Vishay Intertechnology has announced a new range of components that integrate two positive temperature coefficient (PTC) thermistors into a single surface-mount package.
The Vishay BCcomponents 2322 673 xxxxx twin vertical SMD PTC devices are constructed from a ceramic disc, reflow soldered to a lead-frame. This physical construction results in a flat pick-up area of 30 mm2, which facilitates automated assembly.
In addition to reducing component count, the new 2322 673 xxxxx twin vertical SMD PTC devices can reduce the board space required to implement overload protection in telecommunications applications by up to 65%. Maximum voltage rating for the devices is 240 V, and components are available in variants with maximum trip times between 1.2 s and 4.0 s and maximum current ratings ranging from 2.5 A to 4.0 A.
Fully compatible with automated pick-and-place assembly, and suitable for use in lead-free soldering processes, the new components also help to reduce assembly time by providing pre-matched pairs of thermistors within the same package. According to Vishay, this eliminates the need for resistance matching.
The use of ceramic PTC technology is said to confer high stability, fast response and recovery times, and the ability to sustain several trip cycles. This in turn allows the devices to conform to the more stringent requirements of the ITU K20-21-45 Edition 2003 specification for overvoltage and overcurrent protection for telecommunications equipment.
All of the new devices are rated to function across the industrial temperature range of minus 40 to +85 degrees C. In addition to the standard products, Vishay can produce custom versions based on the PTC technology, on request.