PI5C3251Q Equivalent & Substitute Parts

Part Overview

The PI5C3251Q is a Multiplexer/Demultiplexer logic IC with 1 x 8:1 circuit configuration in a 16-QSOP package, manufactured by Diodes Incorporated. This component is classified as Obsolete, making substitute parts necessary for new designs and ongoing production requirements. The PI5C3251Q operates with single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C, serving applications requiring analog or digital signal multiplexing in space-constrained surface mount implementations.

Substiute Parts

PI5C3251Q

Diodes IncorporatedIn Stock: 1042PI5C3251Q Datasheet

Current PartRFQ

PI5C3251QE

Diodes IncorporatedIn Stock: 1470PI5C3251QE Datasheet

DirectRFQ

QS3251QG

Renesas Electronics CorporationIn Stock: 1238QS3251QG Datasheet

DirectRFQ

QS3251QG8

Renesas Electronics CorporationIn Stock: 1625QS3251QG8 Datasheet

DirectRFQ

SN74CBT3251D

Texas InstrumentsIn Stock: 1944SN74CBT3251D Datasheet

MFR RecommendedRFQ

SN74CBT3251DBQR

Texas InstrumentsIn Stock: 3742SN74CBT3251DBQR Datasheet

MFR RecommendedRFQ

SN74CBT3251DBR

Texas InstrumentsIn Stock: 5598SN74CBT3251DBR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI5C3251Q is determined by the following critical parameters:

• Circuit Type & Configuration: All substitutes must be Multiplexer/Demultiplexer devices with 1 x 8:1 circuit configuration and 1 independent circuit
• Voltage Supply: Single supply operation with voltage range compatibility (minimum 4V, maximum 5.5V overlap required)
• Temperature Range: Operating temperature must cover -40°C to 85°C minimum
• Mounting & Package: Surface mount technology with 16-pin SSOP or SOIC package footprints
• Compliance Status: RoHS3 compliance preferred for new designs; MSL rating must be documented

The substitute parts are grouped into two categories: direct Diodes Incorporated variants (PI5C3251QE) and cross-manufacturer alternatives (Renesas QS3251 series and Texas Instruments 74CBT3251 series). All listed substitutes meet the core electrical and mechanical requirements for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): QS3251QG8 (Renesas Electronics Corporation) is the preferred substitute due to Active product status, ensuring long-term availability and supply chain stability. This part maintains full electrical compatibility with the PI5C3251Q while offering ROHS3 compliance and MSL 1 rating.

Alternative Substitutes (Last Time Buy Status): PI5C3251QE, QS3251QG, SN74CBT3251D, SN74CBT3251DBQR, and SN74CBT3251DBR are all classified as Last Time Buy, indicating limited future availability. These parts are suitable for existing production lines but should not be selected for new long-term designs.

Package Consideration: SN74CBT3251D uses a 16-SOIC package (0.154", 3.90mm width) instead of 16-QSOP/16-SSOP, requiring PCB layout verification before substitution. SN74CBT3251DBR uses a wider 16-SSOP package (0.209", 5.30mm width) compared to the standard 0.154" width, necessitating footprint compatibility assessment.

Compliance Status: All substitute parts are ROHS3 compliant, addressing regulatory requirements absent in the original PI5C3251Q. Moisture sensitivity levels are documented for all alternatives, with SN74CBT3251DBQR requiring MSL 2 (1 Year) handling protocols.

Frequently Asked Questions (FAQ)

Q: Can PI5C3251QE directly replace PI5C3251Q without PCB modifications?

A: Yes. PI5C3251QE maintains identical electrical specifications (4V ~ 5.5V supply, -40°C ~ 85°C operating range) and package footprint (16-QSOP, 0.154" width). The primary difference is RoHS3 compliance status and Last Time Buy product classification.

Q: What is the voltage supply difference between Renesas QS3251 and Texas Instruments 74CBT3251 variants?

A: Renesas QS3251QG and QS3251QG8 operate within 4.75V ~ 5.25V, a narrower range than the original PI5C3251Q (4V ~ 5.5V) and Texas Instruments 74CBT3251 variants (4.5V ~ 5.5V). Verify your application's supply voltage tolerance before selecting Renesas parts.

Q: Are package footprints interchangeable between all listed substitutes?

A: No. SN74CBT3251D uses 16-SOIC packaging, and SN74CBT3251DBR uses a wider 16-SSOP variant (0.209" width). Only PI5C3251QE, QS3251QG, and QS3251QG8 share the standard 16-QSOP/16-SSOP footprint (0.154" width) with the original PI5C3251Q. Verify PCB footprint compatibility before substitution.

Q: Which substitute offers the longest supply availability?

A: QS3251QG8 (Renesas Electronics Corporation) is the only part with Active product status, providing the most reliable long-term availability. All other substitutes are classified as Last Time Buy, indicating limited future procurement windows.

Q: What is the MSL difference between SN74CBT3251DBQR and other substitutes?

A: SN74CBT3251DBQR requires MSL 2 (1 Year) moisture sensitivity handling, compared to MSL 1 (Unlimited) for all other substitutes. This requires stricter storage, handling, and reflow procedures per IPC-A-610 standards.