SN74AS645DW Equivalent & Substitute Parts Reference

Part Overview

The SN74AS645DW from Texas Instruments is a Logic category integrated circuit defined as a non-inverting transceiver with one element comprising eight bits, 3-state outputs, and a supply voltage range of 4.5V to 5.5V, contained within a 20-SOIC package. This device is classified as obsolete, necessitating the identification of suitable substitute models to ensure ongoing design reliability and supply continuity in applications requiring these characteristic parameters.

Substiute Parts

SN74AS645DW

Texas InstrumentsIn Stock: 1064SN74AS645DW Datasheet

Current PartRFQ

SN74AS245DW

Texas InstrumentsIn Stock: 973SN74AS245DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute grouping for SN74AS645DW is established strictly using the following key parameters: logic type, number of elements, number of bits per element, output type, output drive capability, supply voltage, operating temperature, mounting type, package/case, supplier device package, RoHS status, moisture sensitivity level (MSL), and REACH status. Only models meeting all specified parameters are designated as substitutes.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS645DW is obsolete, while the SN74AS245DW is active. Both parts meet ROHS3 compliance, share Moisture Sensitivity Level 1 (Unlimited), and are REACH unaffected. Engineering selections can be based on product status and environmental compliance as shown in the provided data.

Frequently Asked Questions (FAQ)

Q1: What are the main criteria for selecting a substitute for SN74AS645DW?
A1: Substitutes must match logic type, number of elements, number of bits per element, output type, output drive capability, voltage supply, temperature range, mounting type, package, and compliance certifications.

Q2: Are the SN74AS645DW and SN74AS245DW package-compatible?
A2: Both devices use the 20-SOIC (0.295", 7.50mm Width) package and have the same supplier device package, ensuring mechanical compatibility.

Q3: What environmental and compliance statuses should be considered in substitution?
A3: Both parts are ROHS3 compliant, moisture sensitivity level 1 (Unlimited), and REACH unaffected as per the provided specifications.

Q4: Can SN74AS245DW serve as a direct replacement for SN74AS645DW in terms of logic function and electrical characteristics?
A4: Based on provided parameters, both parts match in logic function, number of elements, output capabilities, voltage range, and all specified key characteristics.

Q5: Why is it necessary to consider substitute parts for SN74AS645DW?
A5: The SN74AS645DW is designated obsolete, requiring alternatives such as the SN74AS245DW to maintain supply chain and production continuity.