Texas Instruments LM2940CS-12/NOPB
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $2.21 | $2.21 |
| 15+ | $2.14 | $32.10 |
| 25+ | $2.10 | $52.50 |
| 50+ | $1.98 | $99.00 |
| 100+ | $1.75 | $175.00 |
| N+ | $0.35 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | |
| Packaging | Tube | |
| Output Configuration | Positive |
| Output Type | Fixed |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 26V |
| Voltage - Output (Min/Fixed) | 12V |
| Voltage - Output (Max) | - |
| Voltage Dropout (Max) | 0.8V @ 1A |
| Current - Output | 1A |
| Current - Quiescent (Iq) | 10 mA |
| Current - Supply (Max) | 15 mA |
| PSRR | 66dB (120Hz) |
| Control Features | - |
| Protection Features | Over Current, Over Temperature, Reverse Polarity, Short Circuit |
| Operating Temperature | 0°C ~ 125°C |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | TO-263-4, D2PAK (3 Leads + Tab), TO-263AA |
| Supplier Device Package | TO-263 (DDPAK-3) |
| ROHS |  |
The LM2940CS-12/NOPB is a fixed 12V low dropout linear regulator from Texas Instruments, capable of delivering up to 1A of output current. Its low dropout voltage of 0.8V at full load allows operation with minimal input-to-output headroom, making it ideal for battery-powered and automotive systems. With a wide input voltage range up to 26V and excellent ripple rejection of 66dB at 120Hz, it ensures clean, stable power for sensitive electronics. The TO-263 package provides efficient heat dissipation for reliable performance in demanding applications.
- High Output Current: Delivers up to 1A, suitable for powering multiple components or higher-power loads.
- Low Dropout Voltage: 0.8V at 1A enables operation with lower input voltages, improving efficiency in battery systems.
- Excellent Ripple Rejection: 66dB PSRR at 120Hz filters AC ripple, providing clean DC power for sensitive analog circuits.
- Wide Input Range: Accepts inputs up to 26V, offering flexibility in various automotive and industrial applications.
Automotive Power Supplies
The 12V fixed output and 1A capability make it suitable for powering sensors, actuators, and microcontroller systems in automotive environments, where a stable 12V rail is required from battery voltages up to 26V.
Industrial Control Systems
With 66dB PSRR at 120Hz, it effectively rejects ripple from rectified AC supplies, ensuring clean power for analog sensors and PLC I/O modules in industrial equipment.
Telecommunication Equipment
Provides a regulated 12V supply for line drivers, interface circuits, and small RF modules, maintaining performance despite varying input voltages from backup batteries.
Audio Equipment
The low output noise and high PSRR make it a good choice for powering audio op-amps and DACs that require a quiet 12V supply to minimize hum and interference.
Battery-Powered Devices
Although quiescent current is 10mA, the low dropout voltage allows efficient use of 12V battery packs, extending runtime by operating closer to the battery's discharge curve.
Test and Measurement Instruments
Provides a stable reference rail for precision circuits, ensuring accurate readings in multimeters, oscilloscopes, and signal generators that need a reliable 12V source.
- Q: What is the output voltage of the LM2940CS-12/NOPB?
- A: The fixed output voltage is 12V, ideal for 12V rail applications.
- Q: What is the maximum output current?
- A: It can deliver up to 1A of continuous output current.
- Q: What is the input voltage range?
- A: The input voltage must be at least 12V plus the dropout voltage (0.8V typical at 1A), so minimum 12.8V; maximum is 26V.
- Q: What is the dropout voltage?
- A: Dropout voltage is typically 0.8V at 1A load, allowing efficient regulation with low headroom.
- Q: What is the quiescent current?
- A: Quiescent current is typically 10mA, which is moderate for a 1A regulator.
- Q: What package is available?
- A: It comes in a TO-263 (DDPAK-3) surface-mount package for good thermal performance.
LM2940CS-12/NOPB.pdf
- Q: What is the output voltage of the LM2940CS-12/NOPB?
- A: The fixed output voltage is 12V, ideal for 12V rail applications.
- Q: What is the maximum output current?
- A: It can deliver up to 1A of continuous output current.
- Q: What is the input voltage range?
- A: The input voltage must be at least 12V plus the dropout voltage (0.8V typical at 1A), so minimum 12.8V; maximum is 26V.
- Q: What is the dropout voltage?
- A: Dropout voltage is typically 0.8V at 1A load, allowing efficient regulation with low headroom.
- Q: What is the quiescent current?
- A: Quiescent current is typically 10mA, which is moderate for a 1A regulator.
- Q: What package is available?
- A: It comes in a TO-263 (DDPAK-3) surface-mount package for good thermal performance.
