Texas Instruments LM2940CS-12
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $6.48 | $6.48 |
| 15+ | $2.69 | $40.35 |
| 25+ | $2.63 | $65.75 |
| 50+ | $2.48 | $124.00 |
| 100+ | $2.19 | $219.00 |
| N+ | $0.44 | 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 is a fixed 12V low dropout linear regulator delivering up to 1A of output current. With a typical dropout of 0.8V at full load, it efficiently regulates from inputs as low as 12.8V. The device features a low quiescent current of 10 mA and superior ripple rejection of 66dB at 120Hz, ensuring clean power for sensitive electronics. Packaged in TO-263 (DDPAK-3), it provides excellent thermal performance for continuous operation.
- Robust 1A Output: Supports high-current loads such as motors, displays, and multiple ICs.
- Low Dropout Voltage: 0.8V typical at 1A minimizes headroom requirements and power dissipation.
- High PSRR: 66dB at 120Hz effectively filters mains and switching noise.
- Low Quiescent Current: 10 mA typical reduces standby power, ideal for battery applications.
Automotive Infotainment
Regulate 12V battery power to a stable 12V rail for audio systems and displays. The 1A output supports multiple peripherals, while 66dB PSRR at 120Hz suppresses alternator noise.
Industrial Sensor Interfaces
Provide a clean 12V supply for industrial sensors and transmitters. The low dropout ensures stable operation even when the input supply dips under load.
Networking Equipment
Power Ethernet switches and routers requiring a 12V rail. The high current capability and low quiescent current balance performance with energy efficiency.
Portable Instrumentation
Use with a 13.8V battery to maintain a constant 12V output. The low dropout extends usable battery range, while the TO-263 package aids heat dissipation.
LED Lighting Drivers
Regulate 12V for LED strips or panels. The 1A current capacity can drive multiple LEDs with consistent brightness and minimal ripple.
Medical Monitoring Devices
Supply a stable 12V rail for patient monitoring equipment. The high PSRR ensures reliable operation in electrically noisy hospital environments.
- Q: What is the output voltage of the LM2940CS-12?
- A: The LM2940CS-12 provides a fixed output voltage of 12V.
- 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 a minimum of approximately 12.8V is required.
- Q: What is the dropout voltage?
- A: The dropout voltage is typically 0.8V at a 1A load.
- Q: What is the quiescent current?
- A: The quiescent current is typically 10 mA.
- Q: What package is available?
- A: It is available in the TO-263 (DDPAK-3) surface-mount package.
LM2940CS-12.pdf
- Q: What is the output voltage of the LM2940CS-12?
- A: The LM2940CS-12 provides a fixed output voltage of 12V.
- 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 a minimum of approximately 12.8V is required.
- Q: What is the dropout voltage?
- A: The dropout voltage is typically 0.8V at a 1A load.
- Q: What is the quiescent current?
- A: The quiescent current is typically 10 mA.
- Q: What package is available?
- A: It is available in the TO-263 (DDPAK-3) surface-mount package.
