Monostable Multivibrators

Monostable multivibrators, also known as one-shot multivibrators, are a type of electronic circuit that can be used as a timer. They have one stable and one unstable state. The unstable state is caused by a trigger pulse. This state is transient, so the circuit always returns to stability after a fixed time has elapsed. 


Generally, monostable multivibrator circuits are composed of two transistors, coupled with one resistor-capacitor network and one resistor network. These networks are what determines the length of time before the circuit returns to its stable state, after being triggered. 


What are monostable multivibrators used for?

Monostable multivibrators are used to produce a specific timed delay within a circuit. Therefore, they can broadly be used as timers or as pulse detectors in electronic equipment. 


Types of monostable multivibrators

There are two types of monostable multivibrators:

  • Retriggerable monostable multivibrators will remain in the unstable state with repeated application of the trigger pulse.
  • Non-retriggerable monostable multivibrators are unaffected by further trigger pulses, and will remain in the unstable state only for the predetermined period of time. 

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Description Price Logic Family Logic Function Number of Elements per Chip Maximum High Level Output Current Maximum Low Level Output Current Minimum Pulse Width Maximum Propagation Delay Time @ Maximum CL Maximum Quiescent Current Mounting Type Package Type Pin Count Dimensions Height Length
RS Stock No. 760-3397
Mfr. Part No.LTC6993CS6-1#TRMPBF
HK$46.68
Each
units
LVCMOS, LVTTL Monostable Multivibrator 1 -16mA 16mA 1 μs 28ns 0.2mA Surface Mount TSOT-23 6 2.9 x 1.75 x 1mm 1mm 2.9mm
RS Stock No. 662-7358
Mfr. Part No.CD74HCT423M96
HK$5.538
Each (In a Pack of 5)
units
HCT Monostable Multivibrator 2 -4mA 4mA 20 ns 68 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 145-1251
Mfr. Part No.SN74LV123APW
HK$4.43
Each (In a Tube of 90)
units
LV Monostable Multivibrator 2 -12mA 12mA 5 ns 36 ns @ 2.5 V 0.02mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 151-3351
Mfr. Part No.74HC4538PW,118
BrandNexperia
HK$1.62
Each (On a Reel of 2500)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 20 ns 400 ns @ 15 pF - Surface Mount TSSOP16 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 145-0420
Mfr. Part No.CD4047BM
HK$3.93
Each (In a Tube of 50)
units
4000 Monostable Multivibrator 1 - - 50 ns 1000 ns @ 5 V 0.02mA Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm
RS Stock No. 518-9445
Mfr. Part No.MC14528BDG
HK$5.20
Each
units
4000 Monostable Multivibrator 2 - - 55 ns 650 ns @ 5 V 0.02mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 305-591
Mfr. Part No.SN74121N
HK$31.12
Each
units
74 Monostable Multivibrator 1 -0.4mA 16mA 50 ns 80 ns @ 5 V 13mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 807-2583
Mfr. Part No.SN74AHCT123AN
HK$4.057
Each (In a Pack of 25)
units
AHCT Monostable Multivibrator 2 -8mA 8mA 5 ns 15 ns@ 50 pF 40µA Through Hole PDIP 16 19.69 x 6.6 x 4.57mm 4.57mm 19.69mm
RS Stock No. 355-8861
Mfr. Part No.HEF4047BT,652
BrandNexperia
HK$4.62
Each
units
4000 Monostable Multivibrator 1 - - 70 ns 320 ns@ 5 V 0.08mA Surface Mount SOIC 14 8.75 x 4 x 1.45mm 1.45mm 8.75mm
RS Stock No. 662-6594
Mfr. Part No.74LVC1G123DCTT
HK$8.968
Each (In a Pack of 5)
units
LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns 18.6 ns @ 1.8 V 0.02mA Surface Mount SSOP 8 2.95 x 2.8 x 1.29mm 1.29mm 2.95mm
RS Stock No. 146-0376
Mfr. Part No.74HCT221D,652
BrandNexperia
HK$6.45
Each (In a Tube of 50)
units
74HCT Monostable Multivibrator 2 -4mA 4mA 30 ns 75ns - Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 178-9223
Mfr. Part No.CD74HC221MT
HK$6.425
Each (In a Tube of 40)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 595 μs 315 ns @ 50 pF 160µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 162-6944
Mfr. Part No.CD74HC221PWR
HK$2.117
Each (On a Reel of 2000)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 12 ns 210 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 663-0477
Mfr. Part No.CD74HCT123M
HK$5.08
Each (In a Pack of 5)
units
HCT Monostable Multivibrator 2 -4mA 4mA 20 ns 68 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 541-9358
Mfr. Part No.TC74HC4538AF(F)
BrandToshiba
HK$10.764
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 250 ns @ 2 V 0.004mA Surface Mount SOP 16 10.3 x 5.3 x 1.5mm 1.5mm 10.3mm
RS Stock No. 164-6069
Mfr. Part No.LTC6993CS6-2#TRMPBF
HK$31.515
Each (In a Pack of 2)
units
LTC Monostable Multivibrator 1 -16mA +16mA 1 µs 28 ns @ 5 pF - Surface Mount TSOT-23 6 2.9 x 1.75 x 0.9mm 0.9mm 2.9mm
RS Stock No. 145-0702
Mfr. Part No.CD74HCT123M
HK$4.508
Each (In a Tube of 40)
units
HCT Monostable Multivibrator 2 -4mA 4mA 20 ns 68 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 178-4724
Mfr. Part No.MC14528BDG
HK$4.273
Each (In a Tube of 48)
units
4000 Monostable Multivibrator 2 - - 55 ns 650 ns @ 5 V 0.02mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 921-2808
Mfr. Part No.SN74LVC1G123DCTR
HK$2.816
Each (On a Reel of 3000)
units
LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns - 20µA Surface Mount SM 8 3.15 x 2.9 x 1.2mm 1.2mm 3.15mm
RS Stock No. 662-7169
Mfr. Part No.CD74HC4538PWR
HK$4.12
Each (In a Pack of 10)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
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