SF2049E Equivalent & Substitute Parts

Part Overview

The SF2049E is a 915MHz Surface Acoustic Wave (SAW) filter manufactured by Murata Electronics, designed for ISM band applications. This component features a 26MHz bandwidth with 2.2dB insertion loss in a compact 6-SMD, No Lead package measuring 3.00mm x 3.00mm. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Substiute Parts

SF2049E

Murata ElectronicsIn Stock: 108785SF2049E Datasheet

Current PartRFQ

B39921B3588U410

Qualcomm (RF front-end (RFFE) filters)In Stock: 5303B39921B3588U410 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SF2049E is determined by the following critical parameters:

• Frequency - Center: Must be 915MHz
• Bandwidth: Must be 26MHz
• Package / Case: Must be 6-SMD, No Lead
• Size / Dimension: Must be 0.118" L x 0.118" W (3.00mm x 3.00mm)
• Mounting Type: Must be Surface Mount
• RoHS Status: Must be ROHS3 Compliant

The B39921B3588U410 meets all mandatory substitution criteria. Variations in insertion loss (2.9dB vs. 2.2dB) and height (0.043" vs. 0.054") remain within acceptable tolerances for the 915MHz SAW filter category and do not preclude functional equivalence in ISM and remote control applications.

Parameter Comparison

Engineering Selection Recommendations

The B39921B3588U410 is a direct functional equivalent for the obsolete SF2049E. Both components share identical center frequency (915MHz), bandwidth (26MHz), package geometry (6-SMD, No Lead, 3.00mm x 3.00mm), and regulatory compliance (ROHS3). The B39921B3588U410 carries AEC-Q200 automotive qualification and maintains active production status, ensuring long-term availability and supply chain stability. The insertion loss differential of 0.7dB and reduced height profile of the B39921B3588U410 represent minor performance variations that do not compromise substitution validity for ISM and remote control applications.

Frequently Asked Questions (FAQ)

Q: Can the B39921B3588U410 replace the SF2049E in existing designs?

A: Yes. Both parts operate at 915MHz with 26MHz bandwidth in identical 6-SMD, No Lead packages with matching footprints (3.00mm x 3.00mm). The insertion loss difference (0.7dB) must be evaluated within the context of system gain budgets and link margin calculations.

Q: What is the significance of the insertion loss difference?

A: The SF2049E specifies 2.2dB insertion loss while the B39921B3588U410 specifies 2.9dB. This 0.7dB difference represents a measurable but typically manageable variation in RF signal attenuation. System-level impact depends on receiver sensitivity, transmitter power, and overall link budget allocation.

Q: Are the physical dimensions compatible?

A: Yes. Both parts use identical footprint dimensions (0.118" L x 0.118" W / 3.00mm x 3.00mm). The B39921B3588U410 has a lower maximum height (0.043" vs. 0.054"), which provides additional PCB layout flexibility without creating compatibility issues.

Q: What compliance certifications apply?

A: Both parts are ROHS3 compliant with MSL 1 (Unlimited moisture sensitivity level). The B39921B3588U410 additionally carries AEC-Q200 automotive qualification and REACH Unaffected status.

Q: Why is the SF2049E listed as obsolete?

A: Murata has discontinued the SF2049E product line. The B39921B3588U410 represents an active, production-supported alternative that maintains functional and physical compatibility.