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
RS庫存編號 829-1516
製造零件編號STWD100YNPWY3F
HK$6.149
/個 (每包:10個)
單位
Surface Mount Watchdog SOT-23 1 5 - 2.7 V 5.5 V -40 °C +125 °C - - - -
RS庫存編號 528-410
製造零件編號TLC555IDR
HK$5.139
/個 (每包:25個)
單位
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 620-0357
製造零件編號TLC555ID
HK$5.738
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 806-2832
製造零件編號LM555CM
HK$2.083
毎管:90 個
單位
Surface Mount Reset SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 534-4002
製造零件編號LMC555CN/NOPB
HK$10.85
單位
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns@ 5 V
RS庫存編號 709-1999
製造零件編號CD4541BEE4
HK$3.028
/個 (每包:10個)
單位
Through Hole Programmable PDIP 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
RS庫存編號 169-8718
製造零件編號LM555CN
HK$1.221
個 (在毎卷:3000)
單位
Through Hole Reset PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - 50mA 200mA -
RS庫存編號 121-8804
製造零件編號LMC555CN/NOPB
HK$7.966
毎管:40 個
單位
Through Hole Standard PDIP 1 8 3MHz - - -40 °C +85 °C - 50mA -10mA 100 ns @ 5 V
RS庫存編號 662-4668
製造零件編號CD4541BM
HK$3.184
/個 (每包:10個)
單位
Surface Mount Programmable SOIC 1 14 0.1MHz 3 V 18 V -55 °C +125 °C 0.1mA 12.6mA -12.6mA 18000 ns@ 5 V
RS庫存編號 121-8948
製造零件編號TLC555ID
HK$4.153
毎管:75 個
單位
Surface Mount Standard SOIC 1 8 2MHz 3 V 15 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 121-9248
製造零件編號SE555P
HK$2.537
毎管:50 個
單位
Through Hole Standard PDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
全新
RS庫存編號 189-8665
製造零件編號ICM7555IPA+
BrandMaxim
HK$18.636
/個 (每包:5個)
單位
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -
RS庫存編號 858-0891
製造零件編號LTC6993CS6-4#TRMPBF
HK$27.826
/個 (每包:5個)
單位
Surface Mount Monostable TSOT-23 1 6 - 2.25 V 5.5 V -40 °C +85 °C - 16mA -16mA 28 ns@ 5 pF
RS庫存編號 921-5677
製造零件編號IS82C54-10Z
HK$161.39
單位
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庫存編號 732-1317
製造零件編號SE555JG
HK$68.58
單位
Through Hole Standard CDIP 1 8 - 4.5 V 18 V -55 °C +125 °C 12mA 200mA -200mA -
RS庫存編號 788-334
製造零件編號TLC555CD
HK$5.78
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 170-8188
製造零件編號ICM7555IBAZ
BrandIntersil
HK$3.556
毎管:98 個
單位
Surface Mount Standard SOIC 1 8 1MHz 2 V 18 V -25 °C +85 °C - 20mA -0.8mA -
RS庫存編號 923-1405
製造零件編號IS82C54Z
HK$117.788
毎管:37 個
單位
Surface Mount Programmable PLCC 1 28 8MHz 4.5 V 5.5 V -40 °C +85 °C - 2.5mA -2.5mA 150 ns @ 5 V
全新
RS庫存編號 190-4882
製造零件編號DS1100LZ-200+
BrandMaxim
HK$39.889
毎管:100 個
單位
Surface Mount Precision SOIC 1 8 1MHz 3 V 3.6 V -40 °C +85 °C - 8 (Minimum)mA -1mA -
RS庫存編號 662-4006
製造零件編號TLC555CDR
HK$4.298
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -