AS7815AT-E1 Equivalent & Substitute Parts

Part Overview

The AS7815AT-E1 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed positive 15V output at 1A current capacity in a TO-220-3 package. This device is classified as a Power Management PMIC with active product status and is widely used in power supply circuits requiring regulated 15V rails.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements call for enhanced performance characteristics such as higher output current capacity, improved PSRR, or extended temperature operating ranges. The parts listed below maintain electrical and mechanical compatibility within defined parameter tolerances.

Key Parameters

Parameter	AS7815AT-E1
Manufacturer	Diodes Incorporated
Output Voltage (Fixed)	15V
Output Current	1A
Input Voltage (Max)	32V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
PSRR	58dB (120Hz)
Operating Temperature	-40°C ~ 125°C
Package / Case	TO-220-3
Protection Features	Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the AS7815AT-E1 are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Fixed output voltage of 15V
TO-220-3 package configuration
Positive output configuration
Through-hole mounting type
Over temperature and short circuit protection
ROHS3 compliance and REACH unaffected status

Secondary Performance Criteria:

Output current capacity (1A minimum for direct substitution; higher ratings acceptable for upgraded designs)
Input voltage maximum rating (32V minimum)
Voltage dropout characteristics
Quiescent current specifications
PSRR performance at 120Hz
Operating temperature range (-40°C to 125°C preferred for extended range applications)

Parts are classified into three substitution categories: direct equivalents (matching 1A output), upgraded capacity alternatives (1.5A output), and specialized variants (500mA or 2A output for specific applications).

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	Quiescent Current	PSRR (120Hz)	Operating Temp	Product Status
AS7815AT-E1	Diodes Incorporated	1A	32V	2V @ 1A (Typ)	6 mA	58dB	-40°C ~ 125°C	Active
L7815ABV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	6 mA	58dB	-40°C ~ 125°C	Active
L7815ACV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	6 mA	58dB	0°C ~ 125°C	Active
L7815CV	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	8 mA	54dB	0°C ~ 125°C	Active
L7815CV-DG	STMicroelectronics	1.5A	35V	2V @ 1A (Typ)	8 mA	54dB	0°C ~ 125°C	Active
L78M15ABV	STMicroelectronics	500mA	35V	Not Specified	6 mA	54dB	-40°C ~ 125°C	Obsolete
L78M15CV	STMicroelectronics	500mA	35V	Not Specified	6 mA	54dB	0°C ~ 125°C	Obsolete
L78S15CV	STMicroelectronics	2A	35V	Not Specified	8 mA	46dB	0°C ~ 150°C	Obsolete
LM340T-15/NOPB	Texas Instruments	1.5A	35V	2V @ 1A	8 mA	80dB	0°C ~ 125°C	Active
LM341T-15/NOPB	Texas Instruments	500mA	35V	Not Specified	4 mA	69dB	-40°C ~ 125°C	Active
MC7815ACTG	onsemi	1A	35V	2V @ 1A (Typ)	6 mA	80dB	0°C ~ 125°C	Active

Engineering Selection Recommendations

Direct Substitution (Equivalent Performance): MC7815ACTG from onsemi serves as the closest direct equivalent to AS7815AT-E1, matching the 1A output current specification while maintaining identical voltage dropout and quiescent current characteristics. Both devices are active products with ROHS3 compliance and REACH unaffected status. MC7815ACTG offers superior PSRR performance at 80dB compared to the original 58dB specification.

Upgraded Capacity Alternatives (Higher Current Rating): L7815ABV and L7815ACV from STMicroelectronics provide 1.5A output current capacity, representing a 50% increase over the AS7815AT-E1 specification. Both maintain identical voltage dropout characteristics and are active products with full compliance certifications. L7815ABV extends the operating temperature range to -40°C ~ 125°C, matching the original device. L7815ACV operates within 0°C ~ 125°C range.

L7815CV and L7815CV-DG offer the same 1.5A capacity with marginally higher quiescent current (8mA vs 6mA) and reduced PSRR (54dB vs 58dB). Both are active products suitable for applications where the performance trade-off is acceptable.

LM340T-15/NOPB from Texas Instruments provides 1.5A output with superior PSRR performance at 80dB and is an active product. Operating temperature range is 0°C ~ 125°C.

Lower Current Alternatives (Reduced Capacity): L78M15ABV, L78M15CV, and LM341T-15/NOPB are rated for 500mA output current. These parts are suitable only for applications where load current does not exceed 500mA. L78M15ABV and L78M15CV are obsolete products. LM341T-15/NOPB is an active product with extended temperature range (-40°C ~ 125°C) and lower quiescent current (4mA).

Higher Current Alternative (Increased Capacity): L78S15CV from STMicroelectronics provides 2A output capacity with extended operating temperature to 150°C. This part is obsolete and should be used only when higher current capacity is required and supply availability permits.

Frequently Asked Questions (FAQ)

Q: Can I use L7815ABV as a direct replacement for AS7815AT-E1? A: Yes. L7815ABV is functionally compatible with AS7815AT-E1. It maintains the same 15V output voltage, TO-220-3 package, and identical voltage dropout characteristics. The higher 1.5A output current rating is backward compatible with 1A applications. Both devices are active products with ROHS3 compliance.

Q: What is the difference between L7815ABV and L7815ACV? A: Both parts provide 1.5A output current and identical electrical performance. The primary difference is operating temperature range: L7815ABV operates from -40°C to 125°C, while L7815ACV operates from 0°C to 125°C. Select L7815ABV for applications requiring extended low-temperature operation.

Q: Why are some substitute parts marked as obsolete? A: L78M15ABV, L78M15CV, and L78S15CV are obsolete products no longer in active production. These parts should be used only when specific performance characteristics (such as 500mA or 2A output) are required and existing inventory is available. For new designs, select from active product alternatives.

Q: Is MC7815ACTG a suitable replacement for AS7815AT-E1? A: Yes. MC7815ACTG matches the 1A output current specification and maintains identical voltage dropout and quiescent current characteristics. It offers superior PSRR performance at 80dB. MC7815ACTG is an active product with full compliance certifications. The operating temperature range is 0°C ~ 125°C, which is narrower than the original -40°C ~ 125°C specification.

Q: Can I use a 500mA rated part in place of AS7815AT-E1? A: No. Parts rated for 500mA output current (L78M15ABV, L78M15CV, LM341T-15/NOPB) are not suitable for applications requiring 1A output. These parts will operate at reduced capacity and may not meet load current requirements. Use only if application load current does not exceed 500mA.

Q: What is the significance of PSRR in regulator selection? A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject input voltage ripple and noise. Higher PSRR values indicate better noise rejection. AS7815AT-E1 specifies 58dB at 120Hz. Substitute parts with higher PSRR (such as MC7815ACTG and LM340T-15/NOPB at 80dB) provide superior noise performance in applications with noisy input supplies.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the compliance status of AS7815AT-E1. This ensures compatibility with environmental and regulatory requirements.

Q: What package options are available? A: All substitute parts use TO-220-3 package configuration, maintaining mechanical and thermal compatibility with AS7815AT-E1. This ensures direct PCB mounting compatibility without design modifications.

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