B39401R709U310 Equivalent & Substitute Parts

Part Overview

The B39401R709U310 is a 403.5MHz Surface Acoustic Wave (SAW) RF filter manufactured by Qualcomm for RF front-end (RFFE) applications. This component features a 1.4dB insertion loss and is packaged in an 8-SMD, No Lead configuration with a 5.00mm x 5.00mm footprint. The part is classified as obsolete, necessitating identification of active equivalent components to maintain design continuity and ensure supply chain availability for new production and field replacements.

Substiute Parts

B39401R709U310

Qualcomm (RF front-end (RFFE) filters)In Stock: 934B39401R709U310 Datasheet

Current PartRFQ

B39401R0983H110

Qualcomm (RF front-end (RFFE) filters)In Stock: 1212B39401R0983H110 Datasheet

SimilarRFQ

B39401R983U410

Qualcomm (RF front-end (RFFE) filters)In Stock: 1047B39401R983U410 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the B39401R709U310 is determined by the following critical parameters:

Primary Substitution Criteria:

• Manufacturer: Qualcomm (same manufacturer ensures design compatibility)
• Series: B39401 (same product family)
• Center Frequency: 403.5MHz (identical operating frequency required for RF performance)
• Mounting Type: Surface Mount (PCB assembly compatibility)
• RoHS/REACH Compliance: ROHS3 Compliant, REACH Unaffected (regulatory alignment)
• MSL Rating: 1 (Unlimited) (moisture sensitivity compatibility)

Secondary Compatibility Factors:

• Package configuration (8-SMD vs. 6-SMD) affects PCB layout and footprint
• Insertion Loss variance (1.4dB vs. 1.5dB) impacts signal attenuation characteristics
• Physical dimensions and height affect board space and thermal management
• Product Status (Active vs. Obsolete) determines long-term availability

The substitute parts identified maintain the same center frequency and core RF functionality while offering improved availability through active product status.

Parameter Comparison

Engineering Selection Recommendations

B39401R983U410 (Primary Substitute): This part is the preferred substitute for the B39401R709U310. Both components operate at 403.5MHz center frequency with comparable insertion loss (1.4dB vs. 1.5dB differential of 0.1dB). The B39401R983U410 is active product status, ensuring long-term availability and supply chain continuity. The component carries AEC-Q200 automotive qualification, providing additional reliability assurance. The transition from 8-SMD to 6-SMD packaging and reduction in footprint from 5.00mm to 3.00mm requires PCB layout modification but offers improved board density and reduced height profile (1.00mm vs. 1.35mm). Both parts maintain identical RoHS3 compliance and MSL-1 ratings.

B39401R0983H110 (Secondary Substitute): This part shares the same B39401 series designation and active product status. However, center frequency and insertion loss specifications are not provided in the available data, limiting direct RF performance comparison. The 6-SMD, No Lead package and 3.00mm x 3.00mm footprint provide space optimization benefits. This part is suitable only when frequency and insertion loss specifications can be independently verified to match 403.5MHz and acceptable loss parameters.

Compliance Alignment: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL-1 (Unlimited) moisture sensitivity ratings, ensuring regulatory and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can B39401R983U410 directly replace B39401R709U310 without PCB modification?

A: No. The B39401R983U410 uses a 6-SMD, No Lead package with 3.00mm x 3.00mm footprint, compared to the original 8-SMD, No Lead package with 5.00mm x 5.00mm footprint. PCB layout and footprint redesign is required. The reduced height (1.00mm vs. 1.35mm) may also affect component clearance considerations.

Q: What is the insertion loss difference between the main part and B39401R983U410?

A: The B39401R709U310 specifies 1.4dB insertion loss, while the B39401R983U410 specifies 1.5dB insertion loss. The 0.1dB differential represents a minor increase in signal attenuation and should be evaluated within the context of the overall RF circuit design and system margin requirements.

Q: Why is B39401R0983H110 listed as a secondary substitute?

A: The B39401R0983H110 lacks specified center frequency and insertion loss data in the available documentation. While it shares the B39401 series designation and active product status, RF performance parameters cannot be directly compared to the original part. Frequency and loss specifications must be independently verified before design implementation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both B39401R983U410 and B39401R0983H110 are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original B39401R709U310.

Q: What is the inventory status of substitute parts?

A: B39401R983U410 has 1023 pieces in stock (active product). B39401R0983H110 has 1109 pieces in stock (active product). The original B39401R709U310 has 859 pieces available but is classified as obsolete.

Q: Does B39401R983U410 carry any additional certifications?

A: Yes. The B39401R983U410 carries AEC-Q200 automotive qualification, providing enhanced reliability assurance for automotive and mission-critical applications. The original B39401R709U310 does not specify this rating.