Circuit protection against big transients; lower-profile gas-discharge tubes

September 30, 2015 // By Graham Prophet
Reducing device height by 75%, Bourns’ FLAT GDT (gas discharge tube) offers robust isolation and current-handling overvoltage protection capabilities.

Using a breakthrough flat package design and, says Bourns, setting a new standard in volume and space-saving circuit protection design, the 2-electrode Model 2017 Series FLAT GDT uses a breakthrough flat package and horizontal circuitry design to meet the more sensitive overvoltage protection requirements of high density and space-restricted applications such as telecommunications and industrial communications equipment, surge protective devices and PCB assemblies. The new series delivers a 75% savings in volume as compared to standard 8-mm Bourns GDTs. When vertically mounted, the Model 2017 Series is capable of locating approximately twice the number of GDTs in the same board space as compared to similar board space using surface mount 8 mm GDTs.

In addition to reducing height and overall volume, this GDT technology is able to maintain the device’s robust isolation and current-handling overvoltage protection capabilities. It offers superior surge current ratings, low leakage and insertion loss with constant capacitance regardless of voltage. These devices also do not impact signal or system operation due to their voltage limiting capabilities optimised for long-term reliability and performance.

The Model 2017 Series is an ITU K.12 Class III GDT device rated at 10 kA on an 8/20 μsec waveform. The series features DC breakdown voltages ranging from 90 to 500 V. Maximising its design flexibility, the FLAT GDT offers multiple mounting options including bottom-side PCB, and is available in horizontal and vertical surface mount versions as well as a leadless design for cartridge or clamp fit applications. Pricing is $ 0.48 (1,000).