Timer Circuits

Timer circuits are used to control one or more sequences of events within an electronic system. Timer circuits work by changing the circuit from its current state to another in advance following a set parameter.

Where would I use a timer circuit?

You can use timer circuits for a wide range of basic timing functions, like turning a light on for a certain amount of time or on and off repeatedly within a set time to create a flashing light or lighting sequence. Timer circuits 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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Omschrijving Prijs 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-stocknr. 806-2835
FabrikantnummerLM555CN
FabrikantON Semiconductor
€ 0,474
Each (In a Tube of 50)
Aantal stuks
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS-stocknr. 169-8718
FabrikantnummerLM555CN
FabrikantON Semiconductor
€ 0,194
Each (On a Reel of 3000)
Aantal stuks
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS-stocknr. 162-9390
FabrikantnummerMC1455DR2G
FabrikantON Semiconductor
€ 0,124
Each (On a Reel of 2500)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS-stocknr. 787-8702
FabrikantnummerMC1455DG
FabrikantON Semiconductor
€ 0,332
Each (In a Pack of 14)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS-stocknr. 787-8706
FabrikantnummerMC1455DR2G
FabrikantON Semiconductor
€ 0,301
Each (In a Pack of 20)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +75 °C 15mA - 200mA -
RS-stocknr. 166-2846
FabrikantnummerFT3001MPX
FabrikantON Semiconductor
€ 0,328
Each (On a Reel of 3000)
Aantal stuks
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS-stocknr. 518-9518A
FabrikantnummerMC14541BDG
FabrikantON Semiconductor
€ 0,178
Each (In a Pack of 55)
Aantal stuks
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-stocknr. 787-8709
FabrikantnummerMC1455BDR2G
FabrikantON Semiconductor
€ 0,36
Each (In a Pack of 10)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS-stocknr. 518-9518
FabrikantnummerMC14541BDG
FabrikantON Semiconductor
€ 0,36
Each
Aantal stuks
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-stocknr. 145-4759
FabrikantnummerMC1455BDR2G
FabrikantON Semiconductor
€ 0,149
Each (On a Reel of 2500)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS-stocknr. 178-4795
FabrikantnummerMC14541BDG
FabrikantON Semiconductor
€ 0,285
Each (In a Tube of 55)
Aantal stuks
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