RO3103E SAW Resonator 418 MHz Equivalent & Substitute Parts

Part Overview

The RO3103E is a 418 MHz Surface Acoustic Wave (SAW) resonator manufactured by Murata Electronics, designed for applications requiring precise frequency control in the 418 MHz ISM band. This component features a 1 MOhms impedance and operates across the -40°C to 85°C temperature range with ±0.032ppm frequency stability. The RO3103E is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

RO3103E

Murata ElectronicsIn Stock: 1119RO3103E Datasheet

Current PartRFQ

ASR418S2-T

Abracon LLCIn Stock: 939ASR418S2-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RO3103E is determined by the following critical parameters:

Primary Matching Criteria:

• Frequency: 418 MHz (exact match required)
• Operating Temperature Range: -40°C to 85°C (minimum requirement)
• Mounting Type: Surface Mount (form factor requirement)
• Component Type: SAW Resonator (functional equivalence)

Secondary Compatibility Factors:

• Impedance characteristics (affects circuit matching requirements)
• Package footprint and dimensions (PCB layout compatibility)
• Frequency tolerance specifications (system performance impact)

The ASR418S2-T from Abracon LLC meets the primary matching criteria with identical frequency and operating temperature specifications. However, impedance differs significantly (23 Ohms versus 1 MOhms), and package dimensions vary, requiring circuit design evaluation for compatibility.

Parameter Comparison

Engineering Selection Recommendations

ASR418S2-T Substitution Considerations:

The ASR418S2-T is an active product from Abracon LLC with current manufacturing support and ROHS3 compliance, addressing the obsolescence status of the RO3103E. Both components share identical 418 MHz frequency and -40°C to 85°C operating temperature specifications, establishing functional frequency equivalence.

Critical differences require circuit-level evaluation:

• Impedance Mismatch: The 1 MOhms impedance of the RO3103E differs substantially from the 23 Ohms impedance of the ASR418S2-T. Existing matching networks and load circuits designed for the RO3103E require redesign for the ASR418S2-T.

• Package Footprint: The RO3103E uses a 6-SMD package (3.00mm × 3.00mm), while the ASR418S2-T uses a 4-SMD package (5.00mm × 3.50mm). PCB layout modifications are necessary.

• Frequency Tolerance: The RO3103E specifies ±10ppm tolerance; the ASR418S2-T specifies ±75kHz tolerance. Frequency tolerance equivalence must be verified for the specific application.

Selection of the ASR418S2-T is appropriate for new designs or redesigns where circuit modifications are feasible. For applications requiring minimal redesign, alternative sources should be evaluated.

Frequently Asked Questions (FAQ)

Q: Can the ASR418S2-T be used as a direct drop-in replacement for the RO3103E?

A: No. While both components operate at 418 MHz across the same temperature range, the impedance difference (1 MOhms versus 23 Ohms) and package footprint variation require circuit redesign and PCB layout modifications.

Q: What is the primary reason for seeking a substitute for the RO3103E?

A: The RO3103E is classified as obsolete. The ASR418S2-T is an active product with current manufacturing availability and ROHS3 compliance.

Q: Are there compatibility concerns with the different package types?

A: Yes. The RO3103E uses a 6-SMD package measuring 3.00mm × 3.00mm, while the ASR418S2-T uses a 4-SMD package measuring 5.00mm × 3.50mm. PCB footprint redesign is required.

Q: How do the frequency tolerance specifications compare?

A: The RO3103E specifies ±10ppm tolerance, while the ASR418S2-T specifies ±75kHz tolerance. Application-specific frequency accuracy requirements must be evaluated to determine compatibility.

Q: What is the impedance significance in substitution?

A: Impedance determines the electrical matching requirements in the circuit. The RO3103E's 1 MOhms impedance differs significantly from the ASR418S2-T's 23 Ohms impedance. Existing matching networks and load circuits must be redesigned accordingly.

Q: Are both components compliant with environmental regulations?

A: Both components have REACH Unaffected status. The ASR418S2-T additionally carries ROHS3 compliance certification, while the RO3103E compliance status is not specified.