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74HC85; 74HCT85

4-bit magnitude comparator

The 74HC85; 74HCT85 is a 4-bit magnitude comparator that can be expanded to almost any length. They perform comparison of two 4-bit binary, BCD or other monotonic codes and present the three possible magnitude results at the outputs (QA>B, QA=B and QA<B). The 4-bit inputs are weighted (A0 to A3 and B0 to B3), where A3 and B3 are the most significant bits. For proper compare operation the expander inputs (IA>B, IA=B and IA<B) to the least significant position must be connected as follows: IA<B = IA>B = LOW and IA=B = HIGH. For words greater than 4-bits, units can be cascaded by connecting outputs QA>B, QA=B and QA<B to the corresponding inputs of the significant comparator. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

  • Wide supply voltage range from 2.0 to 6.0 V
  • CMOS low power dissipation
  • High noise immunity
  • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
  • Input levels:
    • For 74HC85: CMOS level
    • For 74HCT85: TTL level
  • Complies with JEDEC standards:
    • JESD8C (2.7 V to 3.6 V)
    • JESD7A (2.0 V to 6.0 V)
  • ESD protection:
    • HBM JESD22-A114-A exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Applications

  • Process controllers
  • Servo-motor control

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)No of bitsPower dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC85DProduction2.0 - 6.0CMOS± 5.2234low-40~125671.025SO16
74HC85PWProduction2.0 - 6.0CMOS± 5.2234low-40~1251021.028.7TSSOP16
74HCT85DProduction4.5 - 5.5TTL± 4264low-40~125671.024.8SO16
74HCT85PWProduction4.5 - 5.5TTL± 4264low-40~125---TSSOP16

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC85D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC85D74HC85D,653
( 9337 149 50653 )
74HC85PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1ActiveHC8574HC85PW,118
( 9351 891 80118 )
74HCT85D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HCT85D74HCT85D,653
( 9337 154 30653 )
74HCT85PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1Active74HCT8574HCT85PWHL
( 9356 912 06118 )

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))
74HC85D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HC85D74HC85D,652
( 9337 149 50652 )
74HC85PW
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Bulk PackDiscontinued / End-of-lifeHC8574HC85PW,112
( 9351 891 80112 )
74HCT85D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Bulk Pack, CECCDiscontinued / End-of-life74HCT85D74HCT85D,652
( 9337 154 30652 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC85D9337149506522021-12-312022-06-3074HC85D
    74HC85PW9351891801122021-12-312022-06-3074HC85PW
      74HCT85D9337154306522021-12-312022-06-3074HCT85D

        Quality, reliability & chemical content

        Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
        74HC85D74HC85D,65374HC85Dweek 30, 200439.31.37.69E811
        74HC85PW74HC85PW,11874HC85PWweek 10, 200539.31.37.69E811
        74HCT85D74HCT85D,65374HCT85Dweek 6, 200439.31.37.69E811
        74HCT85PW74HCT85PWHL74HCT85PW39.31.37.69E811

        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
        74HC85D74HC85D,65274HC85Dweek 30, 200439.31.37.69E811
        74HC85PW74HC85PW,11274HC85PWweek 10, 200539.31.37.69E811
        74HCT85D74HCT85D,65274HCT85Dweek 6, 200439.31.37.69E811
        Quality and reliability disclaimer

        Documentation (7)

        File nameTitleTypeDate
        74HC_HCT854-bit magnitude comparatorData sheet2021-08-04
        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

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