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. 190-5926
Mfr. Part No.ICM7242IPA+
£3.724
Each (In a Pack of 5)
Units
Through Hole Fixed, Programmable PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
RS Stock No. 190-4883
Mfr. Part No.DS1100LZ-50+
£3.606
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. 190-4886
Mfr. Part No.ICM7555ESA+
£1.431
Each (In a Tube of 100)
Units
Surface Mount Astable, RC Monostable SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 190-5939
Mfr. Part No.ICM7555ESA+
£1.784
Each (In a Pack of 10)
Units
Surface Mount Astable, RC Monostable SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 190-5911
Mfr. Part No.DS1100LZ-200+
£4.84
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+
£4.184
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. 188-9296
Mfr. Part No.TS556IDTTR
£0.90
Each
Units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS Stock No. 188-9229
Mfr. Part No.TS556IDTTR
£0.386
Each (On a Reel of 2500)
Units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS Stock No. 190-4882
Mfr. Part No.DS1100LZ-200+
£3.616
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. 190-4885
Mfr. Part No.ICM7242IPA+
£3.165
Each (In a Tube of 50)
Units
Through Hole Fixed, Programmable PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
RS Stock No. 191-4247
Mfr. Part No.ICM7556IPD+
£3.577
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. 190-5952
Mfr. Part No.ICM7556ISD+
£3.204
Each (In a Pack of 5)
Units
Surface Mount Astable, RC Monostable SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
RS Stock No. 698-7127
Mfr. Part No.DS1682S+
£4.38
Each
Units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 190-4888
Mfr. Part No.MAX7375AXR805+T
£0.603
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. 190-4881
Mfr. Part No.DS1100LZ-20+
£3.616
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. 185-1005
Mfr. Part No.BD9555FVM-CGTR
BrandROHM
£0.963
Each (In a Pack of 10)
Units
Surface Mount Control MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA -
RS Stock No. 190-4879
Mfr. Part No.DS1023S-200+
£9.643
Each (In a Tube of 46)
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. 196-8891
Mfr. Part No.ICM7555IBAZ-T
£0.459
Each (In a Pack of 25)
Units
- Standard SOIC 1 8 1MHz - - - - - - - -