UA78L05ACLP Equivalent & Substitute Parts

Part Overview

The UA78L05ACLP is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 100mA in a TO-92-3 through-hole package. This device provides regulated power supply functionality with integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection. The part carries a Last Time Buy product status, indicating it is no longer in active production. Equivalent and substitute parts are necessary to ensure design continuity and long-term supply chain reliability for applications requiring 5V linear regulation.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	20V
Voltage Dropout (Max)	1.7V @ 40mA
PSRR	49dB (120Hz)
Operating Temperature Range	0°C ~ 125°C
Package Type	TO-92-3 (Through Hole)
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the UA78L05ACLP is determined by the following critical parameters:

Fixed 5V output voltage
100mA output current capability
Through-hole TO-92-3 package compatibility
Operating temperature range of 0°C to 125°C minimum
ROHS3 compliance
Protection features: Over-current, over-temperature, and short-circuit protection

Parts are grouped into two categories: MFR Recommended substitutes (active production status) and Parametric Equivalents (matching electrical specifications). Surface-mount alternatives are listed separately due to package incompatibility with through-hole applications.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Package	Operating Temp	Product Status	Inventory
UA78L05ACLP	Texas Instruments	5V	100mA	20V	TO-92-3	0°C ~ 125°C	Last Time Buy	2187 Pcs
LM78L05ACZ/NOPB	Texas Instruments	5V	100mA	35V	TO-92-3	0°C ~ 125°C	Active	5440 Pcs
UA78L05ACLPE3	Texas Instruments	5V	100mA	20V	TO-92-3	0°C ~ 125°C	Last Time Buy	4400 Pcs
L78L05ABZ	STMicroelectronics	5V	100mA	30V	TO-92-3	-40°C ~ 125°C	Active	55100 Pcs
L78L05ACZ	STMicroelectronics	5V	100mA	30V	TO-92-3	0°C ~ 125°C	Active	297853 Pcs
L78L05CZ	STMicroelectronics	5V	100mA	30V	TO-92-3	0°C ~ 125°C	Not For New Designs	3400 Pcs
MC78L05ABPG	onsemi	5V	100mA	30V	TO-92-3	-40°C ~ 125°C	Active	2140 Pcs
MC78L05ACPG	onsemi	5V	100mA	30V	TO-92-3	0°C ~ 125°C	Active	9900 Pcs
NCV78L05ABPG	onsemi	5V	100mA	30V	TO-92-3	-40°C ~ 125°C	Active	718 Pcs

Engineering Selection Recommendations

For through-hole TO-92-3 applications requiring 5V/100mA linear regulation:

Primary Recommendation (Active Production): L78L05ACZ from STMicroelectronics offers the highest inventory availability (297,853 pcs), active product status, and extended input voltage rating (30V maximum). Operating temperature range matches the original specification (0°C ~ 125°C).

Alternative for Extended Temperature Range: L78L05ABZ or MC78L05ABPG provide -40°C to 125°C operating range for applications requiring cold-temperature operation. Both maintain active production status.

Texas Instruments Continuity: LM78L05ACZ/NOPB provides direct Texas Instruments sourcing with active status and higher input voltage tolerance (35V maximum).

Automotive Grade Option: NCV78L05ABPG from onsemi carries AEC-Q100 qualification for automotive applications with extended temperature range (-40°C ~ 125°C).

Avoid for New Designs: L78L05CZ carries Not For New Designs status and should not be selected for new applications despite electrical compatibility.

All recommended substitutes maintain ROHS3 compliance and equivalent protection features (over-current, over-temperature, short-circuit).

Frequently Asked Questions (FAQ)

Q: Can I substitute UA78L05ACLP with a surface-mount alternative? A: No. The UA78L05ACLP uses a through-hole TO-92-3 package. Surface-mount alternatives such as UA78L05ACDR (8-SOIC) require different PCB layout and assembly processes. Package compatibility is mandatory for direct substitution.

Q: What is the difference between L78L05ACZ and L78L05ABZ? A: Both are STMicroelectronics parts with identical electrical specifications (5V output, 100mA, 30V input max). The primary difference is operating temperature range: L78L05ACZ operates 0°C ~ 125°C, while L78L05ABZ operates -40°C ~ 125°C. Select L78L05ABZ for applications requiring cold-temperature performance.

Q: Why does LM78L05ACZ/NOPB have a higher input voltage rating (35V) than the original? A: Higher input voltage ratings provide greater design margin and flexibility. This does not affect compatibility; the device still regulates to 5V output. Applications designed for 20V input maximum will operate identically with this part.

Q: Is NCV78L05ABPG suitable for non-automotive applications? A: Yes. NCV78L05ABPG meets AEC-Q100 automotive qualification standards but is electrically and functionally compatible with general industrial and consumer applications. The automotive qualification represents additional quality assurance.

Q: What inventory considerations should guide my selection? A: L78L05ACZ offers the highest stock availability (297,853 pcs), ensuring long-term supply security. For immediate requirements, MC78L05ACPG (9,900 pcs) and L78L05ABZ (55,100 pcs) provide substantial inventory from active manufacturers.

Q: Can I use these substitutes interchangeably in existing designs? A: Yes, provided the application operates within the specified electrical parameters (5V output, 100mA maximum current, input voltage within device limits). All listed substitutes maintain identical pin configuration and TO-92-3 package dimensions.

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