SN74ALS990DW Equivalent & Substitute Parts

Part Overview

The SN74ALS990DW is a D-Type Transparent Latch logic IC manufactured by Texas Instruments, featuring a single 8:8 channel configuration with tri-state output capability. This component is classified as Last Time Buy, indicating discontinued production with limited availability. The identification of equivalent substitute parts is necessary to ensure design continuity and procurement feasibility for applications currently utilizing this logic latch in 20-SOIC surface mount packaging.

Substiute Parts

SN74ALS990DW

Texas InstrumentsIn Stock: 2260SN74ALS990DW Datasheet

Current PartRFQ

SN74ALS990DWR

Texas InstrumentsIn Stock: 2129SN74ALS990DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74ALS990DW is determined by strict equivalence across the following critical parameters:

• Logic Function: D-Type Transparent Latch with identical 8:8 channel configuration
• Electrical Specifications: Matching voltage supply range (4.5V ~ 5.5V), propagation delay (6ns), and output current ratings (400µA high, 8mA low)
• Output Characteristics: Tri-state output capability
• Package Specification: 20-SOIC surface mount package with identical physical dimensions
• Compliance Standards: ROHS3 compliance and MSL Level 1 rating

The SN74ALS990DWR qualifies as a direct substitute based on identical electrical performance, functional specification, and package configuration. The primary distinction is packaging format: the main part is supplied in Tube packaging (Last Time Buy status), while the substitute is supplied in Tape & Reel format (Active product status).

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS990DWR is the direct equivalent substitute for the SN74ALS990DW. Both components are manufactured by Texas Instruments and maintain identical electrical and functional specifications across all critical parameters. The substitution is supported by:

• Identical logic function and circuit configuration
• Matching electrical performance and timing characteristics
• Equivalent package specification and mounting compatibility
• Identical compliance certifications (ROHS3, MSL Level 1)

The primary consideration is product status: the SN74ALS990DW is Last Time Buy with limited inventory (2200 pcs), while the SN74ALS990DWR maintains Active status with current availability (2020 pcs). For new designs or replenishment procurement, the SN74ALS990DWR is the appropriate selection. The packaging format difference (Tube versus Tape & Reel) does not affect functional compatibility but may influence procurement quantity requirements and handling procedures.

Frequently Asked Questions (FAQ)

Q: Can the SN74ALS990DWR be used as a direct replacement for the SN74ALS990DW?

A: Yes. Both parts are electrically and functionally identical. They share the same logic type, circuit configuration, electrical specifications, and 20-SOIC package. The only difference is packaging format and product status.

Q: What is the significance of the Last Time Buy status on the SN74ALS990DW?

A: Last Time Buy indicates that Texas Instruments has discontinued production of this part number. Existing inventory is limited and will not be replenished. The SN74ALS990DWR, with Active status, is the recommended long-term source.

Q: Are there any compatibility concerns when switching from Tube to Tape & Reel packaging?

A: No compatibility concerns exist for the component itself. Both packaging formats contain identical die and lead configurations. The difference is in supply format: Tube packaging is typically used for smaller quantities, while Tape & Reel is standard for higher-volume production and automated assembly.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the SN74ALS990DW and SN74ALS990DWR are ROHS3 compliant with MSL Level 1 rating, REACH Unaffected status, and identical ECCN and HTSUS classifications.

Q: What are the critical parameters that define substitution eligibility?

A: Substitution is determined by matching logic type (D-Type Transparent Latch), circuit configuration (8:8), output type (Tri-State), voltage supply range (4.5V ~ 5.5V), propagation delay (6ns), output current ratings (400µA/8mA), operating temperature range (0°C ~ 70°C), and package specification (20-SOIC surface mount).