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Product attributes Property Value
Manufacturer Texas Instruments
Product Series
Packaging Cut Tape (CT) | Tape & Reel (TR)
Output Configuration Positive
Output Type Fixed
Number of Regulators 1
Voltage - Input (Max) 20V
Voltage - Output (Min/Fixed) 5V
Voltage - Output (Max) -
Voltage Dropout (Max) 1.7V @ 40mA
Current - Output 100mA
Current - Quiescent (Iq) -
Current - Supply (Max) -
PSRR 49dB (120Hz)
Control Features -
Protection Features Over Current, Over Temperature, Reverse Polarity, Short Circuit
Operating Temperature 0°C ~ 125°C
Grade -
Qualification -
Mounting Type Surface Mount
Package / Case TO-243AA
Supplier Device Package SOT-89-3
ROHS RoHS Compliant - Hazardous Substance Free Electronic Components | HQICKEY

The UA78L05ACPK from Texas Instruments is a fixed 5V linear regulator delivering 100mA. With a dropout of 1.7V at 40mA and PSRR of 49dB at 120Hz, it provides dependable performance for standard 5V applications. The SOT-89-3 package ensures good thermal performance.

  • Standard 5V output compatible with legacy logic and sensors.
  • Proven TI reliability in a compact SOT-89 package.
  • 49dB PSRR at 120Hz reduces power supply hum.
  • 100mA output suitable for many low-power circuits.

Legacy 5V Logic

Provides stable 5V for TTL and CMOS logic ICs in industrial control panels.

Sensor Conditioning

Clean 5V rail for op-amps and ADC references in measurement systems.

Relay Driver Circuits

100mA output can drive small relays, with 5V standard for automotive and industrial.

Power Supply Reference

Used as a post-regulator to generate a precise 5V reference from higher rails.

Consumer Audio

5V supply for audio codecs and DACs, with 49dB ripple rejection.

Test Equipment

Reliable 5V for bench instruments, with SOT-89 package for easy mounting.

Q: What is the output voltage?
A: Fixed 5V.
Q: What is the maximum output current?
A: 100mA.
Q: What is the input voltage range?
A: Not specified in provided data; refer to datasheet.
Q: What is the dropout voltage?
A: 1.7V at 40mA.
Q: What is the PSRR?
A: 49dB at 120Hz.
Q: What package is available?
A: SOT-89-3.
Base Product Number : UA78L05ACPK
100mA 5V Fixed Output LDO Linear Regulator SOT-89 Texas Instruments
Q: What is the output voltage?
A: Fixed 5V.
Q: What is the maximum output current?
A: 100mA.
Q: What is the input voltage range?
A: Not specified in provided data; refer to datasheet.
Q: What is the dropout voltage?
A: 1.7V at 40mA.
Q: What is the PSRR?
A: 49dB at 120Hz.
Q: What package is available?
A: SOT-89-3.