Overview
The L78L18ACUTR is a three-terminal positive voltage regulator produced by STMicroelectronics. It is part of the L78L series, which is known for its robust design, featuring internal current limiting and thermal shutdown, making these regulators essentially indestructible. This component is designed to provide a fixed output voltage of 18V and can deliver up to 100 mA of output current, provided an adequate heat sink is used. The L78L series is suitable for a wide range of applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 17.3 - 18.7 | V |
| Output Current | Up to 100 mA | mA |
| Input Voltage Range | 22 to 33 V | V |
| Line Regulation | 320 mV (VI = 22 to 33 V, TJ = 25 °C) | mV |
| Load Regulation | 170 mV (IO = 1 to 100 mA, TJ = 25 °C) | mV |
| Quiescent Current | 6 mA (TJ = 25 °C), 5.5 mA (TJ = 125 °C) | mA |
| Output Noise Voltage | 200 µV (B = 10 Hz to 100 kHz, TJ = 25 °C) | µV |
| Supply Voltage Rejection | 31 to 37 dB (VI = 29 to 33 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C) | dB |
| Dropout Voltage | 1.7 V | V |
| Operating Junction Temperature Range | 0 to 125 °C | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
Key Features
- Internal current limiting and thermal shutdown for enhanced reliability and protection.
- No external components required for operation.
- Low quiescent current and low noise output.
- Available in various packages including TO-92, SO-8, and SOT-89.
- High supply voltage rejection and good line and load regulation.
- Can be used as a replacement for Zener diode/resistor combinations with improved performance.
Applications
- Local or on-card voltage regulation to eliminate noise and distribution problems.
- Use in power supply systems requiring fixed voltage outputs.
- Integration with power pass elements to create high-current voltage regulators.
- Replacement for Zener diode/resistor combinations in various electronic circuits.
- General-purpose voltage regulation in electronic devices and systems.
Q & A
- What is the output voltage of the L78L18ACUTR?
The output voltage of the L78L18ACUTR is 18V, with a range of 17.3V to 18.7V.
- What is the maximum output current of the L78L18ACUTR?
The maximum output current is up to 100 mA, provided an adequate heat sink is used.
- What are the key protection features of the L78L18ACUTR?
The key protection features include internal current limiting and thermal shutdown.
- What is the quiescent current of the L78L18ACUTR?
The quiescent current is 6 mA at 25 °C and 5.5 mA at 125 °C.
- What is the dropout voltage of the L78L18ACUTR?
The dropout voltage is 1.7 V.
- What are the typical applications of the L78L18ACUTR?
Typical applications include local or on-card voltage regulation, power supply systems, and replacement for Zener diode/resistor combinations.
- What packages is the L78L18ACUTR available in?
The L78L18ACUTR is available in TO-92, SO-8, and SOT-89 packages.
- What is the operating junction temperature range of the L78L18ACUTR?
The operating junction temperature range is 0 to 125 °C.
- Does the L78L18ACUTR require external components for operation?
No, the L78L18ACUTR does not require external components for operation.
- What is the storage temperature range of the L78L18ACUTR?
The storage temperature range is -65 to 150 °C.
