The DS9094SM is a low-cost, surface mount device that retains a 16.3 mm iButton on a printed circuit board. Two springs that double as ground contacts press the iButton to the data pad on the printed circuit board. The iButton can be inserted and extracted without special tools. For best results the data contact on the printed circuit board should be plated with a layer of minimum 0.76 m hard gold over minimum 3.81 m nickel.