Switch on anything from a laptop to a washing machine, an industrial furnace or a military-grade radio transmitter, and the chances are you will activate a high-tech sensor or controller made by US multinational Microchip Technology at its factories dotted around the world – from its headquarters outside Phoenix, Arizona to its Irish plant in Ennis, Co Clare. The group’s main subsidiary here, Microchip Technology Ireland Ltd, has its head office alongside other international tech companies in the East Point Business Park next to Dublin Port. It has just filed documents declaring the issue of one new ordinary share with…