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Why 555 timer named as 555?

Updated: 8/10/2023
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โˆ™ 12y ago

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A 555 timer basically consists of:

# A voltage divider circuit, # Two comparators, # An SR flip-flop, and # Two (bipolar) transistors: one NPN (discharge) and one PNP (reset),

as can be seen in its block diagram.

The voltage divider consists of three 5Kohm resistors, so that we get (1/3)Vcc and (2/3)Vcc; we use these voltages as references for the comparators.

The three 5K resistors, along with IC's main applications being in timer and multi-vibrator circuits, give it the name 555 timer.

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โˆ™ 13y ago
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โˆ™ 8y ago

because they really liked the number 99, so they decided to name it 555

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โˆ™ 12y ago

It have three 5K internal resistors in it. Hence the name.

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Q: Why 555 timer named as 555?
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