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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Description Price 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
New
RS Stock No. 190-5914
Mfr. Part No.DS1100LZ-50+
HK$59.565
Each (In a Pack of 2)
units
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS Stock No. 920-0177
Mfr. Part No.LTC6994IS6-1#TRMPBF
HK$21.542
Each (On a Reel of 500)
units
Surface Mount Programmable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 24 ns @ 5 pF
RS Stock No. 910-1705
Mfr. Part No.MIC1557YM5-TR
BrandMicrochip
HK$6.92
Each (In a Pack of 10)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
New
RS Stock No. 189-8615
Mfr. Part No.DS1682S+
HK$50.09
Each (In a Pack of 2)
units
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
RS Stock No. 922-2690
Mfr. Part No.TLC555CDR
HK$2.362
Each (On a Reel of 2500)
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 168-4873
Mfr. Part No.TLC555CD
HK$6.037
Each (In a Tube of 75)
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS Stock No. 185-0950
Mfr. Part No.BD9555FVM-CGTR
BrandROHM
HK$5.027
Each (On a Reel of 3000)
units
Surface Mount - MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA -
RS Stock No. 921-0745
Mfr. Part No.NA555S-13
HK$3.254
Each (In a Pack of 30)
units
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C - 200mA -200mA -
RS Stock No. 923-1470
Mfr. Part No.IS82C54-10Z
HK$179.981
Each (In a Tube of 37)
units
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 Stock No. 732-1317
Mfr. Part No.SE555JG
HK$68.58
Each
units
Through Hole Standard CDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS Stock No. 170-8188
Mfr. Part No.ICM7555IBAZ
BrandIntersil
HK$4.978
Each (In a Tube of 98)
units
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS Stock No. 165-4290
Mfr. Part No.MIC1555YM5-TR
BrandMicrochip
HK$5.577
Each (On a Reel of 3000)
units
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS Stock No. 772-9310
Mfr. Part No.FT3001MPX
HK$5.076
Each (In a Pack of 10)
units
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
RS Stock No. 788-334
Mfr. Part No.TLC555CD
HK$7.29
Each
units
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
New
RS Stock No. 190-5952
Mfr. Part No.ICM7556ISD+
HK$36.334
Each (In a Pack of 5)
units
Surface Mount - SOIC 1 14 - 2 V 18 V -20 °C +85 °C - - - -
RS Stock No. 145-7365
Mfr. Part No.TLC556MD
HK$15.014
Each (In a Tube of 50)
units
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -
RS Stock No. 178-5489
Mfr. Part No.TLC555MJG
HK$61.487
Each (In a Tube of 10)
units
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS Stock No. 921-5595
Mfr. Part No.CS82C54Z
HK$87.13
Each
units
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V 0 °C +70 °C - 2.5mA -2.5mA 150 ns @ 5 V
New
RS Stock No. 191-4848
Mfr. Part No.ICM7556IPD+
HK$30.706
Each (In a Pack of 5)
units
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS Stock No. 517-1618
Mfr. Part No.SA555P
HK$3.234
Each (In a Pack of 10)
units
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
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