UA78L05CLPE3 Equivalent & Substitute Parts

Part Overview

The UA78L05CLPE3 is a linear voltage regulator IC from Texas Instruments designed to provide a fixed 5V positive output at 100mA in a TO-92-3 through-hole package. This device is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and production requirements. The part delivers regulated power with integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection.

Key Parameters

Parameter	Value
Manufacturer Part Number	UA78L05CLPE3
Manufacturer	Texas Instruments
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	20V
Dropout Voltage (Max)	1.7V @ 40mA
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Operating Temperature	0°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UA78L05CLPE3 is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed 5V output voltage
100mA output current capability
TO-92-3 through-hole package compatibility
Positive output configuration
Operating temperature range compatibility (minimum 0°C ~ 125°C)
ROHS3 compliance

Secondary Compatibility Factors:

Input voltage rating (minimum 20V tolerance)
Dropout voltage performance
Protection features (over-current, over-temperature, short-circuit)
Product status (active or last-time-buy preferred over obsolete)

Substitutes are grouped into two categories: direct pin-compatible replacements maintaining identical package and pinout, and functional equivalents with enhanced specifications or alternative mounting technologies.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Operating Temp	Product Status
UA78L05CLPE3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	TO-92-3	0°C ~ 125°C	Obsolete
LM78L05ACZ/NOPB	Texas Instruments	5V	100mA	35V	—	TO-92-3	0°C ~ 125°C	Active
UA78L05ACLPE3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	TO-92-3	0°C ~ 125°C	Last Time Buy
L78L05ABZ	STMicroelectronics	5V	100mA	30V	—	TO-92-3	-40°C ~ 125°C	Active
L78L05ACZ	STMicroelectronics	5V	100mA	30V	—	TO-92-3	0°C ~ 125°C	Active
L78L05CZ	STMicroelectronics	5V	100mA	30V	—	TO-92-3	0°C ~ 125°C	Not For New Designs
MC78L05ABPG	onsemi	5V	100mA	30V	—	TO-92-3	-40°C ~ 125°C	Active
MC78L05ABPRAG	onsemi	5V	100mA	30V	—	TO-92-3	-40°C ~ 125°C	Active
MC78L05ABPREG	onsemi	5V	100mA	30V	—	TO-92-3	-40°C ~ 125°C	Active
MC78L05ABPRMG	onsemi	5V	100mA	30V	—	TO-92-3	-40°C ~ 125°C	Active
TPS7A2450DBVR	Texas Instruments	5V	200mA	18V	0.25V @ 200mA	SOT-23-5	-40°C ~ 125°C	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Identical Package, Pin-Compatible):

For applications requiring immediate substitution with no PCB redesign, select from active-status parts in TO-92-3 package:

LM78L05ACZ/NOPB (Texas Instruments): Active product status with extended input voltage rating (35V). Maintains identical package and pinout. Recommended for designs requiring continued Texas Instruments supply chain support.
L78L05ACZ (STMicroelectronics): Active product with 30V input rating and extended temperature range (-40°C ~ 125°C). Highest inventory availability (297,853 pcs). Suitable for applications requiring long-term supply stability.
MC78L05ABPREG (onsemi): Active product with 30V input rating and extended temperature range. Highest inventory among onsemi variants (21,400 pcs). Provides alternative supply source.

Tier 2 - Parametric Equivalent (Same Specifications, Different Manufacturer):

UA78L05ACLPE3 (Texas Instruments): Last-time-buy status with identical electrical specifications to the original part. Suitable for near-term production runs where supply is confirmed.
L78L05ABZ (STMicroelectronics): Active status with extended temperature range (-40°C ~ 125°C) and 30V input rating. Appropriate for applications requiring enhanced thermal performance.

Tier 3 - Enhanced Performance Alternative (Different Package):

TPS7A2450DBVR (Texas Instruments): Surface-mount SOT-23-5 package with doubled output current (200mA), superior dropout voltage (0.25V @ 200mA), and active product status. Requires PCB redesign but offers significant performance improvements for new designs.

Compliance Status: All listed substitutes maintain ROHS3 compliance and REACH unaffected status, consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use the TPS7A2450DBVR as a direct replacement for the UA78L05CLPE3?

A: No. The TPS7A2450DBVR uses a SOT-23-5 surface-mount package versus the TO-92-3 through-hole package of the UA78L05CLPE3. PCB redesign is required. However, it provides superior performance with 200mA output current and 0.25V dropout voltage.

Q: What is the difference between L78L05ABZ and L78L05ACZ?

A: Both are STMicroelectronics parts with identical electrical specifications and TO-92-3 packaging. The primary difference is operating temperature range: L78L05ABZ operates -40°C ~ 125°C, while L78L05ACZ operates 0°C ~ 125°C. Select based on your application's minimum operating temperature requirement.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original UA78L05CLPE3 certification.

Q: Which substitute has the best long-term availability?

A: L78L05ACZ (STMicroelectronics) with 297,853 pcs in stock and active product status offers the strongest supply position for long-term production requirements.

Q: Can I use MC78L05ABPG, MC78L05ABPRAG, MC78L05ABPREG, or MC78L05ABPRMG interchangeably?

A: Yes. All four onsemi variants share identical electrical specifications, 5V output, 100mA current, and TO-92-3 packaging. Differences are in packaging format (bulk versus cut tape) and lead forming. Select based on your procurement and assembly requirements.

Q: What is the advantage of the extended input voltage rating on substitute parts?

A: Substitute parts from STMicroelectronics (30V) and LM78L05ACZ/NOPB (35V) provide higher input voltage tolerance compared to the original UA78L05CLPE3 (20V). This allows operation in applications with higher supply voltages or greater voltage transient margins.

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