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=BandQA<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=BandIA<B) to the least significant position must be connected as follows: IA<B=IA>B=LOW andIA=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.


  • 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 standard: no. 7A
    • 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

Target applications

  • Process controllers
  • Servo-motor control


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


Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
Reel 13" Q1/T1 CECCActive74HC85D74HC85D,653
( 9337 149 50653 )
Bulk Pack, CECCActive74HC85D74HC85D,652
( 9337 149 50652 )
Reel 13" Q1/T1ActiveHC8574HC85PW,118
( 9351 891 80118 )
Bulk PackActiveHC8574HC85PW,112
( 9351 891 80112 )
Reel 13" Q1/T1 CECCActive74HCT85D74HCT85D,653
( 9337 154 30653 )
Bulk Pack, CECCActive74HCT85D74HCT85D,652
( 9337 154 30652 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC85D74HC85D,65374HC85Dweek 30, 200484.96.621.51E811
74HC85D74HC85D,65274HC85Dweek 30, 200484.96.621.51E811
74HC85PW74HC85PW,11874HC85PWweek 10, 200584.96.621.51E811
74HC85PW74HC85PW,11274HC85PWweek 10, 200584.96.621.51E811
74HCT85D74HCT85D,65374HCT85Dweek 6, 200484.96.621.51E811
74HCT85D74HCT85D,65274HCT85Dweek 6, 200484.96.621.51E811
Quality and reliability disclaimer

Documentation (12)

File nameTitleTypeDate
74HC_HCT854-bit magnitude comparatorData sheet2018-04-23
SOT109-1_431SO16; Reel sulfur barrier pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-08-25
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm bodyOutline drawing2018-10-18
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT109-1_118SO16; Reel pack for SMD, 13"; Q1/T1 product orientationPacking2020-02-14
SOT403-1_118TSSOP16; Reel pack for SMD, 13"; Q1/T1 product orientationPacking2020-02-14
SOT403-1_623TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 623 or HL; Ordering code (12NC) ending 623Packing2013-05-15
SOT403-1_128TSSOP16; Reel pack; SMD, 13", Turned Q4/T2 180 deg product orientation Orderable part number ending ,128 or HP Ordering code (12NC) ending 128Packing2014-10-14
SOT403-1_653TSSOP16; Reel pack; SMD, 13"; Q1 Standard product orientation; Orderable part number ending, 653 or HL; Ordering code (12NC) ending 653Packing2013-05-15
SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyOutline drawing2018-11-14
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08


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