B39321B3751U310 Equivalent & Substitute Parts

Part Overview

The B39321B3751U310 is a 315MHz Surface Acoustic Wave (SAW) filter manufactured by Qualcomm for RF front-end applications. This component is designed for remote control systems requiring precise frequency filtering at the 315MHz band. The part operates with a 620kHz bandwidth and 2.1dB insertion loss in an 8-SMD, No Lead surface mount package.

The B39321B3751U310 carries an Obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and field replacement applications.

Substiute Parts

B39321B3751U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 886B39321B3751U310 Datasheet

Current PartRFQ

B39321B3761Z810

Qualcomm (RF front-end (RFFE) filters)In Stock: 1845B39321B3761Z810 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the B39321B3751U310 is determined by the following critical parameters:

Primary Substitution Criteria:

• Center frequency: 315MHz (exact match required)
• Package type: 8-SMD, No Lead (mechanical and electrical compatibility)
• Mounting type: Surface Mount (PCB assembly compatibility)
• Application: Remote Control (functional alignment)

Secondary Compatibility Parameters:

• Insertion loss tolerance (lower values acceptable for improved performance)
• Bandwidth specification (narrower bandwidth acceptable for improved selectivity)
• Physical dimensions (must fit within PCB layout constraints)
• Compliance certifications (RoHS3, REACH status)

The B39321B3761Z810 qualifies as a substitute part based on matching center frequency, package configuration, mounting type, and application requirements. This substitute demonstrates improved electrical performance characteristics while maintaining mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

B39321B3761Z810 as Primary Substitute:

The B39321B3761Z810 is the qualified substitute for the obsolete B39321B3751U310. Selection of this substitute is based on the following engineering factors:

Product Status Alignment: The substitute part carries Active product status, ensuring long-term availability and supply chain continuity compared to the Obsolete main part.

Compliance Certifications: Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for electronic component deployment.

Electrical Performance: The substitute demonstrates improved insertion loss (1.9dB versus 2.1dB) and narrower bandwidth (360kHz versus 620kHz). These characteristics represent enhanced selectivity and reduced signal attenuation, providing performance advantages in remote control filtering applications.

Mechanical Compatibility: Both parts utilize identical 8-SMD, No Lead package configuration and Surface Mount mounting type. The substitute features a smaller footprint (3.80mm x 3.80mm versus 5.00mm x 5.00mm), which may require PCB layout verification but offers space optimization benefits.

Frequency Specification: Both parts operate at the identical 315MHz center frequency, ensuring direct functional equivalence for remote control system applications.

Quality Assurance: The substitute part includes AEC-Q200 automotive-grade rating, indicating enhanced reliability qualification compared to the main part.

Frequently Asked Questions (FAQ)

Q: Can the B39321B3761Z810 directly replace the B39321B3751U310 in existing designs?

A: Direct replacement is possible from an electrical and functional standpoint. Both parts share identical center frequency (315MHz), package type (8-SMD, No Lead), and mounting configuration (Surface Mount). However, PCB layout verification is required due to the smaller footprint of the substitute (3.80mm x 3.80mm versus 5.00mm x 5.00mm). Verify that the reduced dimensions do not conflict with existing pad layouts or component spacing constraints.

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Product Status—the substitute is Active while the main part is Obsolete; (2) Insertion Loss—the substitute provides lower loss (1.9dB versus 2.1dB); (3) Bandwidth—the substitute offers narrower bandwidth (360kHz versus 620kHz); (4) Physical Size—the substitute is smaller (3.80mm x 3.80mm versus 5.00mm x 5.00mm); (5) Quality Rating—the substitute includes AEC-Q200 certification; (6) Packaging—the substitute is supplied in Tape & Reel format.

Q: Are there any compliance or regulatory concerns with substitution?

A: Both parts maintain identical RoHS3 compliance and REACH Unaffected status. No regulatory barriers exist for substitution. The substitute part's AEC-Q200 rating provides additional automotive-grade qualification, which may exceed original design requirements.

Q: How does the narrower bandwidth of the substitute affect system performance?

A: The substitute's 360kHz bandwidth is narrower than the main part's 620kHz bandwidth. This narrower bandwidth provides improved frequency selectivity and rejection of out-of-band signals. System performance impact depends on the specific remote control protocol and frequency tolerance requirements. Verify that the narrower bandwidth remains compatible with the intended application's frequency deviation specifications.

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

A: AEC-Q200 is an automotive-grade reliability qualification standard. The substitute part's inclusion of this rating indicates enhanced qualification testing and reliability assurance. This certification is not present on the main part specification but does not preclude substitution; it represents an additional quality assurance benefit.

Q: Are the moisture sensitivity levels equivalent?

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

Q: What packaging format differences exist?

A: The main part packaging format is not specified in the provided data. The substitute is supplied in Tape & Reel (TR) format, which is standard for high-volume surface mount assembly operations. Verify that your assembly process is compatible with Tape & Reel packaging.