B39431B3557U310 Equivalent & Substitute Parts

Part Overview

The B39431B3557U310 is a 434.42MHz Surface Acoustic Wave (SAW) filter manufactured by Qualcomm for RF front-end (RFFE) applications. This component operates as a remote control RF filter with 2dB insertion loss and is packaged in an 8-SMD, No Lead configuration. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional compatibility for remote control applications while meeting current supply chain requirements.

Substiute Parts

B39431B3557U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 981B39431B3557U310 Datasheet

Current PartRFQ

B39431B3733H110

Qualcomm (RF front-end (RFFE) filters)In Stock: 1213B39431B3733H110 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B39431B3557U310 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Center frequency: 434.42MHz (must match exactly for remote control RF filtering)
• Application: Remote Control (functional requirement)
• Mounting type: Surface Mount (PCB assembly compatibility)
• Manufacturer: Qualcomm RFFE filters (component family consistency)

Secondary Compatibility Criteria:

• Insertion loss tolerance: 2dB to 2.1dB (acceptable performance variation)
• RoHS3 compliance (regulatory requirement)
• MSL Level 1 (handling and storage compatibility)
• REACH Unaffected status (regulatory compliance)

The B39431B3733H110 qualifies as a substitute based on matching center frequency, application, mounting type, and regulatory compliance. Differences in package configuration (6-SMD vs. 8-SMD), physical dimensions, and insertion loss (2.1dB vs. 2dB) represent trade-offs between the obsolete and active alternatives.

Parameter Comparison

Engineering Selection Recommendations

For B39431B3733H110 Substitution:

The B39431B3733H110 is an active product with current manufacturing status, making it suitable for new designs and ongoing production requirements. Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements. The substitute part carries AEC-Q200 automotive qualification, providing additional reliability assurance for remote control applications.

Design Considerations:

PCB layout modifications are required due to package size reduction (5.00mm x 5.00mm to 3.00mm x 3.00mm) and height reduction (1.35mm to 1.00mm). The 6-SMD configuration differs from the 8-SMD original, necessitating footprint redesign. Insertion loss increases from 2dB to 2.1dB, representing a 0.1dB performance variation within acceptable remote control RF filtering parameters.

Supply Chain Status:

The B39431B3733H110 maintains active inventory (1173 Pcs) with Tape & Reel packaging suitable for automated assembly, compared to the obsolete B39431B3557U310 (901 Pcs remaining stock).

Frequently Asked Questions (FAQ)

Q: Can the B39431B3733H110 directly replace the B39431B3557U310 without PCB modifications?

A: No. The substitute part requires PCB layout changes due to different package configurations (6-SMD vs. 8-SMD), reduced footprint dimensions (3.00mm vs. 5.00mm), and lower profile (1.00mm vs. 1.35mm). Footprint redesign is mandatory.

Q: What is the impact of the 0.1dB insertion loss increase (2dB to 2.1dB)?

A: The insertion loss difference of 0.1dB falls within acceptable performance variation for remote control RF filtering applications. Both values meet the functional requirements for 434.42MHz SAW filter operation.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the B39431B3557U310 and B39431B3733H110 are ROHS3 compliant and REACH Unaffected. The substitute part additionally carries AEC-Q200 automotive qualification.

Q: What is the significance of the AEC-Q200 rating on the substitute part?

A: AEC-Q200 is an automotive electronics qualification standard. The B39431B3733H110 meets this specification, providing additional reliability assurance for applications requiring automotive-grade components.

Q: How do the packaging formats differ between these parts?

A: The B39431B3557U310 uses standard packaging, while the B39431B3733H110 is supplied in Tape & Reel (TR) format, optimized for automated pick-and-place assembly processes.

Q: Is the MSL Level 1 rating identical for both parts?

A: Yes. Both parts carry MSL Level 1 (Unlimited), indicating identical moisture sensitivity handling and storage requirements.