Camarillo, Calif. Semtech Corp. has expanded its RailClamp protection family with two new ultra-low capacitance devices designed to protect data interfaces operating at speeds higher than 2 GHz. The new RClamp 0502B and RClamp 0514M protect 2 lines and 4 lines, respectively, with a typical line-to-line capacitance of 0.7 pF, which make them suitable for HDMI applications such as plasma displays, high definition TVs, and set-top boxes.
The HDMI Compliance Test Specification (CTS) requires sink (receiver) ports maintain a differential impedance of 100Ω ±15%. Too much added capacitance will cause the impedance of the differential pair to drop, said the company. By offering low capacitance, the RClamp0502B and RClamp0514M meet this stringent specification, while providing a high level of protection against electrostatic discharge (ESD) and cable discharge events (CDE). In addition, neither device is said to require impedance compensation, such as common mode chokes, to meet the HDMI CTS requirements.
Both the RClamp0502B and RClamp0514M devices feature extremely low clamping voltage for superior protection of sensitive ICs in high ESD threat environments, and the solid-state design ensures protection against repeated strikes without degradation or damage. They meet IEC 61000-4-2 specification (±15 kV air and ±8 kV contact) for protection against ESD, and exhibit no insertion loss to 3 GHz (line-to-line).
These devices also feature a flow through design for ease of layout. The pins of the RClamp0514M are spaced at a 0.5-mm pitch for reducing discontinuities on high-speed lines. The RClamp0502B also has a flow through design and protects one differential pair with the capability to separate clock and data pins.
The RClamp0514M device is offered in a 5 x 3.1 x 1.1-mm MSOP-10 package, while the RClamp0502B device comes housed in a 1.7 x 1.75 x 0.9 mm SC-75 package. Both devices are lead free and meet the European Union’s Restriction on Hazardous Substances in Electrical and Electronic Equipment (RoHS) directive.
The RClamp0502B, ordering code RClamp0502B.TCT, is priced at $0.28 each in quantities o f 1,000. The RClamp0514M, ordering code RClamp0514M.TBT, is priced at $0.52 each in quantities of 1,000. Both devices are available now in production quantities.
Semtech Corp., 1-805-498-2111, www.semtech.com