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. 518-9518
Mfr. Part No.MC14541BDG
kr 20,54
Each
Units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns@ 5 V
RS Stock No. 178-4795
Mfr. Part No.MC14541BDG
kr 2,931
Each (In a Tube of 55)
Units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns @ 5 V
RS Stock No. 518-9518A
Mfr. Part No.MC14541BDG
kr 2,416
Each (In a Pack of 55)
Units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns@ 5 V
RS Stock No. 823-4043
Mfr. Part No.NE555S-13
kr 2,345
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. 688-1543
Mfr. Part No.MC14541BDR2G
kr 4,188
Each (In a Pack of 5)
Units
Surface Mount Programmable SOIC 1 14 3MHz 3 V 18 V -55 °C +125 °C 0.02mA 19.3mA -16.3mA 18000 ns@ 5 V
RS Stock No. 162-7024
Mfr. Part No.SA556N
kr 4,044
Each (In a Tube of 25)
Units
Through Hole Standard PDIP 2 14 - 4.5 V 16 V -40 °C +85 °C 30mA 200mA -200mA -
RS Stock No. 122-3283
Mfr. Part No.NE555S-13
kr 0,879
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. 921-5377
Mfr. Part No.ICM7556IPDZ
kr 14,296
Each (In a Pack of 5)
Units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 920-3431
Mfr. Part No.SA555P
kr 3,308
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS Stock No. 103-9932
Mfr. Part No.ICM7555IPA+
kr 20,851
Each (In a Tube of 50)
Units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 169-8718
Mfr. Part No.LM555CN
kr 1,466
Each (On a Reel of 3000)
Units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 517-1618
Mfr. Part No.SA555P
kr 3,33
Each (In a Pack of 10)
Units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS Stock No. 806-2835
Mfr. Part No.LM555CN
kr 3,615
Each (In a Tube of 50)
Units
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS Stock No. 732-7664
Mfr. Part No.ICM7555IPA+
kr 24,23
Each
Units
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 146-2399
Mfr. Part No.ICM7556IPDZ
kr 12,148
Each (In a Tube of 25)
Units
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 162-6928
Mfr. Part No.CD4536BPWR
kr 1,727
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
RS Stock No. 809-6232
Mfr. Part No.CD4541BPW
kr 1,489
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
New
RS Stock No. 190-4879
Mfr. Part No.DS1023S-200+
kr 127,169
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. 188-9296
Mfr. Part No.TS556IDTTR
kr 18,25
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. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
kr 5,069
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 -
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