SN74HC640DW Equivalent & Substitute Parts

Part Overview

The SN74HC640DW is a logic transceiver IC manufactured by Texas Instruments, designed for inverting signal conversion with 1 element and 8 bits per element. The device features 3-state output capability and operates across a 2V to 6V supply voltage range, making it suitable for digital logic applications requiring signal inversion and bus control.

The SN74HC640DW is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

SN74HC640DW

Texas InstrumentsIn Stock: 896SN74HC640DW Datasheet

Current PartRFQ

SN74HC640DWR

Texas InstrumentsIn Stock: 2674SN74HC640DWR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC640DW is determined by strict equivalence across the following critical parameters:

• Logic Type: Transceiver, Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 7.8mA, 7.8mA
• Voltage - Supply: 2V ~ 6V
• Operating Temperature: -40°C ~ 85°C (TA)
• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• Base Product Number: 74HC640

The SN74HC640DWR qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is packaging format: the SN74HC640DW is supplied in tube packaging, while the SN74HC640DWR is supplied in Tape & Reel (TR) format.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC640DWR is the direct functional equivalent of the SN74HC640DW. Both parts share identical electrical characteristics, thermal specifications, and mechanical compatibility within the 20-SOIC package footprint.

The SN74HC640DWR maintains active product status with Texas Instruments, ensuring continued availability and supply chain reliability. Both parts meet ROHS3 compliance and REACH requirements, supporting regulatory and environmental standards.

The selection between these parts depends on procurement requirements: the SN74HC640DWR in Tape & Reel format is suitable for automated assembly and high-volume production environments, while the SN74HC640DW in tube packaging is appropriate for lower-volume or manual assembly applications. From an electrical and mechanical standpoint, either part provides equivalent performance in the target application.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC640DWR directly replace the SN74HC640DW in existing designs?

A: Yes. The SN74HC640DWR is electrically and mechanically equivalent to the SN74HC640DW. Both parts feature identical logic functionality, output characteristics, supply voltage range, and 20-SOIC package dimensions. No design modifications are required for substitution.

Q: What is the difference between the SN74HC640DW and SN74HC640DWR?

A: The primary difference is packaging format. The SN74HC640DW is supplied in tube packaging, while the SN74HC640DWR is supplied in Tape & Reel (TR) format. All electrical and mechanical specifications are identical.

Q: Are there any compatibility concerns when switching from SN74HC640DW to SN74HC640DWR?

A: No compatibility concerns exist. Both parts are pin-compatible and functionally equivalent. The 20-SOIC package footprint is identical, and all electrical parameters match precisely.

Q: Why is the SN74HC640DW discontinued while the SN74HC640DWR remains active?

A: Tape & Reel packaging (SN74HC640DWR) is the standard format for high-volume manufacturing and automated assembly. Tube packaging (SN74HC640DW) is typically phased out as manufacturers consolidate to more efficient distribution formats.

Q: What compliance certifications apply to substitute parts?

A: Both the SN74HC640DW and SN74HC640DWR are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.