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. 526-701
Mfr. Part No.CD74HC123M
HK$4.594
Each (In a Tube of 40)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 436-3096
Mfr. Part No.SN54LS123J
HK$105.83
Each
units
LS Monostable Multivibrator 2 -0.4mA 4mA 40 ns 56 ns @ 5 V 12mA Through Hole CDIP 16 19.56 x 6.92 x 4.57mm 4.57mm 19.56mm
RS Stock No. 527-467
Mfr. Part No.CD14538BE
HK$3.821
Each (In a Tube of 25)
units
4000 Monostable Multivibrator 2 - - 30 ns 600 ns @ 5 V 0.1mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 168-5124
Mfr. Part No.SN54LS123J
HK$90.418
Each (In a Tube of 9)
units
LS Monostable Multivibrator 2 -0.4mA 4mA 40 ns 56 ns @ 5 V 12mA Through Hole CDIP 16 19.56 x 6.92 x 4.57mm 4.57mm 19.56mm
RS Stock No. 527-293
Mfr. Part No.CD4098BE
HK$4.007
Each (In a Tube of 25)
units
4000 Monostable Multivibrator 2 - - 20 ns 500 ns @ 5 V 0.02mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 662-8364
Mfr. Part No.SN74LS123DR
HK$6.696
Each (In a Pack of 5)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 56 ns @ 5 V 12mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 170-8064
Mfr. Part No.74HCT123D,652
BrandNexperia
HK$3.368
Each (In a Tube of 50)
units
74HCT Monostable Multivibrator 2 -4mA 4mA 30 ns 77 ns @ 50 pF - Surface Mount SO 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 922-2833
Mfr. Part No.SN74LS123DR
HK$2.51
Each (On a Reel of 2500)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 56 ns @ 5 V 12mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 145-1068
Mfr. Part No.SN74AHC123AD
HK$2.883
Each (In a Tube of 40)
units
AHC Monostable Multivibrator 2 -8mA 8mA 5 ns 24.1 ns @ 3.3 V 0.004mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
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. 653-2244
Mfr. Part No.BAS70-06W,115
BrandNexperia
HK$1.86
Each (In a Pack of 10)
units
- - 2 - - - - - Surface Mount UMT 3 1 x 2.2 x 1.35mm 1mm 2.2mm
RS Stock No. 186-9164
Mfr. Part No.MC100EL32DG
HK$52.53
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. 368-5654
Mfr. Part No.SN74121N
HK$30.29
Each (In a Tube of 25)
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. 662-7291
Mfr. Part No.CD74HCT221M96
HK$5.99
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. 528-078
Mfr. Part No.CD74HC4538M96
HK$3.183
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. 145-5799
Mfr. Part No.SN74LS122D
HK$9.75
Each (In a Tube of 50)
units
LS Monostable Multivibrator 1 -0.4mA 8mA 40 ns 56 ns @ 5 V 6mA Surface Mount SOIC 14 8.65 x 3.91 x 1.58mm 1.58mm 8.65mm
RS Stock No. 162-6965
Mfr. Part No.CD74HCT123M96
HK$1.263
Each (On a Reel of 2500)
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. 162-7430
Mfr. Part No.SN74LV221APWR
HK$4.979
Each (On a Reel of 2000)
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. 662-7169
Mfr. Part No.CD74HC4538PWR
HK$3.183
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
RS Stock No. 662-8461
Mfr. Part No.SN74LV221APWR
HK$11.47
Each (In a Pack of 5)
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
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