Overview
The L79L05ACZ-TR is a three-terminal negative voltage regulator from STMicroelectronics. This component is part of the L79L series, which is designed to be highly robust with internal current limiting and thermal shutdown, making them essentially indestructible. With adequate heat-sinking, these regulators can deliver up to 100 mA of output current. They are intended for use as fixed voltage regulators in various applications, including local or on-card regulation to eliminate noise and distribution problems associated with single-point regulation. Additionally, they can be used with power pass elements to create high-current voltage regulators and as replacements for Zener diode/resistor combinations, offering improved output impedance, lower quiescent current, and reduced noise.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | Up to 100 | mA |
| Output Voltage | -5 | V |
| Input Voltage Range | -7 to -30 | V |
| Output Tolerance | +/- 4% | |
| Thermal Overload Protection | Yes | |
| Short-Circuit Protection | Yes | |
| Quiescent Current | 6 mA (typical at 25°C) | |
| Dropout Voltage | 1.7 V | |
| Operating Temperature Range | 0 to 125°C | |
| Package Type | TO-92 |
Key Features
- Output current up to 100 mA
- Fixed output voltage of -5 V
- Thermal overload protection and short-circuit protection
- No external components required
- Low quiescent current and low noise
- Improved output impedance compared to Zener diode/resistor combinations
Applications
The L79L05ACZ-TR is suitable for a wide range of applications, including:
- Local or on-card voltage regulation to eliminate noise and distribution problems
- High-current voltage regulators when used with power pass elements
- Replacement for Zener diode/resistor combinations to improve output impedance and reduce noise
- General-purpose negative voltage regulation in electronic circuits
Q & A
- What is the maximum output current of the L79L05ACZ-TR?
The maximum output current is up to 100 mA.
- What are the available output voltages for the L79L series?
The L79L series offers output voltages of -5, -8, -12, and -15 V.
- Does the L79L05ACZ-TR require external components for operation?
No, the L79L05ACZ-TR does not require any external components for operation.
- What is the operating temperature range of the L79L05ACZ-TR?
The operating temperature range is from 0 to 125°C.
- What type of package is the L79L05ACZ-TR available in?
The L79L05ACZ-TR is available in the TO-92 package.
- Does the L79L05ACZ-TR have thermal overload and short-circuit protection?
Yes, it has both thermal overload and short-circuit protection.
- What is the typical quiescent current of the L79L05ACZ-TR at 25°C?
The typical quiescent current is 6 mA at 25°C.
- What is the dropout voltage of the L79L05ACZ-TR?
The dropout voltage is 1.7 V.
- Can the L79L05ACZ-TR be used as a replacement for Zener diode/resistor combinations?
Yes, it can be used as a replacement, offering improved output impedance and lower noise.
- What is the input voltage range for the L79L05ACZ-TR?
The input voltage range is from -7 to -30 V.
