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
0,23 €
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
0,237 €
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
0,194 €
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. 121-9248
FabrikantnummerSE555P
0,363 €
Each (In a Tube of 50)
Aantal stuks
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS-stocknr. 709-2110
FabrikantnummerSE555P
0,50 €
Each (In a Pack of 5)
Aantal stuks
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS-stocknr. 178-5489
FabrikantnummerTLC555MJG
5,705 €
Each (In a Tube of 10)
Aantal stuks
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS-stocknr. 796-8316
FabrikantnummerTLC555MJG
12,835 €
Each (In a Pack of 2)
Aantal stuks
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS-stocknr. 785-818
FabrikantnummerNE555D
0,39 €
Each
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-stocknr. 121-8461
FabrikantnummerNE555D
0,281 €
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. 638-958
FabrikantnummerTLC556CN
1,27 €
Each
Aantal stuks
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 145-0833
FabrikantnummerNE556D
0,363 €
Each (In a Tube of 50)
Aantal stuks
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS-stocknr. 145-0078
FabrikantnummerTLC556CN
1,078 €
Each (In a Tube of 25)
Aantal stuks
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS-stocknr. 112-5368
FabrikantnummerNE556D
0,50 €
Each
Aantal stuks
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS-stocknr. 100-0685
FabrikantnummerLM555CM/NOPB
1,245 €
Each (In a Tube of 95)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS-stocknr. 460-516
FabrikantnummerLM555CM/NOPB
0,958 €
Each (In a Pack of 10)
Aantal stuks
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS-stocknr. 146-2399
FabrikantnummerICM7556IPDZ
1,299 €
Each (In a Tube of 25)
Aantal stuks
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-stocknr. 923-1477
FabrikantnummerCS82C54-10Z96
6,909 €
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. 910-1733
FabrikantnummerMIC1555YM5-TR
FabrikantMicrochip
0,715 €
Each (In a Pack of 10)
Aantal stuks
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS-stocknr. 517-1618
FabrikantnummerSA555P
0,345 €
Each (In a Pack of 10)
Aantal stuks
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS-stocknr. 921-5377
FabrikantnummerICM7556IPDZ
1,72 €
Each (In a Pack of 5)
Aantal stuks
Through Hole Standard PDIP 2 14 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -