UA555 Timer
Analog
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Fairchild — UA555
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Curated by CircuitSim
·
Used in 1 public circuit
Details
Manufacturer
Fairchild
Part number
UA555
Pins
8
Used in
1 circuit
Added
May 2026
About this component
UA555 bipolar 555 timer macro-model with the standard 8-pin timer interface for astable, monostable, delay, and pulse-generation circuits.
Pins
Pins
8 pins
1
GND
Ground reference for the UA555 timer macro-model.
2
TRIG
Trigger input; drives the timing latch when pulled below the lower threshold.
3
OUT
Timer output driven by the internal latch and output stage.
4
RESET
Reset input used to force the output low when asserted.
5
CTRL
Control-voltage input for shifting the internal threshold reference.
6
THRESH
Threshold input that compares the timing node against the upper threshold.
7
DISCH
Discharge transistor terminal used to pull the timing capacitor low.
8
VCC
Positive supply for the timer core.
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