SN74HC640PW Equivalent & Substitute Parts

Part Overview

The SN74HC640PW is a logic transceiver IC manufactured by Texas Instruments, designed for signal inversion and buffering applications. This device features 1 element with 8 bits per element, 3-state output capability, and operates across a 2V to 6V supply voltage range. The SN74HC640PW is classified as Last Time Buy, indicating discontinued production. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications currently utilizing this component.

Substiute Parts

SN74HC640PW

Texas InstrumentsIn Stock: 1615SN74HC640PW Datasheet

Current PartRFQ

SN74HC640PWR

Texas InstrumentsIn Stock: 8863SN74HC640PWR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC640PW is determined by strict equivalence across the following critical parameters:

• Logic Type: Transceiver, Inverting (functional equivalence)
• 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-TSSOP (0.173", 4.40mm Width)
• Mounting Type: Surface Mount
• Base Product Number: 74HC640

The SN74HC640PWR qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is packaging format: the main part is supplied in Tube packaging, while the substitute is supplied in Tape & Reel (TR) format. Both parts share the same base product number (74HC640) and are manufactured by Texas Instruments.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC640PWR is a direct functional and electrical equivalent to the SN74HC640PW. Both parts are manufactured by Texas Instruments and share identical electrical characteristics, pin configuration, and thermal specifications. The SN74HC640PWR maintains Active product status, ensuring continued availability and manufacturing support, whereas the SN74HC640PW is designated Last Time Buy.

Both parts comply with ROHS3 standards and carry identical moisture sensitivity ratings. The substitution is valid for all applications currently specified for the SN74HC640PW. The only operational difference is packaging format: Tube versus Tape & Reel. This distinction affects handling, storage, and automated assembly processes but does not impact electrical performance or functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC640PWR be used as a direct replacement for the SN74HC640PW?

A: Yes. Both parts are electrically and functionally identical. They share the same logic type, bit configuration, output characteristics, supply voltage range, operating temperature range, and 20-TSSOP package dimensions. The only difference is packaging format.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging supplies components in plastic tubes suitable for manual handling and small-quantity applications. Tape & Reel packaging supplies components on continuous tape wound on reels, optimized for automated pick-and-place assembly. Both formats contain the same component with identical electrical specifications.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the SN74HC640PW and SN74HC640PWR are ROHS3 compliant, carry identical REACH status, and share the same Moisture Sensitivity Level (MSL) rating of 1 (Unlimited).

Q: Why is the SN74HC640PW marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. The SN74HC640PWR, supplied in Tape & Reel format, remains in Active production status and is the recommended alternative for new designs and ongoing supply requirements.

Q: Will the SN74HC640PWR work in existing PCB designs specified for the SN74HC640PW?

A: Yes. The parts are pin-compatible and functionally identical. PCB designs, schematics, and firmware require no modification. The substitution is transparent at the circuit level.