74HC85DB,118 Magnitude Comparator - Equivalent & Substitute Parts

Part Overview

The 74HC85DB,118 is a 4-bit magnitude comparator logic IC manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This component performs binary comparison operations, providing active-high outputs for A<B, A=B, and A>B conditions. The part is currently listed as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and component procurement.

Substiute Parts

74HC85DB,118

Nexperia USA Inc.In Stock: 83474HC85DB,118 Datasheet

Current PartRFQ

74HC85PW,118

Nexperia USA Inc.In Stock: 727074HC85PW,118 Datasheet

SimilarRFQ

CD74HC85PW

Texas InstrumentsIn Stock: 1585CD74HC85PW Datasheet

SimilarRFQ

CD74HC85PWR

Texas InstrumentsIn Stock: 4290CD74HC85PWR Datasheet

SimilarRFQ

CD74HC85PWT

Texas InstrumentsIn Stock: 1779CD74HC85PWT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC85DB,118 is determined by the following critical parameters:

• Functional equivalence: 4-bit magnitude comparator with identical output functions (A<B, A=B, A>B)
• Electrical compatibility: Supply voltage range 2V ~ 6V, output current 5.2mA, propagation delay 33ns @ 6V/50pF
• Logic family: 74HC series
• Operating temperature range: Must support -40°C ~ 125°C minimum
• Package compatibility: Surface mount packages (SSOP or TSSOP variants acceptable)
• Compliance: ROHS3 compliant, MSL 1

Substitute parts are grouped into two categories based on package type and manufacturer:

Group 1 - Nexperia (Same Manufacturer, Package Variant)

• 74HC85PW,118: 16-TSSOP package, active product status

Group 2 - Texas Instruments (Alternative Manufacturer, Extended Temperature)

• CD74HC85PW: 16-TSSOP package, discontinued at DiGi Electronics
• CD74HC85PWR: 16-TSSOP package, active product status
• CD74HC85PWT: 16-TSSOP package, discontinued at DiGi Electronics

All substitutes maintain identical electrical specifications and functional output characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: CD74HC85PWR

The CD74HC85PWR from Texas Instruments is the preferred substitute. This part maintains active product status, ensuring long-term availability and supply chain stability. It is supplied in Tape & Reel packaging and provides an extended operating temperature range of -55°C ~ 125°C, which exceeds the original specification. All electrical parameters and functional outputs remain identical to the 74HC85DB,118.

Secondary Recommendation: 74HC85PW,118

The 74HC85PW,118 from Nexperia USA Inc. is a direct functional equivalent with active product status. This option maintains the same manufacturer as the original part and is available in Tape & Reel packaging. The operating temperature range matches the original specification at -40°C ~ 125°C.

Package Consideration

Both recommended substitutes use the 16-TSSOP package (0.173", 4.40mm width) instead of the original 16-SSOP package (0.209", 5.30mm width). The TSSOP package is physically smaller and requires PCB layout adjustment. Verify PCB footprint compatibility before implementation.

Discontinued Parts

CD74HC85PW and CD74HC85PWT are listed as discontinued at DiGi Electronics and should not be selected for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 16-TSSOP package substitute on a PCB designed for 16-SSOP?

A: No. The 16-TSSOP and 16-SSOP packages have different physical dimensions and pin spacing. The TSSOP package is narrower (4.40mm vs 5.30mm). PCB footprint modification is required. Pin-to-pin functionality is identical, but the physical layout must be updated.

Q: What is the difference between the Nexperia and Texas Instruments versions?

A: Both manufacturers produce functionally identical 74HC85 magnitude comparators with the same electrical specifications. The primary differences are manufacturer origin and operating temperature range. Texas Instruments versions support -55°C ~ 125°C, while Nexperia versions support -40°C ~ 125°C. Both are ROHS3 compliant with MSL 1 rating.

Q: Why is the original 74HC85DB,118 listed as obsolete?

A: The 74HC85DB,118 in 16-SSOP packaging has been superseded by the more compact 16-TSSOP variant. The TSSOP package is the current industry standard for this logic family, offering improved space efficiency while maintaining identical functionality.

Q: Are all substitutes pin-compatible?

A: All listed substitutes are functionally equivalent with identical pin assignments for the 74HC comparator logic. However, physical package differences (SSOP vs TSSOP) require PCB footprint changes. Pin-to-pin electrical compatibility is confirmed across all substitutes.

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

A: CD74HC85PWR from Texas Instruments is recommended for long-term designs. It maintains active product status and is supplied in standard Tape & Reel packaging, ensuring consistent availability and supply chain support.

Q: Do I need to change my circuit design to use a substitute?

A: No circuit design changes are required. All substitutes maintain identical electrical specifications, output functions, and logic behavior. Only PCB layout modification is necessary to accommodate the package change from SSOP to TSSOP.