Overview
The LM340T-12/NOPB is a monolithic 3-terminal positive voltage regulator produced by Texas Instruments. This device is part of the LM340 and LM7805 family, known for their robustness and ease of use. The LM340T-12/NOPB is designed to provide a fixed output voltage of 12V and can deliver up to 1.5A of output current, making it suitable for a wide range of applications. It features internal current-limiting, thermal shutdown, and safe-area compensation, ensuring reliable operation under various conditions.
Key Specifications
| Parameter | Value |
|---|---|
| Output Voltage | 12V ± 2% (LM340A), ± 4% (LM340) |
| Output Current | Up to 1.5A |
| Input Voltage Range | 7.5V to 35V |
| Operating Temperature Range | 0°C to 125°C |
| Package Type | TO-220-3 |
| Line Regulation | 0.01% / V at 1-A Load (LM340A) |
| Load Regulation | 0.3% / A (LM340A) |
| Protection Features | Internal Thermal Overload, Short-Circuit, and SOA Protection |
Key Features
- Fixed output voltage of 12V with ±2% or ±4% tolerance depending on the model (LM340A or LM340)
- Output current up to 1.5A
- Internal current-limiting, thermal shutdown, and safe-area compensation
- No output capacitance required for stability, though it can improve transient response
- Available in space-saving SOT-223 package as well as TO-220-3
- Line regulation of 0.01% / V at 1-A load and load regulation of 0.3% / A (LM340A)
Applications
The LM340T-12/NOPB is intended for use in a variety of applications, including local (on-card) regulation to eliminate noise and distribution problems associated with single-point regulation. It can be used in fixed voltage regulator configurations and, with external components, can also provide adjustable output voltages and currents. Common applications include power supplies, industrial control systems, and electronic devices requiring stable voltage regulation.
Q & A
- What is the output voltage of the LM340T-12/NOPB?
The output voltage is 12V with a tolerance of ±2% for the LM340A model and ±4% for the LM340 model. - What is the maximum output current of the LM340T-12/NOPB?
The maximum output current is up to 1.5A. - What is the operating temperature range of the LM340T-12/NOPB?
The operating temperature range is from 0°C to 125°C. - What type of package does the LM340T-12/NOPB come in?
The device comes in a TO-220-3 package. - Does the LM340T-12/NOPB require output capacitance for stability?
No, output capacitance is not required for stability, although it can improve transient response. - What protection features does the LM340T-12/NOPB have?
The device features internal thermal overload, short-circuit, and safe-area compensation protection. - Can the LM340T-12/NOPB be used for adjustable output voltages?
Yes, with external components, the LM340T-12/NOPB can be used to obtain adjustable output voltages and currents. - What is the input voltage range for the LM340T-12/NOPB?
The input voltage range is from 7.5V to 35V. - Is the LM340T-12/NOPB RoHS compliant?
Yes, the LM340T-12/NOPB is RoHS compliant. - What are some common applications for the LM340T-12/NOPB?
Common applications include power supplies, industrial control systems, and electronic devices requiring stable voltage regulation.
