KA7815AE Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA7815AE 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 device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The KA7815AE delivers regulated 15V output from input voltages up to 35V with integrated over-temperature and short-circuit protection, suitable for power management applications requiring fixed positive voltage regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	15V
Output Current	1A
Input Voltage (Max)	35V
Voltage Dropout (Max)	2V @ 1A (Typ)
Quiescent Current	6 mA
Package Type	TO-220-3
Mounting Type	Through Hole
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	0°C ~ 125°C

Substitute Part Grouping Explanation

Substitution for the KA7815AE is determined by the following critical parameters: fixed 15V output voltage, 1A output current capability, TO-220-3 package compatibility, maximum 35V input voltage rating, and integrated thermal and short-circuit protection. Parts are grouped into two categories based on these criteria:

Category 1: Direct 1A Output Substitutes — Parts maintaining 1A output current specification with identical 15V fixed output and TO-220-3 package. These include MC7815ABTG, MC7815ACTG, MC7815BTG, MC7815CTG (all onsemi), AS7815AT-E1 (Diodes Incorporated), and L7815 series variants (STMicroelectronics). All maintain the core electrical specifications required for direct replacement.

Category 2: Reduced Output Current Alternatives — Parts with 500mA output current (MC78M15ABTG, MC78M15CTG) provide lower current capacity but maintain 15V output and TO-220-3 package. These are suitable only for applications with reduced current requirements.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temp Range	Product Status	RoHS Status
KA7815AE	onsemi	15V	1A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Obsolete	Not Specified
MC7815ABTG	onsemi	15V	1A	35V	2V @ 1A	6 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
MC7815ACTG	onsemi	15V	1A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Active	ROHS3 Compliant
MC7815BTG	onsemi	15V	1A	35V	2V @ 1A	8 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
MC7815CTG	onsemi	15V	1A	35V	2V @ 1A	6.5 mA	0°C ~ 125°C	Active	ROHS3 Compliant
MC78M15ABTG	onsemi	15V	500mA	35V	Not Specified	Not Specified	-40°C ~ 125°C	Obsolete	ROHS3 Compliant
MC78M15CTG	onsemi	15V	500mA	35V	Not Specified	Not Specified	0°C ~ 125°C	Active	ROHS3 Compliant
AS7815AT-E1	Diodes Incorporated	15V	1A	32V	2V @ 1A	6 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
L7815ABV	STMicroelectronics	15V	1.5A	35V	2V @ 1A	6 mA	-40°C ~ 125°C	Active	ROHS3 Compliant
L7815ACV	STMicroelectronics	15V	1.5A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Active	ROHS3 Compliant
L7815ACV-DG	STMicroelectronics	15V	1.5A	35V	2V @ 1A	6 mA	0°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the KA7815AE with active product status and full RoHS3 compliance, MC7815ACTG and MC7815CTG from onsemi are primary selections, both maintaining identical electrical specifications and operating temperature range matching the original device. MC7815ABTG extends the operating temperature range to -40°C ~ 125°C, suitable for industrial applications requiring wider temperature operation.

For designs requiring extended output current capability beyond 1A, L7815ABV, L7815ACV, and L7815ACV-DG from STMicroelectronics provide 1.5A output current while maintaining all other electrical parameters and RoHS3 compliance. These parts are suitable for applications where additional current headroom is beneficial.

AS7815AT-E1 from Diodes Incorporated provides an alternative 1A solution with active product status and RoHS3 compliance. Note that this part specifies a maximum input voltage of 32V compared to 35V for other alternatives; applications operating near the upper input voltage limit should account for this specification difference.

MC78M15ABTG and MC78M15CTG are suitable only for applications with reduced current requirements of 500mA or less. MC78M15ABTG is obsolete; MC78M15CTG is the active equivalent in this reduced-current category.

Frequently Asked Questions (FAQ)

Q: Can MC7815ABTG directly replace KA7815AE in all applications?

A: MC7815ABTG is electrically compatible with KA7815AE, maintaining identical 15V output, 1A current capacity, 35V maximum input voltage, and TO-220-3 package. The primary difference is an extended operating temperature range (-40°C ~ 125°C versus 0°C ~ 125°C) and active product status with RoHS3 compliance. Direct substitution is valid for applications within the original 0°C ~ 125°C temperature range.

Q: What is the difference between MC7815CTG and MC7815ACTG?

A: Both parts are onsemi 1A, 15V linear regulators in TO-220-3 packages with identical electrical specifications. The primary difference is the operating temperature range: MC7815ACTG operates 0°C ~ 125°C, while MC7815BTG extends to -40°C ~ 125°C. Selection depends on the application's required temperature range.

Q: Can L7815ABV replace KA7815AE?

A: L7815ABV is compatible with KA7815AE for the core 15V output and TO-220-3 package. However, L7815ABV provides 1.5A output current compared to the 1A specification of KA7815AE. This higher current capability does not prevent substitution; the part will operate correctly in 1A applications. L7815ABV is suitable when additional current margin is desired.

Q: Why is AS7815AT-E1 limited to 32V maximum input voltage?

A: AS7815AT-E1 from Diodes Incorporated specifies a 32V maximum input voltage, compared to 35V for most other alternatives. This specification difference reflects the manufacturer's design and testing parameters. For applications operating input voltages between 32V and 35V, alternative parts with 35V ratings should be selected.

Q: Are MC78M15ABTG and MC78M15CTG suitable substitutes?

A: MC78M15ABTG and MC78M15CTG are 500mA regulators, providing half the output current of KA7815AE. These parts are suitable only for applications with maximum current requirements of 500mA or less. For applications requiring the full 1A output current, these parts are not appropriate substitutes.

Q: What is the significance of RoHS3 compliance for these parts?

A: RoHS3 compliance indicates conformance to the Restriction of Hazardous Substances Directive, restricting specific hazardous materials in electrical and electronic equipment. All active substitute parts listed are RoHS3 compliant, meeting current regulatory requirements for new designs and production.

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