LM555 Highly Stable 555 Timer | TI.com


Highly Stable 555 Timer

Highly Stable 555 Timer - LM555

Recommended alternative parts

  • LMC555  -  Significantly Lower Power 555 Timer


The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200 mA or drive TTL circuits.


  • Direct Replacement for SE555/NE555
  • Timing from Microseconds through Hours
  • Operates in Both Astable and Monostable Modes
  • Adjustable Duty Cycle
  • Output Can Source or Sink 200 mA
  • Output and Supply TTL Compatible
  • Temperature Stability Better than 0.005% per °C
  • Normally On and Normally Off Output
  • Available in 8-pin VSSOP Package

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Parametrics Compare all products in Timers

Frequency (Max) (MHz)
VCC (Min) (V)
VCC (Max) (V)
Iq (Typ) (uA)
Operating temperature range (C)
LM555 LMC555
0.1     3    
4.5     1.5    
16     15    
3000     50    
Catalog     Catalog    
0 to 70     -40 to 125
-40 to 85