A Dog’s RF Tag Fails – Is RoHS the Culprit?
Over two million pets in the UK have an idENTICHIP RF tag in the scruff of their neck that works as a kind of electronic ID tag. So what are the chances that two new devices based on the same technology — which has had a good track record up until now — would fail in three different dogs (including Barney, shown here with his pal Georgia, who coincidentally lives next door to one of the other dogs). And then to have those same devices weirdly and spontaneously rectify themselves after “xray”‘ investigations? The odds must be, well, big enough to be almost impossible.
And that got Barney’s owner, an engineer named Roger Unwin who works in the electroncis industry, wondering if by chance the device maker was caught up in unintended consequences of the new lead free regulations for the electronics industry? Could it perhaps have started using lead-free solder — in compliance with RoHS regulations that went into effect in July 2007 — for any of the connections on the miniature device? If that were the case (which the manufacturer ultimately did confirm), he speculates that tin whiskers could well be to blame for the problem. The subject of tin whiskers has been a source of controversy in the design engineering community, with blogs and forums frantically abuzz on the topic noisily on the topic, as evident in the popular Pushback, an anti-lead-free site. “If the xray process used to locate the devices works by emitting electrical / EMF energy it might have been sufficient to destroy a whisker in a similar way to a fuse blowing,” says Unwin. Barney got lucky. Unwin’s vet initially indicated that the failed chip might have to be removed but after further investigations the vet discovered a second could abe implanted and did it FOC. The neighbor’s dog, Algie, was a less fortunate — she was impounded by authorities when her chip failed to work and had to endure a procedure to remove the failed chip. A third dog, Coco, who lives 20 miles away from the other two also came up with a failed chip. Only poor Coco was impounded in Calais, France by authorities when her chip failed.