KA78L08AZTA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The KA78L08AZTA is a linear voltage regulator IC manufactured by onsemi, designed to provide a fixed positive 8V output at 100mA. This through-hole component operates across an input voltage range up to 30V and includes integrated over-temperature and short-circuit protection. The device is packaged in TO-92-3 (TO-226AA) configuration with formed leads.

The KA78L08AZTA is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this regulator topology.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	8V
Output Current	100mA
Input Voltage (Max)	30V
Quiescent Current (Iq)	5.5 mA
PSRR @ 120Hz	70dB
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the KA78L08AZTA is determined by the following critical parameters:

Fixed output voltage of 8V
Output current capability of 100mA minimum
Input voltage tolerance up to 30V
TO-92-3 package configuration with through-hole mounting
Protection against over-temperature and short-circuit conditions
Operating temperature range compatibility

Parts are classified into two categories: direct substitutes (functionally equivalent across all critical parameters) and similar alternatives (meeting core electrical specifications with minor variations in secondary characteristics such as quiescent current or PSRR).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Iq (mA)	PSRR @ 120Hz	Operating Temp	Product Status
KA78L08AZTA	onsemi	8V	100mA	30V	5.5	70dB	-40°C to 125°C	Obsolete
MC78L08ABPRPG	onsemi	8V	100mA	30V	6	57dB	-40°C to 125°C	Active
MC78L08ACPREG	onsemi	8V	100mA	30V	6	57dB	0°C to 125°C	Active
L78L08ABZ-AP	STMicroelectronics	8V	100mA	30V	5.5	45dB	-40°C to 125°C	Active
L78L08ABZTR	STMicroelectronics	8V	100mA	30V	5.5	45dB	-40°C to 125°C	Active
L78L08ACZTR	STMicroelectronics	8V	100mA	30V	5.5	45dB	0°C to 125°C	Active
UA78L08ACLP	Texas Instruments	8V	100mA	23V	Not specified	46dB	0°C to 125°C	Obsolete
UA78L08ACLPE3	Texas Instruments	8V	100mA	23V	Not specified	46dB	0°C to 125°C	Obsolete
UA78L08ACLPR	Texas Instruments	8V	100mA	23V	Not specified	46dB	0°C to 125°C	Last Time Buy
UA78L08ACLPRE3	Texas Instruments	8V	100mA	23V	Not specified	46dB	0°C to 125°C	Last Time Buy

Engineering Selection Recommendations

Primary Substitutes (onsemi): MC78L08ABPRPG and MC78L08ACPREG are active onsemi alternatives with identical output voltage and current specifications. MC78L08ABPRPG maintains the full -40°C to 125°C operating range. MC78L08ACPREG includes automotive-grade qualification (AEC-Q100) and RoHS3 compliance, suitable for applications requiring enhanced reliability standards.

Secondary Substitutes (STMicroelectronics): L78L08ABZTR and L78L08ABZ-AP are active STMicroelectronics equivalents meeting all core electrical parameters. Both maintain the -40°C to 125°C operating range and RoHS3 compliance. L78L08ACZTR operates from 0°C to 125°C and is suitable for commercial-grade applications.

Legacy Alternatives (Texas Instruments): UA78L08ACLPR and UA78L08ACLPRE3 are Last Time Buy status parts with reduced input voltage tolerance (23V maximum versus 30V). UA78L08ACLP and UA78L08ACLPE3 are obsolete. These parts include reverse polarity protection and are suitable only for applications with input voltages not exceeding 23V.

Frequently Asked Questions (FAQ)

Q: Can MC78L08ABPRPG directly replace KA78L08AZTA? A: Yes. Both parts deliver 8V at 100mA with identical input voltage tolerance (30V maximum) and matching operating temperature range (-40°C to 125°C). Quiescent current differs by 0.5mA (6mA versus 5.5mA), which is negligible for most applications.

Q: What is the difference between MC78L08ABPRPG and MC78L08ACPREG? A: MC78L08ACPREG includes automotive-grade qualification (AEC-Q100) and operates from 0°C to 125°C, making it suitable for automotive and industrial applications. MC78L08ABPRPG maintains the extended -40°C to 125°C range for general-purpose use.

Q: Are STMicroelectronics L78L08 parts compatible? A: L78L08ABZTR and L78L08ABZ-AP are fully compatible with KA78L08AZTA for applications requiring input voltages up to 30V and operating temperatures from -40°C to 125°C. PSRR is lower (45dB versus 70dB), which may affect noise-sensitive applications.

Q: Can Texas Instruments UA78L08 parts be used as substitutes? A: UA78L08ACLPR and UA78L08ACLPRE3 are compatible only for applications with input voltages not exceeding 23V. Both are Last Time Buy status. UA78L08ACLP and UA78L08ACLPE3 are obsolete and should not be selected for new designs.

Q: What packaging considerations apply to these substitutes? A: All listed substitutes use TO-92-3 (TO-226AA) through-hole packaging with formed leads, ensuring direct mechanical and electrical compatibility with KA78L08AZTA footprints.

Q: Which substitute offers the best compliance profile? A: MC78L08ACPREG provides RoHS3 compliance and AEC-Q100 automotive qualification. L78L08ABZTR and L78L08ABZ-AP offer RoHS3 compliance with active product status and full inventory availability.

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