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. 866-0199
Mfr. Part No.NE555P
£0.207
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
£0.207
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. 709-2110
Mfr. Part No.SE555P
£0.45
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. 121-9248
Mfr. Part No.SE555P
£0.327
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. 121-8461
Mfr. Part No.NE555D
£0.254
Each (In a Tube of 75)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 785-818
Mfr. Part No.NE555D
£0.35
Each
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 169-8718
Mfr. Part No.LM555CN
£0.167
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. 921-5374
Mfr. Part No.ICM7555IPAZ
£0.642
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. 170-8173
Mfr. Part No.ICM7555IPAZ
£0.642
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. 346-7024
Mfr. Part No.TLC555IP
£0.71
Each
Units
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 121-8520
Mfr. Part No.TLC555IP
£0.589
Each (In a Tube of 50)
Units
- - - - - - - - - - - - - -
RS Stock No. 528-416
Mfr. Part No.NE556N
£0.359
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. 921-5377
Mfr. Part No.ICM7556IPDZ
£1.55
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
£1.17
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. 923-6712
Mfr. Part No.CD4541BE
£0.354
Each (In a Tube of 25)
Units
Through Hole Programmable PDIP 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns @ 5 V
RS Stock No. 709-1999
Mfr. Part No.CD4541BE
£0.379
Each (In a Pack of 10)
Units
Through Hole Programmable PDIP 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
RS Stock No. 178-7003
Mfr. Part No.HEF4541BT,512
BrandNexperia
£0.396
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. 485-8904
Mfr. Part No.HEF4541BT,512
BrandNexperia
£0.396
Each (In a Pack of 10)
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. 165-4288
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
£0.457
Each (On a Reel of 3000)
Units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS Stock No. 923-1571
Mfr. Part No.ICM7242IPAZ
£3.702
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -