Timer Circuits

Timer circuits are used to control one or more sequences of events within an electronic system. Timer circuits work by changing the circuit from its current state to another in advance following a set parameter.

Where would I use a timer circuit?

You can use timer circuits for a wide range of basic timing functions, like turning a light on for a certain amount of time or on and off repeatedly within a set time to create a flashing light or lighting sequence. Timer circuits can also be used to create musical notes of a particular frequency.

555 timers

The most widespread type of timer circuit is the 555 timer, which is made up of an eight-pin dual in-line package containing 25 transistors, two diodes and 16 resistors. They can be used as either astable or monostable timers:

  • Monostable: Often called a one-shot timer, a monostable timer stays on for a certain length of time and then turns off. The timing process starts when the timer is switched on.
  • Astable: An astable timer is switched on to provide a constant on/off digital output. The timer can be used make an LED flash, and the rate of flashing is determined by a capacitor in the circuit.

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Description Price Mounting Type Timer Type Package Type Number of Internal Timers Pin Count Maximum Input Frequency Minimum Operating Supply Voltage Maximum Operating Supply Voltage Minimum Operating Temperature Maximum Operating Temperature Maximum Quiescent Current Maximum Low Level Output Current Maximum High Level Output Current Maximum Propagation Delay Time @ Maximum CL
RS Stock No. 145-4759
Mfr. Part No.MC1455BDR2G
SGD0.266
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS Stock No. 170-8196
Mfr. Part No.CS82C54-10Z
BrandIntersil
SGD16.741
Each (In a Tube of 37)
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 923-6712
Mfr. Part No.CD4541BE
SGD0.53
Each (In a Tube of 25)
units
Through Hole Programmable PDIP 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns @ 5 V
RS Stock No. 145-0016
Mfr. Part No.CD4536BEE4
SGD0.591
Each (In a Tube of 25)
units
Through Hole Programmable PDIP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns @ 5 V
RS Stock No. 178-5489
Mfr. Part No.TLC555MJG
SGD17.468
Each (In a Tube of 10)
units
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS Stock No. 921-5652
Mfr. Part No.CS82C54-10Z96
SGD18.30
Each
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 709-1999
Mfr. Part No.CD4541BE
SGD0.648
Each (In a Pack of 10)
units
Through Hole Programmable PDIP 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
RS Stock No. 787-8702
Mfr. Part No.MC1455DG
SGD0.632
Each (In a Pack of 14)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 165-4290
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
SGD0.871
Each (On a Reel of 3000)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS Stock No. 910-1733
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
SGD0.996
Each (In a Pack of 10)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS Stock No. 921-5582
Mfr. Part No.CS82C54-10Z
SGD18.10
Each
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 787-8706
Mfr. Part No.MC1455DR2G
SGD0.564
Each (In a Pack of 20)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 162-9390
Mfr. Part No.MC1455DR2G
SGD0.222
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 709-2532
Mfr. Part No.CD4536BEE4
SGD0.731
Each (In a Pack of 10)
units
Through Hole Programmable PDIP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns@ 5 V
RS Stock No. 923-1477
Mfr. Part No.CS82C54-10Z96
SGD12.671
Each (On a Reel of 750)
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 796-8316
Mfr. Part No.TLC555MJG
SGD22.985
Each (In a Pack of 2)
units
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS Stock No. 178-4795
Mfr. Part No.MC14541BDG
SGD0.416
Each (In a Tube of 55)
units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns @ 5 V
RS Stock No. 787-8709
Mfr. Part No.MC1455BDR2G
SGD0.671
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS Stock No. 518-9518
Mfr. Part No.MC14541BDG
SGD0.56
Each
units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns@ 5 V
RS Stock No. 196-2112
Mfr. Part No.TS555IDTTR
SGD1.495
Each (In a Pack of 10)
units
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
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