SN74ALS992NT Equivalent & Substitute Parts

Part Overview

The SN74ALS992NT is a D-Type Transparent Latch IC manufactured by Texas Instruments, featuring a 9:9 circuit configuration with tri-state output capability. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates within the 74ALS logic family and is housed in a 24-DIP through-hole package.

Substiute Parts

SN74ALS992NT

Texas InstrumentsIn Stock: 1054SN74ALS992NT Datasheet

Current PartRFQ

SN74ALS992DW

Texas InstrumentsIn Stock: 1079SN74ALS992DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74ALS992NT is determined by strict equivalence across the following critical parameters:

• Logic Type: D-Type Transparent Latch (identical function)
• Circuit Configuration: 9:9 (identical bit width and channel count)
• Output Type: Tri-State (identical output capability)
• Supply Voltage: 4.5V ~ 5.5V (identical operating range)
• Independent Circuits: 1 (identical channel count)
• Propagation Delay: 6ns (identical timing specification)
• Output Current Ratings: 400µA / 8mA (identical drive capability)
• Operating Temperature: 0°C ~ 70°C (identical thermal range)
• Series: 74ALS (identical logic family)
• Compliance: ROHS3 Compliant, REACH Unaffected (identical regulatory status)

The SN74ALS992DW qualifies as a direct functional equivalent based on complete parameter alignment. The primary distinction is packaging format: the main part uses through-hole mounting (24-DIP), while the substitute employs surface-mount technology (24-SOIC).

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS992DW is the direct functional equivalent for the obsolete SN74ALS992NT. Both components maintain identical electrical specifications, timing characteristics, and regulatory compliance status. Selection between these parts is determined by PCB assembly methodology and design constraints:

• Through-hole assembly requirements necessitate the SN74ALS992NT, though procurement may be limited due to obsolete status.
• Surface-mount assembly processes support the SN74ALS992DW, which carries active product status and improved availability.

Both parts satisfy ROHS3 compliance and REACH regulatory requirements. The SN74ALS992DW is recommended for new designs and redesigns of legacy systems where PCB assembly technology permits surface-mount implementation.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS992DW directly replace the SN74ALS992NT in existing designs?

A: Electrical and functional replacement is complete. Physical replacement requires PCB redesign to accommodate the different package format (24-SOIC versus 24-DIP). Pin-to-pin functionality is identical.

Q: What is the primary reason for seeking substitutes for the SN74ALS992NT?

A: The SN74ALS992NT is classified as obsolete. The SN74ALS992DW maintains active product status, ensuring long-term availability and supply chain continuity.

Q: Are there differences in thermal or electrical performance between these parts?

A: No. Both components operate within identical voltage ranges (4.5V ~ 5.5V), maintain the same propagation delay (6ns), and support identical output current specifications (400µA / 8mA).

Q: What packaging considerations apply to substitution?

A: The SN74ALS992NT uses 24-DIP through-hole packaging (0.300", 7.62mm). The SN74ALS992DW uses 24-SOIC surface-mount packaging (0.295", 7.50mm Width). PCB layout and assembly process compatibility must be evaluated.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the SN74ALS992NT and SN74ALS992DW are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.