	500mA	35V	—	—	80dB (120Hz)	0°C to 125°C	Obsolete	TO-252-3
MC78M12ACDTRKG	onsemi	500mA	35V	—	—	80dB (120Hz)	0°C to 125°C	Active	TO-252-3

Engineering Selection Recommendations

Primary Recommendation: AS7812ADTR-G1

AS7812ADTR-G1 is the direct parametric equivalent from the same manufacturer (Diodes Incorporated). It maintains identical electrical specifications, output current rating (1A), operating temperature range (-40°C to 125°C), and package configuration. The part is currently in active production status with high inventory availability (60,200 pcs), ensuring supply continuity. ROHS3 compliance and REACH unaffected status match the original part.

Secondary Recommendations (1A Output Current):

MC7812BDTRKG and MC7812BDTG from onsemi provide 1A output current with identical voltage regulation and protection features. Both are active production parts with superior input voltage rating (35V vs. 32V), providing additional design margin. MC7812BDTRKG is available in cut tape and digi-reel packaging with 305,200 pcs inventory. Operating temperature range matches the original (-40°C to 125°C). Quiescent current is slightly elevated (8 mA vs. 6 mA).

MC7812CDTRKG from onsemi is also a 1A regulator with active status but operates over 0°C to 125°C temperature range, making it unsuitable for applications requiring -40°C operation.

Tertiary Recommendations (500mA Output Current):

L78M12ABDT-TR, L78M12ACDT-TR, and L78M12CDT-TR from STMicroelectronics are suitable only for applications where output current does not exceed 500mA. All three are active production parts with ROHS3 compliance. L78M12ABDT-TR supports the full -40°C to 125°C temperature range. L78M12ACDT-TR and L78M12CDT-TR operate over 0°C to 125°C only.

MC78M12ABDTRKG and MC78M12ACDTRKG from onsemi are 500mA regulators with superior PSRR (80dB vs. 60dB). MC78M12ABDTRKG supports -40°C to 125°C operation and is active production. MC78M12ACDTRKG is limited to 0°C to 125°C.

Avoid: MC78M12ACDTG is obsolete and should not be selected for new designs despite meeting electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can I use a 500mA substitute in place of the AS7812ADTR-E1?

A: Only if your application load current does not exceed 500mA. The AS7812ADTR-E1 is rated for 1A output. Substitutes with 500mA rating (L78M12ABDT-TR, L78M12ACDT-TR, L78M12CDT-TR, MC78M12ABDTRKG, MC78M12ACDTRKG) will operate correctly at reduced current levels but will thermally limit or shut down if load current approaches or exceeds 500mA.

Q: What is the difference between AS7812ADTR-E1 and AS7812ADTR-G1?

A: Both parts are from Diodes Incorporated with identical electrical specifications, output current (1A), voltage regulation (12V fixed), and operating temperature range (-40°C to 125°C). The primary difference is product status: AS7812ADTR-E1 is obsolete while AS7812ADTR-G1 is in active production. AS7812ADTR-G1 is the recommended direct replacement.

Q: Are all substitute parts in the same package?

A: Yes. All listed substitutes use TO-252-3 (DPAK) surface mount packaging with 2 leads plus tab configuration. Pin-to-pin compatibility is maintained across all parts listed.

Q: Do I need to change my PCB layout if I switch from AS7812ADTR-E1 to a substitute?

A: No. All substitute parts use identical TO-252-3 (DPAK) packaging. PCB footprints, land patterns, and thermal via requirements remain unchanged. Schematic connections are identical.

Q: Which substitute has the best temperature range coverage?

A: AS7812ADTR-G1, MC7812BDTG, MC7812BDTRKG, L78M12ABDT-TR, and MC78M12ABDTRKG all support the full -40°C to 125°C operating range. Parts designated with "C" temperature grade (L78M12ACDT-TR, L78M12CDT-TR, MC7812CDTRKG, MC78M12ACDTG, MC78M12ACDTRKG) are limited to 0°C to 125°C and are unsuitable for applications requiring sub-zero operation.

Q: What is the inventory status of recommended substitutes?

A: AS7812ADTR-G1 has 60,200 pcs available. MC7812BDTRKG has 305,200 pcs available. L78M12ABDT-TR has 95,400 pcs available. All recommended primary and secondary substitutes maintain active production status with substantial inventory levels.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original AS7812ADTR-E1.

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