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. 190-4888
Mfr. Part No.MAX7375AXR805+T
HK$7.338
Each (On a Reel of 2500)
units
Surface Mount - SC-70 - 3 9.99MHz 2.7 V 5.5 V -40 °C +125 °C - - - -
New
RS Stock No. 197-7395
Mfr. Part No.NE556DR
HK$3.31
Each (In a Pack of 25)
units
- - SOIC - 14 - - - - - - - - -
RS Stock No. 189-7188
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. 709-2532
Mfr. Part No.CD4536BEE4
HK$2.764
Each (In a Pack of 10)
units
Through Hole Programmable PDIP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns@ 5 V
RS Stock No. 162-8608
Mfr. Part No.LMC555IM/NOPB
HK$11.21
Each (In a Tube of 95)
units
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS Stock No. 190-4881
Mfr. Part No.DS1100LZ-20+
HK$43.33
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. 190-5904
Mfr. Part No.DS1023S-200+
HK$145.29
Each
units
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
RS Stock No. 178-7003
Mfr. Part No.HEF4541BT,512
BrandNexperia
HK$4.511
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. 190-4879
Mfr. Part No.DS1023S-200+
HK$118.436
Each (In a Tube of 46)
units
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
RS Stock No. 910-1733
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
HK$6.82
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 -
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