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. 162-6914
Mfr. Part No.CD14538BPWR
HK$1.169
Each (On a Reel of 2000)
units
4000 Monostable Multivibrator 2 - - 30 ns 600 ns @ 5 V 0.1mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 146-0850
Mfr. Part No.74HCT4538D,112
BrandNexperia
HK$5.125
Each (In a Tube of 50)
units
HCT Monostable Multivibrator 2 -5.2mA 5.2mA 16 ns 90 ns @ 4.5 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 662-7658
Mfr. Part No.SN74AHC123APWR
HK$3.127
Each (In a Pack of 10)
units
AHC Monostable Multivibrator 2 -8mA 8mA 5 ns 24.1 ns @ 3.3 V 0.004mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
RS Stock No. 170-3571
Mfr. Part No.MC14528BDR2G
HK$1.906
Each (On a Reel of 2500)
units
MC Monostable Multivibrator 2 -0.36mA 2.4mA 10 μs 1000 ns @ 50 pF - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 162-6981
Mfr. Part No.CD74HCT4538M96
HK$2.283
Each (On a Reel of 2500)
units
HCT Monostable Multivibrator 2 -4mA 4mA 16 ns 55 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. 806-3295
Mfr. Part No.MC14528BDR2G
HK$4.47
Each (On a Tape of 20)
units
MC Monostable Multivibrator 2 -0.36mA 2.4mA 10 μs 1000 ns @ 50 pF - Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 162-6973
Mfr. Part No.CD74HCT221M96
HK$2.283
Each (On a Reel of 2500)
units
HCT Monostable Multivibrator 2 -4mA 4mA 14 ns 42 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. 528-078
Mfr. Part No.CD74HC4538M96
HK$3.963
Each (In a Pack of 25)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 145-6019
Mfr. Part No.SN74LV221AD
HK$11.652
Each (In a Tube of 40)
units
LV Monostable Multivibrator 2 -12mA 12mA 5 ns 36 ns @ 2.5 V 0.02mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 809-6273
Mfr. Part No.CD74HC221MT
HK$7.497
Each (On a Tape of 10)
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. 662-7291
Mfr. Part No.CD74HCT221M96
HK$5.87
Each (In a Pack of 5)
units
HCT Monostable Multivibrator 2 -4mA 4mA 14 ns 42 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. 151-3419
Mfr. Part No.74HC4538PW,118
BrandNexperia
HK$3.07
Each (In a Pack of 25)
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. 144-9936
Mfr. Part No.CD4047BEE4
HK$2.151
Each (In a Tube of 25)
units
4000 Monostable Multivibrator 1 - - 50 ns 1000 ns @ 5 V 0.02mA Through Hole PDIP 14 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 125-0045
Mfr. Part No.MC74HC4538ADG
HK$4.008
Each (In a Tube of 48)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 10 ns 295 ns @ 50 pF 0.35mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 186-9164
Mfr. Part No.MC100EL32DG
HK$53.71
Each (In a Pack of 2)
units
ECL Divider 2 - - - - - Surface Mount SOIC 8 5 x 4 x 1.5mm 1.5mm 5mm
RS Stock No. 170-5405
Mfr. Part No.74LVC1G123DP,125
BrandNexperia
HK$4.302
Each (In a Pack of 25)
units
74LVC Monostable Multivibrator 1 -32mA 32mA 2.5 ns 20.3 ns @ 50 pF 20µA Surface Mount TSSOP 8 3.1 x 3.1 x 0.95mm 0.95mm 3.1mm
RS Stock No. 791-8797
Mfr. Part No.74HCT4538D,112
BrandNexperia
HK$3.886
Each (In a Pack of 20)
units
HCT Monostable Multivibrator 2 -5.2mA 5.2mA 16 ns 90 ns@ 4.5 V 0.008mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 663-0385
Mfr. Part No.CD74HC4538EE4
HK$8.558
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 14 ns 250 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 171-3330
Mfr. Part No.74VHC221AFT
BrandToshiba
HK$0.796
Each (On a Reel of 2500)
units
74VHC Monostable Multivibrator 27 -8mA 8mA 5 ns 24.5ns 80µA Surface Mount TSSOP 16 5 x 4.4 x 1mm 1mm 5mm
RS Stock No. 540-0427
Mfr. Part No.TC74HC4538AP(F)
BrandToshiba
HK$10.87
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 250 ns @ 2 V 0.004mA Through Hole PDIP 16 19.25 x 6.4 x 3.5mm 3.5mm 19.25mm
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