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. 188-9229
Mfr. Part No.TS556IDTTR
SGD0.77
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. 190-4886
Mfr. Part No.ICM7555ESA+
SGD2.87
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. 168-4872
Mfr. Part No.TLC556CD
SGD1.97
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. 732-1313
Mfr. Part No.SE556J
SGD26.81
Each
units
Through Hole Standard CDIP 2 14 - 4.5 V 18 V -55 °C +125 °C 24mA 200mA -200mA -
RS Stock No. 196-8888
Mfr. Part No.ICM7555CBAZ-T
SGD0.956
Each (In a Pack of 25)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 190-4884
Mfr. Part No.ICM7240IPE+
SGD10.853
Each (In a Tube of 25)
units
Through Hole Fixed, Programmable PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS Stock No. 540-4520
Mfr. Part No.ICM7555ISA+
SGD3.61
Each
units
Surface Mount Standard SOIC 1 8 0.5MHz 2 V 18 V -20 °C +85 °C - 3.2mA -2mA -
RS Stock No. 178-7003
Mfr. Part No.HEF4541BT,512
BrandNexperia
SGD0.787
Each (In a Tube of 57)
units
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V
RS Stock No. 190-4883
Mfr. Part No.DS1100LZ-50+
SGD7.615
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+
SGD12.585
Each (In a Pack of 2)
units
Through Hole Fixed, Programmable PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS Stock No. 190-5926
Mfr. Part No.ICM7242IPA+
SGD7.44
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. 528-410
Mfr. Part No.TLC555IDR
SGD1.03
Each (In a Pack of 25)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 146-2399
Mfr. Part No.ICM7556IPDZ
SGD1.95
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. 921-5677
Mfr. Part No.IS82C54-10Z
SGD42.41
Each
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 196-8887
Mfr. Part No.ICM7555CBAZ-T
SGD0.412
Each (On a Reel of 2500)
units
- Standard SOIC 1 8 1MHz - - - - - - - -
RS Stock No. 190-4888
Mfr. Part No.MAX7375AXR805+T
SGD1.374
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. 197-7307
Mfr. Part No.LM555CN/NOPB
SGD1.244
Each (In a Tube of 40)
units
- - PDIP 1 8 - - - - - - - - -