Raleigh, N.C. Helping designers convert more through-hole devices on their circuit boards to surface-mount components, the new SMX series of molded metal oxide resistors from Stackpole Electronics Inc. provides a surface-mount option in power ratings up to 3 watts for higher power circuit designs.
These SMX series rugged power resistors are direct replacements for axial-leaded resistors. The series is available with resistance values from 3 KΩ to 1 MΩ in tolerances of ±5%, and temperature coefficient of resistance (TCR) ratings of ±200 ppm/°C. The operating temperature is -50°C to 150°C and the maximum pulse voltage is 800 volts.
The SMX series also uses a unique J-lead termination, which provides excellent thermal coefficient of expansion (TCE) ratio matching, because it allows for greater expansion and contraction, said the company. "Thermal coefficient of expansion is always a consideration in surface-mount designs. Many engineers are hesitant to use SMD chip resistors larger than a 2010 size because thermal stresses and flex board designs often cause the components to crack or the solder joints to fail," said Kory Schroeder, product engineering manager for Stackpole, in a statement.
These devices may be used in a wide range of automotive, computer, power supply, telecommunication, industrial and instrumentation applications.
Typical pricing for a SMX resistor is $0.25 each in production quantities with lead times from six weeks. Samples are available in four to six weeks.
Stackpole Electronics Inc., 1-919-850-9500, www.seielect.com