UA78L08ACLP Equivalent & Substitute Parts

Part Overview

The UA78L08ACLP is a linear voltage regulator IC from Texas Instruments designed for positive fixed 8V output at 100mA in a TO-92-3 through-hole package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The UA78L08ACLP provides over-current, over-temperature, reverse polarity, and short-circuit protection with a maximum input voltage of 23V and dropout voltage of 1.7V at 40mA.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	UA78L08ACLP
Product Status	Obsolete
Output Configuration	Positive
Output Type	Fixed
Output Voltage	8V
Output Current	100mA
Input Voltage (Max)	23V
Dropout Voltage (Max)	1.7V @ 40mA
PSRR	46dB (120Hz)
Operating Temperature	0°C ~ 125°C
Package Type	TO-92-3 (Through Hole)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UA78L08ACLP is determined by the following critical parameters:

Output Voltage: 8V fixed output (non-adjustable)
Output Current: 100mA minimum capability
Package Type: TO-92-3 through-hole mounting
Input Voltage Range: Support for up to 23V minimum input
Protection Features: Over-current and over-temperature protection
Product Status: Active or obsolete status (active preferred for new designs)
Compliance: ROHS3 compliance required

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents (Fixed 8V Output, TO-92-3 Package): Parts with identical electrical specifications and package type, suitable for direct replacement in existing designs.

Category 2 - Functional Alternatives (Adjustable Output, Surface Mount): Parts with enhanced features (adjustable output, lower dropout voltage, surface-mount packaging) for new designs where form factor and performance improvements are acceptable.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Product Status	Operating Temp
UA78L08ACLP	Texas Instruments	8V Fixed	100mA	23V	1.7V @ 40mA	TO-92-3	Obsolete	0°C ~ 125°C
UA78L08ACLPE3	Texas Instruments	8V Fixed	100mA	23V	1.7V @ 40mA	TO-92-3	Obsolete	0°C ~ 125°C
L78L08ACZ	STMicroelectronics	8V Fixed	100mA	30V	—	TO-92-3	Active	0°C ~ 125°C
MC78L08ABPG	onsemi	8V Fixed	100mA	30V	—	TO-92-3	Active	-40°C ~ 125°C
MC78L08ABPRAG	onsemi	8V Fixed	100mA	30V	—	TO-92-3	Active	-40°C ~ 125°C
MC78L08ACPG	onsemi	8V Fixed	100mA	30V	—	TO-92-3	Active	0°C ~ 125°C
MC78L08ACPRAG	onsemi	8V Fixed	100mA	30V	—	TO-92-3	Active	0°C ~ 125°C
MC78L08ACPREG	onsemi	8V Fixed	100mA	30V	1.7V @ 40mA	TO-92-3	Active	0°C ~ 125°C
MC78L08ACPRPG	onsemi	8V Fixed	100mA	30V	—	TO-92-3	Active	0°C ~ 125°C
TPS7A1601DGNT	Texas Instruments	1.2V ~ 18.5V Adjustable	100mA	60V	0.5V @ 100mA	8-HVSSOP	Active	-40°C ~ 125°C

Engineering Selection Recommendations

For Direct Replacement (Obsolete Design Continuation)

Select from active TO-92-3 fixed 8V regulators: MC78L08ACPREG, MC78L08ACPRAG, MC78L08ACPG, MC78L08ABPRAG, or MC78L08ABPG. These parts maintain identical output voltage and current specifications with improved product status (active). onsemi parts offer extended temperature range (-40°C ~ 125°C) compared to the original part (0°C ~ 125°C). MC78L08ACPREG includes automotive qualification (AEC-Q100) and dropout voltage specification matching the original part.

For New Designs with Enhanced Performance

The TPS7A1601DGNT from Texas Instruments provides adjustable output voltage (1.2V ~ 18.5V), superior dropout voltage (0.5V @ 100mA), higher input voltage support (60V), and extended temperature range (-40°C ~ 125°C). This part requires surface-mount assembly and circuit redesign for output voltage adjustment but delivers improved power efficiency and flexibility.

Compliance Considerations

All substitute parts maintain ROHS3 compliance and REACH unaffected status. Selection should prioritize active product status for long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can MC78L08ACPREG replace UA78L08ACLP directly?

A: Yes. MC78L08ACPREG maintains identical 8V fixed output, 100mA current rating, and TO-92-3 package. It includes dropout voltage specification (1.7V @ 40mA) matching the original part and adds automotive qualification (AEC-Q100). The part is active status, ensuring supply continuity.

Q: What is the difference between MC78L08ABPG and MC78L08ACPG?

A: Both are onsemi 8V fixed regulators in TO-92-3 packages with 100mA output. MC78L08ABPG operates -40°C ~ 125°C; MC78L08ACPG operates 0°C ~ 125°C. Select based on required operating temperature range.

Q: Why is TPS7A1601DGNT listed as a substitute if it has adjustable output?

A: TPS7A1601DGNT is a functional alternative for new designs. It can be configured for 8V fixed output through external resistors, offers superior performance (0.5V dropout, 60V input), and active product status. It requires surface-mount assembly and circuit modification, making it unsuitable for direct replacement but suitable for redesigned applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original UA78L08ACLP compliance profile.

Q: What packaging options are available for 8V fixed regulators?

A: All parametric equivalents use TO-92-3 through-hole packaging. The TPS7A1601DGNT uses 8-HVSSOP surface-mount packaging. Package selection depends on PCB assembly capability and form factor requirements.

Q: Can I use L78L08ACZ from STMicroelectronics?

A: Yes. L78L08ACZ provides 8V fixed output, 100mA current, and TO-92-3 package. It supports higher input voltage (30V vs. 23V) and is active status. Dropout voltage is not specified in available data. It is suitable for direct replacement where dropout voltage specification is not critical.

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