74FST3257MN2TWG Equivalent & Substitute Parts

Part Overview

The 74FST3257MN2TWG is a Multiplexer/Demultiplexer logic integrated circuit manufactured by onsemi, configured as a 4 x 2:1 circuit in a 16-QFN (2.5x3.5) surface mount package. This component is designated as Last Time Buy, indicating discontinued production with limited availability. Identification of equivalent and substitute parts is necessary to ensure design continuity and procurement flexibility for applications requiring this multiplexer/demultiplexer functionality.

Substiute Parts

74FST3257MN2TWG

onsemiIn Stock: 373674FST3257MN2TWG Datasheet

Current PartRFQ

74FST3257MNTWG

onsemiIn Stock: 1628074FST3257MNTWG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74FST3257MN2TWG is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Circuit configuration: 4 x 2:1 multiplexer/demultiplexer
• Independent circuits: 1
• Voltage supply range: 4V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C
• Single supply operation

Mechanical Equivalence Criteria:

• Package type: 16-VFQFN Exposed Pad
• Package dimensions: 16-QFN (2.5x3.5)
• Mounting type: Surface Mount

Compliance Equivalence Criteria:

• RoHS3 Compliance
• REACH Unaffected status
• Moisture Sensitivity Level 1

The substitute part 74FST3257MNTWG meets all electrical, mechanical, and compliance parameters specified for the main part number 74FST3257MN2TWG.

Parameter Comparison

Engineering Selection Recommendations

The 74FST3257MNTWG is a direct parametric equivalent to the 74FST3257MN2TWG. Both components share identical electrical specifications, mechanical packaging, and regulatory compliance status. Selection between these parts is based on inventory availability and procurement requirements.

Given that both parts carry Last Time Buy status, long-term design continuity should account for the limited production window. The 74FST3257MNTWG currently maintains higher inventory levels (16,227 pcs) compared to the 74FST3257MN2TWG (3,710 pcs), making it the preferred selection for new procurement activities.

Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for industrial and commercial applications. The MSL 1 rating indicates unlimited shelf life under standard storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the 74FST3257MNTWG be used as a direct replacement for the 74FST3257MN2TWG?

A: Yes. Both parts are parametrically equivalent across all electrical, mechanical, and compliance specifications. They share identical circuit configuration (4 x 2:1), package type (16-VFQFN Exposed Pad), voltage supply range (4V ~ 5.5V), and operating temperature range (-40°C ~ 85°C).

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

A: The part numbers differ in their suffix designation (MN2TWG versus MNTWG), which reflects internal onsemi manufacturing or packaging lot tracking. No functional or electrical differences exist between the parts.

Q: Are there any package compatibility concerns?

A: No. Both parts use identical 16-QFN (2.5x3.5) surface mount packaging with exposed pad configuration. PCB footprints, reflow profiles, and assembly processes are identical.

Q: What does Last Time Buy status mean for these components?

A: Last Time Buy indicates that onsemi has discontinued production of these parts. Existing inventory represents the final available supply. Both the 74FST3257MN2TWG and 74FST3257MNTWG are subject to this status.

Q: Are these parts RoHS compliant?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for industrial applications.

Q: What is the Moisture Sensitivity Level (MSL) for these components?

A: Both parts carry MSL 1 rating, indicating unlimited shelf life under standard storage conditions. No special moisture control measures are required during storage or handling.