SN74AHCT540DWRE4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT540DWRE4 is a logic buffer IC with inverting functionality, designed for 1 element with 8 bits per element and 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 20-SOIC surface mount package. The part is currently discontinued at DiGi Electronics, making identification of equivalent alternatives essential for ongoing system support and procurement planning.

Substiute Parts

SN74AHCT540DWRE4

Texas InstrumentsIn Stock: 754SN74AHCT540DWRE4 Datasheet

Current PartRFQ

SN74AHCT540DWR

Texas InstrumentsIn Stock: 3172SN74AHCT540DWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74AHCT540DWRE4 is determined by strict equivalence across the following critical parameters:

• Logic type and functional configuration (Buffer, Inverting)
• Element and bit-per-element count (1 element, 8 bits per element)
• Output type (3-State)
• Output current specifications (8mA, 8mA)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 125°C)
• Package type and physical dimensions (20-SOIC)
• Compliance certifications (ROHS3, REACH Unaffected)

The SN74AHCT540DWR meets all these criteria and is classified as a parametric equivalent. The primary distinction between the main part and its substitute is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74AHCT540DWR is a direct parametric equivalent to the SN74AHCT540DWRE4. Both parts share identical electrical specifications, thermal characteristics, and compliance certifications. The substitute part maintains active product status with Texas Instruments, ensuring continued availability and supply chain stability.

Selection of the SN74AHCT540DWR is appropriate for applications requiring the functional and electrical characteristics of the original part. The difference in packaging format (Tape & Reel versus unspecified) does not affect electrical performance or pin compatibility. Both parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74AHCT540DWR be used as a direct replacement for the SN74AHCT540DWRE4?

A: Yes. Both parts are electrically and functionally identical. They share the same logic type, output configuration, current ratings, supply voltage range, operating temperature range, and package dimensions. Pin-to-pin compatibility is maintained.

Q: What is the difference between the two part numbers?

A: The primary difference is packaging format. The SN74AHCT540DWRE4 uses an unspecified packaging format, while the SN74AHCT540DWR is supplied in Tape & Reel format. Additionally, the SN74AHCT540DWR maintains active product status, whereas the original part is discontinued at DiGi Electronics.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory compliance is equivalent.

Q: Does the 20-SOIC package remain the same for both parts?

A: Yes. Both parts use the 20-SOIC package with identical physical dimensions (0.295", 7.50mm Width). PCB footprints and assembly processes remain unchanged.

Q: What is the inventory status of the substitute part?

A: The SN74AHCT540DWR has 3100 pieces in stock as new original inventory, providing reliable supply availability compared to the discontinued original part.