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Protection IC tailored for power sourcing equipments

Posted: 01 Jul 2009 ?? ?Print Version ?Bookmark and Share

Keywords:protection IC? controller? power supply?

PEP01-5841 protection IC

STMicroelectronics has announced the first device providing both 1kV surge protection and clamping voltage compatible with the 100V power sourcing equipment (PSE) controller. The PEP01-5841 protection IC is used in PSE, such as PoE-enabled Ethernet switches or hubs, which drive the specified 48V supply onto the Ethernet cable.

PoE, or IEEE 802.3at, is the industry standard that enables VoIP phones, WLAN access points, RFID tag readers, sensors, and cameras to connect into a network even without a wall outlet for power. This reduces equipment costs as no external AC/DC power adapter is required, while enhancing convenience and flexibility for end users. In 2008, VDC Research Group predicted that annual shipments of PoE-enabled Ethernet switches will increase to over 132 million ports by 2012.

PoE power-supply circuitry in the Ethernet hub or switch can withstand transients on the power lines of up to 100V. Extra protection is necessary to prevent very high voltage surges, such as ESD or EOS, from damaging the power supply. Discrete components are usually used to clamp surges to a voltage below 121V (when specified), but the PEP01-5841 integrates a 100V clamping protection device and filtering capacitors for up to four PoE outputs in a single 5mm x 6mm component. This simplifies design and saves up to 55 percent of PCB space.

The PEP01-5841 is the first device providing 1kV surge protection as specified by IEC 61000-4-5 that also has a clamping voltage compatible with the 100V PSE controller. ESD protection satisfies worldwide standards including IEC 61000-4-2 and MIL-STD-883 Method 3015.

The PEP01-5841 is available in the industry-standard SO-8 package. Price is $0.25 in quantities of 10,000 pieces.

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