Circuit Protection for Audio

ON Semiconductor has integrated devices designed to suppress EMI/RFI noise for audio interfaces subjected to electromagnetic interferences. These filters includes ESD protection.

Audio EMI Suppression - Speaker/Headset
EMI Filter + ESD Protection


NUF2441FC: Integrated Passive Filter with ESD Protection

Typical Insertion Loss Curve

NUF2441FC Schematic Typical Insertion Loss Curve

Device Line Capacitance @ 2.5 V (pF) Series Inductance (nH) Series Resistance (Ω) Package/Size
L x W x H (mm)
NUF2441FCT1G* 250 2.9 0.28 CSP/1.7 x 1.2 x 0.7
NUF2450MUT2G 240 2.3 1.3 UDFN/1.8 x 1.2 x 0.5


Audio and I/O Interface Protection with EMI Supression


Typical Insertion Loss Curve - CM1242-33

Typical Insertion Loss Curve

Device Nominal Capacitance (pF) Attenuation @ 1 GHz (–dBm) Configuration Package
CM242-33 55 >20 Bidirectional 0201 DSN
ESD5484 35 >15 Bidirectional 0201 DSN

Application Operating Frequencies Benefit
Audio Line Protection 200 to 30,000 Hz Prevents audio and I/O harmonics from interfering with wireless
Analog I/O <5 MHz
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