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. 162-7095
Mfr. Part No.TLC556IDR
HK$4.741
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 162-6928
Mfr. Part No.CD4536BPWR
HK$1.292
Each (On a Reel of 2000)
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
New
RS Stock No. 190-4887
Mfr. Part No.ICM7556ISD+
HK$20.806
Each (In a Tube of 50)
units
Surface Mount - SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
RS Stock No. 662-4012
Mfr. Part No.TLC556IDR
HK$9.94
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. 485-8904
Mfr. Part No.HEF4541BT,512
BrandNexperia
HK$2.992
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
New
RS Stock No. 190-5952
Mfr. Part No.ICM7556ISD+
HK$23.634
Each (In a Pack of 5)
units
Surface Mount - SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
RS Stock No. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
HK$3.556
Each (In a Tube of 98)
units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
New
RS Stock No. 190-4886
Mfr. Part No.ICM7555ESA+
HK$12.681
Each (In a Tube of 100)
units
Surface Mount - SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 162-6643
Mfr. Part No.NA555DR
HK$0.805
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. 162-7011
Mfr. Part No.NE556DR
HK$1.226
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS Stock No. 910-1705
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
HK$6.92
Each (In a Pack of 10)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
New
RS Stock No. 190-4882
Mfr. Part No.DS1100LZ-200+
HK$39.889
Each (In a Tube of 100)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 921-5677
Mfr. Part No.IS82C54-10Z
HK$161.39
Each
units
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS Stock No. 823-4043
Mfr. Part No.NE555S-13
HK$2.418
Each (In a Pack of 50)
units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 146-1009
Mfr. Part No.ICM7555ISA+
HK$12.67
Each (In a Tube of 100)
units
Surface Mount Standard SOIC 1 8 0.5MHz 2 V 18 V -20 °C +85 °C - 3.2mA -2mA -
RS Stock No. 121-9741
Mfr. Part No.TPL5000DGST
HK$9.83
Each (On a Reel of 250)
units
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
New
RS Stock No. 190-5939
Mfr. Part No.ICM7555ESA+
HK$14.544
Each (In a Pack of 10)
units
Surface Mount - SOIC 1 8 - 2 V 18 V -40 °C +85 °C - - - -
RS Stock No. 923-1405
Mfr. Part No.IS82C54Z
HK$117.788
Each (In a Tube of 37)
units
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 150 ns @ 5 V
RS Stock No. 121-9209
Mfr. Part No.TLC556IN
HK$9.451
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 809-6232
Mfr. Part No.CD4541BPW
HK$2.813
Each (In a Pack of 15)
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
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