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. 662-3999
Mfr. Part No.NE555PWR
HK$2.372
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. 528-410
Mfr. Part No.TLC555IDR
HK$5.547
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. 528-416
Mfr. Part No.NE556N
HK$3.636
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. 620-0357
Mfr. Part No.TLC555ID
HK$5.919
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. 121-8804
Mfr. Part No.LMC555CN/NOPB
HK$9.555
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. 709-1999
Mfr. Part No.CD4541BEE4
HK$3.636
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. 121-8948
Mfr. Part No.TLC555ID
HK$5.919
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. 145-1051
Mfr. Part No.CD4541BM
HK$3.401
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. 923-6712
Mfr. Part No.CD4541BEE4
HK$3.636
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. 534-4002
Mfr. Part No.LMC555CN/NOPB
HK$11.34
Each
units
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS Stock No. 662-4668
Mfr. Part No.CD4541BM
HK$3.401
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. 145-0368
Mfr. Part No.SE555D
HK$3.312
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 922-2690
Mfr. Part No.TLC555CDR
HK$2.362
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 638-958
Mfr. Part No.TLC556CN
HK$12.24
Each
units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 662-4674
Mfr. Part No.TLC551CD
HK$17.278
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 145-0940
Mfr. Part No.CD4541BPW
HK$3.401
Each (In a Tube of 90)
units
Surface Mount Programmable TSSOP 1 14 6MHz 3 V 18 V -55 °C +125 °C 100µA 12.6mA -12.6mA 18 μs @ 50 pF
RS Stock No. 162-6643
Mfr. Part No.NA555DR
HK$0.83
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C 15mA 200mA -200mA 300 ns @ 15 pF
RS Stock No. 660-7761
Mfr. Part No.SE555D
HK$4.362
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 124-4531
Mfr. Part No.LM555CN/NOPB
HK$8.587
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 -