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. 121-9248
Mfr. Part No.SE555P
£0.285
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
£0.42
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. 121-8449
Mfr. Part No.TLC555CP
£0.559
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 638-942
Mfr. Part No.TLC555CP
£2.01
Each
Units
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 121-8804
Mfr. Part No.LMC555CN/NOPB
£0.861
Each (In a Tube of 40)
Units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS Stock No. 534-4002
Mfr. Part No.LMC555CN/NOPB
£2.01
Each
Units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 169-8718
Mfr. Part No.LM555CN
£0.176
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. 806-2835
Mfr. Part No.LM555CN
£0.431
Each (In a Tube of 50)
Units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 866-0192
Mfr. Part No.LM555CN/NOPB
£0.725
Each (In a Tube of 40)
Units
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - - - 100ns
RS Stock No. 124-4531
Mfr. Part No.LM555CN/NOPB
£0.798
Each (In a Pack of 10)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200 (Sink)mA 200 (Source)mA -
RS Stock No. 170-8173
Mfr. Part No.ICM7555IPAZ
£0.549
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 921-5374
Mfr. Part No.ICM7555IPAZ
£0.604
Each (In a Pack of 10)
Units
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 346-7024
Mfr. Part No.TLC555IP
£2.01
Each
Units
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 121-8803
Mfr. Part No.LMC555CM/NOPB
£0.832
Each (In a Tube of 95)
Units
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS Stock No. 534-3992
Mfr. Part No.LMC555CM/NOPB
£2.01
Each
Units
Surface Mount Standard SOIC 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 528-416
Mfr. Part No.NE556N
£0.353
Each (In a Tube of 25)
Units
Through Hole Standard PDIP 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS Stock No. 923-5573
Mfr. Part No.DS1682S+
BrandMaxim
£2.841
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. 698-7127
Mfr. Part No.DS1682S+
BrandMaxim
£4.15
Each
Units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 921-5377
Mfr. Part No.ICM7556IPDZ
£0.54
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. 146-2399
Mfr. Part No.ICM7556IPDZ
£0.508
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 -
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