B39871B3571U310 Equivalent & Substitute Parts

Part Overview

The B39871B3571U310 is a 868.69MHz Surface Acoustic Wave (SAW) filter manufactured by Qualcomm for RF front-end (RFFE) applications. This component is designed for remote control systems requiring precision frequency filtering at 868.69MHz with 3.1dB insertion loss. The part is currently classified as obsolete, necessitating identification of functionally compatible alternatives for ongoing design support and production requirements.

Substiute Parts

B39871B3571U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 1110B39871B3571U310 Datasheet

Current PartRFQ

B39871B3746H110

Qualcomm (RF front-end (RFFE) filters)In Stock: 1106B39871B3746H110 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B39871B3571U310 is determined by the following critical parameters:

Frequency Compatibility: The center frequency of 868.69MHz defines the primary application band. Substitute parts must operate within the 868MHz ISM band used for remote control systems.

Insertion Loss Performance: The 3.1dB insertion loss specification establishes the signal attenuation baseline. Substitute parts with lower insertion loss provide improved signal integrity.

Package and Mounting Compatibility: Surface mount packaging with SMD configuration enables direct PCB integration. Physical dimensions and height constraints determine board-level placement feasibility.

Electrical Specifications: Bandwidth and frequency tolerance parameters ensure filtering characteristics remain within system requirements.

Compliance and Status: Active product status with current certifications (RoHS3, REACH) ensures long-term supply availability and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

B39871B3746H110 as Primary Substitute

The B39871B3746H110 is the designated substitute for the obsolete B39871B3571U310 based on the following engineering criteria:

Frequency Alignment: Both parts operate in the 868MHz ISM band for remote control applications. The center frequency difference of 0.09MHz (868.69MHz versus 868.6MHz) is within typical system tolerance for this application class.

Performance Improvement: The substitute part provides superior insertion loss performance at 2.6dB compared to 3.1dB, resulting in 0.5dB signal gain improvement.

Active Product Status: The B39871B3746H110 maintains active product status with current manufacturing support, ensuring supply chain continuity and long-term availability.

Compliance Certification: Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The substitute part includes AEC-Q200 automotive qualification, providing additional reliability assurance.

Package Considerations: The substitute employs a smaller 6-SMD package (3.00mm x 3.00mm) with reduced height (1.00mm) compared to the 8-SMD package (5.00mm x 5.00mm, 1.35mm height). This requires PCB layout modification but provides space optimization benefits.

Frequently Asked Questions (FAQ)

Q: Can the B39871B3746H110 directly replace the B39871B3571U310 without PCB modification?

A: No. The substitute part uses a different package configuration (6-SMD versus 8-SMD) with smaller physical dimensions (3.00mm x 3.00mm versus 5.00mm x 5.00mm). PCB footprint redesign is required.

Q: What is the frequency tolerance between these two parts?

A: The center frequency difference is 0.09MHz (868.69MHz main part versus 868.6MHz substitute). Both parts operate within the 868MHz ISM band for remote control systems.

Q: Does the lower insertion loss of the substitute part affect system performance?

A: The B39871B3746H110 provides 0.5dB lower insertion loss (2.6dB versus 3.1dB), which improves signal transmission efficiency. System performance is enhanced or remains equivalent depending on receiver sensitivity margins.

Q: Are both parts RoHS compliant?

A: Yes. Both the B39871B3571U310 and B39871B3746H110 are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

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

A: AEC-Q200 is an automotive qualification standard. The B39871B3746H110 meets automotive reliability requirements, providing additional assurance for applications requiring enhanced quality standards.

Q: Is the substitute part available in the same packaging format?

A: No. The main part is supplied in bulk format, while the substitute is supplied in Tape & Reel (TR) format, which is standard for automated assembly processes.

Q: Can the B39871B3746H110 be used in new designs?

A: Yes. The active product status and current certifications make this part suitable for new design implementations requiring 868MHz SAW filtering for remote control applications.