74HC85DB,112 Magnitude Comparator - Equivalent & Substitute Parts

Part Overview

The 74HC85DB,112 is a 4-bit magnitude comparator manufactured by Nexperia USA Inc., designed to perform binary comparison operations with active high outputs for A<B, A=B, and A>B functions. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The 74HC logic family provides standard comparison functionality across multiple manufacturers, enabling direct functional substitution based on electrical and mechanical compatibility.

Substiute Parts

74HC85DB,112

Nexperia USA Inc.In Stock: 90074HC85DB,112 Datasheet

Current PartRFQ

CD74HC85PW

Texas InstrumentsIn Stock: 1585CD74HC85PW Datasheet

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CD74HC85PWR

Texas InstrumentsIn Stock: 4290CD74HC85PWR Datasheet

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CD74HC85PWT

Texas InstrumentsIn Stock: 1779CD74HC85PWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC85DB,112 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Electrical Parameters (Must Match):

• 4-bit magnitude comparator function
• Active high output configuration (A<B, A=B, A>B)
• Supply voltage range: 2V to 6V
• Output current capability: 5.2mA (high and low)
• Propagation delay: 33ns @ 6V, 50pF
• Quiescent current: 8 µA
• 74HC logic family classification

Mechanical Compatibility Considerations:

• Package type (16-SSOP or 16-TSSOP variants)
• Surface mount mounting type
• Pin count and pinout alignment

Compliance Requirements:

• ROHS3 compliance
• Moisture sensitivity level MSL 1 (Unlimited)

The substitute parts listed below maintain electrical equivalence while offering alternative packaging formats and manufacturer sources. Package variations (SSOP vs. TSSOP) represent different physical footprints but identical electrical performance and pinout.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CD74HC85PWR (Texas Instruments)

The CD74HC85PWR is the recommended substitute for the obsolete 74HC85DB,112. This part maintains full electrical equivalence across all critical parameters including supply voltage, output current, propagation delay, and quiescent current specifications. The CD74HC85PWR carries active product status at Texas Instruments, ensuring long-term availability and supply chain stability. The component is ROHS3 compliant and offers an extended operating temperature range (-55°C to 125°C) compared to the original part, providing additional thermal margin for demanding applications. Tape & Reel packaging format supports automated assembly processes.

Alternative Substitutes: CD74HC85PW and CD74HC85PWT (Texas Instruments)

Both CD74HC85PW and CD74HC85PWT provide electrical equivalence to the original part with identical performance specifications. These alternatives are discontinued at DiGi Electronics but remain available through alternative distribution channels. Both parts feature 16-TSSOP packaging, which differs physically from the original 16-SSOP package but maintains identical pinout and electrical function. Selection between these alternatives depends on packaging format requirements: CD74HC85PW is supplied in Tube format, while CD74HC85PWT is supplied in Tape & Reel format.

Package Consideration

The original 74HC85DB,112 uses 16-SSOP packaging (0.209" width), while all Texas Instruments substitutes use 16-TSSOP packaging (0.173" width). Both packages maintain identical pinout and electrical characteristics but differ in physical footprint. PCB layout modifications may be required when transitioning between these package types.

Frequently Asked Questions (FAQ)

Q: Can CD74HC85PWR directly replace 74HC85DB,112 in existing designs?

A: Yes. The CD74HC85PWR maintains electrical equivalence across all specified parameters: 4-bit magnitude comparator function, active high output configuration, 2V to 6V supply voltage range, 5.2mA output current, 33ns propagation delay, and 8 µA quiescent current. Pinout compatibility is confirmed. Package footprint differs (16-TSSOP vs. 16-SSOP), requiring PCB layout verification.

Q: What is the difference between 16-SSOP and 16-TSSOP packages?

A: Both packages contain 16 pins with identical pinout and electrical performance. The primary difference is physical footprint: 16-SSOP measures 0.209" width while 16-TSSOP measures 0.173" width. The TSSOP variant offers a smaller footprint suitable for space-constrained applications. Pin spacing and electrical characteristics remain identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 74HC85DB,112 and all listed substitute parts (CD74HC85PW, CD74HC85PWR, CD74HC85PWT) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Which substitute offers the best long-term availability?

A: The CD74HC85PWR carries active product status at Texas Instruments, providing the most reliable long-term availability and supply chain continuity. This part is the primary recommendation for new designs and production transitions.

Q: Do the substitute parts support the same operating temperature range?

A: The substitute parts support an extended operating temperature range of -55°C to 125°C, compared to the original part's -40°C to 125°C range. This provides additional thermal margin and is fully backward compatible with designs specified for the original temperature range.

Q: What packaging formats are available for substitutes?

A: CD74HC85PW is supplied in Tube format. CD74HC85PWR and CD74HC85PWT are supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume considerations.