1.A 5V Fixed Output Linear Regulator / LDO - LM7805


1.A 5V Fixed Output Linear Regulator / LDO



The LM340 and LM78xx 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 1.5-A 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.

LM7805 is also available in a higher accuracy and better performance version (LM340A). Refer to LM340A specifications in the LM340A Electrical Characteristics table.


  • Output Current up to 1.5 A
  • Available in Fixed 5-V, 12-V, and 15-V Options
  • Output Voltage Tolerances of ±2% at TJ = 25°C (LM340A)
  • Line Regulation of 0.01% / V of at 1-A Load (LM340A)
  • Load Regulation of 0.3% / A (LM340A)
  • Internal Thermal Overload, Short-Circuit and SOA Protection
  • Available in Space-Saving SOT-223 Package
  • Output Capacitance Not Required for Stability

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Parametrics Compare all products in Single Channel LDO

Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Fixed Output Options (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Vdo (Typ) (mV)
Accuracy (%)
PSRR @ 100KHz (dB)
Output Capacitor Type
Additional Features
Operating Temperature Range (C)
Approx. Price (US$)
LM7805 LM7812 LM7815
1.5     1.5     1.5    
Fixed Output     Fixed Output     Fixed Output    
7.5     7.5     17.7    
35     35     35    
5     12     15    
5     12     15    
5     12     15    
8     8     8    
2000     2000     2000    
4     4     4    
80     54     70    
Cap Free
Cap Free
Cap Free
Overcurrent Protection
Thermal Shutdown    
Overcurrent Protection
Thermal Shutdown    
Overcurrent Protection
Thermal Shutdown    
Catalog     Catalog     Catalog    
0 to 125     0 to 125     0 to 125    
0.46 | 1ku     0.59 | 1ku     0.59 | 1ku    

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