KA7815E Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The KA7815E 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, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The KA7815E serves applications requiring stable 15V regulated power from input sources up to 35V with integrated over-temperature and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	15V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	8 mA
Operating Temperature Range	-40°C ~ 125°C
Package Type	TO-220-3
Protection Features	Over Temperature, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the KA7815E is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Fixed output voltage of 15V
Output current capability of 1A or greater
Maximum input voltage of 35V or greater
TO-220-3 package configuration
Over-temperature and short-circuit protection

Secondary Compatibility Factors:

Operating temperature range (minimum -40°C to 125°C preferred for full compatibility)
Voltage dropout characteristics (2V @ 1A typical)
Quiescent current specifications
PSRR (Power Supply Rejection Ratio) performance

Substitute parts are grouped into two categories: direct 1A replacements (MC7815 series from onsemi and AS7815AT-E1 from Diodes Incorporated) and higher-current alternatives (L7815 series from STMicroelectronics at 1.5A). Lower-current variants (MC78M15 series at 500mA) are listed for reference but do not meet the 1A output requirement of the original part.

Parameter Comparison

Part Number	Manufacturer	Output Current	Input Voltage (Max)	Quiescent Current	Operating Temp Range	Product Status	PSRR (120Hz)
KA7815E	onsemi	1A	35V	8 mA	-40°C ~ 125°C	Obsolete	70dB
MC7815ABTG	onsemi	1A	35V	6 mA	-40°C ~ 125°C	Active	80dB
MC7815ACTG	onsemi	1A	35V	6 mA	0°C ~ 125°C	Active	80dB
MC7815CTG	onsemi	1A	35V	6.5 mA	0°C ~ 125°C	Active	58dB
NCV7815BTG	onsemi	1A	35V	8 mA	-40°C ~ 125°C	Obsolete	58dB
AS7815AT-E1	Diodes Incorporated	1A	32V	6 mA	-40°C ~ 125°C	Active	58dB
L7815ABV	STMicroelectronics	1.5A	35V	6 mA	-40°C ~ 125°C	Active	58dB
L7815ACV	STMicroelectronics	1.5A	35V	6 mA	0°C ~ 125°C	Active	58dB
L7815ACV-DG	STMicroelectronics	1.5A	35V	6 mA	0°C ~ 125°C	Active	58dB

Engineering Selection Recommendations

Preferred Direct Replacements (1A Output):

MC7815ABTG and MC7815ACTG from onsemi are the primary recommended substitutes. Both are active products with improved quiescent current (6 mA vs. 8 mA) and superior PSRR performance (80dB vs. 70dB). MC7815ABTG maintains the full -40°C to 125°C operating range, matching the original KA7815E specification. MC7815ACTG operates from 0°C to 125°C and is suitable for applications not requiring sub-zero temperature operation.

AS7815AT-E1 from Diodes Incorporated is an active alternative meeting the full temperature range requirement. Input voltage maximum is 32V, which is acceptable for most applications but represents a 3V reduction from the original 35V specification.

Higher-Current Alternatives (1.5A Output):

The L7815 series from STMicroelectronics (L7815ABV, L7815ACV, L7815ACV-DG) provides 1.5A output capability, offering design margin for applications approaching the 1A limit. L7815ABV supports the full -40°C to 125°C temperature range. L7815ACV and L7815ACV-DG operate from 0°C to 125°C. All three variants are active products with RoHS3 compliance.

Compliance Considerations:

All recommended substitutes carry RoHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original KA7815E. MC7815 series parts from onsemi and L7815 series from STMicroelectronics have extensive inventory availability, supporting production continuity.

Frequently Asked Questions (FAQ)

Q: Can MC7815CTG directly replace KA7815E?

A: MC7815CTG is electrically compatible with identical 1A output current, 35V maximum input, and TO-220-3 package. However, it operates only from 0°C to 125°C versus the original -40°C to 125°C range. Selection depends on application temperature requirements. PSRR performance is reduced to 58dB compared to the original 70dB.

Q: What is the difference between MC7815ABTG and MC7815ACTG?

A: Both are 1A regulators with identical electrical performance. MC7815ABTG operates from -40°C to 125°C, while MC7815ACTG operates from 0°C to 125°C. Selection is determined by minimum operating temperature requirements.

Q: Why are L7815 series parts listed as alternatives if they provide 1.5A instead of 1A?

A: L7815 series parts meet all substitution criteria including 15V output, 35V maximum input, and TO-220-3 package. The higher 1.5A current rating provides additional design margin and is fully backward compatible with 1A applications. No circuit modification is required.

Q: Is AS7815AT-E1 suitable for applications requiring 35V input?

A: AS7815AT-E1 has a maximum input voltage of 32V, which is 3V lower than the original KA7815E specification of 35V. It is suitable for applications with input voltages up to 32V. Applications requiring the full 35V input capability should select MC7815 or L7815 series alternatives.

Q: Are all substitute parts RoHS compliant?

A: All recommended substitute parts carry RoHS3 compliance status. The original KA7815E does not specify RoHS compliance, but all active alternatives meet current regulatory requirements.

Q: Can NCV7815BTG be used as a substitute?

A: NCV7815BTG is an automotive-grade part (AEC-Q100 qualified) with identical electrical specifications to KA7815E, including 1A output and -40°C to 125°C operation. However, it is classified as obsolete. Active alternatives such as MC7815ABTG or AS7815AT-E1 are preferred for new designs.

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