Timer Circuits

Timer circuits are used to control sequences of events in electronic systems. They work by changing the circuit from one state to another in advance. 


Applications for timer circuits

You can use timer circuits for basic timing functions, like turning a light on for a certain amount of time or creating a flashing light. They 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. 190-5952
Mfr. Part No.ICM7556ISD+
€3.764
Each (In a Pack of 5)
units
Surface Mount - SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
RS Stock No. 190-4888
Mfr. Part No.MAX7375AXR805+T
€0.718
Each (On a Reel of 2500)
units
Surface Mount - SC-70 - 3 9.99MHz 2.7 V 5.5 V -40 °C +125 °C - - - -
RS Stock No. 540-4520
Mfr. Part No.ICM7555ISA+
€2.47
Each
units
Surface Mount Standard SOIC 1 8 0.5MHz 2 V 18 V -20 °C +85 °C - 3.2mA -2mA -
RS Stock No. 190-5939
Mfr. Part No.ICM7555ESA+
€2.058
Each (In a Pack of 10)
units
Surface Mount - SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 190-4882
Mfr. Part No.DS1100LZ-200+
€4.263
Each (In a Tube of 100)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 190-5911
Mfr. Part No.DS1100LZ-200+
€5.695
Each (In a Pack of 2)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 191-4848
Mfr. Part No.ICM7556IPD+
€4.366
Each (In a Pack of 5)
units
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 190-5908
Mfr. Part No.DS1100LZ-20+
€5.695
Each (In a Pack of 2)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 191-4247
Mfr. Part No.ICM7556IPD+
€3.581
Each (In a Tube of 25)
units
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 732-7664
Mfr. Part No.ICM7555IPA+
€3.19
Each
units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 190-4886
Mfr. Part No.ICM7555ESA+
€1.683
Each (In a Tube of 100)
units
Surface Mount - SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 190-4883
Mfr. Part No.DS1100LZ-50+
€4.252
Each (In a Tube of 100)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 189-8615
Mfr. Part No.DS1682S+
€4.785
Each (In a Pack of 2)
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 190-4881
Mfr. Part No.DS1100LZ-20+
€4.263
Each (In a Tube of 100)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 190-5917
Mfr. Part No.ICM7240IPE+
€7.21
Each (In a Pack of 2)
units
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS Stock No. 190-4885
Mfr. Part No.ICM7242IPA+
€3.74
Each (In a Tube of 50)
units
Through Hole - PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
RS Stock No. 190-5904
Mfr. Part No.DS1023S-200+
€12.89
Each
units
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
RS Stock No. 189-7188
Mfr. Part No.DS1682S+
€3.513
Each (In a Tube of 100)
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 189-8665
Mfr. Part No.ICM7555IPA+
€3.058
Each (In a Pack of 5)
units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 698-7127
Mfr. Part No.DS1682S+
€5.08
Each
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -