UA78L12ACLP Linear Voltage Regulator 12V 100mA Equivalent & Substitute Parts

Part Overview

The UA78L12ACLP is a linear voltage regulator IC from Texas Instruments designed to provide a fixed positive 12V output at 100mA. This through-hole TO-92-3 packaged component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The device features integrated protection against overcurrent, overtemperature, reverse polarity, and short circuit conditions, making it suitable for general-purpose power management applications requiring fixed 12V regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	12V
Output Current	100mA
Input Voltage (Max)	27V
Voltage Dropout (Max)	1.7V @ 40mA
Output Configuration	Positive Fixed
Package Type	TO-92-3 (Through Hole)
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UA78L12ACLP is determined by the following critical parameters: fixed 12V output voltage, 100mA output current capability, positive output configuration, and protection feature set. Substitute parts must maintain these core electrical specifications while meeting the same regulatory compliance standards (ROHS3, REACH Unaffected, EAR99).

Substitutes are grouped into two categories:

Parametric Equivalents (Same Package, Same Electrical Characteristics): Parts that maintain identical electrical performance and the same TO-92-3 through-hole package, suitable for direct board-level replacement without layout modification.

Manufacturer Recommended Alternatives (Different Package or Enhanced Specifications): Parts offering improved performance characteristics, different mounting technologies, or extended temperature ranges while maintaining the core 12V/100mA regulation function.

Parameter Comparison

Part Number	Manufacturer	Status	Package	Input Voltage (Max)	Output Current	Dropout Voltage	Operating Temp	Protection Features	Mounting Type
UA78L12ACLP	Texas Instruments	Obsolete	TO-92-3	27V	100mA	1.7V @ 40mA	0°C ~ 125°C	OCP, OTP, Reverse Polarity, SCP	Through Hole
UA78L12ACLPE3	Texas Instruments	Obsolete	TO-92-3	27V	100mA	1.7V @ 40mA	0°C ~ 125°C	OCP, OTP, Reverse Polarity, SCP	Through Hole
LM78L12ACZ/NOPB	Texas Instruments	Active	TO-92-3	35V	100mA	Not Specified	0°C ~ 125°C	OTP, SCP	Through Hole
L78L12ACZ	STMicroelectronics	Active	TO-92-3	35V	100mA	Not Specified	0°C ~ 125°C	OCP, OTP, SCP	Through Hole
L78L12ABZ	STMicroelectronics	Active	TO-92-3	35V	100mA	Not Specified	-40°C ~ 125°C	OCP, OTP, SCP	Through Hole
MC78L12ACPG	onsemi	Active	TO-92-3	35V	100mA	Not Specified	0°C ~ 125°C	OTP, SCP	Through Hole
MC78L12ABPG	onsemi	Active	TO-92-3	35V	100mA	Not Specified	-40°C ~ 125°C	OTP, SCP	Through Hole
NCV78L12ABPG	onsemi	Active	TO-92-3	35V	100mA	Not Specified	-40°C ~ 125°C	OTP, SCP	Through Hole
TLV76012DBZT	Texas Instruments	Active	SOT-23-3	30V	100mA	1.1V @ 100mA	-40°C ~ 125°C	OTP	Surface Mount

Engineering Selection Recommendations

For Direct Board Replacement (Through-Hole TO-92-3):

Select L78L12ACZ or L78L12ABZ from STMicroelectronics for active production designs. Both maintain the TO-92-3 package and 100mA output current specification. L78L12ABZ offers extended temperature range (-40°C to 125°C) compared to the original UA78L12ACLP (0°C to 125°C), providing broader operational capability. Both are ROHS3 compliant and actively manufactured with high inventory availability.

MC78L12ACPG or MC78L12ABPG from onsemi provide equivalent functionality with the same package footprint. MC78L12ABPG extends the operating temperature to -40°C to 125°C. Both are ROHS3 compliant and actively produced.

For Surface Mount Conversion:

TLV76012DBZT from Texas Instruments offers a modern SOT-23-3 surface mount alternative with improved dropout voltage (1.1V @ 100mA versus 1.7V @ 40mA) and extended temperature range (-40°C to 125°C). This option requires PCB layout modification but provides superior thermal performance and smaller footprint for new designs.

Obsolete Part Continuity:

UA78L12ACLPE3 is a parametric equivalent to the original UA78L12ACLP, maintaining identical electrical specifications and TO-92-3 packaging. However, both are classified as obsolete. For production continuity, transition to active alternatives listed above.

Frequently Asked Questions (FAQ)

Q: Can I directly replace UA78L12ACLP with L78L12ACZ in an existing circuit?

A: Yes. Both parts maintain the same TO-92-3 package, 12V fixed output, and 100mA current rating. L78L12ACZ is actively manufactured and ROHS3 compliant. No circuit modification is required for pin-compatible replacement.

Q: What is the difference between L78L12ACZ and L78L12ABZ?

A: Both are STMicroelectronics parts with identical electrical specifications and TO-92-3 packaging. The primary difference is operating temperature range: L78L12ACZ operates 0°C to 125°C, while L78L12ABZ operates -40°C to 125°C. Select L78L12ABZ for applications requiring extended low-temperature operation.

Q: Why would I choose TLV76012DBZT over through-hole alternatives?

A: TLV76012DBZT is a surface mount SOT-23-3 device offering improved dropout voltage (1.1V @ 100mA) and extended temperature range (-40°C to 125°C). This option is suitable for new PCB designs prioritizing compact form factor and thermal efficiency. Existing through-hole designs would require layout redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What protection features should I verify when selecting a substitute?

A: The original UA78L12ACLP includes overcurrent, overtemperature, reverse polarity, and short circuit protection. Most active substitutes provide overtemperature and short circuit protection. If reverse polarity protection is critical for your application, verify the specific part datasheet, as not all substitutes include this feature.

Q: Can I use MC78L12ABPG or MC78L12ACPG interchangeably?

A: Yes, both are onsemi parts with identical electrical specifications and TO-92-3 packaging. MC78L12ABPG operates -40°C to 125°C, while MC78L12ACPG operates 0°C to 125°C. Select based on your application's temperature requirements.

Q: Is NCV78L12ABPG suitable for automotive applications?

A: NCV78L12ABPG is qualified to AEC-Q100 automotive standards with -40°C to 125°C operating range. It is suitable for automotive-grade applications requiring this certification level.

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