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LM340 Series 3 Terminal 12V/2.4A Positive Regulator

View LM340T-12/NOPB: LM340 Series 3 Terminal 12V/2.4A Positive Regulator

LM340T-12/NOPB: LM340 Series 3 Terminal 12V/2.4A Positive Regulator

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Texas Instruments
Jameco Part no. 838815
Manufacturer no. LM340T-12/NOPB
  RoHS compliant
   NCNR (Non-Cancelable, Non Returnable)
Catalog 281 , page 25
Pricing & Availability


# of Unit Price
5+ $1.29
25+ $1.13
50+ $1.02
  • • Order in multiples of 5
  • Availability:Ship  6 Wks ARO 

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LM340 Series 3-Terminal 12V/2.4A Positive Regulator

The LM340 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 by-passing is needed only if the regulator is located far from the filter capacitor of the power supply.

The LM340 series is available in the TO-220 plastic power package


  • Complete specifications at 1A load
  • Output voltage tolerances of ±2% at Tj= 25°C and ±4% over the temperature range (LM340A)
  • Line regulation of 0.01% of VOUT/V of ΔVIN at 1A load (LM340A)
  • Load regulation of 0.3% of VOUT/A (LM340A)
  • Internal thermal overload protection
  • Internal short-circuit current limit
  • Output transistor safe area protection
  • P+ Product Enhancement tested

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  • Specification Value
    Minimum Input Voltage14.6V
    Maximum Input Voltage35V
    Output Voltage12V
    Maximum Output Current2.4A(Typ)
    Maximum Quiescent Current8mA
    Number of Outputs1
    Junction to Ambient54C/W
    Junction to Case4C/W
    Minimum Operating Temperature0°C
    Maximum Operating Temperature125°C
    MountingThrough Hole
    Specification Value
    Product Width4.7mm(Max)
    Product Height8.89mm(Max)
    Product Length10.16mm
    Product TypeLinear Regulator
    Output TypeFixed
    Line Regulation120mV
    Load Regulation120mV
    Typical Dropout Voltage @ Current2V@1A

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