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 662-4687
製造零件編號TLC556ID
HK$5.14
/個 (每包:5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 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 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
RS庫存編號 662-4696
製造零件編號TLC556IN
HK$11.284
/個 (每包:5個)
單位
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 866-0192
製造零件編號LM555CN/NOPB
HK$6.779
毎管:40 個
單位
Through Hole Adjustable and Monostable PDIP 1 8 - 4.5 V 16 V 0 °C +70 °C - - - 100ns
RS庫存編號 787-779
製造零件編號TLC556CD
HK$12.54
單位
Surface Mount Standard SOIC 2 14 2MHz 2 V 18 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 823-4043
製造零件編號NE555S-13
HK$1.38
/個 (每包:50個)
單位
Surface Mount Precision SOIC 1 8 - 4.5 V 16 V 0 °C +70 °C - 200mA -200mA -
RS庫存編號 540-4520
製造零件編號ICM7555ISA+
BrandMaxim
HK$14.13
單位
Surface Mount Standard SOIC 1 8 0.5MHz 2 V 18 V -20 °C +85 °C - 3.2mA -2mA -
全新
RS庫存編號 188-9296
製造零件編號TS556IDTTR
HK$92.09
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 825-3564
製造零件編號TLC552CD
HK$21.31
/個 (每包:5個)
單位
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
全新
RS庫存編號 190-5917
製造零件編號ICM7240IPE+
BrandMaxim
HK$51.60
/個 (每包:2個)
單位
Through Hole - PDIP 1 16 - 2 V 16 V -20 °C +85 °C - - - -
RS庫存編號 165-4288
製造零件編號MIC1557YM5-TR
BrandMicrochip
HK$4.423
個 (在毎卷:3000)
單位
Surface Mount Precision, Standard SOT-23 1 5 5MHz 2.7 V 18 V -40 °C +85 °C - 20mA -20mA -
RS庫存編號 145-5862
製造零件編號TLC552CD
HK$17.554
毎管:50 個
單位
Surface Mount Monolithic SOIC 2 14 2MHz 1 V 18 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 168-4872
製造零件編號TLC556CD
HK$6.303
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 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
全新
RS庫存編號 191-4247
製造零件編號ICM7556IPD+
BrandMaxim
HK$29.18
毎管:25 個
單位
Through Hole Monolithic PDIP 2 14 - 2 V 16.5 V -20 °C +85 °C - 3.2mA 2mA -
RS庫存編號 121-8449
製造零件編號TLC555CP
HK$4.747
毎管:50 個
單位
Through Hole Standard PDIP 1 8 2MHz 2 V 15 V 0 °C +70 °C - 100mA -10mA -
RS庫存編號 121-9741
製造零件編號TPL5000DGST
HK$9.83
個 (在毎卷:250)
單位
Surface Mount Programmable VSSOP 1 10 - 1.8 V 5 V -40 °C +105 °C - - - -
RS庫存編號 121-9209
製造零件編號TLC556IN
HK$9.451
毎管:25 個
單位
Through Hole Standard PDIP 2 14 2MHz 3 V 18 V -40 °C +85 °C - 100mA -10mA -
RS庫存編號 145-7365
製造零件編號TLC556MD
HK$10.78
毎管:50 個
單位
Surface Mount Standard SOIC 2 14 2MHz 5 V 18 V -55 °C +125 °C - 100mA -10mA -