B39431B3750U310 Equivalent & Substitute Parts

Part Overview

The B39431B3750U310 is a 433.92MHz 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 433.92MHz ISM band. The part operates with 2dB insertion loss and 120kHz bandwidth in an 8-SMD, No Lead surface mount package.

The B39431B3750U310 is classified as Obsolete. Locating equivalent or substitute components is necessary for new designs, production continuity, and long-term system support where original inventory is depleted or unavailable.

Substiute Parts

B39431B3750U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 1206B39431B3750U310 Datasheet

Current PartRFQ

B39431B3743H110

Qualcomm (RF front-end (RFFE) filters)In Stock: 17092B39431B3743H110 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B39431B3750U310 is determined by the following critical parameters:

Primary Substitution Criteria:

• Center frequency match: 433.92MHz (mandatory for RF tuning and system compliance)
• Application compatibility: Remote control systems
• Mounting technology: Surface mount configuration
• Manufacturer alignment: Qualcomm RF SAW filter technology
• Compliance standards: ROHS3 and REACH requirements

Secondary Compatibility Factors:

• Insertion loss tolerance within system specifications
• Bandwidth characteristics suitable for remote control modulation schemes
• Package footprint and height constraints for PCB integration
• Moisture sensitivity rating (MSL 1 acceptable for both parts)

The B39431B3743H110 qualifies as a substitute based on identical center frequency (433.92MHz), matching application (remote control), equivalent compliance certifications, and compatible surface mount technology. Differences in bandwidth (340kHz vs. 120kHz), insertion loss (1.9dB vs. 2dB), package configuration (6-SMD vs. 8-SMD), and physical dimensions require engineering evaluation for specific circuit implementations.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The B39431B3750U310 is classified as Obsolete, making the B39431B3743H110 the appropriate active alternative. The substitute part carries AEC-Q200 automotive qualification, indicating enhanced reliability testing and quality assurance protocols.

Compliance and Certification: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for current manufacturing standards. The substitute part's AEC-Q200 rating provides additional assurance for applications requiring automotive-grade component reliability.

Physical Integration: The B39431B3743H110 features a smaller footprint (3.00mm x 3.00mm vs. 5.00mm x 5.00mm) and reduced height (1.00mm vs. 1.35mm). PCB layout modifications may be required to accommodate the 6-SMD package versus the original 8-SMD configuration. Verify that the reduced physical dimensions are compatible with existing PCB designs and assembly equipment.

Electrical Performance: The substitute part exhibits lower insertion loss (1.9dB vs. 2dB) and wider bandwidth (340kHz vs. 120kHz). These characteristics may affect receiver sensitivity and selectivity in remote control circuits. Circuit simulation or prototype testing is necessary to confirm performance equivalence within the target application's signal processing chain.

Frequently Asked Questions (FAQ)

Q: Can the B39431B3743H110 directly replace the B39431B3750U310 without PCB modifications?

A: Direct replacement requires verification of PCB layout compatibility. The substitute part uses a 6-SMD package in a 3.00mm x 3.00mm footprint, compared to the original 8-SMD package at 5.00mm x 5.00mm. Pad layout, trace routing, and assembly equipment capabilities must be evaluated. Physical dimensions and pad configurations differ significantly.

Q: What is the impact of the 340kHz bandwidth in the B39431B3743H110 versus the 120kHz bandwidth of the original part?

A: Bandwidth determines the frequency range passed by the filter. The wider 340kHz bandwidth of the substitute part provides broader frequency acceptance, which may affect selectivity and rejection of adjacent channel interference. The narrower 120kHz bandwidth of the original part provides tighter frequency selectivity. Application-specific modulation schemes and channel spacing requirements determine whether the wider bandwidth is acceptable.

Q: Are both parts suitable for new design implementations?

A: The B39431B3750U310 is Obsolete and unsuitable for new designs. The B39431B3743H110 is Active and carries AEC-Q200 qualification, making it the appropriate choice for new remote control filter implementations. Active product status ensures ongoing availability, manufacturing support, and supply chain continuity.

Q: What does the AEC-Q200 rating on the B39431B3743H110 indicate?

A: AEC-Q200 is an automotive electronics quality standard requiring enhanced reliability testing, including temperature cycling, vibration, and moisture resistance validation. This certification indicates the substitute part meets automotive-grade quality requirements, providing additional assurance for applications demanding high reliability.

Q: How do the insertion loss values (2dB vs. 1.9dB) affect system performance?

A: Insertion loss represents signal attenuation through the filter. The 0.1dB difference is minimal and typically negligible in most remote control receiver designs. Both values fall within acceptable ranges for ISM band filtering. Receiver gain and noise figure specifications determine whether this small difference impacts overall system sensitivity.

Q: Is the smaller package size of the B39431B3743H110 an advantage or disadvantage?

A: The smaller 3.00mm x 3.00mm footprint enables more compact PCB layouts and reduced board space consumption. However, this requires verification that assembly equipment, solder reflow profiles, and handling procedures are compatible with the 6-SMD package configuration. Smaller packages may present challenges in manual rework or repair scenarios.

Q: Do both parts require identical moisture handling procedures?

A: Both parts carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no moisture-related storage or handling restrictions. Standard ESD precautions and normal storage conditions are sufficient for both components. No special desiccant packaging or baking procedures are required prior to assembly.