Series 3-Terminal Positive Regulators

The LM140,LM340A LM340 LM78XXC monolithic 3-terminal positive voltage Regulators employ internal current-limiting, thermal shutdown and safe-area compensation, making them essentially indestructible. If adequate heat sinking is provided, they CAN deliver over 1.0A output current. They are intended as fixed voltage Regulators in a wide range of applications including local (on-card) regulation for elimination of noise and distribution problems associated with single-point regulation. In addition to use as fixed voltage Regulators these devices CAN be used with external components to obtain adjustable output voltages and currents.
Considerable effort was expended to make the entire series of Regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the Regulator is located far from the Filter capacitor of the power supply.
The 5V, 12V, and 15V Regulator options are available in the steel TO-3 power package. The LM140,LM340A LM340 LM78XXC series is available in the TO-220 plastic power package, and the LM340-5.0 is available in the SOT-223 package, as well as the LM340-5.0 and LM340-12 in the surface-mount TO-263 package.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM3404MRX Texas Instruments 1A SWITCHING REGULATOR, PDSO8, PLASTIC, PSOP-8
LM3404MR/NOPB Texas Instruments 1.0A Constant Current Buck Regulator for High Power LED Drivers 8-SO PowerPAD -40 to 125
LM3404MAX/NOPB Texas Instruments 1.0A Constant Current Buck Regulator for High Power LED Drivers 8-SOIC -40 to 125
LM3404MRX/NOPB Texas Instruments 1.0A Constant Current Buck Regulator for High Power LED Drivers 8-SO PowerPAD -40 to 125
LM3404MA/NOPB Texas Instruments 1.0A Constant Current Buck Regulator for High Power LED Drivers 8-SOIC -40 to 125
LM3404MR Texas Instruments 1A SWITCHING REGULATOR, PDSO8, PLASTIC, PSOP-8
LM3404MA Texas Instruments 1A SWITCHING REGULATOR, PDSO8, PLASTIC, SOP-8
LM3404MAX Texas Instruments 1A SWITCHING REGULATOR, PDSO8, PLASTIC, SOP-8
LM3405XMK/NOPB Texas Instruments 1.6MHz 1A Constant Current Buck Regulator for Powering LEDs 6-SOT -40 to 125
LM3405XMKX Texas Instruments 2.8A SWITCHING REGULATOR, 1900kHz SWITCHING FREQ-MAX, PDSO6, TSOP-6
LM340 's PackagesLM340 's pdf datasheet
LM340MP-5.0 SOT-223
LM340MPX-5.0 SOT-223
LM340AT-5.0 TO-220
LM340T-12 TO-220
LM340T-15 TO-220
LM340T-5.0 TO-220
LM7808CT TO-220
LM340AS-5.0 TO-263
LM340S-12 TO-263
LM340S-5.0 TO-263
LM340ASX-5.0 TO-263
LM340SX-12 TO-263
LM340SX-5.0 TO-263
LM340K-15 TO-3
LM340K-12 TO-3
LM340K-5.0 TO-3
LM7808C-MDC
LM7808C-MWC




LM340 Pinout, Pinouts
LM340 pinout,Pin out
This is one package pinout of LM340,If you need more pinouts please download LM340's pdf datasheet.

LM340 Application circuits
LM340 circuits
This is one application circuit of LM340,If you need more circuits,please download LM340's pdf datasheet.


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