Camarillo, Calif. Semtech Corp. has expanded its EClamp family of protection devices with the addition of the EClamp3343C, a protection device that works with both upstream and downstream USB 2.0 (full speed) and on-the-go (OTG) ports in portable electronics and peripherals. The new device protects USB ports from electrostatic discharge (ESD) and electromagnetic interference (EMI).
The company says its the only USB protection device on the market with terminating 1.5 kOhm pull-up and 15 kOhm pull-down resistors that allow it to identify the type of port it is supporting. It meets USB 1.1, 2.0 and OTG requirements for termination.
The EClamp3343C also integrates a 33-ohm series termination resistor for impedance matching, and, unlike other devices, this product allows for a separate connection from the 3.3-V supply to the pull-up resistor for full compliance to the USB specification.
The company also offers the EClamp 2343C for designs requiring a 23-ohm series termination. The new device delivers high attenuation of -35 dB across 900 MHz to 1.9 GHz cellular frequencies.
Because USB is a plug-and-play standard, ESD and EMI are particular threats to USB ports due to the increased vulnerability on the data, voltage and ID pins to fatal charges from a user plugging in a charged cable, said the company. The EClamp 3343C is in full compliance to the ESD standard, IEC 61000-4-2, Level 4 (±8kV contact and ±5kV air discharge). ESD protection is provided by TVS diodes on D+, D-, Vbus and the ID pin for OTG designs.
The EClamp3343C comes standard with Semtech's exclusive non-conductive back coating technology that offers increased mechanical durability, improves marking, and is compliant with UL 94V-0 flammability requirements. A lead-free version is available.
In addition, the EClamp's high level of integration in combination with its small size 1.96 x 1.33 x 0.65 mm, 11-bump flip chip makes it suitable for applications with limited board space. And by replacing up to 11 discrete components, it reduces the need to qualify and inventory multiple devices, resulting in a speedier time to market and lower costs.
The EClamp3343C is priced at $0.40 each in quantities of 10,000. The part number for lead solder bumps is EClamp3343C.WC, and EClamp3343C.WCT for lead-free solder bumps. Evaluation kits and samples are available.
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