For more efficient electrical and electronic device protection against destructive higher power transient voltages, Littelfuse developed the AK series high current silicon transient suppressor.
The AK series replaces the ganging of between 40 and 150 5000 W silicon avalanche diodes (SAD), says Littlefuse, virtually eliminating manufacturing errors caused by incorrect board placement and connection of individual components thus reducing manufacturing costs. The series also simplifies design configuration and testing while increasing operating efficiency with less capacitance, leakage and resistance.
The AK series offers current handling up to 10 000 A (using 8/20 µs wave shape pulse as defined in IEC 61000.4.5) in a compact 16,5 mm leaded package. The configuration allows module manufacturers to fit high levels of surge capacity into smaller envelopes, for example, a 10 kA product in a slim DIN rail package. Littelfuse's exclusive 'Foldbak' technology further lowers clamping voltage levels below the diode's inherent avalanche state, providing increased protection levels.
Offered in both an AK6 (6 kA) and AK10 (10 kA) series, these devices are a good solution for AC line protection in susceptible applications such as TVSS panels, motor controls, UPS, and power conversion where both space and performance can be an issue. According to the company, the AK series has been shown to increase manufacturing yields by up to 10 times by eliminating placement errors and rework during the board assembly process. Because all series and parallel connections are optimised in one package, the series has lower slope resistance, lower lead capacitance and less leakage than discrete components.
The AK series exhibits as little as 2,0 nF of capacitance at up to 10 kHz and a very low clamping threshold, as little as 58 V. The devices offer bidirectional transient flow protection, with 'bleed through' leakage levels as low as 20 µA. Internal PN junctions are glass passivated for reliability.
For more information contact Stephen Delport, Hi-Q Electronics, 021 595 1307, [email protected]
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