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74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

The 74HC123; 74HCT123 is a dual retriggerable monostable multivibrator with reset. The basic output pulse width is programmed by selection of external components (REXT and CEXT). Once triggered this basic pulse width may be extended by retriggering either of the edge triggered inputs (nA or nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times.

Features and benefits

  • Wide supply voltage range from 2.0 V to 6.0 V
  • CMOS low power dissipation
  • High noise immunity
  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
  • Complies with JEDEC standards:
    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)
  • Input levels:
    • For 74HC123: CMOS level
    • For 74HCT123: TTL level
  • DC triggered from active HIGH or active LOW inputs
  • Retriggerable for very long pulses up to 100 % duty factor
  • Direct reset terminates output pulse
  • Schmitt-trigger action on all inputs except for the reset input
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Multiple package options
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC123BQProduction2.0 - 6.0CMOS± 7.89.0low-40~1259011.859DHVQFN16
74HC123DProduction2.0 - 6.0CMOS± 5.226low-40~125908.349SO16
74HC123PWProduction2.0 - 6.0CMOS± 5.226low-40~1251223.951.5TSSOP16
74HCT123DProduction4.5 - 5.5TTL± 426low-40~125908.349SO16
74HCT123PWProduction4.5 - 5.5TTL± 426low-40~1251223.951.5TSSOP16

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC123BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7” Q1/T1 or Q2/T3ActiveHC12374HC123BQ,115
( 9352 824 53115 )
74HC123D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC123D74HC123D,653
( 9337 139 60653 )
74HC123PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC12374HC123PW,118
( 9351 868 60118 )
74HCT123D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HCT123D74HCT123D,653
( 9337 139 70653 )
74HCT123PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHCT12374HCT123PW,118
( 9351 868 50118 )

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC123D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HC123D74HC123D,652
( 9337 139 60652 )
74HC123PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHC12374HC123PW,112
( 9351 868 60112 )
74HCT123D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HCT123D74HCT123D,652
( 9337 139 70652 )
74HCT123PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHCT12374HCT123PW,112
( 9351 868 50112 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC123D933713960652
74HC123PW935186860112
74HCT123D933713970652
74HCT123PW935186850112

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC123BQ74HC123BQ,11574HC123BQAlways Pb-free39.31.37.69E811
74HC123D74HC123D,65374HC123Dweek 30, 200439.31.37.69E811
74HC123PW74HC123PW,11874HC123PWweek 10, 200539.31.37.69E811
74HCT123D74HCT123D,65374HCT123Dweek 6, 200439.31.37.69E811
74HCT123PW74HCT123PW,11874HCT123PWweek 10, 200539.31.37.69E811

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC123D74HC123D,65274HC123Dweek 30, 200439.31.37.69E811
74HC123PW74HC123PW,11274HC123PWweek 10, 200539.31.37.69E811
74HCT123D74HCT123D,65274HCT123Dweek 6, 200439.31.37.69E811
74HCT123PW74HCT123PW,11274HCT123PWweek 10, 200539.31.37.69E811
Quality and reliability disclaimer

Documentation (11)

File nameTitleTypeDate
74HC_HCT123Dual retriggerable monostable multivibrator with resetData sheet2021-08-11
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
hchc Spice modelSPICE model2013-05-06
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SOT763-1plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 1 mm bodyPackage information2020-04-21
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2021-01-06
WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyPackage information2020-04-21

Support

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Models

File nameTitleTypeDate
hchc Spice modelSPICE model2013-05-06

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