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
New
RS Stock No. 197-7395
Mfr. Part No.NE556DR
HK$3.31
Each (In a Pack of 25)
units
- - SOIC - 14 - - - - - - - - -
New
RS Stock No. 197-7392
Mfr. Part No.NE555DR
HK$0.653
Each (On a Reel of 2500)
units
- - SOIC - 8 - - - - - - - - -
RS Stock No. 922-2690
Mfr. Part No.TLC555CDR
HK$2.41
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. 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 - - - -
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. 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. 761-6104
Mfr. Part No.LMC555CMM/NOPB
HK$8.848
Each (In a Pack of 5)
units
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS Stock No. 921-5541
Mfr. Part No.IS82C54Z
HK$165.41
Each
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. 178-5476
Mfr. Part No.SE556J
HK$123.276
Each (In a Tube of 10)
units
Through Hole Standard CDIP 2 14 - 4.5 V 18 V -55 °C +125 °C 24mA 200mA -200mA -
RS Stock No. 190-5914
Mfr. Part No.DS1100LZ-50+
HK$57.115
Each (In a Pack of 2)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
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. 165-8349
Mfr. Part No.NA555S-13
HK$1.16
Each (On a Reel of 2500)
units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
RS Stock No. 178-5489
Mfr. Part No.TLC555MJG
HK$61.487
Each (In a Tube of 10)
units
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
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. 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. 188-9296
Mfr. Part No.TS556IDTTR
HK$10.40
Each
units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS Stock No. 188-9229
Mfr. Part No.TS556IDTTR
HK$4.45
Each (On a Reel of 2500)
units
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS Stock No. 485-8904
Mfr. Part No.HEF4541BT,512
BrandNexperia
HK$4.728
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. 922-2158
Mfr. Part No.LMC555CMM/NOPB
HK$7.245
Each (On a Reel of 1000)
units
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS Stock No. 168-4873
Mfr. Part No.TLC555CD
HK$6.16
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
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