PI3B3244QE Equivalent & Substitute Parts

Part Overview

The PI3B3244QE is a 4 x 1:1 bus switch logic IC manufactured by Diodes Incorporated in a 20-QSOP package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The PI3B3244QE operates as a single-supply bus switch with a voltage range of 3V to 3.6V and an operating temperature range of -40°C to 85°C. Substitution is required due to the obsolete product status and limited availability for future procurement.

Key Parameters

Parameter	Value
Part Number	PI3B3244QE
Manufacturer	Diodes Incorporated
Type	Bus Switch
Circuit Configuration	4 x 1:1
Independent Circuits	2
Voltage Supply	Single Supply
Voltage Range	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Package Type	20-QSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Compliance	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the PI3B3244QE are qualified based on the following critical parameters:

Functional Equivalence: All substitute parts maintain the 4 x 1:1 bus switch configuration with 2 independent circuits, ensuring identical switching functionality.

Voltage Supply Compatibility: The PI3B3244QE operates at 3V to 3.6V. All qualified substitutes operate at 2.3V to 3.6V, providing backward compatibility with the original voltage range while extending the lower operating limit.

Operating Temperature Range: All substitutes maintain the -40°C to 85°C operating temperature specification, ensuring thermal compatibility across applications.

Package Compatibility: Substitutes are grouped by package type. The PI3B3244QE uses a 20-QSOP package. Substitutes include 20-TSSOP, 20-SSOP, and 20-TVSOP packages, which differ in physical dimensions but maintain the same pin count and electrical interface.

Compliance Standards: All substitutes are ROHS3 compliant and REACH unaffected, matching the original part's environmental compliance.

Product Status: Active substitutes are preferred over obsolete or last-time-buy status parts for long-term design viability.

Parameter Comparison

Part Number	Manufacturer	Circuit Config	Voltage Range	Operating Temp	Package Type	Package Dimensions	Product Status	MSL Rating
PI3B3244QE	Diodes Incorporated	4 x 1:1	3V ~ 3.6V	-40°C ~ 85°C	20-QSOP	0.154", 3.90mm	Obsolete	1 (Unlimited)
74CBTLV3244PGG	IDT	4 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173", 4.40mm	Active	1 (Unlimited)
74CBTLV3244PGG8	Renesas Electronics	4 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173", 4.40mm	Active	1 (Unlimited)
SN74CB3Q3244DBQR	Texas Instruments	4 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-SSOP	0.154", 3.90mm	Active	2 (1 Year)
SN74CB3Q3244DGVR	Texas Instruments	4 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TVSOP	0.173", 4.40mm	Active	1 (Unlimited)
SN74CB3Q3244PW	Texas Instruments	4 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173", 4.40mm	Last Time Buy	1 (Unlimited)
SN74CB3Q3244PWR	Texas Instruments	4 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173", 4.40mm	Active	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: SN74CB3Q3244PWR (Texas Instruments) is the preferred substitute. This part is in active production status, ensuring long-term availability and supply chain stability. It maintains full functional equivalence with the PI3B3244QE, operates within the required voltage and temperature ranges, and carries ROHS3 compliance with MSL rating 1 (Unlimited), matching the original part's environmental specifications.

Alternative Selections by Package Requirement:

For designs requiring the original 20-SSOP package footprint (0.154", 3.90mm width), SN74CB3Q3244DBQR from Texas Instruments provides a direct mechanical substitute. This part is active and ROHS3 compliant, though it carries an MSL rating of 2 (1 Year), requiring controlled moisture handling during storage and assembly.

For applications where package width is not constrained, 74CBTLV3244PGG (IDT) and 74CBTLV3244PGG8 (Renesas Electronics) offer active production status with 20-TSSOP packaging. Both parts maintain full electrical compatibility and carry MSL rating 1 (Unlimited).

Avoid: SN74CB3Q3244PW carries a Last Time Buy status, indicating limited future availability and is not recommended for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitutes as a direct replacement for the PI3B3244QE?

A: Electrical substitution is possible for all listed parts due to identical circuit configuration (4 x 1:1), voltage supply type (single supply), and operating temperature range. However, mechanical substitution depends on package compatibility. The SN74CB3Q3244DBQR maintains the original 20-SSOP package dimensions. Other substitutes use different package types (20-TSSOP or 20-TVSOP) and require PCB layout verification.

Q: What is the difference between the 20-QSOP, 20-TSSOP, and 20-SSOP packages?

A: All three packages contain 20 pins and are surface-mount types. The 20-QSOP (original) measures 0.154" width (3.90mm). The 20-TSSOP measures 0.173" width (4.40mm). The 20-SSOP measures 0.154" width (3.90mm). Package selection affects PCB footprint and layout requirements. Verify your PCB design can accommodate the selected package before implementation.

Q: Why does the PI3B3244QE specify 3V to 3.6V while substitutes specify 2.3V to 3.6V?

A: The substitute parts have a lower minimum voltage specification (2.3V versus 3V), providing extended operating range. This does not affect compatibility with the original 3V to 3.6V requirement. The substitute parts will operate correctly within the original voltage range.

Q: What does MSL rating mean, and why does SN74CB3Q3244DBQR differ from other substitutes?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be stored in standard conditions before moisture absorption affects solderability. MSL 1 (Unlimited) allows indefinite storage. MSL 2 (1 Year) requires use within one year of packaging. SN74CB3Q3244DBQR's MSL 2 rating requires controlled storage and handling but does not affect electrical performance.

Q: Which substitute offers the best long-term availability?

A: SN74CB3Q3244PWR (Texas Instruments) is recommended for long-term designs. It is in active production status with the highest inventory level (23,200 pcs), ensuring sustained supply chain availability. All other active parts also provide reliable long-term sourcing.

Q: Are all substitutes ROHS3 compliant?

A: Yes, all listed substitutes are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the original PI3B3244QE.

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