RO3103A SAW Resonator 418 MHz Equivalent & Substitute Parts

Part Overview

The RO3103A is a 418 MHz Surface Acoustic Wave (SAW) resonator manufactured by Murata Electronics, designed for surface mount applications in the 4-SMD, No Lead package. This component operates across the -40°C to 125°C temperature range with frequency stability of ±0.032ppm and frequency tolerance of ±75kHz. The RO3103A is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

RO3103A

Murata ElectronicsIn Stock: 1446RO3103A Datasheet

Current PartRFQ

ASR418S2-T

Abracon LLCIn Stock: 939ASR418S2-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RO3103A is determined by the following critical parameters that must remain consistent:

Frequency matching at 418 MHz is mandatory for system operation and cannot be compromised. The 4-SMD, No Lead surface mount package ensures mechanical and electrical compatibility with existing PCB layouts. Frequency tolerance of ±75kHz establishes the acceptable deviation band for both the original and substitute components. The Tape & Reel packaging format maintains supply chain compatibility.

The ASR418S2-T from Abracon LLC satisfies these core substitution criteria. Both components operate at 418 MHz with identical frequency tolerance specifications and share the same 4-SMD, No Lead package configuration and physical dimensions. Both components feature MSL 1 (Unlimited) moisture sensitivity rating and are REACH Unaffected.

Differences in operating temperature range and frequency stability do not preclude substitution when the application requirements fall within the substitute part's specifications. The ASR418S2-T operates across -40°C to 85°C, which covers the lower portion of the RO3103A's temperature range. Selection should be based on actual application temperature requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASR418S2-T is the qualified substitute for the obsolete RO3103A based on matching frequency, frequency tolerance, package configuration, and physical dimensions. The substitute part carries Active product status, ensuring long-term availability and supply chain continuity.

The ASR418S2-T demonstrates ROHS3 compliance, providing environmental regulatory advantage over the original component. Both parts maintain identical REACH Unaffected status and MSL 1 moisture sensitivity rating.

The primary consideration for substitution is the operating temperature range differential. The RO3103A supports -40°C to 125°C operation, while the ASR418S2-T operates within -40°C to 85°C. Applications requiring sustained operation above 85°C cannot use the ASR418S2-T as a direct substitute. For applications operating within the -40°C to 85°C window, the ASR418S2-T provides full functional equivalence.

The ASR418S2-T exhibits a 0.20mm height reduction (1.40mm versus 1.60mm), which may require PCB layout verification in space-constrained applications but does not affect electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the ASR418S2-T replace the RO3103A in all applications?

A: The ASR418S2-T is electrically and mechanically compatible when application operating temperatures remain within -40°C to 85°C. Applications requiring operation above 85°C require alternative solutions.

Q: What is the significance of the frequency tolerance ±75kHz specification?

A: Frequency tolerance defines the maximum allowable deviation from the nominal 418 MHz center frequency at room temperature. Both the RO3103A and ASR418S2-T maintain this identical tolerance band, ensuring system frequency accuracy requirements are met by either component.

Q: Are there physical installation differences between these components?

A: Both components use the 4-SMD, No Lead package with identical 5.00mm x 4.60mm footprints. The ASR418S2-T is 0.20mm shorter in height. PCB layout compatibility is maintained; however, applications with minimal vertical clearance should verify the reduced height does not create assembly or functional issues.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the component has unlimited shelf life under standard storage conditions and requires no special moisture control measures during handling, storage, or assembly. Both components carry this rating.

Q: Why is the RO3103A classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The ASR418S2-T, with Active status, represents the current production equivalent and ensures access to new inventory for ongoing requirements.