PI3B3245QE Equivalent & Substitute Parts

Part Overview

The PI3B3245QE is an 8x1:1 bus switch logic IC manufactured by Diodes Incorporated in a 20-QSOP surface mount package. This component operates on a single 3V to 3.6V supply and functions across the -40°C to 85°C temperature range. The part is currently in active production status with 2997 units in stock.

Bus switches are essential for multiplexing and signal routing applications where multiple data sources must be selectively connected to a single bus line. Finding equivalent parts becomes necessary when managing supply chain constraints, optimizing procurement costs, or accommodating specific packaging requirements in production environments.

Key Parameters

Parameter	Value
Manufacturer Part Number	PI3B3245QE
Manufacturer	Diodes Incorporated
Type	Bus Switch
Circuit Configuration	8 x 1:1
Independent Circuits	1
Voltage Supply Range	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution of the PI3B3245QE is determined by the following critical parameters:

Functional Equivalence Requirements:

Circuit configuration: 8 x 1:1 bus switch topology
Independent circuits: 1
Voltage supply source: Single supply operation

Electrical Compatibility Parameters:

Voltage supply range must encompass or overlap with 3V to 3.6V
Operating temperature range: -40°C to 85°C
Output current specifications (where applicable)

Physical and Environmental Compliance:

Surface mount technology
RoHS3 compliance
Moisture sensitivity level compatibility
REACH unaffected status

Package Considerations: Substitute parts are grouped by package type: 20-SSOP, 20-TSSOP, and 20-TVSOP. While these packages differ in physical dimensions, they maintain electrical equivalence when mounted on compatible PCB layouts. The PI3B3245QE uses 20-QSOP packaging, which is mechanically similar to 20-SSOP.

Parameter Comparison

Part Number	Manufacturer	Circuit Config	Voltage Supply	Temp Range	Package Type	Package Dimensions	Product Status	MSL	Inventory
PI3B3245QE	Diodes Inc.	8 x 1:1	3V ~ 3.6V	-40°C ~ 85°C	20-QSOP	0.154" x 3.90mm	Active	1	2997
74CBTLV3245PGG	Renesas Electronics	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173" x 4.40mm	Active	1	1979
SN74CB3Q3245DBQR	Texas Instruments	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-SSOP	0.154" x 3.90mm	Active	2	4224
SN74CB3Q3245PW	Texas Instruments	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173" x 4.40mm	Last Time Buy	1	2252
SN74CB3Q3245PWR	Texas Instruments	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173" x 4.40mm	Active	1	23200
SN74CBTLV3245ADBQR	Texas Instruments	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-SSOP	0.154" x 3.90mm	Active	2	23459
SN74CBTLV3245ADGVR	Texas Instruments	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TVSOP	0.173" x 4.40mm	Active	1	3200
SN74CBTLV3245APW	Texas Instruments	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173" x 4.40mm	Last Time Buy	1	2316
SN74CBTLV3245APWR	Texas Instruments	8 x 1:1	2.3V ~ 3.6V	-40°C ~ 85°C	20-TSSOP	0.173" x 4.40mm	Active	1	10050

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

SN74CBTLV3245ADBQR and SN74CB3Q3245DBQR are the most direct substitutes for the PI3B3245QE. Both maintain the 20-SSOP package format matching the original 20-QSOP dimensions (0.154" x 3.90mm), ensuring PCB layout compatibility without redesign. Both parts are in active production status with substantial inventory availability (23459 and 4224 units respectively). The extended voltage supply range (2.3V to 3.6V) provides additional operational flexibility beyond the PI3B3245QE specification.

Active Status Alternatives:

SN74CB3Q3245PWR offers the largest inventory position (23200 units) among all substitutes and maintains active product status. This part operates in 20-TSSOP packaging, which requires PCB layout modification due to different package dimensions (0.173" x 4.40mm). The extended voltage range and identical circuit configuration ensure functional equivalence.

SN74CBTLV3245APWR provides similar advantages with 10050 units in stock and active status, also in 20-TSSOP packaging.

Considerations for Discontinued or Limited Availability:

SN74CB3Q3245PW and SN74CBTLV3245APW carry Last Time Buy status, indicating these parts are approaching end-of-life. While currently available (2252 and 2316 units respectively), these should not be selected for new designs or long-term production commitments.

Packaging Trade-offs:

74CBTLV3245PGG (Renesas Electronics) provides an alternative source with active status but operates in 20-TSSOP packaging. SN74CBTLV3245ADGVR uses 20-TVSOP packaging with the smallest inventory (3200 units) and should be considered only when specific package requirements mandate this format.

Frequently Asked Questions (FAQ)

Q: Can I directly replace PI3B3245QE with any of these substitute parts without PCB modification?

A: Direct replacement without PCB modification is limited to parts using 20-SSOP packaging: SN74CBTLV3245ADBQR and SN74CB3Q3245DBQR. These maintain the same physical footprint as the original 20-QSOP package. Parts using 20-TSSOP or 20-TVSOP packaging require PCB layout changes due to different package dimensions.

Q: What is the significance of the extended voltage range (2.3V to 3.6V) in substitute parts compared to the PI3B3245QE (3V to 3.6V)?

A: The extended lower voltage limit in substitute parts provides additional operational margin. If your application operates at or near 3V, substitute parts with 2.3V minimum ratings offer greater design flexibility and reliability. However, if your design strictly requires 3V minimum operation, both specifications are functionally equivalent.

Q: Why do some substitute parts show MSL (Moisture Sensitivity Level) of 2 instead of 1?

A: MSL rating indicates moisture sensitivity during storage and handling. MSL 1 (unlimited shelf life) is less restrictive than MSL 2 (1-year shelf life). Parts with MSL 2 require more careful storage conditions and have shorter usable shelf life. For applications with standard manufacturing timelines, MSL 2 parts are acceptable, but MSL 1 parts offer greater flexibility in inventory management.

Q: Should I avoid parts marked as "Last Time Buy"?

A: Yes, for new designs or production runs extending beyond the current inventory. Last Time Buy status indicates the manufacturer is discontinuing the part. SN74CB3Q3245PW and SN74CBTLV3245APW should only be used if existing designs are locked to these specific part numbers and no redesign is feasible.

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

A: SN74CB3Q3245PWR (Texas Instruments, 23200 units in stock) and SN74CBTLV3245ADBQR (Texas Instruments, 23459 units in stock) both carry active product status with the highest inventory levels. SN74CBTLV3245ADBQR is preferred if PCB layout compatibility with the original 20-SSOP footprint is required.

Q: Are all these parts RoHS3 compliant?

A: Yes, all listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the PI3B3245QE.

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