B39321B3576U310 Equivalent & Substitute Parts

Part Overview

The B39321B3576U310 is a 315MHz Surface Acoustic Wave (SAW) filter manufactured by Qualcomm for RF front-end applications. This component functions as a remote control RF filter with 3.3dB insertion loss and 200kHz bandwidth in an 8-SMD, no-lead surface mount package. The part is classified as obsolete, making identification of equivalent substitute components necessary for ongoing system support and new design implementations where this frequency and application remain relevant.

Substiute Parts

B39321B3576U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 981B39321B3576U310 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 B39321B3576U310 is determined by the following critical parameters:

Primary Matching Criteria:

• Center frequency: 315MHz (exact match required)
• Mounting type: Surface Mount (exact match required)
• Package type: 8-SMD, No Lead (exact match required)
• Application: Remote Control (exact match required)

Secondary Compatibility Parameters:

• Bandwidth tolerance
• Insertion loss tolerance
• Physical dimensions (length, width, height)
• Compliance certifications (RoHS3, REACH)
• Moisture sensitivity level

The substitute part B39321B3761Z810 meets all primary matching criteria. Differences exist in insertion loss (1.9dB versus 3.3dB), bandwidth (360kHz versus 200kHz), physical dimensions, and product status (active versus obsolete). These differences must be evaluated within the context of the specific application circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

B39321B3761Z810 as Primary Substitute:

The B39321B3761Z810 is the designated substitute for the obsolete B39321B3576U310. Both components share identical center frequency (315MHz), mounting technology (surface mount), package configuration (8-SMD, no lead), and application domain (remote control). Both maintain ROHS3 compliance and MSL Level 1 rating.

The substitute part offers the following advantages:

• Active product status ensures ongoing availability and manufacturing support
• Lower insertion loss (1.9dB versus 3.3dB) reduces signal attenuation
• Wider bandwidth (360kHz versus 200kHz) provides increased frequency selectivity range
• Smaller footprint (3.80mm x 3.80mm versus 5.00mm x 5.00mm) enables more compact PCB layouts
• AEC-Q200 automotive qualification rating provides additional reliability assurance

Physical dimension differences (footprint and height) require PCB layout verification. The substitute part's smaller dimensions are compatible with existing 8-SMD, no-lead footprints but may require pad adjustment depending on original design specifications.

Frequently Asked Questions (FAQ)

Q: Can B39321B3761Z810 directly replace B39321B3576U310 without circuit modification?

A: Both parts share identical center frequency, mounting type, and package configuration. However, the substitute exhibits lower insertion loss (1.9dB versus 3.3dB) and wider bandwidth (360kHz versus 200kHz). Circuit performance will improve due to reduced signal loss. PCB layout verification is required due to smaller footprint dimensions (3.80mm x 3.80mm versus 5.00mm x 5.00mm).

Q: What is the significance of the insertion loss difference?

A: Insertion loss represents signal attenuation through the filter. The substitute part's 1.9dB loss is 1.4dB lower than the original part's 3.3dB loss. This reduction improves signal strength in the remote control RF path, resulting in better receiver sensitivity and extended operating range.

Q: Does the wider bandwidth of the substitute part affect selectivity?

A: The substitute part's 360kHz bandwidth is 160kHz wider than the original 200kHz specification. Wider bandwidth can pass additional frequency content. Application circuit requirements determine whether this bandwidth expansion is acceptable. Signal filtering characteristics must be evaluated within the complete system design.

Q: Are there packaging differences between these parts?

A: The original part packaging is not specified. The substitute part is supplied in Tape & Reel (TR) format, standard for high-volume surface mount assembly. Both parts use identical 8-SMD, no-lead package type.

Q: What compliance certifications apply to the substitute part?

A: B39321B3761Z810 carries AEC-Q200 automotive qualification, ROHS3 compliance, REACH unaffected status, and MSL Level 1 rating. These certifications match or exceed the original part's compliance profile.

Q: Are physical dimension differences critical for PCB compatibility?

A: The substitute part is smaller (3.80mm x 3.80mm versus 5.00mm x 5.00mm footprint; 1.50mm versus 1.35mm height). Existing PCB pads designed for the original part may require adjustment. Height difference is minimal (0.15mm) and unlikely to cause assembly clearance issues. Footprint reduction requires pad layout verification.