Integrated 4-, 6- and 8-channel passive filter network with ESD protection

The devices are 4-, 6- and 8-channel RC low-pass filter arrays which are designed to provide filtering of undesired RF signals on the I/O ports of portable communication or computing devices. In addition, the devices incorporate diodes to provide protection to downstream components from ElectroStatic Discharge (ESD) voltages as high as ±30 kV.

The devices are fabricated using monolithic silicon technology and integrate up to eight resistors and sixteen diodes in a 0.4 mm pitch 8-, 12- or 16-pin ultra-thin leadless Quad Flat No-leads (QFN) plastic package with a height of 0.55 mm only.


  • Pb-free, Restriction of Hazardous Substances (RoHS) compliant and free of halogen and antimony (Dark Green compliant)
  • 4-, 6- and 8-channel integrated π-type RC filter network
  • ESD protection to ±30 kV contact discharge according to IEC 61000-4-2 far exceeding level 4
  • QFN plastic package with 0.4 mm pitch and 0.55 mm height

Target applications

General-purpose ElectroMagnetic Interference (EMI) and Radio-Frequency Interference (RFI) filtering and downstream ESD protection for:

  • Cellular phone and Personal Communication System (PCS) mobile handsets
  • Cordless telephones
  • Wireless data (WAN/LAN) systems
  • Mobile Internet Devices (MID)
  • Portable Media Players (PMP)


Type numberPackage versionPackage nameSize (mm)No of protected linesRline [typ] (Ohm)VRWM (V)Cd [typ] (pF)Ls(ch) [typ] (nH)VESD IEC61000-4-2 (kV)IRM [typ] ( µA)VBR [min] (V)S21 -3dB (MHz)
IP4251CZ16-8-TTLSOT974-2DFN3314-163.3 x 1.35 x 0.581005.6150.01150.15.8240


Type numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
SOT974-2Reel 7" Q1/T1, Q3/T4ActiveStandard MarkingIP4251CZ16-8-TTL,1
( 9340 646 78132 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
IP4251CZ16-8-TTLIP4251CZ16-8-TTL,1IP4251CZ16-8-TTLAlways Pb-free121.00.561.79E911
Quality and reliability disclaimer

Documentation (2)

File nameTitleTypeDate
IP4251_52_53_54-TTLIntegrated 4-, 6- and 8-channel passive filter network with ESD protectionData sheet2017-06-02
SOT974-2plastic, leadless thermal enhanced extremely thin small outline package; 16 terminals; 0.4 mm pitch; 3.3 mm x 1.35 mm x 0.5 mm bodyOutline drawing2018-06-03


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