UA78L05CLP Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The UA78L05CLP is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed positive 5V output at 100mA. This through-hole TO-92-3 package device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The part delivers regulated 5V output from input voltages up to 20V with integrated protection features including over-current, over-temperature, reverse polarity, and short-circuit protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	20V
Voltage Dropout (Max)	1.7V @ 40mA
Output Configuration	Positive Fixed
Package Type	TO-92-3 (Through Hole)
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the UA78L05CLP is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current Capability: Minimum 100mA required
Package Type: TO-92-3 through-hole mounting for direct PCB compatibility
Input Voltage Rating: Must accommodate up to 20V input
Protection Features: Over-current and over-temperature protection required
Output Configuration: Positive fixed output only

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (Same Package, Same Current Rating): Parts with identical TO-92-3 packaging and 100mA output current capability, maintaining pin-for-pin compatibility.

Category 2 - Enhanced Performance Alternatives (Different Package, Higher Current): Surface-mount alternatives offering improved electrical characteristics such as lower dropout voltage and higher output current, suitable for new designs where package change is acceptable.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Product Status	Operating Temp Range
UA78L05CLP	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	TO-92-3	Obsolete	0°C ~ 125°C
LM78L05ACZ/NOPB	Texas Instruments	5V	100mA	35V	—	TO-92-3	Active	0°C ~ 125°C
UA78L05ACLPE3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	TO-92-3	Last Time Buy	0°C ~ 125°C
L78L05ABZ	STMicroelectronics	5V	100mA	30V	—	TO-92-3	Active	-40°C ~ 125°C
L78L05ACZ	STMicroelectronics	5V	100mA	30V	—	TO-92-3	Active	0°C ~ 125°C
L78L05CZ	STMicroelectronics	5V	100mA	30V	—	TO-92-3	Not For New Designs	0°C ~ 125°C
MC78L05ABPG	onsemi	5V	100mA	30V	—	TO-92-3	Active	-40°C ~ 125°C
MC78L05ABPRAG	onsemi	5V	100mA	30V	—	TO-92-3	Active	-40°C ~ 125°C
MC78L05ABPREG	onsemi	5V	100mA	30V	—	TO-92-3	Active	-40°C ~ 125°C
MC78L05ABPRMG	onsemi	5V	100mA	30V	—	TO-92-3	Active	-40°C ~ 125°C
TPS7A2450DBVR	Texas Instruments	5V	200mA	18V	0.25V @ 200mA	SOT-23-5	Active	-40°C ~ 125°C

Engineering Selection Recommendations

For Direct Replacement (Same Package, Existing PCB):

Select from active-status TO-92-3 parts: LM78L05ACZ/NOPB, L78L05ACZ, MC78L05ABPREG, or MC78L05ABPRMG. These maintain identical through-hole pinout and 100mA current rating. LM78L05ACZ/NOPB and L78L05ACZ support higher input voltages (35V and 30V respectively) compared to the original 20V specification, providing design margin. onsemi parts (MC78L05 series) offer extended temperature range (-40°C to 125°C) versus the original 0°C to 125°C.

For New Designs (Package Change Acceptable):

The TPS7A2450DBVR offers superior electrical performance with 200mA output current, 0.25V dropout voltage, and surface-mount SOT-23-5 packaging. This part requires PCB redesign but delivers enhanced efficiency and lower power dissipation.

Compliance Considerations:

All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory standing. All parts carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can I use L78L05ACZ as a direct replacement for UA78L05CLP?

A: Yes. Both parts deliver 5V fixed output at 100mA in TO-92-3 through-hole packaging with identical pinout. L78L05ACZ is manufactured by STMicroelectronics and carries active product status. The higher input voltage rating (30V vs. 20V) and extended temperature range (-40°C to 125°C) make it suitable for direct substitution.

Q: What is the difference between MC78L05ABPREG and MC78L05ABPRMG?

A: Both are onsemi MC78L05 variants with identical electrical specifications: 5V output, 100mA current, 30V input maximum, TO-92-3 package, and -40°C to 125°C operating range. The suffix difference reflects packaging tape configuration (ABPREG uses standard cut tape; ABPRMG uses cut tape with different reel specifications). Selection depends on procurement and assembly equipment compatibility.

Q: Why is TPS7A2450DBVR listed as a substitute if it uses a different package?

A: TPS7A2450DBVR is classified as an enhanced alternative for new designs. While it requires PCB layout changes due to SOT-23-5 surface-mount packaging, it provides superior performance: 200mA output current (double the original), 0.25V dropout voltage (versus 1.7V), and lower quiescent current (4.5µA). This part is suitable when design flexibility exists.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status, matching the original UA78L05CLP specification.

Q: Can I use parts marked "Not For New Designs" in production?

A: L78L05CZ carries "Not For New Designs" status but remains functionally equivalent to UA78L05CLP. Use is acceptable for legacy system maintenance and repair. For new production, select from active-status alternatives such as L78L05ACZ, LM78L05ACZ/NOPB, or onsemi MC78L05 variants.

Q: What is the minimum input voltage for these regulators?

A: Input specifications provided do not include minimum voltage ratings. Consult manufacturer datasheets for minimum input voltage requirements when designing power supply circuits.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message