PI3B3257Q Equivalent & Substitute Parts

Part Overview

The PI3B3257Q is a Multiplexer/Demultiplexer logic IC with a 4 x 2:1 circuit configuration, manufactured by Diodes Incorporated in a 16-QSOP package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain compatibility across voltage supply ranges, operating temperature specifications, and physical packaging dimensions while meeting current RoHS and REACH compliance standards.

Substiute Parts

PI3B3257Q

Diodes IncorporatedIn Stock: 1165PI3B3257Q Datasheet

Current PartRFQ

PI3B3257QE

Diodes IncorporatedIn Stock: 22826PI3B3257QE Datasheet

DirectRFQ

74CBTLV3257DS,118

NXP USA Inc.In Stock: 211974CBTLV3257DS,118 Datasheet

DirectRFQ

74CBTLV3257QG

Renesas Electronics CorporationIn Stock: 237374CBTLV3257QG Datasheet

MFR RecommendedRFQ

74CBTLV3257QG8

Renesas Electronics CorporationIn Stock: 208974CBTLV3257QG8 Datasheet

MFR RecommendedRFQ

SN74CB3Q3257DBQR

Texas InstrumentsIn Stock: 4186SN74CB3Q3257DBQR Datasheet

MFR RecommendedRFQ

SN74CBTLV3257DBQR

Texas InstrumentsIn Stock: 25368SN74CBTLV3257DBQR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI3B3257Q is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package / Case: 16-SSOP (0.154", 3.90mm Width) — physical footprint compatibility
• Mounting Type: Surface Mount — assembly process compatibility
• Voltage Supply Source: Single Supply — power architecture compatibility
• Circuit Configuration: 4 x 2:1 or functionally equivalent topology
• Operating Temperature Range: Must encompass or exceed -40°C ~ 125°C

Secondary Compliance Criteria:

• RoHS3 Compliance status for new production designs
• REACH Unaffected classification
• Moisture Sensitivity Level (MSL) rating

Substitute parts are grouped into two functional categories: direct pin-compatible replacements maintaining the 4 x 2:1 circuit topology, and functionally equivalent alternatives with 4 x 1:2 topology that provide equivalent multiplexing capability with different circuit organization.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

PI3B3257QE is the primary substitute for PI3B3257Q. Both parts maintain identical circuit topology (4 x 2:1), voltage supply range (3V ~ 3.6V), and operating temperature range (-40°C ~ 125°C). PI3B3257QE holds Active product status and ROHS3 compliance, making it suitable for new production designs. The higher inventory availability (22799 Pcs) supports supply chain continuity.

SN74CB3Q3257DBQR provides an alternative direct replacement with 4 x 2:1 topology and identical independent circuit count. This Texas Instruments part maintains the same voltage supply range and package configuration. Operating temperature is limited to -40°C ~ 85°C, which may restrict use in applications requiring the full 125°C upper limit. MSL rating of 2 (1 Year) requires controlled storage conditions compared to the unlimited MSL of PI3B3257QE.

Functionally Equivalent Alternatives (Circuit Topology Variation):

74CBTLV3257QG, 74CBTLV3257QG8, 74CBTLV3257DS,118, and SN74CBTLV3257DBQR employ a 4 x 1:2 circuit topology with 4 independent circuits, providing equivalent multiplexing functionality through different circuit organization. These parts support expanded voltage supply range (2.3V ~ 3.6V) and maintain 16-SSOP package compatibility. Operating temperature is limited to -40°C ~ 85°C. These alternatives are suitable for applications where circuit topology flexibility is acceptable and temperature range requirements do not exceed 85°C.

Compliance Considerations:

All substitute parts except 74CBTLV3257DS,118 carry explicit ROHS3 compliance certification. For new production designs subject to RoHS regulations, PI3B3257QE is the recommended primary choice. The original PI3B3257Q is RoHS non-compliant and should not be specified for new designs.

Frequently Asked Questions (FAQ)

Q: Can PI3B3257QE be used as a direct replacement for PI3B3257Q?

A: Yes. PI3B3257QE maintains identical circuit topology (4 x 2:1), voltage supply range (3V ~ 3.6V), operating temperature range (-40°C ~ 125°C), and 16-SSOP package configuration. Both parts are functionally interchangeable at the circuit level. PI3B3257QE is Active status with ROHS3 compliance, making it the preferred substitute for new designs.

Q: What is the difference between 4 x 2:1 and 4 x 1:2 circuit topologies?

A: Both topologies provide equivalent multiplexing functionality but with different circuit organization. The 4 x 2:1 configuration uses a single independent circuit with four 2-to-1 multiplexers. The 4 x 1:2 configuration uses four independent circuits, each functioning as a 1-to-2 demultiplexer. Circuit selection depends on application requirements and PCB layout constraints.

Q: Are there temperature range limitations with substitute parts?

A: PI3B3257QE maintains the full -40°C ~ 125°C operating range of the original part. Alternative substitutes (74CBTLV series and SN74CB3Q3257DBQR) are limited to -40°C ~ 85°C. Applications requiring operation above 85°C must use PI3B3257QE or the original PI3B3257Q.

Q: What packaging options are available for substitute parts?

A: PI3B3257QE is supplied in Tube packaging. 74CBTLV3257QG is available in Tube. 74CBTLV3257QG8 is supplied in Tape & Reel (TR) format for automated assembly. SN74CB3Q3257DBQR and SN74CBTLV3257DBQR are available in Cut Tape (CT) & Digi-Reel® format. 74CBTLV3257DS,118 is supplied in Bulk. Packaging selection should align with assembly process requirements and volume specifications.

Q: Are all substitute parts RoHS compliant?

A: PI3B3257QE, 74CBTLV3257QG, 74CBTLV3257QG8, SN74CB3Q3257DBQR, and SN74CBTLV3257DBQR carry ROHS3 compliance certification. 74CBTLV3257DS,118 does not specify RoHS status. For applications subject to RoHS regulations, use only parts with explicit ROHS3 certification.

Q: What is the MSL rating significance for these parts?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture control. MSL 2 requires controlled storage conditions with a maximum shelf life of 1 year. PI3B3257QE and the 74CBTLV series carry MSL 1 rating. SN74CB3Q3257DBQR and SN74CBTLV3257DBQR carry MSL 2 rating, requiring proper moisture management during storage and handling.

Q: Which substitute part offers the best inventory availability?

A: SN74CBTLV3257DBQR has the highest inventory availability at 25300 Pcs. PI3B3257QE has 22799 Pcs available. Both parts support immediate procurement for production requirements. Availability should be verified with suppliers for current stock levels.