Overview
The L78L08ABUTR is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78L series. These regulators are designed to provide stable output voltages with internal current limiting and thermal shutdown, making them highly reliable and essentially indestructible. With adequate heat-sinking, they can deliver up to 100 mA of output current. The L78L series is ideal for fixed voltage regulation in various applications, including local or on-card regulation to eliminate noise and distribution issues associated with single-point regulation. They can also be used in conjunction with power pass elements to create high-current voltage regulators and as replacements for Zener diode/resistor combinations, offering improvements in quiescent current and noise reduction.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 7.68 to 8.32 | V |
| Output Current | Up to 100 | mA |
| Input Voltage Range | 10.5 to 23 | V |
| Line Regulation | 125 to 175 mV | mV |
| Load Regulation | 40 to 80 mV | mV |
| Quiescent Current | 6 mA (at 25°C), 5.5 mA (at 125°C) | mA |
| Dropout Voltage | 1.7 | V |
| Output Noise Voltage | 70 µV (10 Hz to 100 kHz) | µV |
| Supply Voltage Rejection | 37 to 44 dB | dB |
| Operating Junction Temperature Range | -40 to 125°C (AB), 0 to 125°C (AC) | °C |
| Package Type | SOT-89 |
Key Features
- Output current up to 100 mA
- Output voltage of 8 V with ± 4% (A) or ± 8% (C) selection
- Internal current limiting and thermal shutdown for high reliability
- Short-circuit protection
- No external components required
- Low quiescent current and noise
- Available in SOT-89 package
Applications
The L78L08ABUTR is suitable for a wide range of applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems
- Replacement for Zener diode/resistor combinations with lower quiescent current and noise
- Use with power pass elements to create high-current voltage regulators
- Industrial applications requiring stable and reliable voltage regulation
Q & A
- What is the maximum output current of the L78L08ABUTR?
The maximum output current is up to 100 mA.
- What are the available output voltage options for the L78L series?
The L78L series offers output voltages of 3.3, 5, 6, 8, 9, 10, 12, 15, 18, and 24 V.
- What type of protection does the L78L08ABUTR have?
The L78L08ABUTR has internal current limiting and thermal shutdown, as well as short-circuit protection.
- Do I need external components to use the L78L08ABUTR?
No, the L78L08ABUTR does not require any external components.
- What is the typical quiescent current of the L78L08ABUTR?
The typical quiescent current is 6 mA at 25°C and 5.5 mA at 125°C.
- What is the dropout voltage of the L78L08ABUTR?
The dropout voltage is 1.7 V.
- What is the operating junction temperature range for the L78L08ABUTR?
The operating junction temperature range is -40 to 125°C for the AB version and 0 to 125°C for the AC version.
- In what package is the L78L08ABUTR available?
The L78L08ABUTR is available in the SOT-89 package.
- Can the L78L08ABUTR be used in high-current applications?
Yes, it can be used with power pass elements to create high-current voltage regulators.
- What are some common applications for the L78L08ABUTR?
Common applications include local or on-card regulation, replacement for Zener diode/resistor combinations, and industrial applications requiring stable voltage regulation.
