Overview
The L7812T is a three-terminal positive voltage regulator IC produced by STMicroelectronics. This device is part of the L78 series, known for its reliability and versatility in various electronic applications. The L7812T provides a fixed output voltage of 12V and is available in several package types, including TO-220, TO-220FP, D²PAK, and DPAK. It is designed to offer local on-card regulation, eliminating the issues associated with single-point regulation. The regulator features internal current limiting, thermal shutdown, and safe area protection, making it highly robust and reliable.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 11.75 to 12.25 | V |
| Output Current | Up to 1.5 A | A |
| Input Voltage (Max) | 35 V | V |
| Dropout Voltage | 2 V | V |
| Output Noise Voltage | 10 µV/VO | µV/VO |
| Output Resistance | 19 mΩ | mΩ |
| Short Circuit Current | 0.2 A | A |
| Short Circuit Peak Current | 2.2 A | A |
| Operating Junction Temperature Range | 0 to 125 °C (L7812AC), -40 to 125 °C (L7812AB) | °C |
| Storage Temperature Range | -65 to 150 °C | °C |
Key Features
- Fixed Output Voltage: The L7812T provides a stable fixed output voltage of 12V.
- High Current Capability: It can deliver up to 1.5 A of output current.
- Thermal Overload Protection: The device includes thermal shutdown to prevent overheating.
- Short Circuit Protection: Internal current limiting and short circuit protection ensure the device's longevity.
- Low Dropout Voltage: A dropout voltage of 2 V at 1 A output current.
- Low Output Noise: The output noise voltage is 10 µV/VO, making it suitable for noise-sensitive applications.
- Compact Packages: Available in TO-220, TO-220FP, D²PAK, and DPAK packages.
Applications
The L7812T is versatile and can be used in a wide range of applications, including:
- Local On-Card Regulation: Eliminates distribution problems associated with single-point regulation.
- Power Supplies: Suitable for use in linear power supplies where a stable 12V output is required.
- Industrial Control Systems: Used in control systems that require reliable and stable voltage regulation.
- Consumer Electronics: Found in various consumer electronic devices needing stable voltage regulation.
- Automotive Systems: Can be used in automotive systems where robust and reliable voltage regulation is essential.
Q & A
- What is the output voltage of the L7812T?
The output voltage of the L7812T is 12V.
- What is the maximum output current of the L7812T?
The L7812T can deliver up to 1.5 A of output current.
- What are the package options for the L7812T?
The L7812T is available in TO-220, TO-220FP, D²PAK, and DPAK packages.
- Does the L7812T have thermal protection?
Yes, the L7812T includes thermal shutdown to prevent overheating.
- What is the dropout voltage of the L7812T?
The dropout voltage of the L7812T is 2 V at 1 A output current.
- Is the L7812T suitable for noise-sensitive applications?
Yes, the L7812T has a low output noise voltage of 10 µV/VO, making it suitable for noise-sensitive applications.
- What is the operating junction temperature range for the L7812T?
The operating junction temperature range for the L7812T is 0 to 125 °C (L7812AC) and -40 to 125 °C (L7812AB).
- Does the L7812T have short circuit protection?
Yes, the L7812T includes internal current limiting and short circuit protection.
- What is the storage temperature range for the L7812T?
The storage temperature range for the L7812T is -65 to 150 °C.
- Can the L7812T be used in automotive systems?
Yes, the L7812T can be used in automotive systems where robust and reliable voltage regulation is essential.
