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
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RS庫存編號 190-4884
製造零件編號ICM7240IPE+
HK$48.753
毎管:25 個
單位
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
全新
RS庫存編號 197-7307
製造零件編號LM555CN/NOPB
HK$8.363
毎管:40 個
單位
- - PDIP - 8 - - - - - - - - -
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RS庫存編號 197-7394
製造零件編號NE556DR
HK$1.177
個 (在毎卷:2500)
單位
- - SOIC - 14 - - - - - - - - -
RS庫存編號 921-5677
製造零件編號IS82C54-10Z
HK$204.31
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
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RS庫存編號 190-5926
製造零件編號ICM7242IPA+
HK$42.58
/個 (每包:5個)
單位
Through Hole - PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
RS庫存編號 146-1009
製造零件編號ICM7555ISA+
HK$17.111
毎管:100 個
單位
Surface Mount Standard SOIC 1 8 0.5MHz 2 V 18 V -20 °C +85 °C - 3.2mA -2mA -
RS庫存編號 796-8316
製造零件編號TLC555MJG
HK$52.325
/個 (每包:2個)
單位
Through Hole Standard CDIP 1 8 2.1MHz 2 V 15 V -55 °C +125 °C 350µA -10mA 100mA -
RS庫存編號 162-6643
製造零件編號NA555DR
HK$0.83
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C 15mA 200mA -200mA 300 ns @ 15 pF
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RS庫存編號 197-7392
製造零件編號NE555DR
HK$0.65
個 (在毎卷:2500)
單位
- - SOIC - 8 - - - - - - - - -
RS庫存編號 788-334
製造零件編號TLC555CD
HK$7.29
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 662-3996
製造零件編號CD4536BPWR
HK$3.303
/個 (每包:10個)
單位
Surface Mount Programmable TSSOP 1 16 - 3 V 18 V -55 °C +125 °C 0.1mA 4.2mA -4.2mA 8000 ns@ 5 V
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RS庫存編號 197-7496
製造零件編號SE555JG
HK$100.10
單位
- - CDIP - 8 - - - - - - - - -
RS庫存編號 824-6986
製造零件編號LMC555IM/NOPB
HK$12.994
/個 (每包:5個)
單位
Surface Mount Reset SOIC 1 8 3MHz 1.5 V 15 V -40 °C +125 °C - -10mA 50mA 100ns
RS庫存編號 103-9932
製造零件編號ICM7555IPA+
HK$38.781
毎管:50 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 168-4872
製造零件編號TLC556CD
HK$11.015
毎管:50 個
單位
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 923-1470
製造零件編號IS82C54-10Z
HK$179.981
毎管:37 個
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 922-2690
製造零件編號TLC555CDR
HK$2.362
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 885-5564
製造零件編號SA555S-13
HK$3.018
/個 (每包:50個)
單位
Surface Mount Precision, Reset SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS庫存編號 145-5776
製造零件編號TLC556ID
HK$10.564
毎管:50 個
單位
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C 85 °C - 100mA -10mA -
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RS庫存編號 189-7189
製造零件編號ICM7555IPA+
HK$24.569
毎管:50 個
單位
Through Hole Standard PDIP 1 8 - 2 V 18 V -20 °C +85 °C - 3.2mA 2mA -