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UA78L05ACLPR

TIUA78L05ACLPR

Texas Instruments
Linear Voltage Regulator IC Positive Fixed 1 Output 100mA TO-92-3
NRND48,079 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The UA78L05ACLPR is a fixed-voltage linear regulator from Texas Instruments designed to deliver a stable 5V output at up to 100mA. This three-terminal regulator features internal current limiting and thermal shutdown, making it essentially indestructible in most circuit environments. Its compact TO-92 package is ideal for space-constrained applications where a simple, low-power regulation stage is required.

Why Choose This Part

This regulator is characterized by its simplicity, requiring no external components for stable operation in many configurations. It includes robust protection features such as over-current and thermal-overload protection, which prevent the device from failing during short circuits or excessive heat. The wide input voltage range up to 20V provides significant headroom for varied power sources.

Applications

Local On-Card Regulation
Eliminating distribution problems associated with single-point regulation by providing localized power control on individual PCBs.
Logic Level Translation
Used as a secondary regulator to provide 5V rails for logic circuits from higher voltage industrial or motor control supplies.
Signal Conditioning Power
Provides clean 5V power for op-amps and sensors in noise-sensitive instrumentation like flow transmitters.
Small Appliance Control
Supplies low-current microcontrollers and user interface LEDs in consumer electronics and building automation modules.

Key Specifications

PSRR 49dB (120Hz)
Output Type Fixed
Mounting Type Through Hole
Package / Case TO-226-3, TO-92-3 (TO-226AA) Formed Leads
Current - Output 100mA
Protection Features Over Current, Over Temperature, Reverse Polarity, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature 0degC ~ 125degC
Voltage - Input (Max) 20V
Voltage Dropout (Max) 1.7V @ 40mA
Supplier Device Package TO-92-3
Voltage - Output (Min/Fixed) 5V

Getting Started

When integrating this regulator, place a 0.33uF capacitor on the input if the device is far from the power source and a 0.1uF capacitor on the output to improve transient response. Ensure the input voltage stays above the 6.7V threshold to account for the 1.7V maximum dropout at 40mA. The TO-92 package is breadboard-compatible, allowing for rapid prototyping of low-current 5V power stages.

UA78L05 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
UA78L05ACLPR (this part) 3-226 48,079
UA78L05ACPK TO-243AA 6,599

Also Consider

LM78L05ACZ TITexas Instruments - A direct industry-standard alternative with similar 100mA output and TO-92 packaging.

Categories

Power Management > LDO Voltage Regulators