SN74LS85DRE4 Equivalent & Substitute Parts

Part Overview

The SN74LS85DRE4 is a 4-bit magnitude comparator logic IC manufactured by Texas Instruments in the 74LS series. This component performs binary comparison operations, outputting active-high signals for A<B, A=B, and A>B conditions. The SN74LS85DRE4 is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring this functional specification.

Substiute Parts

SN74LS85DRE4

Texas InstrumentsIn Stock: 965SN74LS85DRE4 Datasheet

Current PartRFQ

SN74LS85DR

Texas InstrumentsIn Stock: 5390SN74LS85DR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS85DRE4 is determined by strict equivalence across the following critical parameters:

• Functional Type: 4-bit magnitude comparator with active-high output
• Output Configuration: A<B, A=B, A>B comparison outputs
• Electrical Specifications: Supply voltage 4.75V ~ 5.25V, output current 400µA/8mA, propagation delay 45ns @ 5V with 15pF load
• Package: 16-SOIC surface mount form factor
• Temperature Range: 0°C ~ 70°C operating specification
• Compliance: ROHS3 compliant, REACH unaffected status

The SN74LS85DR qualifies as a direct substitute based on identical electrical performance, package specification, and compliance certifications. The primary distinction is product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS85DR is a direct functional and electrical equivalent to the SN74LS85DRE4. Both components maintain identical specifications across all critical parameters: 4-bit magnitude comparison functionality, active-high output configuration, supply voltage range, output current ratings, propagation delay characteristics, and operating temperature range.

The SN74LS85DR holds active product status with higher inventory availability, ensuring supply chain continuity. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current manufacturing standards.

The primary difference is packaging format: the SN74LS85DRE4 is supplied as individual units, while the SN74LS85DR is available in Tape & Reel format. This distinction affects procurement and assembly processes but does not impact electrical performance or functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS85DR directly replace the SN74LS85DRE4 in existing designs?

A: Yes. The SN74LS85DR is electrically and functionally identical to the SN74LS85DRE4. All comparison outputs, supply voltage specifications, output current ratings, propagation delay characteristics, and operating temperature ranges are equivalent. The 16-SOIC package and surface mount configuration are identical.

Q: What is the difference between the SN74LS85DRE4 and SN74LS85DR?

A: The components are functionally equivalent. The primary difference is packaging format: SN74LS85DRE4 is supplied as individual units, while SN74LS85DR is supplied in Tape & Reel format. Product status also differs, with SN74LS85DR currently active and SN74LS85DRE4 discontinued at DiGi Electronics.

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

A: No. Both the SN74LS85DRE4 and SN74LS85DR maintain identical ROHS3 compliance and REACH unaffected status. Moisture sensitivity level (MSL 1 - Unlimited) is the same for both parts.

Q: What are the critical parameters for substitution in 4-bit magnitude comparator applications?

A: Critical substitution parameters include: 4-bit comparison capability, active-high output configuration with A<B, A=B, A>B functions, supply voltage range 4.75V ~ 5.25V, output current specifications (400µA high, 8mA low), propagation delay (45ns @ 5V, 15pF load), operating temperature range (0°C ~ 70°C), and 16-SOIC surface mount package.

Q: Does the Tape & Reel packaging of the SN74LS85DR affect electrical performance?

A: No. Packaging format does not affect electrical performance, functional operation, or compatibility. Tape & Reel format is a supply and assembly consideration only.