Monostable Multivibrators

Monostable multivibrators, also known as one-shot multivibrators, are a type of IC (integrated 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. This type of IC can also be considered as a 1/2 astable type multivibrator.

What are monostable multivibrators used for?

This type of IC is 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 a monostable multivibrator, they are;

  • Retriggerable monostable multivibrators will remain in the unstable state with repeated application of the trigger pulse.
  • Non-re-triggerable 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$5.072
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. 527-467
Mfr. Part No.CD14538BE
HK$4.652
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. 436-3096
Mfr. Part No.SN54LS123J
HK$134.23
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. 168-5124
Mfr. Part No.SN54LS123J
HK$111.763
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. 662-8364
Mfr. Part No.SN74LS123DR
HK$7.192
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. 922-2833
Mfr. Part No.SN74LS123DR
HK$2.585
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. 527-293
Mfr. Part No.CD4098BE
HK$5.008
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. 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. 162-6914
Mfr. Part No.CD14538BPWR
HK$1.37
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. 162-7430
Mfr. Part No.SN74LV221APWR
HK$5.037
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. 663-2678
Mfr. Part No.SN74LV123APW
HK$5.644
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. 368-5660
Mfr. Part No.SN74123N
HK$41.076
Each (In a Tube of 25)
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. 662-7658
Mfr. Part No.SN74AHC123APWR
HK$3.476
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. 662-6796
Mfr. Part No.CD14538BPWR
HK$4.494
Each (In a Pack of 5)
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. 923-2350
Mfr. Part No.SN74LS123N
HK$6.918
Each (In a Tube of 25)
units
LS Monostable Multivibrator 2 -0.4mA 8mA 40 ns 56 ns @ 5 V 12mA Through Hole PDIP 16 19.3 x 6.35 x 4.57mm 4.57mm 19.3mm
RS Stock No. 306-471
Mfr. Part No.SN74123N
HK$52.21
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. 709-2071
Mfr. Part No.CD74HC123E
HK$5.386
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. 921-2808
Mfr. Part No.SN74LVC1G123DCTR
HK$1.883
Each (On a Reel of 3000)
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. 162-6864
Mfr. Part No.SN74LVC1G123DCTT
HK$7.44
Each (On a Reel of 250)
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. 527-647
Mfr. Part No.CD74HC4538E
HK$6.73
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