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 circuitsYou 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 timersThe 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. 112-5368
Mfr. Part No.NE556D
£0.41
Each
Units
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS Stock No. 145-0833
Mfr. Part No.NE556D
£0.327
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. 162-7010
Mfr. Part No.NE555PWR
£0.064
Each (On a Reel of 2000)
Units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 662-3999
Mfr. Part No.NE555PWR
£0.207
Each (In a Pack of 10)
Units
Surface Mount Standard TSSOP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS Stock No. 709-2532
Mfr. Part No.CD4536BEE4
£0.229
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. 165-4290
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
£0.457
Each (On a Reel of 3000)
Units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS Stock No. 910-1733
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
£0.602
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. 145-0016
Mfr. Part No.CD4536BEE4
£0.188
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. 145-1051
Mfr. Part No.CD4541BM
£0.293
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. 662-4668
Mfr. Part No.CD4541BM
£0.293
Each (In a Pack of 10)
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. 787-8706
Mfr. Part No.MC1455DR2G
£0.271
Each (In a Pack of 20)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 162-9390
Mfr. Part No.MC1455DR2G
£0.112
Each (On a Reel of 2500)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 922-2158
Mfr. Part No.LMC555CMM/NOPB
£0.693
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. 761-6104
Mfr. Part No.LMC555CMM/NOPB
£0.976
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. 787-8702
Mfr. Part No.MC1455DG
£0.332
Each (In a Pack of 14)
Units
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS Stock No. 122-3283
Mfr. Part No.NE555S-13
£0.074
Each (On a Reel of 2500)
Units
Surface Mount Programmable SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS Stock No. 823-4043
Mfr. Part No.NE555S-13
£0.209
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. 121-8948
Mfr. Part No.TLC555ID
£0.532
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. 620-0357
Mfr. Part No.TLC555ID
£0.532
Each (In a Pack of 10)
Units
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS Stock No. 178-5476
Mfr. Part No.SE556J
£10.725
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 -