RO3104A SAW Resonator 303.825 MHz Equivalent & Substitute Parts

Part Overview

The RO3104A is a 303.825 MHz Surface Acoustic Wave (SAW) resonator manufactured by Murata Electronics, designed for surface mount applications in frequency control circuits. This component operates across the industrial temperature range of -40°C to 85°C with 1 MOhms impedance and 0.032ppm frequency stability. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

RO3104A

Murata ElectronicsIn Stock: 984RO3104A Datasheet

Current PartRFQ

ASR303.825E-T

Abracon LLCIn Stock: 1101ASR303.825E-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RO3104A is determined by the following critical parameters that must align across candidate parts:

Mandatory Matching Parameters:

• Frequency: 303.825 MHz (exact match required for circuit resonance)
• Operating Temperature Range: -40°C to 85°C (minimum required coverage)
• Mounting Type: Surface Mount (PCB assembly compatibility)
• Type: SAW Resonator (functional category)

Compatible Variation Parameters:

• Package / Case: 4-SMD or 8-SMD configurations are acceptable for surface mount assembly, provided PCB footprint design accommodates the dimensional differences
• Size / Dimension: Variations within surface mount envelope are permissible if layout allows
• Height: Minor variations acceptable within assembly clearance constraints
• Frequency Stability and Impedance: Specifications provided for the substitute must meet or exceed the original performance requirements

The ASR303.825E-T from Abracon LLC meets all mandatory matching parameters and represents a direct functional equivalent for the obsolete RO3104A.

Parameter Comparison

Engineering Selection Recommendations

The ASR303.825E-T is the recommended substitute for the obsolete RO3104A based on the following engineering criteria:

Functional Equivalence: Both components operate at the identical frequency of 303.825 MHz across the same temperature range (-40°C to 85°C), ensuring circuit performance compatibility.

Product Status: The ASR303.825E-T maintains active production status with Abracon LLC, providing long-term availability and supply chain stability compared to the obsolete RO3104A.

Regulatory Compliance: The ASR303.825E-T is ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Physical Compatibility: While the ASR303.825E-T uses an 8-SMD package versus the 4-SMD package of the RO3104A, both are surface mount configurations with comparable footprint dimensions (5.00mm x 5.00mm versus 5.00mm x 4.60mm). PCB layout modification may be required to accommodate the slightly larger package width.

Moisture Sensitivity: Both components share MSL 1 (Unlimited) classification, indicating identical moisture handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the ASR303.825E-T be used as a direct drop-in replacement for the RO3104A?

A: The ASR303.825E-T is functionally equivalent at the circuit level due to matching frequency and operating temperature specifications. However, the package footprint differs (8-SMD versus 4-SMD), requiring PCB layout verification. The ASR303.825E-T is slightly larger in width (5.00mm x 5.00mm versus 5.00mm x 4.60mm), so physical space constraints must be evaluated before implementation.

Q: What are the critical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: frequency (303.825 MHz exact match), operating temperature range (-40°C to 85°C minimum), mounting type (surface mount), and component type (SAW resonator). These parameters ensure the substitute functions identically within the circuit design.

Q: Why is the ASR303.825E-T recommended over other potential alternatives?

A: The ASR303.825E-T matches all mandatory parameters of the RO3104A and maintains active production status, ensuring availability and supply chain continuity. It also meets current ROHS3 compliance standards.

Q: Are there any package considerations when switching from RO3104A to ASR303.825E-T?

A: Yes. The ASR303.825E-T uses an 8-SMD package compared to the 4-SMD package of the RO3104A. The dimensional difference (5.00mm x 5.00mm versus 5.00mm x 4.60mm) requires PCB footprint redesign. Height difference is minimal (0.059" versus 0.063"), presenting no assembly clearance concerns.

Q: What is the moisture sensitivity classification for both components?

A: Both the RO3104A and ASR303.825E-T are classified as MSL 1 (Unlimited), indicating they require no special moisture control during storage or handling.