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18 pcs
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18 pcs | On Request | 1 | On Request | On Request | On Request | On Request | On Request |
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| Automotive Grade | |
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The LM3940IS-3.3 from National Semiconductor is a 1-Amp low-dropout (LDO) linear voltage regulator. It is specifically designed to output a stable 3.3V from an input voltage source ranging from 4.5V to 5.5V, making it suitable for systems that utilize both 5V and 3.3V logic levels powered from a 5V bus.
Key electrical specifications include a maximum output current of 1A, a typical dropout voltage of 310mV, and a typical quiescent current of 0.11mA. The regulator offers a typical noise level of 150 µVrms and a PSRR of 32 dB at 100 KHz. It requires a minimum load capacitance of 33 µF for stable operation.
This device features built-in protection against excess temperature and short circuits. It is available in TO-263, SOT-223, and TO-220 packages, with the TO-220 package capable of delivering the full 1A load current without an additional heatsink in most applications. The operating temperature range is -40°C to 125°C.
| Qty | Low | High |
|---|---|---|
| 1+ | $0.28 | $0.28 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The LM3940IS-3.3 provides a fixed output voltage of 3.3V.
The maximum output current is 1A.
The typical dropout voltage is 310mV.
The operating temperature range is -40 to 125°C.
The LM3940IS-3.3 is available in TO-263 (KTT), SOT-223 (DCY), and TO-220 (NDE) packages.
The input voltage range is 4.5V to 5.5V.