RO3112E SAW Resonator 433.42 MHz Equivalent & Substitute Parts

Part Overview

The RO3112E is a Surface Acoustic Wave (SAW) resonator manufactured by Murata Electronics, operating at 433.42 MHz with 0.032 ppm frequency stability. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part is designed for surface mount applications requiring precise frequency reference in the 433 MHz ISM band, commonly used in wireless communication modules and RF systems.

Substiute Parts

RO3112E

Murata ElectronicsIn Stock: 933RO3112E Datasheet

Current PartRFQ

B39431R0904U410

Qualcomm (RF front-end (RFFE) filters)In Stock: 874B39431R0904U410 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RO3112E is determined by strict alignment of the following critical parameters:

• Center Frequency: 433.42 MHz (exact match required for RF system tuning)
• Package Type: 6-SMD, No Lead (mechanical and electrical interface compatibility)
• Package Dimensions: 3.00 mm × 3.00 mm (PCB layout compatibility)
• Mounting Type: Surface Mount (assembly process compatibility)
• Operating Temperature Range: -40°C to +85°C (environmental specification match)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)
• Moisture Sensitivity Level: MSL 1 (handling and storage compatibility)

The B39431R0904U410 qualifies as a functional equivalent based on matching all critical parameters. While the substitute is classified as a SAW filter rather than a resonator, both components operate at the identical center frequency with compatible mechanical and electrical interfaces suitable for 433.42 MHz RF applications.

Parameter Comparison

Engineering Selection Recommendations

The B39431R0904U410 is suitable as a substitute for the obsolete RO3112E based on the following engineering criteria:

Regulatory Compliance: Both components maintain ROHS3 compliance and EAR99 export classification, ensuring regulatory continuity in system design and supply chain operations.

Physical Compatibility: Identical package footprint (3.00 mm × 3.00 mm, 6-SMD No Lead) and surface mount configuration enable direct PCB layout reuse without redesign. The substitute's reduced height (1.10 mm vs. 1.38 mm) provides additional clearance margin.

Frequency Alignment: Exact center frequency match at 433.42 MHz ensures RF tuning parameters remain unchanged in system implementations.

Product Status: The substitute's active production status provides long-term supply chain stability and availability, addressing the obsolescence constraint of the original component.

Handling Requirements: Matching MSL 1 rating ensures identical moisture sensitivity handling procedures and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can the B39431R0904U410 be used as a direct replacement for the RO3112E without circuit modifications?

A: The identical center frequency (433.42 MHz), package type (6-SMD No Lead), and package dimensions (3.00 mm × 3.00 mm) support direct substitution at the component level. However, the substitute's 1.4 dB insertion loss specification differs from the original part's impedance-based characteristics. Circuit performance validation is necessary to confirm system-level compatibility.

Q: What is the difference between a SAW resonator and a SAW filter?

A: Both are Surface Acoustic Wave devices operating at 433.42 MHz. The RO3112E resonator provides frequency reference with 0.032 ppm stability and 1 MOhms impedance. The B39431R0904U410 filter provides frequency selectivity with 1.4 dB insertion loss. Functional equivalence depends on the specific application requirements within the RF signal chain.

Q: Are the moisture sensitivity levels identical?

A: Yes. Both components are rated MSL 1 (Unlimited), requiring identical handling, storage, and reflow procedures. No changes to manufacturing or assembly processes are necessary.

Q: Does the height difference affect PCB assembly?

A: The substitute is 0.28 mm shorter (1.10 mm vs. 1.38 mm). This provides additional clearance and does not create assembly constraints. The identical footprint ensures no PCB layout modifications are required.

Q: What certifications apply to both components?

A: Both components are ROHS3 compliant and classified as EAR99 for export purposes. Regulatory documentation requirements remain unchanged during substitution.