Overview
The LM2940CT-5.0 is a high-performance 1A low-dropout linear voltage regulator manufactured by National Semiconductor (now Texas Instruments). This LM2940CT-5.0 provides a fixed 5V output with input voltages from 0V to 26V, delivering stable, regulated power for industrial controls, embedded systems, and laboratory equipment. The part comes in a convenient TO-220 package with three pins and is supplied new in box in quantities of 300 units per package.
Key Features
- Fixed 5V regulated output with up to 1A output current
- Low dropout voltage of 1V at 1A for efficient thermal performance
- Input voltage range: 0V to 26V DC
- Integrated over-temperature, reverse-polarity, and short-circuit protection
- Excellent power supply rejection ratio (PSRR) of 72dB at 120Hz
- TO-220 package rated for 260°C (10 seconds) wave soldering
Technical Specifications
- Output Voltage: 5V (fixed)
- Output Current: 1A maximum
- Input Voltage Range: 0V to 26V DC
- Dropout Voltage: 1V @ 1A
- Operating Temperature Range: 0°C to 125°C (commercial grade)
- Storage Temperature: −65°C to +150°C
- Package: TO-220 (3-pin)
- ESD Susceptibility: 2 kV
- Maximum Junction Temperature: 150°C
- Power Supply Rejection Ratio: 72dB @ 120Hz
Typical Applications
- Industrial control systems and PLC power supplies
- Embedded microcontroller and microprocessor power management
- Telecommunications equipment
- Battery-powered instrumentation
- Post-regulator stages in multi-output power supplies
- Laboratory and test equipment
Compatibility & Replacements
Compatible With
- Any application requiring 5V regulated output at up to 1A
- Breadboard and prototype circuits
- Printed circuit boards with standard TO-220 footprints
- Systems using input voltages between 0V and 26V DC
Replaces / Drop-In Replacement For
- LM2940CT-5.0/NOPB (lead-free variant)
- LM7805 (higher dropout alternative for legacy designs)
- Other pin-compatible 5V regulators in TO-220 package
Works With
- Standard TO-220 footprint PCBs
- Linear and switching power supply circuits
- Circuits requiring reverse-polarity and over-temperature protection
- Applications with tight thermal budgets due to low dropout design
