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. 866-0199
FabrikantnummerNE555P
€ 0,253
Each (In a Tube of 50)
Aantal stuks
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA 300 ns @ 15 pF
RS-stocknr. 221-5535
FabrikantnummerNE555P
€ 0,26
Each (In a Pack of 50)
Aantal stuks
Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-stocknr. 169-8718
FabrikantnummerLM555CN
FabrikantON Semiconductor
€ 0,204
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. 121-8461
FabrikantnummerNE555D
€ 0,31
Each (In a Tube of 75)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-stocknr. 785-818
FabrikantnummerNE555D
€ 0,43
Each
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-stocknr. 923-1477
FabrikantnummerCS82C54-10Z96
€ 7,60
Each (On a Reel of 750)
Aantal stuks
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-stocknr. 921-5652
FabrikantnummerCS82C54-10Z96
€ 11,00
Each
Aantal stuks
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-stocknr. 921-5582
FabrikantnummerCS82C54-10Z
€ 10,83
Each
Aantal stuks
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-stocknr. 170-8196
FabrikantnummerCS82C54-10Z
FabrikantIntersil
€ 12,062
Each (In a Tube of 37)
Aantal stuks
Surface Mount Programmable PLCC 1 28 10MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 100 ns @ 5 V
RS-stocknr. 528-416
FabrikantnummerNE556N
€ 0,438
Each (In a Tube of 25)
Aantal stuks
Through Hole Standard PDIP 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS-stocknr. 788-334
FabrikantnummerTLC555CD
€ 0,77
Each
Aantal stuks
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 761-6104
FabrikantnummerLMC555CMM/NOPB
€ 1,072
Each (In a Pack of 5)
Aantal stuks
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS-stocknr. 921-5374
FabrikantnummerICM7555IPAZ
€ 0,784
Each (In a Pack of 10)
Aantal stuks
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 662-4006
FabrikantnummerTLC555CDR
€ 0,619
Each (In a Pack of 10)
Aantal stuks
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 170-8173
FabrikantnummerICM7555IPAZ
€ 0,784
Each (In a Tube of 50)
Aantal stuks
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 921-5677
FabrikantnummerIS82C54-10Z
€ 15,80
Each
Aantal stuks
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-stocknr. 922-2158
FabrikantnummerLMC555CMM/NOPB
€ 0,846
Each (On a Reel of 1000)
Aantal stuks
Surface Mount Programmable MSOP 1 8 3MHz - 15 V -40 °C +85 °C 0.4mA -10mA 50mA -
RS-stocknr. 168-4873
FabrikantnummerTLC555CD
€ 0,662
Each (In a Tube of 75)
Aantal stuks
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 922-2690
FabrikantnummerTLC555CDR
€ 0,288
Each (On a Reel of 2500)
Aantal stuks
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 923-1470
FabrikantnummerIS82C54-10Z
€ 16,066
Each (In a Tube of 37)
Aantal stuks
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