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. 781-2863
Mfr. Part No.74HCT221D,652
BrandNexperia
HK$5.647
Each (In a Pack of 10)
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. 178-6982
Mfr. Part No.HEF4528BT,652
BrandNexperia
HK$2.595
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. 760-3397
Mfr. Part No.LTC6993CS6-1#TRMPBF
HK$36.48
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. 663-2678
Mfr. Part No.SN74LV123APW
HK$4.228
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
RS Stock No. 688-1549
Mfr. Part No.MC14538BDR2G
HK$4.36
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. 663-2460
Mfr. Part No.SN74LS221D
HK$10.572
Each (In a Pack of 5)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 80 ns @ 5 V 4.7mA Surface Mount SOIC 16 9.9 x 3.91 x 1.58mm 1.58mm 9.9mm
RS Stock No. 601-4128
Mfr. Part No.TC4538BF(F)
BrandToshiba
HK$8.972
Each (In a Pack of 5)
units
4000 Monostable Multivibrator 2 - - 25 ns 760 ns @ 5 V 20mA Surface Mount SOP 16 10.3 x 5.3 x 1.5mm 1.5mm 10.3mm
RS Stock No. 663-2735
Mfr. Part No.SN74LV221AD
HK$11.49
Each (In a Pack of 5)
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. 662-6594
Mfr. Part No.74LVC1G123DCTT
HK$8.254
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. 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. 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
New
RS Stock No. 186-8851
Mfr. Part No.MC14521BDG
HK$5.62
Each (In a Tube of 48)
units
- Frequency Divider - - - 120 ns 2600 ns @ 50 pF 150µA Surface Mount SOIC 16 10 x 4 x 1.5mm 1.5mm 10mm
RS Stock No. 662-8461
Mfr. Part No.SN74LV221APWR
HK$10.194
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
New
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. 355-8861
Mfr. Part No.HEF4047BT,652
BrandNexperia
HK$4.47
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. 527-647
Mfr. Part No.CD74HC4538E
HK$4.40
Each (In a Tube of 25)
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. 170-8002
Mfr. Part No.HEF4538BT,653
BrandNexperia
HK$1.35
Each (On a Reel of 2500)
units
HEF Monostable Multivibrator 2 -2.4mA 2.4mA 90 ns 460 ns @ 50 pF - Surface Mount SO 16 10 x 4 x 1.45mm 1.45mm 10mm
RS Stock No. 483-7979
Mfr. Part No.HEF4528BT,652
BrandNexperia
HK$3.461
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. 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. 662-9635
Mfr. Part No.CD4047BM
HK$3.792
Each (In a Pack of 5)
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
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