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. 145-1086
Mfr. Part No.CD74HC123E
kr 3,218
Each (In a Tube of 25)
Units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 709-2071
Mfr. Part No.CD74HC123E
kr 4,806
Each (In a Pack of 5)
Units
HC Monostable Multivibrator 2 -5.2mA 5.2mA 17 ns 320 ns @ 2 V 0.008mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 305-591
Mfr. Part No.SN74121N
kr 36,89
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. 368-5654
Mfr. Part No.SN74121N
kr 30,764
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. 807-2583
Mfr. Part No.SN74AHCT123AN
kr 4,299
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. 170-3421
Mfr. Part No.MC14538BDR2G
kr 1,505
Each (On a Reel of 2500)
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. 662-7226
Mfr. Part No.CD74HCT123M96
kr 0,913
Each (In a Pack of 10)
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
kr 5,702
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. 662-7658
Mfr. Part No.SN74AHC123APWR
kr 2,891
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. 171-3330
Mfr. Part No.74VHC221AFT
BrandToshiba
kr 0,826
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. 528-078
Mfr. Part No.CD74HC4538M96
kr 3,071
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. 306-471
Mfr. Part No.SN74123N
kr 51,25
Each
Units
74 Monostable Multivibrator 2 -0.8mA 16mA 40 ns 40 ns @ 5 V 46mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 662-7169
Mfr. Part No.CD74HC4538PWR
kr 3,151
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. 145-1068
Mfr. Part No.SN74AHC123AD
kr 3,976
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. 145-5995
Mfr. Part No.CD4098BM
kr 4,085
Each (In a Tube of 40)
Units
4000 Monostable Multivibrator 2 - - 20 ns 500 ns @ 5 V 0.02mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 178-6982
Mfr. Part No.HEF4528BT,652
BrandNexperia
kr 4,534
Each (In a Tube of 50)
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. 151-3398
Mfr. Part No.74HC123PW,118
BrandNexperia
kr 2,901
Each (In a Pack of 50)
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. 178-8815
Mfr. Part No.CD74HC123PWR
kr 4,431
Each (In a Tube of 90)
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
RS Stock No. 146-0850
Mfr. Part No.74HCT4538D,112
BrandNexperia
kr 5,019
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. 186-9200
Mfr. Part No.MC14521BDG
kr 6,233
Each (In a Pack of 25)
Units
- Frequency Divider - - - 120 ns 2600 ns @ 50 pF 150µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
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