Overview
The L78L33ACD13TR is a three-terminal positive voltage regulator from STMicroelectronics, part of the L78L series. This regulator is designed to provide a fixed output voltage of 3.3V and is known for its robustness and ease of use. It features internal current limiting and thermal shutdown, making it essentially indestructible when adequate heat-sinking is provided. The L78L33ACD13TR 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 | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | TJ = 25°C | 3.168 | 3.3 | 3.432 | V |
| Output Voltage (VO) | IO = 1 to 40 mA, VI = 5.3 to 20 V | 3.135 | 3.3 | 3.465 | V |
| Line Regulation (∆VO) | VI = 5.4 to 20 V, TJ = 25°C | - | - | 150 mV | mV |
| Load Regulation (∆VO) | IO = 1 to 100 mA, TJ = 25°C | - | - | 60 mV | mV |
| Quiescent Current (Id) | TJ = 25°C | - | 6 mA | - | mA |
| Quiescent Current Change (∆Id) | IO = 1 to 40 mA | - | - | 0.2 mA | mA |
| Output Noise Voltage (eN) | B = 10 Hz to 100 kHz, TJ = 25°C | - | - | 40 µV | µV |
| Supply Voltage Rejection (SVR) | VI = 9 to 20 V, f = 120 Hz, IO = 40 mA, TJ = 25°C | - | - | 39 to 46 dB | dB |
| Dropout Voltage (Vd) | - | - | - | 1.7 V | V |
| Input Voltage (VI) | - | - | - | 30 V (for VO = 3.3 to 9 V) | V |
| Output Current (IO) | - | - | - | 100 mA | mA |
| Operating Junction Temperature (TJ) | - | - | - | 0 to 125°C (AC), -40 to 125°C (AB) | °C |
Key Features
- Fixed output voltage of 3.3V
- Internal current limiting and thermal shutdown for robust operation
- No external components required for operation
- Available in ±4% (A) or ±8% (C) selection
- Low quiescent current and low noise
- Can be used as a replacement for Zener diode/resistor combinations
- Available in TO-92, SO-8, and SOT-89 packages
- High supply voltage rejection and low dropout voltage
Applications
- Local or on-card voltage regulation to eliminate noise and distribution problems
- Use with power pass elements to create high-current voltage regulators
- Replacement for Zener diode/resistor combinations in various circuits
- General-purpose voltage regulation in electronic devices
- Industrial and consumer electronics requiring stable voltage supply
Q & A
- What is the output voltage of the L78L33ACD13TR?
The output voltage of the L78L33ACD13TR is 3.3V.
- What are the key protection features of the L78L33ACD13TR?
The key protection features include internal current limiting and thermal shutdown.
- Do I need external components to use the L78L33ACD13TR?
No, the L78L33ACD13TR does not require any external components for operation.
- What are the available packages for the L78L33ACD13TR?
The L78L33ACD13TR is available in TO-92, SO-8, and SOT-89 packages.
- What is the maximum output current of the L78L33ACD13TR?
The maximum output current is up to 100 mA.
- What is the operating junction temperature range for the L78L33ACD13TR?
The operating junction temperature range is 0 to 125°C for the AC version and -40 to 125°C for the AB version.
- How does the L78L33ACD13TR compare to Zener diode/resistor combinations?
The L78L33ACD13TR offers lower quiescent current and lower noise compared to Zener diode/resistor combinations.
- What is the dropout voltage of the L78L33ACD13TR?
The dropout voltage is 1.7V.
- What is the supply voltage rejection of the L78L33ACD13TR?
The supply voltage rejection is typically between 39 to 46 dB.
- Can the L78L33ACD13TR be used in high-current applications?
Yes, it can be used with power pass elements to create high-current voltage regulators.
