National Semiconductor LM2940CS-15/NOPB
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $5.04 | $5.04 |
| 15+ | $1.16 | $17.40 |
| 25+ | $1.13 | $28.25 |
| 50+ | $1.07 | $53.50 |
| 100+ | $0.95 | $95.00 |
| N+ | $0.19 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | National Semiconductor |
| Product Series | |
| Packaging | Bulk | |
| Output Configuration | Positive |
| Output Type | Fixed |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 26V |
| Voltage - Output (Min/Fixed) | 15V |
| Voltage - Output (Max) | - |
| Voltage Dropout (Max) | 0.8V @ 1A |
| Current - Output | 1A |
| Current - Quiescent (Iq) | 10 mA |
| Current - Supply (Max) | 15 mA |
| PSRR | 64dB (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-15/NOPB from National Semiconductor is a robust 1A low dropout regulator providing a fixed 15V output. With a dropout voltage of just 0.8V at full load and a wide input range up to 26V, it is engineered for automotive and industrial environments. The TO-263 package ensures excellent thermal performance, while the 64dB PSRR at 120Hz delivers clean power for noise-sensitive applications.
- High Current Capacity: 1A output supports demanding loads like relays and actuators.
- Low Dropout: 0.8V dropout allows operation from a 15.8V input, improving efficiency in battery-backed systems.
- Excellent Ripple Rejection: 64dB PSRR at 120Hz minimizes mains hum in audio and instrumentation.
- Thermally Efficient Package: TO-263 DDPAK-3 dissipates heat effectively for reliable long-term operation.
Automotive Power Systems
With a 15V output and 1A capability, the LM2940CS-15/NOPB is well-suited for automotive sensors, actuators, and infotainment systems that require a stable 15V rail from a 12V battery with load-dump transients.
Industrial Control Equipment
PLC modules, motor controllers, and industrial sensors often need a regulated 15V supply. This regulator's 0.8V dropout ensures reliable operation even when the input sags.
Telecommunication Infrastructure
Base stations and networking equipment use 15V rails for line drivers and interface circuits. The LM2940 provides clean, low-noise power with 64dB PSRR at 120Hz.
Audio Amplifier Pre-Regulation
For analog audio circuits, a stable 15V supply reduces hum and noise. The LM2940's low output impedance and good ripple rejection make it a solid choice.
Test and Measurement Instruments
Benchtop multimeters, oscilloscopes, and signal generators require precise 15V rails. This LDO delivers consistent voltage with minimal drift over temperature.
HVAC Control Boards
Heating, ventilation, and air conditioning controllers use 15V for relay drivers and valve actuators. The TO-263 package handles the thermal demands of continuous operation.
- Q: What is the output voltage of the LM2940CS-15/NOPB?
- A: This LDO provides a fixed 15V output.
- 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 must be at least 0.8V above the output (15.8V) and can handle up to 26V.
- Q: What is the dropout voltage?
- A: The dropout voltage is 0.8V at a 1A load, allowing operation with a 15.8V input minimum.
- Q: What is the quiescent current?
- A: The quiescent current is 10mA, which is typical for higher-current regulators.
- Q: What package is available?
- A: It comes in a TO-263 (DDPAK-3) surface-mount package for efficient heat dissipation.
LM2940CS-15/NOPB.pdf
- Q: What is the output voltage of the LM2940CS-15/NOPB?
- A: This LDO provides a fixed 15V output.
- 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 must be at least 0.8V above the output (15.8V) and can handle up to 26V.
- Q: What is the dropout voltage?
- A: The dropout voltage is 0.8V at a 1A load, allowing operation with a 15.8V input minimum.
- Q: What is the quiescent current?
- A: The quiescent current is 10mA, which is typical for higher-current regulators.
- Q: What package is available?
- A: It comes in a TO-263 (DDPAK-3) surface-mount package for efficient heat dissipation.
