CD74HC85PWT Equivalent & Substitute Parts

Part Overview

The CD74HC85PWT is a 4-bit magnitude comparator manufactured by Texas Instruments, designed for digital logic applications requiring comparison of two 4-bit binary values. This device outputs three active-high signals indicating whether input A is less than, equal to, or greater than input B. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain identical electrical performance, package compatibility, and functional output characteristics.

Key Parameters

Parameter	Value
Type	Magnitude Comparator
Number of Bits	4
Output Type	Active High
Output Functions	A<B, A=B, A>B
Voltage Supply Range	2V to 6V
Output Current (High/Low)	5.2mA / 5.2mA
Max Propagation Delay	33ns @ 6V, 50pF
Quiescent Current	8 µA
Package	16-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC85PWT is determined by strict equivalence across the following critical parameters:

4-bit magnitude comparator architecture with identical output functions (A<B, A=B, A>B)
Active-high output configuration
Supply voltage range of 2V to 6V
Output current specifications of 5.2mA for both high and low states
Maximum propagation delay of 33ns at 6V with 50pF load
Quiescent current of 8 µA
16-TSSOP surface-mount package with 0.173" width (4.40mm)
ROHS3 compliance and MSL Level 1 rating

All identified substitutes meet these parameters without exception. Substitution is valid only when all electrical and mechanical specifications align with the original part.

Parameter Comparison

Parameter	CD74HC85PWT (Main)	CD74HC85PWR	74HC85PW,118 (Nexperia)
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.
Type	Magnitude Comparator	Magnitude Comparator	Magnitude Comparator
Number of Bits	4	4	4
Output Type	Active High	Active High	Active High
Output Functions	A<B, A=B, A>B	A<B, A=B, A>B	A<B, A=B, A>B
Voltage Supply	2V to 6V	2V to 6V	2V to 6V
Output Current (High/Low)	5.2mA / 5.2mA	5.2mA / 5.2mA	5.2mA / 5.2mA
Max Propagation Delay	33ns @ 6V, 50pF	33ns @ 6V, 50pF	33ns @ 6V, 50pF
Quiescent Current	8 µA	8 µA	8 µA
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-40°C to 125°C
Package	16-TSSOP	16-TSSOP	16-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active

Engineering Selection Recommendations

CD74HC85PWR (Texas Instruments) is the primary substitute for CD74HC85PWT. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and maintain the same operating temperature range of -55°C to 125°C. CD74HC85PWR is currently in active production status, ensuring long-term availability and supply chain continuity.

74HC85PW,118 (Nexperia USA Inc.) is an alternative substitute manufactured by Nexperia. This part meets all critical electrical and mechanical parameters. The operating temperature range is -40°C to 125°C, which represents a narrower lower temperature specification compared to the original part. This difference is acceptable for applications operating within the -40°C to 125°C window. Both substitute parts carry ROHS3 compliance and MSL Level 1 ratings, matching the original part's environmental and regulatory status.

Selection between CD74HC85PWR and 74HC85PW,118 should be based on supply availability, lead time requirements, and specific application temperature operating conditions.

Frequently Asked Questions (FAQ)

Q: Can CD74HC85PWR be used as a direct replacement for CD74HC85PWT?

A: Yes. CD74HC85PWR is a direct substitute. Both parts are 4-bit magnitude comparators with identical electrical specifications, output functions, supply voltage range, propagation delay, and 16-TSSOP package configuration. The primary difference is product status: CD74HC85PWR is in active production while CD74HC85PWT is discontinued.

Q: What is the difference between CD74HC85PWR and 74HC85PW,118?

A: Both parts are functionally equivalent 4-bit magnitude comparators with identical electrical performance and package specifications. The differences are manufacturer (Texas Instruments vs. Nexperia) and operating temperature range. CD74HC85PWR operates from -55°C to 125°C, while 74HC85PW,118 operates from -40°C to 125°C. Select based on your application's temperature requirements and supplier availability.

Q: Are all substitutes compatible with the same PCB layout?

A: Yes. All three parts use the 16-TSSOP package with identical pin configuration and 0.173" (4.40mm) width. No PCB layout modifications are required when substituting between these parts.

Q: Do the substitute parts have the same compliance certifications?

A: Yes. All parts are ROHS3 compliant, carry MSL Level 1 (Unlimited) moisture sensitivity rating, and have REACH Unaffected status. Compliance certifications are identical across all three parts.

Q: Which substitute should I select for new designs?

A: For new designs, either CD74HC85PWR or 74HC85PW,118 is acceptable. CD74HC85PWR offers the wider operating temperature range (-55°C to 125°C). Select based on your application's temperature requirements, supply chain preferences, and lead time availability.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message