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Catalog/Ferrite beads/742792025

ORIGINAL COMPONENT

742792025

Würth Elektronik · 120 Ω at 100 MHz power-line ferrite · 0805 (2012 metric)

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Original component and up to three alternatives
SpecificationOriginal742792025Würth ElektronikAlternative 1BLM21PG121SN1DMurataAlternative 2No verified matchAlternative 3No verified match
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ReviewOriginal part Needs engineering review——
Package0805 (2012 metric)0805 (2012 metric)——
Impedance at 100 MHz120 Ω120 Ω——
Tolerance±25%±25%——
DC resistance (max)20 mΩ30 mΩ——
Rated current3 A at ΔT = 20 K; 5 A at ΔT = 40 K3 A (check manufacturer derating)——
Details
Datasheets

Würth ferrite datasheetChecked 25 Sep 2026 · 1–2

Differences & datasheets
  • Candidate DCR is 30 mΩ versus 20 mΩ, increasing voltage drop and heating.
  • Current ratings use different conditions; the original permits 5 A at a 40 K rise, while the candidate is listed at 3 A.
  • Reject if the circuit requires the original's 5 A capability. Verify the candidate's temperature derating below 3 A.
  • Recheck EMI attenuation under DC bias and operating frequency.
  • Impedance-versus-frequency and bias curves, temperature rise and EMC performance in this board have not been validated.

Murata ferrite specification listChecked 25 Sep 2026 · BLM21PG121SN1 row

LCSC exact ordering code and specificationsChecked 25 Sep 2026 · Product specifications

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Original datasheet

Würth ferrite datasheetChecked 25 Sep 2026 · 1–2

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