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 (Q_A>B, Q_A=B and Q_A<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 (I_A>B, I_A=B and I_A<B) to the least significant position must be connected as follows: I_A<B = I_A>B = LOW and I_A=B = HIGH. For words greater than 4-bits, units can be cascaded by connecting outputs Q_A>B, Q_A=B and Q_A<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 V_CC.

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: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V
- CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Applications

Process controllers
Servo-motor control

Parametrics

Type number	Product status	V_CC (V)	Logic switching levels	Output drive capability (mA)	t_pd (ns)	Nr of bits	Power dissipation considerations	T_amb (°C)	R_th(j-a) (K/W)	Ψ_th(j-top) (K/W)	R_th(j-c) (K/W)	Package name
74HC85D	Production	2.0 - 6.0	CMOS	± 5.2	23	4	low	-40~125	67	1.0	25	SO16
74HC85PW	Production	2.0 - 6.0	CMOS	± 5.2	23	4	low	-40~125	102	1.0	28.7	TSSOP16
74HCT85D	Production	4.5 - 5.5	TTL	± 4	26	4	low	-40~125	67	1.0	24.8	SO16
74HCT85PW	Production	4.5 - 5.5	TTL	± 4	26	4	low	-40~125	-	-	-	TSSOP16

Package

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC85D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_653	Active	74HC85D	74HC85D,653 ( 9337 149 50653 )
74HC85PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_118	Active	HC85	74HC85PW,118 ( 9351 891 80118 )
74HCT85D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_653	Active	74HCT85D	74HCT85D,653 ( 9337 154 30653 )
74HCT85PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_118	Active	74HCT85	74HCT85PWHL ( 9356 912 06118 )

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

Type number	Package	Package information	Reflow-/Wave soldering	Packing	Status	Marking	Orderable part number, (Ordering code (12NC))
74HC85D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_652	Withdrawn / End-of-life	74HC85D	74HC85D,652 ( 9337 149 50652 )
74HC85PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	SOT403-1_112	Withdrawn / End-of-life	HC85	74HC85PW,112 ( 9351 891 80112 )
74HCT85D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	SOT109-1_652	Withdrawn / End-of-life	74HCT85D	74HCT85D,652 ( 9337 154 30652 )

Discontinuation information

Type number	Orderable part number, (Ordering code (12NC))	Last time buy date	Last time delivery date	Replacement product
74HC85D	933714950652	2021-12-31	2022-06-30	74HC85D
74HC85PW	935189180112	2021-12-31	2022-06-30	74HC85PW
74HCT85D	933715430652	2021-12-31	2022-06-30	74HCT85D

Environmental information

Type number	Orderable part number	Chemical content	Leadfree conversion date
74HC85D	74HC85D,653	74HC85D	week 30, 2004
74HC85PW	74HC85PW,118	74HC85PW	week 10, 2005
74HCT85D	74HCT85D,653	74HCT85D	week 6, 2004
74HCT85PW	74HCT85PWHL	74HCT85PW

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

Type number	Orderable part number	Chemical content	Leadfree conversion date
74HC85D	74HC85D,652	74HC85D	week 30, 2004
74HC85PW	74HC85PW,112	74HC85PW	week 10, 2005
74HCT85D	74HCT85D,652	74HCT85D	week 6, 2004

Quality and reliability disclaimer

Documentation (7)

File name	Title	Type	Date
74HC_HCT85	4-bit magnitude comparator	Data sheet	2024-04-02
SO-SOJ-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SO-SOJ-REFLOW	Footprint for reflow soldering	Reflow soldering	2009-10-08
WAVE_BG-BD-1	Wave soldering profile	Wave soldering	2021-09-08
SOT109-1	plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm body	Package information	2023-11-07
SOT403-1	plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.2 mm body	Package information	2023-11-08
SSOP-TSSOP-VSO-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08

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