MC7815AECTBU Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The MC7815AECTBU is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 15V output at 1A current capacity in a TO-220-3 package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The MC7815AECTBU operates across an input voltage range up to 35V with a maximum dropout voltage of 2V at 1A, incorporating over-temperature and short-circuit protection features suitable for power management applications requiring stable 15V regulation.

Key Parameters

Parameter	Value
Manufacturer Part Number	MC7815AECTBU
Manufacturer	onsemi
Output Voltage (Fixed)	15V
Output Current	1A
Input Voltage (Max)	35V
Dropout Voltage (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
PSRR	58dB (120Hz)
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C
Package / Case	TO-220-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the MC7815AECTBU is determined by the following critical parameters: fixed output voltage of 15V, output current capacity of 1A or greater, input voltage maximum of 35V or higher, TO-220-3 package compatibility, and identical protection features (over-temperature and short-circuit). Parts meeting these criteria are grouped into two categories:

Category 1: Direct Equivalents (1A Output Current) Parts with 1A output current rating, matching the original specification exactly. These include onsemi MC7815 variants (ABTG, ACTG, BTG, CTG) and cross-manufacturer alternatives (AS7815AT-E1 from Diodes Incorporated).

Category 2: Higher Current Alternatives (1.5A Output Current) Parts with 1.5A output current rating from STMicroelectronics (L7815 series). These provide enhanced current capacity while maintaining all other electrical parameters within acceptable substitution limits.

Category 3: Reduced Current Alternatives (500mA Output Current) Parts with 500mA output current rating (MC78M15 series). These are suitable only for applications with reduced current requirements and are not recommended as direct substitutes for 1A-rated designs.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	PSRR	Operating Temp	Product Status
MC7815AECTBU	onsemi	15V	1A	35V	2V @ 1A	6 mA	58dB	0°C ~ 125°C	Obsolete
MC7815ABTG	onsemi	15V	1A	35V	2V @ 1A	6 mA	80dB	-40°C ~ 125°C	Active
MC7815ACTG	onsemi	15V	1A	35V	2V @ 1A	6 mA	80dB	0°C ~ 125°C	Active
MC7815BTG	onsemi	15V	1A	35V	2V @ 1A	8 mA	58dB	-40°C ~ 125°C	Active
MC7815CTG	onsemi	15V	1A	35V	2V @ 1A	6.5 mA	58dB	0°C ~ 125°C	Active
AS7815AT-E1	Diodes Incorporated	15V	1A	32V	2V @ 1A	6 mA	58dB	-40°C ~ 125°C	Active
L7815ABV	STMicroelectronics	15V	1.5A	35V	2V @ 1A	6 mA	58dB	-40°C ~ 125°C	Active
L7815ACV	STMicroelectronics	15V	1.5A	35V	2V @ 1A	6 mA	58dB	0°C ~ 125°C	Active
L7815ACV-DG	STMicroelectronics	15V	1.5A	35V	2V @ 1A	6 mA	58dB	0°C ~ 125°C	Active
MC78M15ABTG	onsemi	15V	500mA	35V	—	—	70dB	-40°C ~ 125°C	Obsolete
MC78M15CTG	onsemi	15V	500mA	35V	—	—	70dB	0°C ~ 125°C	Active

Engineering Selection Recommendations

For applications requiring direct replacement of the MC7815AECTBU with active product status and equivalent electrical performance, the following parts are recommended in order of priority:

Primary Recommendation: MC7815CTG (onsemi) Active product status with identical 1A output current, 15V fixed output, and matching electrical specifications. Maintains onsemi manufacturing continuity and ROHS3 compliance. Suitable for designs operating within 0°C to 125°C temperature range.

Secondary Recommendation: MC7815ABTG (onsemi) Active product status with extended operating temperature range (-40°C to 125°C) and improved PSRR performance (80dB vs. 58dB). Recommended for applications requiring wider temperature operation or enhanced noise rejection.

Alternative Recommendation: L7815ABV (STMicroelectronics) Active product status with 1.5A output current capacity, providing design margin for current-limited applications. Extended temperature range (-40°C to 125°C) and ROHS3 compliance. Suitable when higher current capacity is beneficial.

Cross-Manufacturer Option: AS7815AT-E1 (Diodes Incorporated) Active product status with 1A output current and extended temperature range (-40°C to 125°C). Input voltage maximum of 32V is within acceptable tolerance for most 35V-rated designs. ROHS3 compliant.

Not Recommended: MC78M15 Series (500mA Output) These parts feature reduced output current (500mA) and are unsuitable as direct substitutes for 1A-rated designs. Use only in applications with confirmed current requirements below 500mA.

Frequently Asked Questions (FAQ)

Q: Can MC7815CTG directly replace MC7815AECTBU in existing designs? A: Yes. MC7815CTG maintains identical electrical specifications (15V output, 1A current, 35V input maximum, 2V dropout voltage) and TO-220-3 package compatibility. Both incorporate over-temperature and short-circuit protection. The primary difference is product status: MC7815AECTBU is obsolete while MC7815CTG is active.

Q: What is the difference between MC7815ABTG and MC7815CTG? A: Both are 1A, 15V regulators in TO-220-3 packages. MC7815ABTG offers extended operating temperature (-40°C to 125°C vs. 0°C to 125°C) and higher PSRR (80dB vs. 58dB). MC7815CTG is recommended for standard temperature range applications. Selection depends on thermal and noise performance requirements.

Q: Can L7815ABV be used instead of MC7815AECTBU? A: Yes, with design considerations. L7815ABV provides 1.5A output current versus 1A, offering additional current capacity. All other electrical parameters match: 15V output, 35V input maximum, 2V dropout voltage, and TO-220-3 package. The higher current rating makes it suitable for applications requiring design margin.

Q: What is the significance of the input voltage maximum difference between AS7815AT-E1 (32V) and MC7815AECTBU (35V)? A: AS7815AT-E1 has a 32V maximum input rating versus 35V for the original part. This 3V difference is within acceptable tolerance for most power supply designs. Verify that your application's maximum input voltage does not exceed 32V before selecting this substitute.

Q: Why are MC78M15 parts listed if they cannot replace MC7815AECTBU? A: MC78M15 parts (500mA output) are included for reference as related products within the MC7815 family. They are not suitable as direct substitutes due to reduced current capacity. Use only in applications with confirmed current requirements below 500mA.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed (MC7815ABTG, MC7815ACTG, MC7815BTG, MC7815CTG, AS7815AT-E1, L7815ABV, L7815ACV, L7815ACV-DG, MC78M15CTG) are ROHS3 compliant. The original MC7815AECTBU does not specify ROHS status.

Q: Can I use MC7815ACTG if my application operates at 0°C to 125°C? A: Yes. MC7815ACTG is rated for 0°C to 125°C operation, matching the original MC7815AECTBU temperature range. It is an active product with identical electrical specifications and is a direct substitute.

Q: What packaging format should I specify when ordering substitute parts? A: All substitute parts listed are available in TO-220-3 package format with through-hole mounting. Verify packaging designation (Tube vs. other formats) with your supplier based on procurement requirements. The electrical performance is identical across packaging variants.

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