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STF701 T-Filter with TVS Diode Array For EMI Filtering and ESD Protection

PROTECTION PRODUCTS Description

Features

The STF701 is a low pass T-filter with integrated TVS diodes. It is designed to provide bi-directional filtering of unwanted EMI/RFI signals and electrostatic dis- charge (ESD) protection in portable electronic equip- ment. Each device will provide filtering and protection for two I/O lines.

The STF701 is constructed using thin-film-on-silicon technology. The device has very low insertion loss in the pass band (to approximately 10MHz) and good attenuation at high frequencies (approximately 100MHz to 1GHz). Each line features two stages of TVS diode protection. The TVS diodes provide effec- tive suppression of ESD voltages in excess of ±15kV (air discharge) and ±8kV (contact discharge) per IEC 61000-4-2, level 4.

The clamping characteristics of the device are opti- mized by the use of two TVS diodes. The TVS diodes serve a dual purpose of protecting the internal capaci- tor and the sensitive IC connected to the line. The voltage divider action of the circuit means the voltage across the protected IC will be very close to the break- down voltage (VBR) of the second TVS.

The small size and integrated feature of the STF701 minimizes required board space and increases system reliability. The STF701 is suitable for use in portable communications devices such as cellular handsets and accessory kits.

  • Bidirectional EMI/RFI filtering with integrated ESD

protection

  • ESD protection to

IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact) IEC 61000-4-4 (EFT) 40A (5/50ns)

  • Filtering and ESD protection for two data lines

  • Low insertion loss to 10MHz

  • Good attenuation of high frequency signals

  • Low TVS operating voltage (5V)

  • Low clamping voltage

  • Low leakage current

  • Thin-film-on-silicon technology

Mechanical Characteristics

  • EIAJ SC70-5L package

  • Molding compound flammability rating: UL 94V-0

  • Marking : 701

  • Packaging : Tape and Reel per EIA 481

Applications

  • Cell phone handsets

  • Cell phone accessories

  • RF Communications equipment

  • Laptop Computers

  • Two-way pagers

  • GPS Devices

Circuit Diagram

Schematic & PIN Configuration

SC70-5L (Top View)

Revision 04/18/03

1

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