AS7812AT-E1 Equivalent & Substitute Parts

Part Overview

The AS7812AT-E1 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed positive 12V output at 1A current capacity in a TO-220-3 through-hole package. This device is classified as a Power Management PMIC with active product status and is widely used in power supply circuits requiring regulated 12V rails with moderate current demands.

Substitute parts are necessary when the primary part becomes unavailable due to inventory constraints, supply chain disruptions, or when design flexibility permits selection from multiple qualified manufacturers offering equivalent electrical and mechanical performance.

Key Parameters

Parameter	AS7812AT-E1
Manufacturer	Diodes Incorporated
Output Voltage (Fixed)	12V
Output Current	1A
Input Voltage (Max)	32V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
PSRR	60dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-220-3
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the AS7812AT-E1 is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 12V
Output current rating of 1A or greater
TO-220-3 package configuration
Through-hole mounting type
Positive output configuration
Over temperature and short circuit protection

Secondary Compatibility Factors:

Input voltage maximum rating of 32V or higher
Operating temperature range encompassing -40°C to 125°C (or subset thereof)
ROHS3 compliance
Active or recently active product status

Substitute parts are grouped into two categories: direct equivalents (1A output current) and higher-capacity alternatives (1.2A to 1.5A output current). Higher-capacity devices provide design margin and are electrically compatible when the circuit topology permits increased current headroom.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Quiescent Current	Operating Temp Range	Product Status	Inventory
AS7812AT-E1	Diodes Incorporated	1A	32V	2V @ 1A (Typ)	6 mA	-40°C ~ 125°C	Active	25300 Pcs
L7812ABV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	6 mA	-40°C ~ 125°C	Active	28600 Pcs
L7812ACV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	6 mA	0°C ~ 125°C	Active	8587 Pcs
L7812CV	UMW	1.2A	35V	—	6 mA	-40°C ~ 105°C	Active	27570 Pcs
L7812CV-DG	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	8 mA	0°C ~ 125°C	Active	196300 Pcs
L78M12CV	STMicroelectronics	500mA	35V	—	6 mA	0°C ~ 125°C	Active	8795 Pcs
MC7812ACTG	onsemi	1A	35V	2V @ 1A (Typ)	6 mA	0°C ~ 125°C	Active	4403 Pcs
MC7812BTG	onsemi	1A	35V	2V @ 1A (Typ)	8 mA	-40°C ~ 125°C	Active	45100 Pcs
MC7812CTG	onsemi	1A	35V	2V @ 1A (Typ)	6.5 mA	0°C ~ 125°C	Active	105200 Pcs
MC78M12ACTG	onsemi	500mA	35V	—	—	0°C ~ 125°C	Obsolete	1737 Pcs
MC78M12BTG	onsemi	500mA	35V	—	—	-40°C ~ 125°C	Active	1152 Pcs

Engineering Selection Recommendations

Tier 1 Direct Equivalents (1A Output Current):

MC7812BTG and MC7812CTG from onsemi provide direct electrical equivalence to the AS7812AT-E1 with identical 1A output current, 2V typical dropout voltage, and 60dB PSRR. MC7812BTG maintains the full -40°C to 125°C operating range matching the original part. Both devices carry active product status and ROHS3 compliance. MC7812CTG operates from 0°C to 125°C. MC7812ACTG is also a direct 1A equivalent but carries reduced inventory.

Tier 2 Higher-Capacity Alternatives (1.2A to 1.5A Output Current):

L7812ABV, L7812ACV, and L7812CV-DG from STMicroelectronics offer increased output current capacity (1.2A to 1.5A) with identical 12V fixed output and TO-220-3 packaging. These devices are suitable for applications where additional current margin is beneficial. L7812ABV and L7812CV-DG maintain the full -40°C to 125°C operating range. L7812ACV and L7812CV-DG operate from 0°C to 125°C. L7812CV from UMW provides 1.2A capacity but operates only to 105°C maximum.

Tier 3 Lower-Capacity Alternatives (500mA Output Current):

L78M12CV and MC78M12BTG provide 500mA output current, suitable only for applications with reduced current requirements. MC78M12BTG maintains -40°C to 125°C operation and active product status. MC78M12ACTG is obsolete and should be avoided for new designs.

All substitute parts listed carry ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the AS7812AT-E1.

Frequently Asked Questions (FAQ)

Q: Can I use a higher-current substitute like the L7812ABV (1.5A) in place of the AS7812AT-E1 (1A)?

A: Yes. The L7812ABV provides identical 12V fixed output voltage, TO-220-3 package, and through-hole mounting. The higher 1.5A current rating is a superset of the 1A requirement and introduces no compatibility issues. The device operates within the same -40°C to 125°C temperature range as the original part.

Q: What is the difference between MC7812BTG and MC7812CTG?

A: Both devices provide 1A output current and identical electrical performance. MC7812BTG operates from -40°C to 125°C with 8 mA quiescent current. MC7812CTG operates from 0°C to 125°C with 6.5 mA quiescent current. Selection depends on the required minimum operating temperature for your application.

Q: Why should I avoid the MC78M12ACTG?

A: The MC78M12ACTG carries obsolete product status and provides only 500mA output current, insufficient for the 1A requirement of the AS7812AT-E1. Use MC78M12BTG instead if 500mA capacity is acceptable for your design.

Q: Are all substitute parts in the same TO-220-3 package?

A: Yes. All listed substitute parts use TO-220-3 through-hole packaging, ensuring mechanical and thermal compatibility with the original AS7812AT-E1 footprint.

Q: What is the significance of the voltage dropout specification?

A: Voltage dropout determines the minimum input voltage required to maintain regulated output. The AS7812AT-E1 specifies 2V typical dropout at 1A. Substitute parts with identical or lower dropout specifications maintain equivalent circuit performance. Parts without specified dropout values should be cross-referenced with manufacturer datasheets for critical applications.

Q: Can I use L7812CV from UMW if my application operates below -40°C?

A: No. The L7812CV operates from -40°C to 105°C only. For applications requiring operation below -40°C, use L7812ABV, L7812CV-DG, MC7812BTG, or the original AS7812AT-E1, all rated to -40°C minimum.

Q: Which substitute offers the best inventory availability?

A: L7812CV-DG from STMicroelectronics has the highest inventory at 196,300 pieces, followed by MC7812CTG from onsemi at 105,200 pieces. Both are active products with full temperature range coverage options.

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