National Semiconductor LM2940SX-8.0
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $3.64 | $3.64 |
| 15+ | $0.84 | $12.60 |
| 25+ | $0.82 | $20.50 |
| 50+ | $0.77 | $38.50 |
| 100+ | $0.68 | $68.00 |
| N+ | $0.14 | 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) | 8V |
| Voltage - Output (Max) | - |
| Voltage Dropout (Max) | 1V @ 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 | -40°C ~ 125°C |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | TO-263-4, D2PAK (3 Leads + Tab), TO-263AA |
| Supplier Device Package | DDPAK/TO-263-3 |
The LM2940SX-8.0 is a robust 1A low dropout linear regulator from National Semiconductor, delivering a fixed 8V output. Its low 1V dropout and excellent 66dB ripple rejection ensure clean, stable power for automotive and industrial applications. Housed in a durable DDPAK/TO-263-3 package, it offers reliable performance with built-in thermal and overcurrent protection.
- High Current Capacity: Delivers up to 1A, suitable for powering multiple loads or higher-power sensors.
- Low Dropout Voltage: 1V dropout at full load maximizes efficiency in battery and automotive systems.
- Excellent Ripple Rejection: 66dB PSRR at 120Hz filters AC noise for clean analog supplies.
- Robust Package: DDPAK/TO-263-3 offers superior thermal dissipation for demanding environments.
Automotive Power Supplies
The 8V fixed output and 1A capability make it ideal for powering sensors and small actuators in automotive environments, where its low dropout ensures stable operation during cold-crank conditions.
Industrial Control Systems
With a 66dB PSRR at 120Hz, this regulator effectively filters rectified AC ripple, providing clean power to microcontrollers and analog signal chains in industrial controllers.
Battery-Powered Equipment
The low 1V dropout allows efficient use of battery voltage down to 9V, extending runtime for portable instruments and backup systems.
Post-Regulation for Switching Supplies
Use after a DC-DC converter to reduce output noise and ripple, delivering a stable 8V rail for sensitive RF or audio circuits.
Heating, Ventilation, and Air Conditioning (HVAC) Controllers
Its robust 1A output and thermal protection make it suitable for powering relays and display drivers in HVAC control boards.
- Q: What is the output voltage of the LM2940SX-8.0?
- A: The fixed output voltage is 8.0V.
- 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 8V (typically up to 26V).
- Q: What is the dropout voltage?
- A: The dropout voltage is 1V at a 1A load.
- Q: What is the quiescent current?
- A: The quiescent current is 10 mA.
- Q: What package is available?
- A: It comes in a DDPAK/TO-263-3 surface-mount package.
LM2940SX-8.0.pdf
- Q: What is the output voltage of the LM2940SX-8.0?
- A: The fixed output voltage is 8.0V.
- 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 8V (typically up to 26V).
- Q: What is the dropout voltage?
- A: The dropout voltage is 1V at a 1A load.
- Q: What is the quiescent current?
- A: The quiescent current is 10 mA.
- Q: What package is available?
- A: It comes in a DDPAK/TO-263-3 surface-mount package.
