PI3B3244QEX Equivalent & Substitute Parts

Part Overview

The PI3B3244QEX is a bus switch IC manufactured by Diodes Incorporated, configured as a 4 x 1:1 logic switch in a 20-QSOP surface mount package. This component is designed for signal routing and multiplexing applications requiring low-capacitance switching. The part maintains Active product status with full RoHS3 compliance and REACH unaffected designation. Substitute parts are identified when equivalent functional specifications, electrical parameters, and mechanical compatibility requirements are met within the allowed tolerance ranges for this product category.

Substiute Parts

PI3B3244QEX

Diodes IncorporatedIn Stock: 3637PI3B3244QEX Datasheet

Current PartRFQ

SN74CB3Q3244DBQR

Texas InstrumentsIn Stock: 3070SN74CB3Q3244DBQR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI3B3244QEX is determined by the following critical parameters:

• Circuit Configuration: Must be 4 x 1:1 bus switch topology
• Independent Circuits: Must equal 2
• Package / Case: Must be 20-SSOP (0.154", 3.90mm Width) for mechanical and electrical compatibility
• Mounting Type: Must be Surface Mount
• Voltage Supply Source: Must be Single Supply
• Operating Temperature Range: Must support -40°C ~ 85°C minimum
• Product Status: Must be Active
• Compliance: Must maintain RoHS3 compliance and REACH unaffected status

The SN74CB3Q3244DBQR meets all substitution criteria. While the supply voltage range differs (2.3V ~ 3.6V versus 3V ~ 3.6V), the PI3B3244QEX operating range is fully contained within the substitute part's specification, ensuring functional compatibility. The substitute part's MSL rating of 2 (1 Year) represents a more stringent moisture handling requirement compared to the main part's MSL 1 (Unlimited).

Parameter Comparison

Engineering Selection Recommendations

Both the PI3B3244QEX and SN74CB3Q3244DBQR maintain Active product status with identical compliance certifications (ROHS3 Compliant, REACH Unaffected, EAR99 classification). The parts are functionally equivalent for applications operating within the 3V to 3.6V supply range. The SN74CB3Q3244DBQR offers extended lower voltage operation (2.3V minimum) and is suitable for designs requiring operation below 3V. Selection between these parts should consider supply voltage requirements, moisture handling protocols, and packaging preferences (QSOP versus SSOP designation). Both parts support the full -40°C to 85°C industrial temperature range and are available in equivalent 20-pin surface mount packages.

Frequently Asked Questions (FAQ)

Q: Can the SN74CB3Q3244DBQR replace the PI3B3244QEX in all applications?

A: Yes, for applications operating within the 3V to 3.6V supply voltage range. The SN74CB3Q3244DBQR is suitable as a direct substitute due to matching circuit configuration (4 x 1:1), independent circuit count (2), package dimensions (20-SSOP), and operating temperature range (-40°C to 85°C). Applications requiring supply voltages below 3V should use the SN74CB3Q3244DBQR exclusively.

Q: What is the difference between 20-QSOP and 20-SSOP packaging?

A: Both designations refer to 20-pin shrink small outline packages with identical physical dimensions (0.154" width, 3.90mm). The QSOP and SSOP designations may reflect supplier-specific nomenclature but represent mechanically and electrically compatible packages suitable for the same PCB footprints.

Q: Does the MSL rating difference affect substitution eligibility?

A: The MSL 2 (1 Year) rating of the SN74CB3Q3244DBQR is more restrictive than the MSL 1 (Unlimited) rating of the PI3B3244QEX. This affects moisture exposure handling and storage protocols but does not prevent functional substitution. Applications must implement appropriate moisture control procedures consistent with MSL 2 requirements when using the substitute part.

Q: Are there any voltage supply considerations when substituting?

A: The PI3B3244QEX operates at 3V minimum supply voltage, while the SN74CB3Q3244DBQR operates at 2.3V minimum. Both parts function identically within the overlapping 3V to 3.6V range. For designs operating below 3V, only the SN74CB3Q3244DBQR is suitable.

Q: Do both parts meet the same compliance and regulatory requirements?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Both share identical HTSUS classification (8542.39.0001) for tariff purposes.