PI3B3126LE Bus Switch Equivalent & Substitute Parts

Part Overview

The PI3B3126LE is a 1 x 1:1 bus switch logic IC manufactured by Diodes Incorporated in a 14-TSSOP surface mount package. This component operates as a single-supply device with a voltage range of 3V to 3.6V and supports operating temperatures from -40°C to 85°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Bus switches are essential for signal routing and isolation in digital systems where multiple signal paths require controlled switching without signal degradation. Finding equivalent parts becomes necessary due to inventory constraints, supply chain considerations, or design optimization requirements while maintaining functional compatibility.

Substiute Parts

PI3B3126LE

Diodes IncorporatedIn Stock: 3042PI3B3126LE Datasheet

Current PartRFQ

PI3B3125LE

Diodes IncorporatedIn Stock: 5977PI3B3125LE Datasheet

Parametric EquivalentRFQ

SN74CBTLV3126DGVR

Texas InstrumentsIn Stock: 3161SN74CBTLV3126DGVR Datasheet

MFR RecommendedRFQ

SN74CBTLV3126PW

Texas InstrumentsIn Stock: 16106SN74CBTLV3126PW Datasheet

MFR RecommendedRFQ

SN74CBTLV3126PWR

Texas InstrumentsIn Stock: 53372SN74CBTLV3126PWR Datasheet

MFR RecommendedRFQ

TC7MBL3126CFT(EL)

Toshiba Semiconductor and StorageIn Stock: 4736TC7MBL3126CFT(EL) Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI3B3126LE is determined by the following critical parameters:

Primary Substitution Criteria:

• Circuit configuration (1 x 1:1 topology)
• Independent circuits count (4 circuits)
• Package type (14-TSSOP form factor with 0.173" width, 4.40mm)
• Mounting type (Surface Mount)
• Operating temperature range (-40°C ~ 85°C minimum)
• RoHS3 compliance status
• MSL rating (1 or equivalent)

Voltage Supply Compatibility: The PI3B3126LE operates at 3V ~ 3.6V. Substitute parts with extended voltage ranges (such as 2.3V ~ 3.6V) are functionally compatible as they encompass the original operating window. Parts with narrower or non-overlapping voltage ranges are not suitable substitutes.

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents (Same Manufacturer): PI3B3125LE from Diodes Incorporated maintains identical package, circuit topology, and voltage supply characteristics, differing only in base product designation.

Category 2 - Cross-Manufacturer Equivalents (Texas Instruments & Toshiba): SN74CBTLV3126 series (Texas Instruments) and TC7MBL3126CFT(EL) (Toshiba) provide equivalent 1 x 1:1 bus switch functionality in matching 14-TSSOP packages with compatible operating parameters. The SN74CBTLV series offers extended voltage range (2.3V ~ 3.6V) while maintaining all other critical specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - PI3B3125LE: This Diodes Incorporated part is the closest parametric equivalent with identical voltage supply range (3V ~ 3.6V), circuit topology, and package specifications. Both parts maintain active production status with ROHS3 compliance and MSL 1 rating. Selection of PI3B3125LE requires no design modifications and provides direct functional substitution.

Secondary Recommendation - SN74CBTLV3126PWR: The Texas Instruments SN74CBTLV3126PWR offers extended voltage supply range (2.3V ~ 3.6V) while maintaining all other critical parameters including 14-TSSOP packaging, 1 x 1:1 circuit configuration, and -40°C to 85°C operating temperature. This part is in active production status with ROHS3 compliance. The extended voltage range provides additional design flexibility without compromising compatibility with the original 3V ~ 3.6V operating window.

Alternative Recommendation - SN74CBTLV3126PW: This Texas Instruments variant provides identical electrical specifications to SN74CBTLV3126PWR with 14-TSSOP packaging. However, this part carries Last Time Buy status, indicating discontinued production. Selection should be limited to applications where long-term supply is not critical.

Extended Voltage Range Option - TC7MBL3126CFT(EL): The Toshiba TC7MBL3126CFT(EL) supports the widest voltage supply range (1.65V ~ 3.6V) and maintains 14-TSSOP packaging with -40°C to 85°C operating temperature. However, this part features a 4 x 1:1 circuit configuration with 1 independent circuit, which differs from the original 1 x 1:1 configuration with 4 independent circuits. This architectural difference requires careful evaluation for functional compatibility in the target application.

Packaging Consideration - SN74CBTLV3126DGVR: This Texas Instruments part uses 14-TFSOP packaging instead of 14-TSSOP. While both packages maintain 0.173" width and 4.40mm dimensions, the TFSOP variant may require PCB layout verification to confirm footprint compatibility with existing designs.

Frequently Asked Questions (FAQ)

Q: Can PI3B3125LE directly replace PI3B3126LE without design changes?

A: Yes. PI3B3125LE is a parametric equivalent from the same manufacturer with identical voltage supply range (3V ~ 3.6V), circuit topology (1 x 1:1), independent circuits count (4), package type (14-TSSOP), and operating temperature range (-40°C ~ 85°C). No design modifications are required.

Q: What is the difference between 14-TSSOP and 14-TFSOP packages?

A: Both packages maintain identical width (0.173", 4.40mm) and pin count (14). TSSOP denotes Thin Shrink Small Outline Package, while TFSOP denotes Thin Fine-Pitch Small Outline Package. The primary difference is pitch spacing. PCB footprint compatibility should be verified before substitution.

Q: Why does TC7MBL3126CFT(EL) have different circuit configuration (4 x 1:1 vs. 1 x 1:1)?

A: The Toshiba part organizes the same four independent circuits differently. The original PI3B3126LE uses 1 x 1:1 configuration (one 1:1 switch repeated four times), while TC7MBL3126CFT(EL) uses 4 x 1:1 configuration (four 1:1 switches in parallel). Functional compatibility depends on application-specific signal routing requirements.

Q: Can I use SN74CBTLV3126 series parts with extended voltage range (2.3V ~ 3.6V) in designs specified for 3V ~ 3.6V?

A: Yes. The extended voltage range encompasses the original operating window. SN74CBTLV3126 series parts are fully compatible with designs specified for 3V ~ 3.6V operation and provide additional flexibility for lower voltage applications.

Q: What does Last Time Buy status mean for SN74CBTLV3126PW?

A: Last Time Buy indicates that Texas Instruments has discontinued production of this part. Existing inventory may be available, but long-term supply cannot be guaranteed. For new designs or applications requiring sustained component availability, select parts with Active production status.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (PI3B3125LE, SN74CBTLV3126DGVR, SN74CBTLV3126PW, SN74CBTLV3126PWR, and TC7MBL3126CFT(EL)) maintain ROHS3 compliance status, matching the original PI3B3126LE specification.

Q: What is MSL 1 rating and why is it important?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life with no moisture precautions required. All listed parts maintain MSL 1 rating, ensuring consistent handling and storage requirements across substitutions.