Overview
The L78L33CD-TR is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78L series. These regulators are designed to be highly robust, featuring internal current limiting and thermal shutdown, making them essentially indestructible. With adequate heat-sinking, they can deliver up to 100 mA of output current. The L78L series is intended 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 with power pass elements to create high-current voltage regulators, and they offer improvements over Zener diode/resistor combinations with lower quiescent current and noise.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 3.168 - 3.432 | V |
| Output Current | Up to 100 mA | mA |
| Package | SO-8 | - |
| Mounting | SMD | - |
| Line Regulation | 150 mV (VI = 5.4 to 20 V, TJ = 25 °C) | mV |
| Load Regulation | 60 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 | 40 µV (B = 10 Hz to 100 kHz, TJ = 25 °C) | µV |
| Supply Voltage Rejection | 41 - 49 dB (VI = 6.3 to 16.3 V, f = 120 Hz, IO = 40 mA, TJ = 25 °C) | dB |
| Dropout Voltage | 1.7 V | V |
Key Features
- Internal current limiting and thermal shutdown for robust operation
- Output current up to 100 mA with adequate heat-sinking
- Output voltages of 3.3 V with ± 4% (A) or ± 8% (C) selection
- Short-circuit protection and thermal overload protection
- No external components required
- Low quiescent current and low noise
- Available in SO-8 package
Applications
The L78L33CD-TR 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 improved performance
- Use with power pass elements to create high-current voltage regulators
- Industrial applications requiring robust and reliable voltage regulation
Q & A
- What is the output voltage of the L78L33CD-TR?
The output voltage of the L78L33CD-TR is 3.3 V with a tolerance of ± 4% (A) or ± 8% (C).
- What is the maximum output current of the L78L33CD-TR?
The L78L33CD-TR can deliver up to 100 mA of output current with adequate heat-sinking.
- What type of protection does the L78L33CD-TR have?
The L78L33CD-TR features internal current limiting, thermal shutdown, and short-circuit protection.
- Do I need external components to use the L78L33CD-TR?
No, the L78L33CD-TR does not require any external components.
- What is the quiescent current of the L78L33CD-TR?
The quiescent current of the L78L33CD-TR is 6 mA at 25 °C and 5.5 mA at 125 °C.
- What is the dropout voltage of the L78L33CD-TR?
The dropout voltage of the L78L33CD-TR is 1.7 V.
- What package type is the L78L33CD-TR available in?
The L78L33CD-TR is available in the SO-8 package.
- Can the L78L33CD-TR be used in high-current applications?
Yes, the L78L33CD-TR can be used with power pass elements to create high-current voltage regulators.
- What are the typical applications of the L78L33CD-TR?
The L78L33CD-TR is typically used in local or on-card regulation, Zener diode/resistor combination replacements, and industrial applications requiring robust voltage regulation.
- What is the operating temperature range of the L78L33CD-TR?
The operating temperature range of the L78L33CD-TR is from 0 to 125 °C.
