Overview
The L78L33ACUTR is a linear, fixed voltage regulator produced by STMicroelectronics. It is part of the L78L series of three-terminal positive regulators, which are known for their internal current limiting and thermal shutdown features, making them essentially indestructible. This device is designed for surface mount technology (SMD) with a package size of SOT89 and operates in temperatures from 0°C to 125°C. It is ideal for applications requiring high-precision voltage regulation for low power circuits.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 3.3 | V |
| Output Current | Up to 100 mA | mA |
| Operating Temperature | 0°C to 125°C | °C |
| Package Type | SOT89 | - |
| 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 |
| Dropout Voltage | 1.7 V | V |
| Output Noise Voltage | 70 µV (B = 10 Hz to 100 kHz, TJ = 25 °C) | µV |
Key Features
- Output current up to 100 mA
- Fixed output voltage of 3.3 V
- Internal current limiting and thermal shutdown
- Short-circuit protection
- No external components required
- Available in ± 4% (A) or ± 8% (C) selection
- High precision voltage regulation for low power circuits
- Low quiescent current and low noise
Applications
The L78L33ACUTR 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
- Use with power pass elements to make high-current voltage regulators
- Replacement for Zener diode/resistor combinations, offering improved performance with lower quiescent current and noise
- Industrial and commercial electronics requiring stable and reliable voltage regulation
Q & A
- What is the output voltage of the L78L33ACUTR?
The output voltage of the L78L33ACUTR is 3.3 V.
- What is the maximum output current of the L78L33ACUTR?
The maximum output current is up to 100 mA.
- What are the operating temperature ranges for the L78L33ACUTR?
The device operates in temperatures from 0°C to 125°C.
- What package type is the L78L33ACUTR available in?
The L78L33ACUTR is available in the SOT89 package type.
- Does the L78L33ACUTR require external components?
No, the L78L33ACUTR does not require external components.
- What are the key protection features of the L78L33ACUTR?
The device features internal current limiting, thermal shutdown, and short-circuit protection.
- How does the L78L33ACUTR compare to Zener diode/resistor combinations?
The L78L33ACUTR offers improved performance with lower quiescent current and lower noise compared to Zener diode/resistor combinations.
- What are some common applications for the L78L33ACUTR?
Common applications include local or on-card regulation, high-current voltage regulators, and industrial/commercial electronics requiring stable voltage regulation.
- What is the quiescent current of the L78L33ACUTR?
The quiescent current is 6 mA at TJ = 25 °C and 5.5 mA at TJ = 125 °C.
- What is the dropout voltage of the L78L33ACUTR?
The dropout voltage is 1.7 V.
