555 Timer
Miscellaneous
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Generic — 555
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Curated by CircuitSim
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Used in 3 public circuits
Details
Manufacturer
Generic
Part number
555
Pins
8
Used in
3 circuits
Added
May 2026
About this component
Generic 8-pin 555 timer macro-model for astable, monostable, pulse generation, and timing applications.
Pins
Pins
8 pins
1
GND
Ground / negative supply reference for the timer.
2
TRIG
Trigger input. Pulling this node below roughly one-third of VCC sets the output high.
3
OUT
Timer output stage. Drives high or low according to the latch state.
4
RESET
Active-low reset input. Hold high for normal timer operation.
5
VCC
Positive supply input for the timer.
6
DISCH
Discharge transistor node, typically connected to the timing resistor/capacitor network.
7
THRESH
Threshold input. Rising above roughly two-thirds of VCC resets the output latch.
8
CTRL
Control voltage input for the internal threshold reference. Commonly bypassed to ground with a small capacitor.
Public circuits using this component
Circuits
3 circuits
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