KA78L09AZTA Equivalent & Substitute Parts

Part Overview

The KA78L09AZTA is a linear voltage regulator IC manufactured by onsemi, delivering a fixed positive 9V output at 100mA in a TO-92-3 package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The KA78L09AZTA provides over-temperature and short-circuit protection across an operating range of -40°C to 125°C, with a maximum input voltage of 30V and quiescent current of 6mA.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	9V
Output Current	100mA
Input Voltage (Max)	30V
Quiescent Current	6mA
PSRR @ 120Hz	44dB
Protection Features	Over Temperature, Short Circuit
Operating Temperature Range	-40°C to 125°C
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the KA78L09AZTA is determined by the following critical parameters: fixed 9V output voltage, 100mA output current capability, TO-92-3 package compatibility, through-hole mounting, and operating temperature range. All substitute parts must maintain these core electrical and mechanical specifications. Secondary parameters including PSRR, quiescent current, input voltage maximum, and protection feature sets are evaluated to identify direct equivalents versus similar alternatives.

Substitute parts are grouped into two categories: direct manufacturer equivalents (matching all critical parameters with active product status) and similar alternatives (meeting core requirements with variations in secondary parameters or product status).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Quiescent Current	PSRR @ 120Hz	Operating Temp Range	Product Status	Package
KA78L09AZTA	onsemi	9V	100mA	30V	6mA	44dB	-40°C to 125°C	Obsolete	TO-92-3
MC78L09ABPRPG	onsemi	9V	100mA	30V	6mA	57dB	-40°C to 125°C	Active	TO-92-3
MC78L09ABPRAG	onsemi	9V	100mA	30V	6mA	57dB	-40°C to 125°C	Active	TO-92-3
MC78L09ACPG	onsemi	9V	100mA	30V	6mA	57dB	0°C to 125°C	Active	TO-92-3
UA78L09ACLPRE3	Texas Instruments	9V	100mA	24V	—	45dB	0°C to 125°C	Active	TO-92-3
L78L09ABZ	STMicroelectronics	9V	100mA	30V	5.5mA	44dB	-40°C to 125°C	Active	TO-92-3
L78L09ACZ-AP	STMicroelectronics	9V	100mA	30V	5.5mA	44dB	0°C to 125°C	Active	TO-92-3
UA78L09ACLP	Texas Instruments	9V	100mA	24V	—	45dB	0°C to 125°C	Last Time Buy	TO-92-3
UA78L09ACLPE3	Texas Instruments	9V	100mA	24V	—	45dB	0°C to 125°C	Last Time Buy	TO-92-3
UA78L09ACLPR	Texas Instruments	9V	100mA	24V	—	45dB	0°C to 125°C	Active	TO-92-3

Engineering Selection Recommendations

For new designs and production applications, MC78L09ABPRPG and MC78L09ABPRAG (onsemi) are the primary recommended substitutes. Both parts maintain full electrical and mechanical compatibility with the KA78L09AZTA while offering active product status, improved PSRR performance (57dB versus 44dB), and RoHS3 compliance. These parts are available in high inventory quantities and support the full -40°C to 125°C operating range.

L78L09ABZ and L78L09ACZ-AP (STMicroelectronics) provide equivalent performance with active status and RoHS3 compliance. The L78L09ABZ supports the extended -40°C to 125°C temperature range matching the original part, while L78L09ACZ-AP operates from 0°C to 125°C.

UA78L09ACLPR (Texas Instruments) is an active substitute with full protection features including reverse polarity protection. However, the maximum input voltage is limited to 24V compared to the 30V specification of the KA78L09AZTA. This part is suitable for applications where input voltage does not exceed 24V.

MC78L09ACPG (onsemi) is available in bulk packaging with active status but operates from 0°C to 125°C, restricting use in applications requiring the full -40°C lower temperature limit.

Parts designated as Last Time Buy (UA78L09ACLP, UA78L09ACLPE3) should be avoided for new designs due to limited future availability.

Frequently Asked Questions (FAQ)

Q: Can MC78L09ABPRPG directly replace KA78L09AZTA in existing designs?

A: Yes. MC78L09ABPRPG maintains identical electrical specifications (9V output, 100mA, 30V input maximum, -40°C to 125°C operating range) and package configuration (TO-92-3). The improved PSRR (57dB versus 44dB) provides better noise rejection without affecting compatibility.

Q: What is the difference between MC78L09ABPRPG and MC78L09ACPG?

A: Both are onsemi MC78L09 variants with identical electrical performance. The primary difference is operating temperature range: MC78L09ABPRPG supports -40°C to 125°C, while MC78L09ACPG operates from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Why do Texas Instruments UA78L09 parts have a 24V maximum input versus 30V for other substitutes?

A: The UA78L09ACLPR, UA78L09ACLP, and UA78L09ACLPE3 are specified with 24V maximum input voltage. These parts are suitable only for applications where input voltage remains below 24V. For designs requiring 30V input capability, select onsemi or STMicroelectronics alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: onsemi and STMicroelectronics substitutes (MC78L09 and L78L09 series) are RoHS3 compliant. Texas Instruments UA78L09 parts are RoHS3 compliant. The original KA78L09AZTA is REACH unaffected but not explicitly RoHS3 certified.

Q: What packaging options are available for substitutes?

A: All substitute parts are available in TO-92-3 through-hole package. Packaging formats vary: MC78L09ABPRPG is supplied in cut tape, MC78L09ACPG in bulk, L78L09ACZ-AP in cut tape, and UA78L09ACLPR in cut tape. Select based on your procurement and assembly requirements.

Q: Can I use L78L09ABZ for applications requiring -40°C operation?

A: Yes. L78L09ABZ supports the full -40°C to 125°C operating range and is electrically equivalent to the KA78L09AZTA. L78L09ACZ-AP operates from 0°C to 125°C and should be used only for applications with 0°C minimum temperature requirements.

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