EAC's reed relay, model #SMRR2-5-150, a six leaded device, is designed for use in ATE equipment. The relay is especially suited for use as a switch between the object to be tested and the equipment used to perform the test. It performs this duty well, due to it's inherently high insulation resistance and ultra low capacitance to ground along with an extraordinarily small dielectric absorption factor.

The switch used in the SMRR2-5-150 relay uses a contact material that is capable of actually switching many hundreds of millions of operations at the TTL or lower levels without exhibiting a "stick" or a "miss" or even exhibiting any significant change in contact resistance over life.

The SMRR2-5-150, while designed to function at very low levels of switching can actually handle brief hot switching excursions to power levels of 15 watts and return to normal levels without significant changes in performance.

The low profile of the SMRR2-5-150 reed relay (.205 in.) coupled with an entirely enclosed electrostatic and magnetic shield make it the obvious choice for those tight squeezes in high count VLSI applications where closeness of components and adjacent boards is critical.

The SMRR2-5-150 meets all requirements of the standard 52 ohm line impedance so that signal losses are minimized.

The SMRR2-5-150 is encapsulated in an epoxy package, designed to withstand the rigors of reflow soldering, be it IR or chemical. The top of the relay is flat making it ideal for the popular pick and place robotic component placement machinery.

Some General Theory

When one looks at the graph below, one becomes a believer in the EAC SMRR2-5-150. A pulse, looking at the left of the graph, has been sent down a transmission line and has been reflected back. A very slight discontinuity is shown in the area of the vertical dotted lines. The actual results of the test to the SMRR2-5-150 are recorded at the bottom of the graph.

The equipment used to gather the data is manufactured by the Hewlett Packard Corporation, namely a HP 54120 (fast TDR 'Scope).

Further information regarding testing of these relays is on file at EAC.

Graph showing the performance of the SMRR2.

The SMRR2-5-150 Reliability Program

Rigorous pre-testing of the reed switch under actual low level operating conditions is just the first step in EAC's continuing efforts to build the most reliable reed relays in the industry. The coils of the SMRR2-5-150 for example must pass no less than three inspections prior to reaching the area of final assembly. In addition, each major construction operation is monitored by experienced inspectors who take pride in helping produce the most reliable relays technically possible.

100% testing of the reed switch, statically and dynamically for contact resistance stability is the by-word. Only those switches that meet the criteria are allowed to be used as the heart of the SMRR2-5-150.

100% testing of the relay for contact resistance stability, pull-in value, drop-out value, and coil resistance at the final test stage insure that each SMRR2-5-150 will perform to published specifications.

EAC's quality assurance program meets all criteria of the Total Quality Control concepts as envisioned by the largest manufacturers of ATE equipment.