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. 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. 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. 921-5374
Mfr. Part No.ICM7555IPAZ
HK$6.015
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. 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. 170-8173
Mfr. Part No.ICM7555IPAZ
HK$5.84
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. 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. 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 -
New
RS Stock No. 196-8891
Mfr. Part No.ICM7555IBAZ-T
HK$5.485
Each (In a Pack of 25)
units
- Standard SOIC - 8 1MHz - - - - - - - -
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. 190-5917
Mfr. Part No.ICM7240IPE+
HK$51.60
Each (In a Pack of 2)
units
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS Stock No. 190-5920
Mfr. Part No.MAX7375AXR805+T
HK$12.88
Each (In a Pack of 5)
units
Surface Mount - SC-70 - 3 9.99MHz 2.7 V 5.5 V -40 °C +125 °C - - - -
RS Stock No. 787-8709
Mfr. Part No.MC1455BDR2G
HK$3.84
Each (In a Pack of 10)
units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
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. 772-9310
Mfr. Part No.FT3001MPX
HK$5.18
Each (In a Pack of 10)
units
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS Stock No. 796-8316
Mfr. Part No.TLC555MJG
HK$69.085
Each (In a Pack of 2)
units
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
New
RS Stock No. 197-7573
Mfr. Part No.TLC555CP
HK$6.037
Each (In a Tube of 50)
units
- - PDIP 1 8 2MHz - - - - - - - -
RS Stock No. 923-5573
Mfr. Part No.DS1682S+
HK$34.14
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. 121-9741
Mfr. Part No.TPL5000DGST
HK$10.44
Each (On a Reel of 250)
units
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
RS Stock No. 662-4687
Mfr. Part No.TLC556ID
HK$12.66
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 921-5951
Mfr. Part No.ICM7242IPAZ
HK$48.00
Each (In a Pack of 2)
units
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
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