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. 145-0420
Mfr. Part No.CD4047BM
HK$1.958
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. 162-6961
Mfr. Part No.CD74HC4538PWR
HK$2.184
Each (On a Reel of 2000)
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. 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. 662-7064
Mfr. Part No.CD74HC221PWR
HK$5.086
Each (In a Pack of 5)
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. 103-8390
Mfr. Part No.HEF4047BT,652
BrandNexperia
HK$2.574
Each (In a Tube of 57)
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. 171-3459
Mfr. Part No.74VHC221AFT
BrandToshiba
HK$1.613
Each (In a Pack of 50)
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. 153-1982
Mfr. Part No.74HC123PW-Q100,118
BrandNexperia
HK$1.215
Each (On a Reel of 2500)
units
74HC Monostable Multivibrator 2 -5.2mA 5.2mA 26 ns 385 ns @ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 151-3348
Mfr. Part No.74HC123PW,118
BrandNexperia
HK$1.088
Each (On a Reel of 2500)
units
HC Monostable Multivibrator 2 -4mA 4mA 26 ns 385 ns @ 15 pF - Surface Mount TSSOP16 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 688-1549
Mfr. Part No.MC14538BDR2G
HK$4.37
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 80 ns 600 ns @ 5 V 0.7mA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 601-4134
Mfr. Part No.TC4538BP(F)
BrandToshiba
HK$10.322
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 25 ns 760 ns @ 5 V 20mA Through Hole PDIP 16 19.25 x 6.4 x 3.5mm 3.5mm 19.25mm
RS Stock No. 186-8798
Mfr. Part No.74VHC123AM
HK$4.375
Each (In a Tube of 48)
units
VHC Monostable Multivibrator 8 -8mA 8mA 5 ns 29.5 ns @ 50 pF 40µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 145-0828
Mfr. Part No.SN74LS221N
HK$7.72
Each (In a Tube of 25)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 80 ns @ 5 V 4.7mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 368-5654
Mfr. Part No.SN74121N
HK$27.913
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. 146-0416
Mfr. Part No.74HCT123PW,112
BrandNexperia
HK$1.508
Each (In a Tube of 96)
units
HCT Monostable Multivibrator 1 -4mA 4mA 150 ns 385 ns @ 50 pF - Surface Mount TSSOP 16 5.1 x 4.5 x 0.95mm 0.95mm 5.1mm
RS Stock No. 145-1251
Mfr. Part No.SN74LV123APW
HK$2.899
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. 483-7979
Mfr. Part No.HEF4528BT,652
BrandNexperia
HK$4.616
Each (In a Pack of 10)
units
4000 Monostable Multivibrator 2 - - 20 ns 305 ns@ 5 V 0.08mA Surface Mount SOIC 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 164-6069
Mfr. Part No.LTC6993CS6-2#TRMPBF
HK$30.50
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. 809-5983
Mfr. Part No.SN74LVC1G123DCTR
HK$4.62
Each (In a Pack of 15)
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. 541-9308
Mfr. Part No.TC74HC423AF(F)
BrandToshiba
HK$10.754
Each (In a Pack of 5)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 13 ns 210 ns @ 2 V 0.004mA Surface Mount SOP 16 10.3 x 5.3 x 1.5mm 1.5mm 10.3mm
RS Stock No. 662-7008
Mfr. Part No.CD74HC123PWR
HK$3.17
Each (In a Pack of 10)
units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Surface Mount TSSOP 16 5 x 4.4 x 1.15mm 1.15mm 5mm
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