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 526-953
製造零件編號SA555D
HK$2.754
/個 (每包:10個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
RS庫存編號 740-5588
製造零件編號NJM555V-TE1
HK$6.716
/個 (每包:5個)
單位
Surface Mount Standard SSOP 1 8 - 4.5 V 16 V -40 °C +85 °C - 200mA -200mA -
RS庫存編號 103-9932
製造零件編號ICM7555IPA+
BrandMaxim
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 -
全新
RS庫存編號 190-4879
製造零件編號DS1023S-200+
BrandMaxim
HK$118.436
毎管:46 個
單位
Surface Mount Programmable SOIC 1 16 10MHz 4.75 V 5.25 V 0 °C +70 °C - 8 (Minimum)mA -1mA -
全新
RS庫存編號 189-8615
製造零件編號DS1682S+
BrandMaxim
HK$50.09
/個 (每包:2個)
單位
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
全新
RS庫存編號 188-9229
製造零件編號TS556IDTTR
HK$4.885
個 (在毎卷:2500)
單位
Surface Mount - SO 2 14 2.7MHz 2 V 16 V -40 °C +125 °C - 8mA -2mA 100 ns @ 10 pF
RS庫存編號 162-6928
製造零件編號CD4536BPWR
HK$1.292
個 (在毎卷:2000)
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
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 165-8649
製造零件編號SA555S-13
HK$1.08
個 (在毎卷:2500)
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 772-9313
製造零件編號FT7522L6X
HK$2.906
/個 (每包:25個)
單位
Surface Mount Reset MicroPak 1 6 - 1.8 V 5 V -40 °C +85 °C 1µA 50mA -50µA 9ns
全新
RS庫存編號 190-4884
製造零件編號ICM7240IPE+
BrandMaxim
HK$48.753
毎管:25 個
單位
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS庫存編號 162-7011
製造零件編號NE556DR
HK$1.226
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS庫存編號 185-0950
製造零件編號BD9555FVM-CGTR
BrandROHM
HK$4.374
個 (在毎卷:3000)
單位
Surface Mount - MSOP 1 8 - 4.5 V 42 V -40 °C +125 °C - 50mA -10mA -
RS庫存編號 162-8608
製造零件編號LMC555IM/NOPB
HK$8.63
毎管:95 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 145-0833
製造零件編號NE556D
HK$2.448
毎管:50 個
單位
Surface Mount Standard SOIC 2 14 - 4.5 V 16 V 0 °C +70 °C 30mA 200mA -200mA -
RS庫存編號 824-6986
製造零件編號LMC555IM/NOPB
HK$11.088
/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 809-6393
製造零件編號NA555DR
HK$2.127
/個 (每包:20個)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +105 °C 15mA 200mA -200mA 300 ns@ 15 pF
全新
RS庫存編號 189-7188
製造零件編號DS1682S+
BrandMaxim
HK$33.948
毎管:100 個
單位
Surface Mount Programmable SOIC - 8 0.1MHz 2.5 V 5.5 V -40 °C +85 °C - - - -
全新
RS庫存編號 190-4881
製造零件編號DS1100LZ-20+
BrandMaxim
HK$38.412
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 922-2690
製造零件編號TLC555CDR
HK$2.278
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -