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 772-9310
製造零件編號FT3001MPX
HK$2.796
/個 (每包:10個)
單位
Surface Mount Reset MLP 4 8 - 1.8 V 5 V -40 °C +85 °C 1µA 500mA -500µA 7.2ns
全新
RS庫存編號 189-7190
製造零件編號ICM7555ISA+
BrandMaxim
HK$13.366
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 178-7003
製造零件編號HEF4541BT,512
BrandNexperia
HK$2.628
毎管:57 個
單位
Surface Mount Programmable SOIC 1 14 36MHz 3 V 15 V -40 °C +85 °C - 4.2mA -4.2mA 1150 ns @ 5 V
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 112-5368
製造零件編號NE556D
HK$4.39
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 920-3431
製造零件編號SA555P
HK$2.489
毎管:50 個
單位
Through Hole Standard PDIP 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA 200mA -200mA -
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 662-3996
製造零件編號CD4536BPWR
HK$2.76
/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
RS庫存編號 162-6643
製造零件編號NA555DR
HK$0.805
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
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 145-5776
製造零件編號TLC556ID
HK$8.706
毎管:50 個
單位
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C 85 °C - 100mA -10mA -
RS庫存編號 145-0078
製造零件編號TLC556CN
HK$8.129
毎管:25 個
單位
Through Hole Standard PDIP 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 921-5951
製造零件編號ICM7242IPAZ
HK$32.37
/個 (每包:2個)
單位
Through Hole Standard PDIP 1 8 13MHz 2 V 16 V -25 °C +85 °C 0.125mA 50mA - -
RS庫存編號 921-5595
製造零件編號CS82C54Z
HK$86.31
單位
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
RS庫存編號 145-4759
製造零件編號MC1455BDR2G
HK$1.511
個 (在毎卷:2500)
單位
Surface Mount Standard SOIC 1 8 - 4.5 V 16 V -40 °C +85 °C 15mA - 200mA -
RS庫存編號 178-5489
製造零件編號TLC555MJG
HK$61.487
毎管:10 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 145-0940
製造零件編號CD4541BPW
HK$2.112
毎管:90 個
單位
Surface Mount Programmable TSSOP 1 14 6MHz 3 V 18 V -55 °C +125 °C 100µA 12.6mA -12.6mA 18 μs @ 50 pF
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 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 -
RS庫存編號 662-4012
製造零件編號TLC556IDR
HK$9.94
/個 (每包:5個)
單位
Surface Mount Standard SOIC 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -