SN74HC682DW Equivalent & Substitute Parts

Part Overview

The SN74HC682DW is an 8-bit magnitude comparator logic IC manufactured by Texas Instruments, housed in a 20-SOIC surface mount package. This device compares two 8-bit binary words and provides active-low outputs for equality (A=B) and greater-than (A>B) functions. The SN74HC682DW is designated as Last Time Buy, indicating end-of-life status. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring 8-bit magnitude comparison functionality.

Substiute Parts

SN74HC682DW

Texas InstrumentsIn Stock: 852SN74HC682DW Datasheet

Current PartRFQ

SN74HC682DWR

Texas InstrumentsIn Stock: 4350SN74HC682DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC682DW is determined by strict equivalence across the following critical parameters:

• Functional equivalence: 8-bit magnitude comparator with identical output logic (A=B, A>B active-low)
• Electrical specifications: Supply voltage range (2V–6V), output current ratings (5.2mA), and propagation delay (47ns @ 6V, 50pF)
• Package compatibility: 20-SOIC surface mount package with identical pinout and mechanical dimensions
• Environmental compliance: ROHS3 compliance, MSL Level 1, and REACH unaffected status
• Operating conditions: Temperature range -40°C to 85°C

The SN74HC682DWR qualifies as a direct substitute based on identical electrical, functional, and mechanical specifications. The only difference is packaging format: the DW variant uses Tube packaging, while the DWR variant uses Tape & Reel (TR) packaging. Both are manufactured by Texas Instruments and share the same base product number (74HC682).

Parameter Comparison

Engineering Selection Recommendations

The SN74HC682DWR is the direct substitute for the SN74HC682DW. Both parts are manufactured by Texas Instruments and maintain identical electrical, functional, and mechanical specifications. The SN74HC682DWR is preferred for new designs and ongoing production due to its Active product status, compared to the Last Time Buy designation of the SN74HC682DW. Both variants meet ROHS3 compliance and carry MSL Level 1 ratings, ensuring compatibility with standard surface mount assembly processes. The choice between Tube (DW) and Tape & Reel (DWR) packaging depends on production volume and assembly automation requirements; Tape & Reel packaging is standard for high-volume automated pick-and-place operations.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC682DWR directly replace the SN74HC682DW in existing designs?

A: Yes. The SN74HC682DWR is electrically and functionally identical to the SN74HC682DW. Both devices share the same 20-SOIC pinout, electrical specifications, and operating characteristics. No circuit modifications are required.

Q: What is the difference between the DW and DWR part number suffixes?

A: The suffix indicates packaging format only. DW denotes Tube packaging, while DWR denotes Tape & Reel (TR) packaging. The electrical and functional specifications are identical.

Q: Why is the SN74HC682DW marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments is discontinuing this part number. The SN74HC682DWR (Active status) is the recommended alternative for continued supply and future production.

Q: Are there any compliance or environmental differences between these parts?

A: No. Both the SN74HC682DW and SN74HC682DWR are ROHS3 compliant, carry MSL Level 1 ratings, and are REACH unaffected. They meet identical environmental and regulatory standards.

Q: What packaging format should I specify for high-volume production?

A: Tape & Reel (TR) packaging, represented by the SN74HC682DWR suffix, is standard for automated assembly lines. Tube packaging (DW) is suitable for lower-volume or manual assembly operations.

Q: Are the propagation delay and output current specifications identical?

A: Yes. Both parts specify 47ns maximum propagation delay at 6V with 50pF load, and 5.2mA output current for both high and low states. Timing and drive characteristics are identical.