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. 121-8461
Mfr. Part No.NE555D
HK$2.44
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
HK$2.68
Each
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 221-5535
Mfr. Part No.NE555P
HK$2.413
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. 866-0199
Mfr. Part No.NE555P
HK$2.76
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. 662-3999
Mfr. Part No.NE555PWR
HK$2.42
Each (In a Pack of 10)
units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 162-7010
Mfr. Part No.NE555PWR
HK$0.846
Each (On a Reel of 2000)
units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 662-4668
Mfr. Part No.CD4541BM
HK$3.451
Each (In a Pack of 10)
units
Surface Mount Programmable SOIC 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. 528-410
Mfr. Part No.TLC555IDR
HK$5.66
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. 923-6712
Mfr. Part No.CD4541BE
HK$3.71
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. 620-0357
Mfr. Part No.TLC555ID
HK$6.04
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 709-1999
Mfr. Part No.CD4541BE
HK$3.71
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. 145-1051
Mfr. Part No.CD4541BM
HK$3.451
Each (In a Tube of 50)
units
Surface Mount Programmable SOIC 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. 121-8948
Mfr. Part No.TLC555ID
HK$6.04
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 528-416
Mfr. Part No.NE556N
HK$3.821
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. 145-5776
Mfr. Part No.TLC556ID
HK$10.78
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C 85 °C - 100mA -10mA -
RS Stock No. 662-3996
Mfr. Part No.CD4536BPWR
HK$3.37
Each (In a Pack of 10)
units
Surface Mount Programmable TSSOP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns@ 5 V
RS Stock No. 787-779
Mfr. Part No.TLC556CD
HK$13.09
Each
units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
New
RS Stock No. 197-7495
Mfr. Part No.SE555JG
HK$86.849
Each (In a Tube of 50)
units
- - CDIP - 8 - - - - - - - - -
RS Stock No. 920-3431
Mfr. Part No.SA555P
HK$3.399
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. 662-4012
Mfr. Part No.TLC556IDR
HK$11.98
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -