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. 922-4794
Mfr. Part No.TLC556CDR
£0.448
Each (On a Reel of 2500)
Units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 796-8316
Mfr. Part No.TLC555MJG
£11.565
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. 168-4872
Mfr. Part No.TLC556CD
£1.021
Each (In a Tube of 50)
Units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 178-5489
Mfr. Part No.TLC555MJG
£5.004
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. 787-779
Mfr. Part No.TLC556CD
£1.21
Each
Units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 662-4003
Mfr. Part No.TLC556CDR
£0.99
Each (In a Pack of 5)
Units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 921-5595
Mfr. Part No.CS82C54Z
£8.95
Each
Units
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS Stock No. 165-8649
Mfr. Part No.SA555S-13
£0.10
Each (On a Reel of 2500)
Units
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS Stock No. 921-0745
Mfr. Part No.NA555S-13
£0.287
Each (In a Pack of 30)
Units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
RS Stock No. 165-8349
Mfr. Part No.NA555S-13
£0.103
Each (On a Reel of 2500)
Units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
RS Stock No. 885-5564
Mfr. Part No.SA555S-13
£0.266
Each (In a Pack of 50)
Units
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS Stock No. 121-9741
Mfr. Part No.TPL5000DGST
£0.575
Each (On a Reel of 250)
Units
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
RS Stock No. 825-5340
Mfr. Part No.TPL5000DGST
£0.27
Each (In a Pack of 5)
Units
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
RS Stock No. 162-6928
Mfr. Part No.CD4536BPWR
£0.123
Each (On a Reel of 2000)
Units
Surface Mount Programmable TSSOP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns @ 5 V
RS Stock No. 145-5862
Mfr. Part No.TLC552CD
£0.375
Each (In a Tube of 50)
Units
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 824-6986
Mfr. Part No.LMC555IM/NOPB
£1.186
Each (In a Pack of 5)
Units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 162-8608
Mfr. Part No.LMC555IM/NOPB
£0.978
Each (In a Tube of 95)
Units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 825-3564
Mfr. Part No.TLC552CD
£0.468
Each (In a Pack of 5)
Units
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 662-3996
Mfr. Part No.CD4536BPWR
£0.292
Each (In a Pack of 10)
Units
Surface Mount Programmable TSSOP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns@ 5 V
RS Stock No. 166-2846
Mfr. Part No.FT3001MPX
£0.077
Each (On a Reel of 3000)
Units
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns