AP78L08VL-A Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The AP78L08VL-A is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed positive 8V output at 100mA. This through-hole component operates across an input voltage range up to 23V and includes integrated over-temperature and short-circuit protection. The part is currently classified as obsolete, making equivalent substitutes necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	8V
Output Current	100mA
Input Voltage (Max)	23V
Quiescent Current	5.5mA
PSRR @ 120Hz	46dB
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Operating Temperature Range	-20°C to 85°C
Protection Features	Over Temperature, Short Circuit

Substitute Part Grouping Explanation

Substitution eligibility for the AP78L08VL-A is determined by the following critical parameters:

Fixed output voltage of 8V
Output current capability of 100mA minimum
TO-92-3 package configuration with through-hole mounting
Positive output configuration
Single regulator topology
RoHS3 compliance and REACH unaffected status

The substitute parts identified maintain these core electrical and mechanical specifications, ensuring functional equivalence in circuit applications. Variations in maximum input voltage, operating temperature range, quiescent current, and protection feature sets are secondary considerations that do not prevent substitution when the primary parameters align.

Parameter Comparison

Parameter	AP78L08VL-A (Diodes)	L78L08ABZ-AP (STMicroelectronics)	UA78L08ACLPRE3 (Texas Instruments)	UA78L08ACLPR (Texas Instruments)
Manufacturer	Diodes Incorporated	STMicroelectronics	Texas Instruments	Texas Instruments
Output Voltage	8V	8V	8V	8V
Output Current	100mA	100mA	100mA	100mA
Input Voltage (Max)	23V	30V	23V	23V
Quiescent Current	5.5mA	5.5mA	Not specified	Not specified
PSRR @ 120Hz	46dB	45dB	46dB	46dB
Package	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Operating Temperature	-20°C to 85°C	-40°C to 125°C	0°C to 125°C	0°C to 125°C
Protection Features	Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Product Status	Obsolete	Active	Last Time Buy	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

L78L08ABZ-AP (STMicroelectronics) is the preferred substitute for new designs and ongoing procurement. This part maintains all critical electrical specifications while offering an extended maximum input voltage rating of 30V, broader operating temperature range (-40°C to 125°C), and active product status ensuring long-term availability. The addition of over-current protection provides enhanced circuit safeguarding compared to the original part.

UA78L08ACLPR (Texas Instruments) serves as the manufacturer-recommended alternative. This part is designated as Last Time Buy status and maintains identical electrical performance to the AP78L08VL-A, including the 23V maximum input voltage and 46dB PSRR specification. It includes comprehensive protection features including reverse polarity protection, making it suitable for applications requiring additional fault tolerance.

UA78L08ACLPRE3 (Texas Instruments) is functionally equivalent to UA78L08ACLPR with identical electrical characteristics and protection features. The Last Time Buy status indicates limited future availability, making it a secondary choice for new designs.

All substitute parts carry RoHS3 compliance and REACH unaffected status, maintaining regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can L78L08ABZ-AP be used as a direct replacement for AP78L08VL-A?

A: Yes. Both parts deliver 8V at 100mA in TO-92-3 packages with through-hole mounting. The STMicroelectronics part offers superior specifications including higher maximum input voltage (30V vs 23V) and extended operating temperature range, making it functionally compatible and technically superior for most applications.

Q: What is the difference between the Texas Instruments UA78L08ACLPR and UA78L08ACLPRE3?

A: Both parts are electrically identical with matching output voltage, current rating, PSRR, and protection features. The primary distinction is product status designation; both are classified as Last Time Buy, indicating limited future availability. Selection between them should be based on current inventory and procurement lead times.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All substitute parts use the TO-92-3 (TO-226AA) package with formed leads and through-hole mounting, ensuring direct PCB compatibility with the original AP78L08VL-A design without layout modifications.

Q: How do the protection features differ among the substitute options?

A: The AP78L08VL-A includes over-temperature and short-circuit protection. L78L08ABZ-AP adds over-current protection. Both Texas Instruments options (UA78L08ACLPR and UA78L08ACLPRE3) provide the most comprehensive protection set, including over-current, over-temperature, reverse-polarity, and short-circuit protection. Enhanced protection features do not create compatibility issues and provide additional circuit safeguarding.

Q: Which substitute is recommended for new product designs?

A: L78L08ABZ-AP is recommended for new designs due to its active product status, extended specifications, and long-term availability assurance. The STMicroelectronics part provides the best balance of performance, reliability, and procurement sustainability.

Q: Do all substitute parts meet the same compliance standards as the original?

A: Yes. All substitute parts are RoHS3 compliant and REACH unaffected, maintaining regulatory alignment with the AP78L08VL-A across all major compliance frameworks.

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