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 662-3993
製造零件編號NE556DR
HK$2.786
/個 (每包:10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 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 -
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 921-5507
製造零件編號ICM7555IBAZ
HK$4.345
/個 (每包:25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 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 923-1470
製造零件編號IS82C54-10Z
HK$178.177
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
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 - - - -
全新
RS庫存編號 189-7189
製造零件編號ICM7555IPA+
BrandMaxim
HK$16.275
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 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 -
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 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 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 662-4003
製造零件編號TLC556CDR
HK$7.718
/個 (每包:5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 809-6232
製造零件編號CD4541BPW
HK$2.813
/個 (每包:15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
全新
RS庫存編號 190-5926
製造零件編號ICM7242IPA+
BrandMaxim
HK$28.22
/個 (每包:5個)
單位
Through Hole - PDIP 1 8 - 2 V 16 V 0 °C +85 °C - - - -
全新
RS庫存編號 190-5911
製造零件編號DS1100LZ-200+
BrandMaxim
HK$59.565
/個 (每包:2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 709-2110
製造零件編號SE555P
HK$3.486
/個 (每包:5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 189-8615
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 - - - -
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 485-8904
製造零件編號HEF4541BT,512
BrandNexperia
HK$2.992
/個 (每包:10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