KA78L05AD Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA78L05AD is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 5V output at 100mA. This is a positive fixed output regulator in 8-SOIC surface mount packaging. The KA78L05AD is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across output voltage, current capacity, input voltage tolerance, and thermal protection characteristics while meeting modern compliance standards.

Key Parameters

Parameter	Value
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	5V
Voltage - Input (Max)	30V
Current - Output	100mA
Number of Regulators	1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Protection Features	Over Temperature, Short Circuit
Operating Temperature	0°C ~ 125°C

Substitute Part Grouping Explanation

Substitute parts for the KA78L05AD are qualified based on the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 5V fixed
Output current capacity: 100mA minimum
Package type: 8-SOIC surface mount
Input voltage maximum: 30V or greater
Protection features: Over temperature and short circuit protection minimum

Acceptable Variations:

Quiescent current (Iq): 3mA to 6mA range acceptable
PSRR: 49dB to 80dB acceptable
Operating temperature range: 0°C to 125°C or -40°C to 125°C both acceptable
Product status: Active or Last Time Buy acceptable; Obsolete not suitable for new designs

All substitute parts listed maintain 8-SOIC packaging, positive fixed 5V output, 100mA current capacity, and surface mount configuration. Differences in quiescent current, PSRR, and operating temperature ranges reflect manufacturing variations across onsemi, STMicroelectronics, and Texas Instruments product lines while maintaining functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Product Status	Voltage - Input (Max)	Voltage - Output	Current - Output	Current - Quiescent (Iq)	PSRR (120Hz)	Operating Temperature	RoHS Status
KA78L05AD	onsemi	Obsolete	30V	5V	100mA	5.5mA	80dB	0°C ~ 125°C	Not specified
MC78L05ABDR2G	onsemi	Active	30V	5V	100mA	6mA	49dB	-40°C ~ 125°C	ROHS3 Compliant
MC78L05ACDR2G	onsemi	Active	30V	5V	100mA	6mA	49dB	0°C ~ 125°C	ROHS3 Compliant
NCV78L05ABDR2G	onsemi	Active	30V	5V	100mA	6mA	49dB	-40°C ~ 125°C	ROHS3 Compliant
L78L05ABD13TR	STMicroelectronics	Active	30V	5V	100mA	5.5mA	49dB	-40°C ~ 125°C	ROHS3 Compliant
L78L05ACD13TR	STMicroelectronics	Active	30V	5V	100mA	5.5mA	49dB	0°C ~ 125°C	ROHS3 Compliant
L78L05CD13TR	STMicroelectronics	Active	30V	5V	100mA	5.5mA	49dB	0°C ~ 125°C	ROHS3 Compliant
LM78L05ACM/NOPB	Texas Instruments	Active	35V	5V	100mA	3mA	62dB	0°C ~ 125°C	ROHS3 Compliant
UA78L05ACD	Texas Instruments	Active	20V	5V	100mA	Not specified	49dB	0°C ~ 125°C	ROHS3 Compliant
UA78L05ACDR	Texas Instruments	Active	20V	5V	100mA	Not specified	49dB	0°C ~ 125°C	ROHS3 Compliant
UA78L05AID	Texas Instruments	Last Time Buy	20V	5V	100mA	Not specified	49dB	-40°C ~ 125°C	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production (Recommended Primary Choices):

onsemi MC78L05ACDR2G and STMicroelectronics L78L05ACD13TR are the primary recommendations for direct replacement. Both are active products with ROHS3 compliance, matching the original 30V input maximum and 0°C to 125°C operating range. MC78L05ACDR2G maintains onsemi manufacturing continuity, while L78L05ACD13TR provides STMicroelectronics sourcing diversity.

For Extended Temperature Applications (-40°C to 125°C):

onsemi MC78L05ABDR2G, NCV78L05ABDR2G, and STMicroelectronics L78L05ABD13TR support extended temperature operation. NCV78L05ABDR2G includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.

For Superior Performance Characteristics:

Texas Instruments LM78L05ACM/NOPB offers the lowest quiescent current (3mA) and highest PSRR (62dB), with 35V maximum input voltage rating. This part is suitable for applications prioritizing power efficiency and noise rejection.

For Input Voltage Constrained Applications:

Texas Instruments UA78L05 series (UA78L05ACD, UA78L05ACDR, UA78L05AID) are limited to 20V maximum input voltage. These parts are suitable only for applications where input voltage does not exceed 20V and should not be used as direct replacements in circuits designed for 30V input tolerance.

All recommended substitutes maintain ROHS3 compliance and are currently in active production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use UA78L05ACD as a direct replacement for KA78L05AD?

A: UA78L05ACD is electrically compatible for output voltage and current specifications but has a maximum input voltage rating of 20V compared to the KA78L05AD's 30V. Use UA78L05ACD only if your circuit input voltage does not exceed 20V. For circuits designed for 30V input tolerance, use MC78L05ACDR2G or L78L05ACD13TR instead.

Q: What is the difference between MC78L05ABDR2G and MC78L05ACDR2G?

A: Both are onsemi products with identical electrical specifications. The primary difference is operating temperature range: MC78L05ABDR2G operates from -40°C to 125°C, while MC78L05ACDR2G operates from 0°C to 125°C. Select MC78L05ABDR2G for applications requiring extended low-temperature operation.

Q: Is NCV78L05ABDR2G suitable for automotive applications?

A: Yes. NCV78L05ABDR2G carries AEC-Q100 automotive qualification and is graded for automotive use. This part is appropriate for automotive and industrial applications requiring qualified components.

Q: Why does LM78L05ACM/NOPB have a 35V maximum input rating while others are 30V?

A: LM78L05ACM/NOPB is a Texas Instruments design with a higher input voltage rating. This provides additional design margin in applications with higher input voltage transients. It is a valid substitute for KA78L05AD in all applications.

Q: Are all substitute parts available in 8-SOIC packaging?

A: Yes. All substitute parts listed are manufactured in 8-SOIC (0.154", 3.90mm Width) surface mount packaging, maintaining mechanical and electrical compatibility with the original KA78L05AD footprint.

Q: What is the significance of quiescent current differences between parts?

A: Quiescent current (Iq) ranges from 3mA to 6mA across the substitute parts. Lower quiescent current reduces standby power consumption. For battery-powered or low-power applications, LM78L05ACM/NOPB (3mA) is preferred. For general applications, differences are negligible.

Q: Can I substitute KA78L05AD with parts rated for -40°C to 125°C in a 0°C to 125°C application?

A: Yes. Parts rated for -40°C to 125°C are suitable for applications requiring only 0°C to 125°C operation. The extended low-temperature rating provides additional capability without compromise.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message