SN74HC684NG4 Equivalent & Substitute Parts

Part Overview

The SN74HC684NG4 is an 8-bit magnitude comparator logic IC manufactured by Texas Instruments, designed for active-low output comparison operations (A=B, A>B functions). This component is packaged in a 20-pin DIP format and operates across a 2V to 6V supply voltage range.

The SN74HC684NG4 has been discontinued at DiGi Electronics. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring 8-bit magnitude comparison functionality.

Substiute Parts

SN74HC684NG4

Texas InstrumentsIn Stock: 1004SN74HC684NG4 Datasheet

Current PartRFQ

SN74HC684N

Texas InstrumentsIn Stock: 1145SN74HC684N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC684NG4 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 outputs)
• Electrical specifications: Matching supply voltage range (2V ~ 6V), output current ratings (5.2mA), and propagation delay characteristics (47ns @ 6V, 50pF)
• Package compatibility: 20-pin DIP form factor with identical pin configuration and through-hole mounting
• Compliance alignment: ROHS3 compliance and REACH unaffected status
• Series consistency: 74HC logic family designation

The SN74HC684N qualifies as a direct substitute based on identical electrical and functional parameters, with the primary distinction being product status (active vs. discontinued) and packaging format (tube vs. standard).

Parameter Comparison

Engineering Selection Recommendations

The SN74HC684N is the manufacturer-recommended substitute for the discontinued SN74HC684NG4. Both components maintain identical electrical performance, functional output characteristics, and compliance certifications (ROHS3, REACH unaffected). The SN74HC684N is currently in active production status, ensuring long-term availability and supply chain continuity.

The primary distinction between these parts is packaging format: the SN74HC684N is supplied in tube packaging, while the original SN74HC684NG4 used standard packaging. This difference does not affect electrical or functional compatibility in circuit applications. Both components are suitable for direct pin-for-pin replacement in 20-DIP through-hole PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC684N directly replace the SN74HC684NG4 in existing designs?

A: Yes. The SN74HC684N is electrically and functionally identical to the SN74HC684NG4. Both components share the same pin configuration, electrical specifications, output logic, and operating characteristics. Direct pin-for-pin replacement is supported.

Q: What is the difference between the SN74HC684NG4 and SN74HC684N?

A: The primary differences are product status and packaging format. The SN74HC684NG4 is discontinued; the SN74HC684N is in active production. The SN74HC684N is supplied in tube packaging, while the SN74HC684NG4 used standard packaging. Electrical and functional specifications are identical.

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

A: No. Both the SN74HC684NG4 and SN74HC684N maintain ROHS3 compliance and REACH unaffected status. Regulatory and environmental compliance is equivalent.

Q: What are the critical parameters for 8-bit magnitude comparator substitution?

A: Critical substitution parameters include bit count (8-bit), output logic type (active low), output functions (A=B, A>B), supply voltage range (2V ~ 6V), output current ratings (5.2mA), propagation delay (47ns @ 6V, 50pF), and package format (20-DIP through-hole). All parameters must match for functional equivalence.

Q: Is the 20-DIP package format critical for substitution?

A: Yes. The 20-DIP (0.300", 7.62mm) through-hole package format is essential for PCB compatibility. Alternative package formats would require circuit board redesign and are not considered direct substitutes.