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9 pcs
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9 pcs | On Request | 1 | On Request | On Request | 05+ | On Request | On Request |
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The Texas Instruments LM3940ISX-3.3 is a 1-A low-dropout (LDO) linear voltage regulator. It is specifically designed to deliver a fixed 3.3V output voltage, making it suitable for systems that require both 5V and 3.3V logic levels, with the primary power sourced from a 5V bus.
This regulator features a wide input voltage range from 4.5V to 5.5V and can maintain its 3.3V output regulation even with input voltages as low as 4.5V. It provides a reliable 1A output current and includes built-in protection against excess temperature and short circuits.
The LM3940 is available in multiple package options, including TO-220, TO-263 (DDPAK), and SOT-223. The TO-220 package is often capable of delivering the full 1A load current without requiring an additional heatsink, while the surface-mount TO-263 package minimizes board space and offers excellent power dissipation.
Key electrical characteristics include a typical dropout voltage of 310mV, a quiescent current of 0.11mA, and a PSRR of 32dB at 100 KHz. The operating temperature range is -40°C to 125°C.
The LM3940ISX-3.3 operates with an input voltage range of 4.5V to 5.5V.
This device provides a fixed output voltage of 3.3V.
The regulator can source a maximum output current of 1A.
The LM3940ISX-3.3 is available in TO-263, SOT-223, and TO-220 packages.
The device supports an operating temperature range from -40°C to 125°C.
A minimum load capacitance of 33µF is required for stable operation.