74F657SC Equivalent & Substitute Parts

Part Overview

The 74F657SC is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit data transmission with 3-state output capability. This component operates within a 4.5V to 5.5V supply voltage range and is housed in a 24-SOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

74F657SC

onsemiIn Stock: 85674F657SC Datasheet

Current PartRFQ

SN74F657DW

Texas InstrumentsIn Stock: 872SN74F657DW Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74F657SC is determined by strict alignment of the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)
• Package / Case: 24-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

The SN74F657DW from Texas Instruments meets all substitution criteria. Both parts share identical functional specifications, electrical operating parameters, and physical package dimensions. The primary distinction is product status: the 74F657SC is obsolete, while the SN74F657DW maintains active production status.

Parameter Comparison

Engineering Selection Recommendations

The SN74F657DW is the direct functional equivalent for the obsolete 74F657SC. Selection of the Texas Instruments part is supported by:

• Identical electrical and functional specifications across all critical parameters
• Active product status ensuring ongoing availability and supply chain continuity
• ROHS3 compliance, providing enhanced environmental and regulatory alignment
• Equivalent REACH status and ECCN classification
• Pin-compatible 24-SOIC package with identical mechanical dimensions

For applications currently using the 74F657SC, transition to the SN74F657DW requires no circuit modifications or design changes.

Frequently Asked Questions (FAQ)

Q: Can the SN74F657DW directly replace the 74F657SC without PCB modifications?

A: Yes. Both parts are pin-compatible with identical 24-SOIC package dimensions (0.295", 7.50mm Width) and surface mount configuration. No PCB layout changes are required.

Q: Are there electrical performance differences between these parts?

A: No. Both parts share identical output current specifications (3mA high, 24mA low), supply voltage range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C).

Q: Why is the 74F657SC listed as obsolete?

A: Obsolescence reflects the manufacturer's discontinuation of production. The SN74F657DW remains in active production and is the recommended alternative for new designs and ongoing system support.

Q: What is the significance of ROHS3 compliance on the SN74F657DW?

A: ROHS3 compliance indicates adherence to current environmental and hazardous substance restrictions, supporting regulatory requirements in many markets. The 74F657SC does not specify this certification.

Q: Are there packaging differences between the two parts?

A: Both parts use 24-SOIC surface mount packages with identical physical dimensions. The 74F657SC is supplied in -SOP packaging, while the SN74F657DW is supplied in Tube packaging. This reflects supplier packaging format only and does not affect electrical or mechanical compatibility.