RF1404C Equivalent & Substitute Parts

Part Overview

The RF1404C is a 433.92MHz Surface Acoustic Wave (SAW) filter manufactured by Murata Electronics, designed for remote control applications. This component operates at a center frequency of 433.92MHz with a 700kHz bandwidth and 2.4dB insertion loss in an 8-SMD, no-lead surface mount package.

The RF1404C is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this frequency band and package configuration.

Substiute Parts

RF1404C

Murata ElectronicsIn Stock: 3936RF1404C Datasheet

Current PartRFQ

B39431B3782Z810

Qualcomm (RF front-end (RFFE) filters)In Stock: 978B39431B3782Z810 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RF1404C is determined by the following critical parameters:

• Center Frequency: Must be 433.92MHz (no deviation permitted for remote control band compatibility)
• Package Type: Must be 8-SMD, no-lead configuration for PCB layout compatibility
• Mounting Type: Must be surface mount for assembly process alignment
• RoHS Compliance: Must meet ROHS3 requirements for regulatory alignment
• Moisture Sensitivity Level: Must be MSL 1 or equivalent for storage and handling compatibility

The substitute part B39431B3782Z810 meets all critical substitution criteria. While bandwidth and insertion loss parameters differ from the RF1404C, these variations remain within acceptable operational tolerances for remote control filter applications at this frequency.

Parameter Comparison

Engineering Selection Recommendations

The B39431B3782Z810 is a direct substitute for the RF1404C based on the following factors:

• Both components operate at the identical center frequency of 433.92MHz, ensuring band compatibility for remote control applications
• Both utilize the same 8-SMD, no-lead surface mount package, permitting direct PCB layout reuse
• Both meet ROHS3 compliance and MSL 1 moisture sensitivity requirements
• The B39431B3782Z810 carries AEC-Q200 automotive qualification, providing additional reliability assurance
• The B39431B3782Z810 is in active production status, ensuring ongoing supply availability compared to the obsolete RF1404C
• The substitute component features improved insertion loss (2.2dB vs. 2.4dB) and a smaller physical footprint (3.80mm x 3.80mm vs. 5.00mm x 5.00mm), offering potential design optimization benefits
• The wider bandwidth (1.1MHz vs. 700kHz) in the substitute remains suitable for remote control filtering applications

Frequently Asked Questions (FAQ)

Q: Can the B39431B3782Z810 be used as a direct replacement for the RF1404C on existing PCBs?

A: Yes. Both components share the same 8-SMD, no-lead package configuration and identical center frequency. The B39431B3782Z810 has a smaller footprint (3.80mm x 3.80mm vs. 5.00mm x 5.00mm) and lower profile (1.50mm vs. 1.70mm), which may require PCB layout verification to confirm adequate clearance and solder pad compatibility.

Q: What is the significance of the bandwidth difference between these parts?

A: The RF1404C has a 700kHz bandwidth, while the B39431B3782Z810 has a 1.1MHz bandwidth. The wider bandwidth in the substitute provides broader frequency response, which remains acceptable for remote control applications at 433.92MHz and does not compromise filtering performance.

Q: Does the lower insertion loss of the B39431B3782Z810 affect circuit performance?

A: The B39431B3782Z810 exhibits 2.2dB insertion loss compared to the RF1404C's 2.4dB. Lower insertion loss represents improved signal transmission efficiency and is a beneficial characteristic that does not require circuit redesign.

Q: Are there any compliance or certification differences between these parts?

A: Both components are ROHS3 compliant and carry MSL 1 moisture sensitivity ratings. The B39431B3782Z810 additionally carries AEC-Q200 automotive qualification, indicating enhanced reliability testing and suitability for demanding applications.

Q: Why is the RF1404C listed as obsolete?

A: The RF1404C is no longer in active production. The B39431B3782Z810 is the recommended active substitute that maintains functional and physical compatibility while offering improved specifications and ongoing supply availability.