Overview
The L78M12ACDT-TR is a three-terminal positive linear voltage regulator from STMicroelectronics. It is part of the L78M series, which offers a range of fixed output voltages from 5V to 24V. This specific model provides a regulated output voltage of 12V. The L78M series is known for its reliability and versatility, making it suitable for a wide range of applications that require local on-card regulation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage (VO) | 11.75 - 12.25 | V |
| Output Current (IO) | Up to 500 | mA |
| Input Voltage (VI) for VO = 12V | 14.5 - 27 | V |
| Line Regulation | 100 mV (VI = 14.5 to 30 V, IO = 200 mA) | mV |
| Load Regulation | 240 mV (IO = 5 to 500 mA) | mV |
| Quiescent Current | 6 mA | mA |
| Dropout Voltage | 2 V | V |
| Short Circuit Current | 240 mA (VI = 35 V) | mA |
| Operating Junction Temperature Range | 0 to 125 °C | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
| Thermal Resistance Junction-Case (RthJC) | 5 °C/W (TO-220, TO-220FP) | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | 50 °C/W (TO-220), 60 °C/W (TO-220FP) | °C/W |
Key Features
- Fixed Output Voltage: Provides a stable 12V output voltage.
- High Current Capability: Can supply up to 500 mA of output current.
- Thermal Overload Protection: Internal thermal shutdown to prevent overheating.
- Short Circuit Protection: Protects against short circuits and overcurrent conditions.
- Output Transition SOA Protection: Ensures safe operation during output transitions.
- Low Dropout Voltage: 2V dropout voltage for efficient operation.
- High Accuracy: Output voltage tolerance of 2% for AB and AC versions.
- Wide Operating Temperature Range: Operates from 0 to 125 °C.
Applications
The L78M12ACDT-TR is suitable for various applications requiring local on-card regulation, including:
- Industrial Control Systems: For powering control circuits and sensors.
- Medical Devices: Where stable and reliable voltage regulation is critical.
- Aerospace and Defense: For applications requiring high reliability and thermal stability.
- Consumer Electronics: For powering various components in electronic devices.
- Automotive Systems: For use in automotive electronics where robustness is essential.
Q & A
- What is the output voltage of the L78M12ACDT-TR?
The output voltage is 12V.
- What is the maximum output current of the L78M12ACDT-TR?
The maximum output current is 500 mA.
- What are the input voltage ranges for the L78M12ACDT-TR?
The input voltage range is from 14.5V to 27V for a 12V output.
- Does the L78M12ACDT-TR have thermal protection?
Yes, it has internal thermal shutdown protection.
- What is the dropout voltage of the L78M12ACDT-TR?
The dropout voltage is 2V.
- What is the operating temperature range of the L78M12ACDT-TR?
The operating temperature range is from 0 to 125 °C.
- Does the L78M12ACDT-TR have short circuit protection?
Yes, it has internal short circuit protection.
- What are the typical quiescent current and its change with output current?
The typical quiescent current is 6 mA, and it changes by 0.5 mA over the output current range.
- What is the thermal resistance junction-case (RthJC) for the TO-220 package?
The thermal resistance junction-case (RthJC) is 5 °C/W.
- What are some common applications for the L78M12ACDT-TR?
Common applications include industrial control systems, medical devices, aerospace and defense, consumer electronics, and automotive systems.
