TEXAS INSTRUMENTS LM340 Fixed 5V Linear Voltage Regulator - 5V

The TEXAS INSTRUMENTS LM340T is a robust and reliable 3-terminal positive fixed voltage regulator, engineered to deliver a stable 5V output. It is designed with comprehensive internal protection, including current-limiting, thermal shutdown, and safe-area compensation, which work in tandem to make the device exceptionally resilient and essentially indestructible under normal operating conditions. With adequate heat sinking, this regulator is capable of delivering an output current exceeding 1 ampere, making it suitable for a wide array of power supply applications.

This component is primarily intended as a fixed 5V regulator and is ideal for local, on-card regulation. This approach helps eliminate noise and distribution problems commonly associated with single-point regulation systems, thereby enhancing the overall stability and performance of electronic circuits. Beyond its primary function, the device offers great flexibility; it can be used in conjunction with external components to create adjustable output voltages and currents, providing designers with versatile solutions for custom power requirements.

Significant engineering effort has been invested to ensure the regulator is straightforward to use, minimising the number of external components needed for operation. Its stability is inherent, meaning no output capacitance is required, which simplifies circuit design and reduces board space and cost. The device is housed in a rugged 3-pin TO-220 package, renowned for its ease of mounting and excellent thermal performance when attached to a suitable heatsink.

Key Features & Protections:

• Internal Thermal Overload Protection: Safeguards the device by shutting it down if the junction temperature exceeds safe limits.
• Short-Circuit and Safe Operating Area (SOA) Protection: Protects the output transistor from damage during fault conditions.
• Wide Input Voltage Range: Accepts an input from 7.

Variant Details

• Size: 5V