74AC648SC Equivalent & Substitute Parts

Part Overview

The 74AC648SC is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit bidirectional data transfer with 3-state output capability. This component operates across a 2V to 6V supply voltage range and is housed in a 24-SOP surface mount package. The product is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

74AC648SC

onsemiIn Stock: 98974AC648SC Datasheet

Current PartRFQ

MC74AC646DWG

onsemiIn Stock: 2069MC74AC646DWG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC648SC is determined by strict equivalence across the following critical parameters:

• Logic type and function: Non-inverting transceiver configuration
• Data width: 8-bit per element
• Output architecture: 3-state capability
• Output current drive: 24mA high and low
• Supply voltage range: 2V to 6V operation
• Package footprint: 24-pin SOIC form factor with 0.295" width and 7.50mm body dimension
• Operating temperature range: -40°C to 85°C

The MC74AC646DWG meets all these criteria and is identified as a parametric equivalent. Both parts share identical electrical specifications and mechanical compatibility, with differences limited to packaging format (tube vs. standard) and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The MC74AC646DWG is a direct parametric equivalent to the 74AC648SC. Both components are manufactured by onsemi, share identical electrical and mechanical specifications, and operate within the same environmental parameters. The primary distinction is packaging format: the 74AC648SC is supplied in standard packaging while the MC74AC646DWG is supplied in tube format.

Both parts carry obsolete product status and are subject to identical regulatory classifications (REACH Unaffected, EAR99 export control). The MC74AC646DWG carries RoHS3 compliance certification, whereas the 74AC648SC does not specify RoHS status. The MC74AC646DWG has a higher moisture sensitivity level (MSL 3, 168 hours) compared to the 74AC648SC (MSL 1, unlimited), which may impact storage and handling requirements in high-humidity environments.

For applications requiring the 74AC648SC, the MC74AC646DWG provides functional and mechanical interchangeability with consideration for the noted compliance and moisture sensitivity differences.

Frequently Asked Questions (FAQ)

Q: Can the MC74AC646DWG be used as a direct replacement for the 74AC648SC?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, output drive capability, supply voltage range, operating temperature range, and 24-SOIC package footprint. Pin-to-pin compatibility is maintained.

Q: What is the difference between the 74AC648SC and MC74AC646DWG?

A: The components are electrically and mechanically identical. Differences include packaging format (standard vs. tube), RoHS certification status (not specified vs. RoHS3 compliant), and moisture sensitivity level (MSL 1 vs. MSL 3).

Q: Does the higher MSL rating of the MC74AC646DWG affect compatibility?

A: MSL rating affects storage and handling procedures but does not impact electrical or mechanical compatibility. The MC74AC646DWG requires more stringent moisture control during storage and prior to soldering compared to the 74AC648SC.

Q: Are both parts still available for procurement?

A: Both parts are classified as obsolete. Availability is limited to existing inventory. The MC74AC646DWG has higher reported inventory levels (1980 pcs) compared to the 74AC648SC (880 pcs).

Q: What are the key parameters that determine substitution eligibility?

A: Substitution is based on matching logic type (non-inverting transceiver), data width (8-bit), output architecture (3-state), output current (24mA), supply voltage range (2V to 6V), operating temperature (-40°C to 85°C), and package footprint (24-SOIC, 0.295" width, 7.50mm body).