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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Beskrivning Pris 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-artikelnummer 787-8709
Tillv. art.nrMC1455BDR2G
VarumärkeON Semiconductor
3,64 kr
Each (In a Pack of 10)
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Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS-artikelnummer 825-3564
Tillv. art.nrTLC552CD
VarumärkeTexas Instruments
12,20 kr
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Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
RS-artikelnummer 858-0891
Tillv. art.nrLTC6993CS6-4#TRMPBF
VarumärkeAnalog Devices
32,054 kr
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Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns@ 5 pF
RS-artikelnummer 662-4003
Tillv. art.nrTLC556CDR
VarumärkeTexas Instruments
10,67 kr
Each (In a Pack of 5)
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Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS-artikelnummer 145-0415
Tillv. art.nrTLC551CP
VarumärkeTexas Instruments
16,395 kr
Each (In a Tube of 50)
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Through Hole Standard PDIP 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS-artikelnummer 662-4677
Tillv. art.nrTLC551CP
VarumärkeTexas Instruments
19,666 kr
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Through Hole Standard PDIP 1 8 2MHz 1 V 15 V 0 °C +70 °C - 100mA -10mA -
RS-artikelnummer 921-5951
Tillv. art.nrICM7242IPAZ
53,25 kr
Each (In a Pack of 2)
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Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS-artikelnummer 772-9310
Tillv. art.nrFT3001MPX
VarumärkeON Semiconductor
1,98 kr
Each (In a Pack of 10)
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Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS-artikelnummer 121-9741
Tillv. art.nrTPL5000DGST
VarumärkeTexas Instruments
6,816 kr
Each (On a Reel of 250)
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Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
RS-artikelnummer 178-5476
Tillv. art.nrSE556J
VarumärkeTexas Instruments
128,64 kr
Each (In a Tube of 10)
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Through Hole Standard CDIP 2 14 - 4.5 V 18 V -55 °C +125 °C 24mA 200mA -200mA -
RS-artikelnummer 662-4687
Tillv. art.nrTLC556ID
VarumärkeTexas Instruments
12,636 kr
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Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS-artikelnummer 156-5697
Tillv. art.nrLTC6993CS6-4#TRMPBF
VarumärkeAnalog Devices
33,983 kr
Each (On a Reel of 500)
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Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns @ 5 pF
RS-artikelnummer 190-5914
Tillv. art.nrDS1100LZ-50+
VarumärkeMaxim Integrated
54,285 kr
Each (In a Pack of 2)
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Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS-artikelnummer 923-1571
Tillv. art.nrICM7242IPAZ
45,248 kr
Each (In a Tube of 50)
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Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS-artikelnummer 196-8887
Tillv. art.nrICM7555CBAZ-T
2,283 kr
Each (On a Reel of 2500)
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- Standard SOIC 1 8 1MHz - - - - - - - -
RS-artikelnummer 190-4885
Tillv. art.nrICM7242IPA+
VarumärkeMaxim Integrated
35,541 kr
Each (In a Tube of 50)
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Through Hole Fixed, Programmable PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
RS-artikelnummer 188-9229
Tillv. art.nrTS556IDTTR
VarumärkeSTMicroelectronics
4,646 kr
Each (On a Reel of 2500)
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Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS-artikelnummer 191-4848
Tillv. art.nrICM7556IPD+
VarumärkeMaxim Integrated
45,91 kr
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Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS-artikelnummer 709-2110
Tillv. art.nrSE555P
VarumärkeTexas Instruments
5,17 kr
Each (In a Pack of 5)
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Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS-artikelnummer 920-3431
Tillv. art.nrSA555P
VarumärkeTexas Instruments
3,143 kr
Each (In a Tube of 50)
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Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
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