B39871B3574U310 Equivalent & Substitute Parts

Part Overview

The B39871B3574U310 is a 868.3MHz Surface Acoustic Wave (SAW) filter manufactured by Qualcomm for RF front-end (RFFE) applications. This component is designed for remote control systems requiring precise frequency filtering at 868.3MHz with 4.2dB insertion loss. The part is currently classified as obsolete, necessitating identification of active equivalent components to maintain supply chain continuity for new designs and production requirements.

Substiute Parts

B39871B3574U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 1468B39871B3574U310 Datasheet

Current PartRFQ

B39871B3734H110

Qualcomm (RF front-end (RFFE) filters)In Stock: 874B39871B3734H110 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the B39871B3574U310 is determined by the following critical parameters that must remain constant or compatible:

Primary Substitution Criteria:

• Center frequency: 868.3MHz (exact match required)
• Application: Remote Control (functional equivalence)
• Mounting type: Surface Mount (PCB assembly compatibility)
• Manufacturer: Qualcomm RFFE filters (component family consistency)
• Compliance standards: ROHS3, REACH Unaffected, EAR99 classification

Secondary Compatibility Parameters:

• Insertion loss tolerance (4.2dB baseline; lower values acceptable for improved performance)
• Bandwidth specification (300kHz specified for substitute)
• Package form factor (SMD variants with no lead configuration)
• Height and dimensional constraints (PCB layout accommodation)

The B39871B3734H110 qualifies as a direct substitute based on identical center frequency (868.3MHz), matching application (Remote Control), equivalent mounting technology (Surface Mount), and identical compliance certifications. The substitute demonstrates improved electrical performance with lower insertion loss (3.2dB vs. 4.2dB) and defined bandwidth (300kHz).

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The B39871B3574U310 is classified as obsolete. The B39871B3734H110 is an active product with current manufacturing support and documented inventory availability (778 Pcs New Original In Stock). Selection of the active substitute ensures long-term supply chain reliability and access to technical support.

Compliance and Certification Alignment: Both components maintain identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and EAR99 export classification. This ensures regulatory equivalence for applications subject to environmental and trade compliance requirements.

Electrical Performance: The substitute component demonstrates superior electrical performance with insertion loss of 3.2dB compared to 4.2dB in the original part. This 1.0dB improvement reduces signal attenuation in remote control RF circuits. The specified 300kHz bandwidth in the substitute provides defined frequency selectivity for 868.3MHz remote control applications.

Physical Integration: The substitute 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 verification is required to confirm accommodation of the smaller 6-SMD package versus the original 8-SMD configuration. The reduced profile may provide advantages for compact remote control receiver designs.

Packaging Format: The substitute is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly operations. This packaging format is compatible with automated pick-and-place equipment used in modern electronics manufacturing.

Frequently Asked Questions (FAQ)

Q: Can the B39871B3734H110 be used as a direct replacement for the B39871B3574U310?

A: Yes. Both components operate at identical center frequency (868.3MHz) for remote control applications. Both are Qualcomm RFFE filters with Surface Mount technology, ROHS3 compliance, and EAR99 classification. The substitute is an active product with current manufacturing support, whereas the original is obsolete.

Q: What are the differences in package configuration?

A: The original part uses an 8-SMD, No Lead package measuring 5.00mm x 5.00mm x 1.35mm (max height). The substitute uses a 6-SMD, No Lead package measuring 3.00mm x 3.00mm x 1.00mm (max height). PCB layout must accommodate the smaller footprint and reduced pin count of the substitute package.

Q: Does the lower insertion loss of the substitute affect circuit design?

A: The substitute exhibits 3.2dB insertion loss compared to 4.2dB in the original part. This 1.0dB improvement reduces signal attenuation and may improve receiver sensitivity in remote control circuits. Existing circuit designs do not require modification; the substitute provides equivalent or superior performance.

Q: Are moisture sensitivity and handling requirements identical?

A: Yes. Both components are classified as Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity constraints. Identical handling and storage procedures apply to both parts.

Q: What is the significance of the 300kHz bandwidth specification in the substitute?

A: The substitute specifies 300kHz bandwidth at the 868.3MHz center frequency. This parameter defines the frequency selectivity of the filter for remote control applications. The original part does not specify bandwidth; the substitute provides this defined performance characteristic.

Q: Are compliance certifications equivalent between the two parts?

A: Yes. Both components are ROHS3 Compliant, REACH Unaffected, and classified as EAR99 for export purposes. Both share identical HTSUS code (8541.60.0080). Regulatory and environmental compliance requirements are fully satisfied by the substitute.