B39431R1903A310 Equivalent & Substitute Parts

Part Overview

The B39431R1903A310 is a Surface Acoustic Wave (SAW) RF filter manufactured by Qualcomm, designed for RF front-end (RFFE) applications operating at 433.9200MHz. This component is classified as obsolete, indicating it has been discontinued by the manufacturer and is no longer in active production. Finding equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this filter.

Substiute Parts

B39431R1903A310

Qualcomm (RF front-end (RFFE) filters)In Stock: 1182B39431R1903A310 Datasheet

Current PartRFQ

B39431R0980U410

Qualcomm (RF front-end (RFFE) filters)In Stock: 708B39431R0980U410 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the B39431R1903A310 is determined by the following critical parameters:

Primary Substitution Criteria:

• Identical package type: 6-SMD, No Lead configuration
• Compatible frequency range: Operating frequency within acceptable tolerance of 433.9200MHz
• Matching mounting technology: Surface Mount compatibility
• Physical footprint compatibility: 3.00mm x 3.00mm base dimensions
• Regulatory compliance: ROHS3 and REACH status alignment

Secondary Compatibility Factors:

• Moisture Sensitivity Level: MSL 1 or equivalent
• Height clearance: Maximum height not exceeding PCB design constraints
• Electrical performance: Insertion loss and bandwidth specifications suitable for application requirements

The substitute part B39431R0980U410 meets these criteria through identical package geometry, compatible frequency specification (433.42MHz), matching surface mount technology, and equivalent regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

Substitute Part: B39431R0980U410

The B39431R0980U410 is qualified as a direct substitute for the obsolete B39431R1903A310 based on the following engineering factors:

Mechanical Compatibility: Both parts share identical package geometry (6-SMD, No Lead, 3.00mm x 3.00mm footprint) and surface mount technology, ensuring PCB layout compatibility without redesign. The height differential of 0.004" (0.10mm) between the main part and substitute remains within typical PCB assembly tolerances and does not impact component placement or clearance requirements.

Regulatory and Compliance Alignment: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for current manufacturing standards. MSL 1 rating on both parts indicates unlimited shelf life under standard storage conditions.

Product Status and Supply Chain: The substitute part maintains active production status with 641 units in current inventory, providing reliable supply chain continuity compared to the obsolete main part. The transition from bulk packaging to Tape & Reel format reflects current manufacturing standards and improves handling efficiency in automated assembly environments.

Frequency and Electrical Performance: Operating frequency difference of 0.50MHz (433.42MHz vs. 433.9200MHz) represents a 0.115% deviation, which falls within typical RF filter tolerance specifications for 433MHz ISM band applications. The specified insertion loss of 1.4dB for the substitute part provides quantified electrical performance data for system design calculations.

Frequently Asked Questions (FAQ)

Q: Can B39431R0980U410 be used as a direct replacement for B39431R1903A310 without PCB modifications?

A: Yes. Both parts utilize identical 6-SMD, No Lead package geometry with 3.00mm x 3.00mm footprints. PCB layout and land pattern remain unchanged. The 0.004" height difference does not require design modifications for standard surface mount assembly processes.

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

A: The main part operates at 433.9200MHz while the substitute operates at 433.42MHz, representing a 0.50MHz difference or 0.115% deviation. This frequency offset is within typical RF filter specifications for 433MHz ISM band applications and should be evaluated against specific system requirements.

Q: Are there any compliance or regulatory differences between the two parts?

A: No. Both parts maintain identical ROHS3 compliance, REACH unaffected status, and MSL 1 moisture sensitivity rating. Regulatory and environmental requirements are equivalent.

Q: What is the significance of the packaging format change from bulk to Tape & Reel?

A: Tape & Reel packaging is the current manufacturing standard for automated assembly processes. This format improves handling efficiency, reduces component damage during placement, and aligns with modern production workflows. Bulk packaging is typically associated with legacy or obsolete products.

Q: Is the 1.4dB insertion loss specification of the substitute part acceptable for my application?

A: Insertion loss of 1.4dB is a standard specification for SAW filters in this frequency range. Acceptability depends on your system's RF budget and signal path requirements. Consult your system design specifications to confirm compatibility.

Q: Why is the main part listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The substitute part B39431R0980U410 is actively produced and represents the current equivalent offering from Qualcomm for this application category.

Q: Are there any height clearance concerns with the substitute part?

A: The substitute part maximum height is 0.043" (1.10mm) compared to 0.039" (1.00mm) for the main part. This 0.004" difference is negligible for standard PCB assembly and does not create clearance issues in typical RF module designs.