74HC640D,652 Equivalent & Substitute Parts

Part Overview

The 74HC640D,652 is an inverting transceiver logic integrated circuit manufactured by NXP Semiconductors. This 20-SO surface mount device functions as a 1-element, 8-bit inverting transceiver with 3-state output capability, operating across a 2V to 6V supply voltage range. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement in legacy systems and new designs requiring compatible functionality.

Substiute Parts

74HC640D,652

NXP SemiconductorsIn Stock: 91974HC640D,652 Datasheet

Current PartRFQ

CD74HC640M

Harris CorporationIn Stock: 1976CD74HC640M Datasheet

UpgradeRFQ

SN74HC640DW

Texas InstrumentsIn Stock: 896SN74HC640DW Datasheet

MFR RecommendedRFQ

SN74HC640DWR

Texas InstrumentsIn Stock: 2674SN74HC640DWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC640D,652 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Electrical Parameters:

• Logic Type: Transceiver, Inverting (must match exactly)
• 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

Mechanical Parameters:

• Package / Case: 20-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Compliance Parameters:

• RoHS Status: ROHS3 Compliant (preferred for new designs)

All substitute parts listed maintain identical electrical specifications and package footprint compatibility with the original 74HC640D,652, ensuring direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

For New Designs and RoHS-Compliant Applications: SN74HC640DWR (Texas Instruments) is the primary selection. This part maintains active product status, carries ROHS3 compliance certification, and is available in Tape & Reel packaging for production volumes. The operating temperature range of -40°C to 85°C covers standard industrial and commercial applications.

For Extended Temperature Range Requirements: CD74HC640M (Harris Corporation) provides an extended upper operating temperature limit of 125°C, matching the original 74HC640D,652 specification. However, this part does not meet RoHS3 compliance requirements and carries obsolete product status.

For Legacy System Maintenance: SN74HC640DW (Texas Instruments) offers ROHS3 compliance with discontinued availability status, suitable for replacement in existing systems where component procurement remains feasible through inventory channels.

Frequently Asked Questions (FAQ)

Q: Can SN74HC640DWR directly replace 74HC640D,652 in existing designs? A: Yes. Both parts share identical electrical specifications (logic type, bit configuration, output type, current ratings, and supply voltage), identical package geometry (20-SOIC), and surface mount compatibility. The SN74HC640DWR maintains ROHS3 compliance and active product status.

Q: What is the difference between SN74HC640DW and SN74HC640DWR? A: Both are Texas Instruments parts with identical electrical and package specifications. The primary difference is packaging format: SN74HC640DW uses standard packaging, while SN74HC640DWR uses Tape & Reel (TR) format for automated assembly processes. Electrical performance is equivalent.

Q: Why does CD74HC640M show RoHS non-compliance? A: CD74HC640M does not meet ROHS3 certification requirements. For applications requiring RoHS compliance documentation, SN74HC640DWR or SN74HC640DW are appropriate selections.

Q: Are there operating temperature differences between substitute parts? A: Yes. The 74HC640D,652 and CD74HC640M operate from -40°C to 125°C. The Texas Instruments parts (SN74HC640DW and SN74HC640DWR) operate from -40°C to 85°C. For applications requiring the full -40°C to 125°C range, CD74HC640M is necessary, though RoHS compliance must be evaluated separately.

Q: Is the 20-SOIC package footprint identical across all substitute parts? A: Yes. All parts use the 20-SOIC package with 0.295" width and 7.50mm body width, ensuring identical PCB footprint compatibility and no layout modifications required.