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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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 221-5535
Tillv. art.nrNE555P
VarumärkeTexas Instruments
2,451 kr
Each (In a Pack of 50)
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Through Hole Standard PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-artikelnummer 866-0199
Tillv. art.nrNE555P
VarumärkeTexas Instruments
2,451 kr
Each (In a Tube of 50)
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Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA 300 ns @ 15 pF
RS-artikelnummer 921-5507
Tillv. art.nrICM7555IBAZ
6,62 kr
Each (In a Pack of 25)
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Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 170-8188
Tillv. art.nrICM7555IBAZ
VarumärkeIntersil
6,298 kr
Each (In a Tube of 98)
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Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 100-0685
Tillv. art.nrLM555CM/NOPB
VarumärkeTexas Instruments
13,281 kr
Each (In a Tube of 95)
Enheter
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS-artikelnummer 460-516
Tillv. art.nrLM555CM/NOPB
VarumärkeTexas Instruments
10,216 kr
Each (In a Pack of 10)
Enheter
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS-artikelnummer 528-410
Tillv. art.nrTLC555IDR
VarumärkeTexas Instruments
6,108 kr
Each (In a Pack of 25)
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Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS-artikelnummer 785-818
Tillv. art.nrNE555D
VarumärkeTexas Instruments
4,16 kr
Each
Enheter
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-artikelnummer 796-8316
Tillv. art.nrTLC555MJG
VarumärkeTexas Instruments
132,715 kr
Each (In a Pack of 2)
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Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS-artikelnummer 121-8520
Tillv. art.nrTLC555IP
VarumärkeTexas Instruments
6,968 kr
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
RS-artikelnummer 178-5489
Tillv. art.nrTLC555MJG
VarumärkeTexas Instruments
56,611 kr
Each (In a Tube of 10)
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Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS-artikelnummer 528-416
Tillv. art.nrNE556N
VarumärkeTexas Instruments
4,253 kr
Each (In a Tube of 25)
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Through Hole Standard PDIP 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS-artikelnummer 620-0357
Tillv. art.nrTLC555ID
VarumärkeTexas Instruments
6,43 kr
Each (In a Pack of 10)
Enheter
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS-artikelnummer 921-5374
Tillv. art.nrICM7555IPAZ
7,603 kr
Each (In a Pack of 10)
Enheter
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 858-0894
Tillv. art.nrLTC6994IS6-1#TRMPBF
VarumärkeAnalog Devices
36,578 kr
Each (In a Pack of 5)
Enheter
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns@ 5 pF
RS-artikelnummer 121-8948
Tillv. art.nrTLC555ID
VarumärkeTexas Instruments
6,427 kr
Each (In a Tube of 75)
Enheter
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS-artikelnummer 346-7024
Tillv. art.nrTLC555IP
VarumärkeTexas Instruments
8,42 kr
Each
Enheter
Through Hole Standard PDIP 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS-artikelnummer 121-8461
Tillv. art.nrNE555D
VarumärkeTexas Instruments
3,002 kr
Each (In a Tube of 75)
Enheter
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C 15mA 200mA -200mA -
RS-artikelnummer 170-8173
Tillv. art.nrICM7555IPAZ
7,599 kr
Each (In a Tube of 50)
Enheter
Through Hole Standard PDIP 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS-artikelnummer 920-0177
Tillv. art.nrLTC6994IS6-1#TRMPBF
VarumärkeAnalog Devices
22,266 kr
Each (On a Reel of 500)
Enheter
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns @ 5 pF