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. 485-8904
Mfr. Part No.HEF4541BT,512
BrandNexperia
HK$3.03
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
RS Stock No. 190-5952
Mfr. Part No.ICM7556ISD+
HK$37.718
Each (In a Pack of 5)
units
Surface Mount - SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
New
RS Stock No. 196-2111
Mfr. Part No.TS555IDTTR
HK$4.044
Each (On a Reel of 2500)
units
Surface Mount Monostable SO 2 8 2.7MHz 2 V 16 V -40 °C +125 °C - 1mA -0.3mA -
RS Stock No. 910-1705
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
HK$7.023
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 -
RS Stock No. 662-4696
Mfr. Part No.TLC556IN
HK$13.61
Each (In a Pack of 5)
units
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 885-5564
Mfr. Part No.SA555S-13
HK$3.08
Each (In a Pack of 50)
units
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS Stock No. 145-5862
Mfr. Part No.TLC552CD
HK$20.227
Each (In a Tube of 50)
units
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 923-1405
Mfr. Part No.IS82C54Z
HK$145.73
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. 662-4699
Mfr. Part No.TLC556MD
HK$18.06
Each (In a Pack of 5)
units
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
RS Stock No. 168-4872
Mfr. Part No.TLC556CD
HK$11.546
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 923-1470
Mfr. Part No.IS82C54-10Z
HK$181.335
Each (In a Tube of 37)
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. 145-0833
Mfr. Part No.NE556D
HK$3.852
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS Stock No. 191-4247
Mfr. Part No.ICM7556IPD+
HK$35.485
Each (In a Tube of 25)
units
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 165-8649
Mfr. Part No.SA555S-13
HK$1.08
Each (On a Reel of 2500)
units
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS Stock No. 145-0016
Mfr. Part No.CD4536BEE4
HK$1.807
Each (In a Tube of 25)
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. 190-4887
Mfr. Part No.ICM7556ISD+
HK$32.754
Each (In a Tube of 50)
units
Surface Mount - SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
New
RS Stock No. 197-7394
Mfr. Part No.NE556DR
HK$1.183
Each (On a Reel of 2500)
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. 145-0078
Mfr. Part No.TLC556CN
HK$10.70
Each (In a Tube of 25)
units
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 190-5926
Mfr. Part No.ICM7242IPA+
HK$43.888
Each (In a Pack of 5)
units
Through Hole - PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
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