Boone, N.C. TT electronics IRC Wire and Film Technologies Division has certified its HSF series surface-mount resistor meets or exceeds GR1089 lightning strike specifications. The HSF series resistor provides secondary lightning protection for board-level telecommunications applications.
The HSF series resistors feature a power rating of 1 W at 70°C and a working voltage of 350 V. The device is available in resistance values of 5.9 ohms (Ω), 11Ω, 27Ω, 68Ω, and 270Ω, with a tolerance of ±10%, and temperature coefficient of resistance (TCR) values to ±50 ppm/°C. The maximum operating temperature is 150°C. Custom specifications are available. Click here for the HSF series datasheet.
The HSF series offers telecommunications designers a surface-mount option for through-hole wirewound components that typically meet the GR1089 specification. "Not only does the HSF series resistor provide engineers with a smaller surface-mount option, but it is as capable of handling strong surges as many larger devices," said David Winkler, product manager for IRC's Wire and Film Technologies Division, in a statement. "Meeting the specifications of the lightning strike portion of the GR1089 standard gives engineers the reliability they need for their telecommunications equipment."
"Typical thick-film devices are more vulnerable to surges because the trimmed path of the resistive element provides a failure point where the resistor material narrows," Winkler stated. "The HSF series resistor is unspiraled, completely removing this failure mode under these types of strikes, even in the lower resistance values where power is maximized. When the components were subjected to 1000 V with the standard 10 x 1000 microsecond profile, the HSF products realized a resistance change of less than 0.2%." Click the link for more information about the surge products.
Typical pricing for the HSF series resistors is approximately $0.18 each in quantities of 10,000. Delivery is from stock to four to six weeks.
TT electronics IRC Wire and Film Technologies Division, 1-828-264-8861, www.ttelectronics.com and www.irctt.com