Unidirectional and Bidirectional Transient Voltage Suppressor

Category: Diodes, Electronics, Microsemi Corp

Overview

The datasheet provided by Microsemi details the specifications and applications for unidirectional and bidirectional transient voltage suppressor devices. These devices are designated as High Reliability controlled units, available in a variety of models ranging from ML.SKE6.8A to MISKE400CA. They are suitable for through-hole mounting and cater to a wide range of standoff voltages, from 5.8 V to 324 V.

Features and Screening Levels

Surge protection: The devices can suppress transients up to 1500 watts, and are 100% surge-tested.
Upscreening options: Different levels of upscreening are available, indicated by the M, MA, MX, and MXL prefixes, aligning with MIL-PRF-19500 standards.
Surface mount options: Surface mount equivalent packages are also available.
Moisture classification: Classified as Level 1, no dry pack is needed per IPC/JEDEC J-STD-020B.
RoHS compliance: RoHS Compliant versions are offered by adding an “e3” suffix.
Standby current screening: A 30 lot norm screening is conducted.

Applications and Benefits

The devices are utilized for protection against switching transients, induced RF, Electrostatic Discharge (ESD), and Electrical Fast Transients (EFT) in line with IEC standards. They also serve as secondary lightning protectors, with various classes specified for differing Ohm source impedances.

Maximum Ratings and Characteristics

The suppressors are rated for a peak pulse power dissipation of 1500 watts at an ambient temperature of 25°C. The impulse repetition rate is capped at 0.01% or less. With a clamping time of less than 100 picoseconds for unidirectional and less than 5 nanoseconds for bidirectional, they ensure quick response times. The operating and storage temperature range for these suppressors is from -65°C to +150°C.

The thermal resistance is specified as 22°C/W from the junction to lead and 82°C/W from the junction to ambient. Steady-state power dissipation is noted as 5 watts at a lead temperature of 40°C or 1.52 watts at an ambient temperature of 25°C, based on mounting on an FR4 PC board. For unidirectional devices, a forward surge capacity of 200 Amps is available, with a peak impulse of an 8.3 millisecond half-sine wave at 25°C.

Soldering specifications: The devices can withstand solder temperatures of up to 260°C for a duration of 10 seconds.

Document Reference: This information is summarized from RFO1008 Rev C, dated September 2010, which is part of the High Reliability Product Group, page 1 of 4.