National Semiconductor LM340SX-12
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $2.80 | $2.80 |
| 15+ | $0.64 | $9.60 |
| 25+ | $0.63 | $15.75 |
| 50+ | $0.60 | $30.00 |
| 100+ | $0.53 | $53.00 |
| N+ | $0.11 | Price Inquiry |
Request Quote / Inquiry
| Product attributes | Property Value |
| Manufacturer | National Semiconductor |
| Product Series | |
| Packaging | Bulk | |
| Output Configuration | Positive |
| Output Type | Fixed |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 35V |
| Voltage - Output (Min/Fixed) | 12V |
| Voltage - Output (Max) | - |
| Voltage Dropout (Max) | 2V @ 1A |
| Current - Output | 1A |
| Current - Quiescent (Iq) | 8 mA |
| Current - Supply (Max) | - |
| PSRR | 80dB (120Hz) |
| Control Features | - |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | 0°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | TO-263-4, D2PAK (3 Leads + Tab), TO-263AA |
| Supplier Device Package | TO-263 (DDPAK-3) |
The LM340SX-12 is a fixed 12V linear voltage regulator capable of delivering 1A of output current. With a low 2V dropout and excellent 80dB ripple rejection, it ensures a clean and stable supply for a wide range of applications. Housed in a TO-263 package, it offers reliable thermal performance for industrial and consumer designs.
- High Output Current: 1A capability supports power-hungry loads without additional pass transistors.
- Excellent Ripple Rejection: 80dB PSRR at 120Hz minimizes AC line noise for sensitive analog circuits.
- Robust Thermal Package: TO-263 DDPAK design dissipates heat efficiently for reliable operation.
- Simple Fixed Output: No external resistors needed; 12V output is ready to use.
Industrial Control Systems
Provides a stable 12V rail for microcontrollers and analog sensors in factory automation, with 80dB PSRR at 120Hz rejecting line noise.
Telecommunications Equipment
Powers base station control logic and interface circuits requiring a clean 12V supply from a 14-20V intermediate bus.
Test & Measurement Instruments
Delivers low-noise 12V for precision op-amps and ADC reference circuits, ensuring measurement accuracy.
Automotive Electronics
Regulates vehicle battery voltage (12-14V) down to a stable 12V for infotainment and body control modules.
Power Supply Modules
Used as a post-regulator after a DC-DC converter to reduce ripple and provide a clean 12V output for sensitive loads.
LED Lighting Drivers
Provides a constant 12V supply for LED strips and lighting controllers in commercial signage.
- Q: What is the output voltage of the LM340SX-12?
- A: The LM340SX-12 provides a fixed 12V output.
- Q: What is the maximum output current?
- A: It can deliver up to 1A of output current.
- Q: What is the input voltage range?
- A: The input voltage must be at least 2V above the output (14V minimum) due to the 2V dropout at 1A.
- Q: What is the dropout voltage?
- A: The dropout voltage is 2V at 1A load current.
- Q: What is the quiescent current?
- A: The quiescent current is 8 mA.
- Q: What package is available?
- A: It comes in a TO-263 (DDPAK-3) surface-mount package.
LM340SX-12.pdf
- Q: What is the output voltage of the LM340SX-12?
- A: The LM340SX-12 provides a fixed 12V output.
- Q: What is the maximum output current?
- A: It can deliver up to 1A of output current.
- Q: What is the input voltage range?
- A: The input voltage must be at least 2V above the output (14V minimum) due to the 2V dropout at 1A.
- Q: What is the dropout voltage?
- A: The dropout voltage is 2V at 1A load current.
- Q: What is the quiescent current?
- A: The quiescent current is 8 mA.
- Q: What package is available?
- A: It comes in a TO-263 (DDPAK-3) surface-mount package.
