KA78L08AZTF Equivalent & Substitute Parts

Part Overview

The KA78L08AZTF is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 8V output at 100mA in a TO-92-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across an input voltage range up to 30V with integrated over-temperature and short-circuit protection, suitable for applications requiring stable 8V regulation in compact through-hole configurations.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Output Voltage (Fixed)	8V
Output Current	100mA
Input Voltage (Max)	30V
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Operating Temperature	-40°C ~ 125°C
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility for the KA78L08AZTF is determined by the following critical parameters:

Fixed output voltage of 8V
Output current capability of 100mA minimum
TO-92-3 package compatibility
Through-hole mounting configuration
Input voltage rating of 23V or higher

Parts meeting these criteria are functionally interchangeable at the circuit level. Variations in quiescent current, PSRR, dropout voltage, and operating temperature ranges represent secondary performance differences that do not affect basic substitutability but may influence application suitability based on specific circuit requirements.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	Operating Temperature	Product Status	Protection Features
KA78L08AZTF	onsemi	8V	100mA	30V	5.5 mA	-40°C ~ 125°C	Obsolete	Over Temperature, Short Circuit
MC78L08ACPREG	onsemi	8V	100mA	30V	6 mA	0°C ~ 125°C	Active	Over Current, Over Temperature, Short Circuit
L78L08ABZ-AP	STMicroelectronics	8V	100mA	30V	5.5 mA	-40°C ~ 125°C	Active	Over Current, Over Temperature, Short Circuit
L78L08ABZTR	STMicroelectronics	8V	100mA	30V	5.5 mA	-40°C ~ 125°C	Active	Over Current, Over Temperature, Short Circuit
L78L08ACZTR	STMicroelectronics	8V	100mA	30V	5.5 mA	0°C ~ 125°C	Active	Over Current, Over Temperature, Short Circuit
UA78L08ACLP	Texas Instruments	8V	100mA	23V	Not Specified	0°C ~ 125°C	Obsolete	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L08ACLPE3	Texas Instruments	8V	100mA	23V	Not Specified	0°C ~ 125°C	Obsolete	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L08ACLPR	Texas Instruments	8V	100mA	23V	Not Specified	0°C ~ 125°C	Last Time Buy	Over Current, Over Temperature, Reverse Polarity, Short Circuit
UA78L08ACLPRE3	Texas Instruments	8V	100mA	23V	Not Specified	0°C ~ 125°C	Last Time Buy	Over Current, Over Temperature, Reverse Polarity, Short Circuit

Engineering Selection Recommendations

For new designs and production continuity, MC78L08ACPREG (onsemi) and L78L08ABZTR (STMicroelectronics) are the preferred substitutes. Both parts are in active production status with full RoHS3 compliance and REACH unaffected certification. MC78L08ACPREG offers automotive-grade qualification (AEC-Q100) and extended inventory availability (3020 pcs), making it suitable for high-reliability applications. L78L08ABZTR provides equivalent performance with matching quiescent current and operating temperature range to the original KA78L08AZTF.

The STMicroelectronics L78L08ABZ-AP variant is also actively produced with substantial inventory (28,571 pcs) and identical electrical specifications to L78L08ABZTR, differing only in packaging format.

Texas Instruments UA78L08 series parts (ACLP, ACLPE3, ACLPR, ACLPRE3) remain functionally compatible but carry obsolete or last-time-buy status. These parts feature a reduced maximum input voltage rating of 23V compared to the 30V specification of the primary part and original KA78L08AZTF. Selection of Texas Instruments variants should be limited to applications where the 23V input maximum is sufficient and where existing inventory must be consumed.

Frequently Asked Questions (FAQ)

Q: Can MC78L08ACPREG directly replace KA78L08AZTF in existing circuits?

A: Yes. Both parts deliver 8V at 100mA in TO-92-3 packages with identical pinout and mounting configuration. The MC78L08ACPREG operates across 0°C to 125°C versus the KA78L08AZTF's -40°C to 125°C range. For applications requiring the full -40°C lower temperature limit, L78L08ABZTR or L78L08ABZ-AP are preferred alternatives.

Q: What is the difference between L78L08ABZTR and L78L08ABZ-AP?

A: Both are STMicroelectronics L78L08 regulators with identical electrical specifications and TO-92-3 packaging. The difference lies in packaging format: L78L08ABZTR is supplied in cut tape, while L78L08ABZ-AP is supplied in cut tape as well. Electrical performance and pinout are equivalent.

Q: Why do Texas Instruments UA78L08 parts have a lower maximum input voltage?

A: The UA78L08 series specifies a 23V maximum input voltage, compared to 30V for onsemi and STMicroelectronics variants. This is a design specification difference between manufacturers. Circuits designed for the full 30V input range must use onsemi or STMicroelectronics alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active and last-time-buy substitute parts listed carry RoHS3 compliance certification. The original KA78L08AZTF does not specify RoHS status due to its obsolete classification.

Q: Which substitute offers the best long-term availability?

A: L78L08ABZ-AP (STMicroelectronics) has the highest current inventory at 28,571 pieces and active production status, providing the strongest long-term supply assurance for new designs.

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