UA78L05CLPR Equivalent & Substitute Parts

Part Overview

The UA78L05CLPR is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed positive 5V output at 100mA. This device operates in the Power Management (PMIC) category and is packaged in TO-92-3 through-hole configuration. The part carries a Last Time Buy product status, indicating it is no longer in active production. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 5V regulation.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	UA78L05CLPR
Output Voltage (Fixed)	5V
Output Current	100mA
Input Voltage (Max)	20V
Voltage Dropout (Max)	1.7V @ 40mA
PSRR	49dB (120Hz)
Protection Features	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole
Package	TO-92-3 (TO-226-3)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the UA78L05CLPR is determined by the following critical parameters:

Output Voltage: Must be fixed at 5V
Output Current: Must support 100mA minimum
Input Voltage Range: Maximum input voltage tolerance of 20V or higher
Package Type: TO-92-3 through-hole configuration for direct pin compatibility
Protection Features: Over current, over temperature, and short circuit protection
Operating Temperature Range: 0°C to 125°C minimum
Regulatory Compliance: ROHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories:

Category 1: Manufacturer Recommended Substitutes – Parts recommended by Texas Instruments or alternative manufacturers with identical or superior electrical specifications and active product status.

Category 2: Parametric Equivalents – Parts with matching electrical characteristics but different packaging or product status (Last Time Buy).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Voltage Dropout (Max)	PSRR	Operating Temp	Package	Product Status	Mounting Type
UA78L05CLPR	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	TO-92-3	Last Time Buy	Through Hole
UA78L05ACDR	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	8-SOIC	Active	Surface Mount
LM78L05ACZ/NOPB	Texas Instruments	5V	100mA	35V	—	62dB (120Hz)	0°C ~ 125°C	TO-92-3	Active	Through Hole
UA78L05ACLPM	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	TO-92-3	Last Time Buy	Through Hole
UA78L05ACLPME3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	TO-92-3	Last Time Buy	Through Hole
UA78L05ACLPR	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	TO-92-3	Last Time Buy	Through Hole
UA78L05ACLPRE3	Texas Instruments	5V	100mA	20V	1.7V @ 40mA	49dB (120Hz)	0°C ~ 125°C	TO-92-3	Last Time Buy	Through Hole
L78L05ABZ-AP	STMicroelectronics	5V	100mA	30V	—	49dB (120Hz)	-40°C ~ 125°C	TO-92-3	Active	Through Hole
L78L05ABZ-TR	STMicroelectronics	5V	100mA	30V	—	49dB (120Hz)	-40°C ~ 125°C	TO-92-3	Active	Through Hole
L78L05ACZ-AP	STMicroelectronics	5V	100mA	30V	—	49dB (120Hz)	0°C ~ 125°C	TO-92-3	Active	Through Hole
L78L05ACZTR	STMicroelectronics	5V	100mA	30V	—	49dB (120Hz)	0°C ~ 125°C	TO-92-3	Active	Through Hole

Engineering Selection Recommendations

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

Select LM78L05ACZ/NOPB, L78L05ACZ-AP, or L78L05ACZTR. These parts maintain TO-92-3 through-hole packaging and are in active production status. LM78L05ACZ/NOPB offers superior input voltage tolerance (35V maximum) and improved PSRR (62dB), providing enhanced performance margins. STMicroelectronics L78L05 series parts (L78L05ACZ-AP, L78L05ACZTR) support extended input voltage (30V) and offer active product status with established supply availability.

For Surface-Mount Applications:

Select UA78L05ACDR. This part provides identical electrical specifications to the original UA78L05CLPR while offering surface-mount 8-SOIC packaging and active product status. This option is suitable only for designs that can accommodate package conversion.

For Parametric Equivalence with Through-Hole Packaging:

UA78L05ACLPM, UA78L05ACLPME3, and UA78L05ACLPR are direct parametric equivalents with identical electrical characteristics and TO-92-3 packaging. However, these parts carry Last Time Buy status, indicating limited future availability. Use these only when supply of active alternatives is constrained.

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original UA78L05CLPR.

Frequently Asked Questions (FAQ)

Q: Can I use UA78L05ACDR as a direct replacement for UA78L05CLPR?

A: UA78L05ACDR is electrically equivalent but uses 8-SOIC surface-mount packaging instead of TO-92-3 through-hole. Direct PCB substitution is not possible without redesign. Use only if your application supports surface-mount components.

Q: What is the key difference between LM78L05ACZ/NOPB and UA78L05CLPR?

A: LM78L05ACZ/NOPB supports higher maximum input voltage (35V versus 20V) and provides superior PSRR performance (62dB versus 49dB). Both maintain 5V fixed output at 100mA and TO-92-3 packaging. LM78L05ACZ/NOPB is in active production.

Q: Are STMicroelectronics L78L05 series parts compatible with UA78L05CLPR?

A: Yes. L78L05ABZ-AP, L78L05ABZ-TR, L78L05ACZ-AP, and L78L05ACZTR are pin-compatible TO-92-3 through-hole regulators with identical 5V/100mA output specifications. STMicroelectronics parts support 30V maximum input voltage and are in active production. Operating temperature ranges vary: L78L05ABZ variants support -40°C to 125°C; L78L05ACZ variants support 0°C to 125°C.

Q: Why should I avoid UA78L05ACLPM and UA78L05ACLPME3?

A: These parts carry Last Time Buy status, indicating discontinued production. While parametrically equivalent to UA78L05CLPR, their availability is limited and will eventually cease. Prioritize active-status alternatives for new designs or long-term supply security.

Q: What are the packaging implications for substitution?

A: UA78L05CLPR uses TO-92-3 through-hole packaging with three leads. All recommended through-hole substitutes (LM78L05ACZ/NOPB, L78L05 series) maintain identical pin configuration and footprint. UA78L05ACDR uses 8-SOIC surface-mount packaging and requires PCB redesign.

Q: Do all substitutes provide the same protection features?

A: Most substitutes provide over current, over temperature, and short circuit protection. LM78L05ACZ/NOPB and L78L05 series do not list reverse polarity protection in their specifications. Verify protection feature requirements for your application before selection.

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