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. 121-9248
Mfr. Part No.SE555P
kr 4,077
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 709-2110
Mfr. Part No.SE555P
kr 4,762
Each (In a Pack of 5)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 866-0199
Mfr. Part No.NE555P
kr 3,12
Each (In a Tube of 50)
Units
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA 300 ns @ 15 pF
RS Stock No. 221-5535
Mfr. Part No.NE555P
kr 3,12
Each (In a Pack of 50)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 178-4795
Mfr. Part No.MC14541BDG
Brandonsemi
kr 4,983
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. 823-4043
Mfr. Part No.NE555S-13
kr 2,881
Each (In a Pack of 50)
Units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 122-3283
Mfr. Part No.NE555S-13
kr 1,022
Each (On a Reel of 2500)
Units
Surface Mount Programmable SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 518-9518A
Mfr. Part No.MC14541BDG
kr 3,421
Each (In a Pack 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. 518-9518
Mfr. Part No.MC14541BDG
kr 5,76
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. 920-3431
Mfr. Part No.SA555P
kr 3,629
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS Stock No. 761-6104
Mfr. Part No.LMC555CMM/NOPB
kr 12,784
Each (In a Pack of 5)
Units
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS Stock No. 145-0415
Mfr. Part No.TLC551CP
kr 21,628
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 517-1618
Mfr. Part No.SA555P
kr 3,631
Each (In a Pack of 10)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS Stock No. 146-2399
Mfr. Part No.ICM7556IPDZ
kr 13,794
Each (In a Tube of 25)
Units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 921-5377
Mfr. Part No.ICM7556IPDZ
kr 16,286
Each (In a Pack of 5)
Units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 169-8718
Mfr. Part No.LM555CN
Brandonsemi
kr 2,217
Each (On a Reel of 3000)
Units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 922-2158
Mfr. Part No.LMC555CMM/NOPB
kr 9,757
Each (On a Reel of 1000)
Units
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS Stock No. 662-4677
Mfr. Part No.TLC551CP
kr 25,482
Each (In a Pack of 5)
Units
Through Hole Standard PDIP 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 787-779
Mfr. Part No.TLC556CD
kr 15,76
Each
Units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 190-5908
Mfr. Part No.DS1100LZ-20+
kr 71,86
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 -