6 models
iButton Serial-Number Keys
Read-only 64-bit ROM keys for access-control and intercom projects.
DS1990A-F5
DS1990A-F5 Serial Number iButton
A 64-bit ROM key in the F5 can, built to the DS1990A format.
DS1990A-F3
DS1990A-F3 Serial Number iButton
Same Ø16.25 mm diameter as the F5 in a slimmer 3.1 mm F3 can for flush mounting.
DS1990R-F5
DS1990R-F5 iButton (presence-pulse variant)
R-variant; the original manufacturer's datasheet describes a presence pulse on contact with a live bus.
TM1990A-F5
TM1990A-F5 Touch Memory Key
Fixed-ID Touch Memory key for equipment and access-control projects.
Reference price
US$0.25–0.50 per piece
Bulk order minimum: 500 pieces
TM-MAG
Magnetic Dallas Key (with holder)
DS1990A key pre-assembled into a magnetic-ring key fob.
TM-NMAG
Non-Magnetic Dallas Key
Standard fob assembly without the magnet ring.
Not sure which model fits?
Tell us the panel, intercom or lock you need to work with — send the model or a photo and we will help identify the part. Sample terms are confirmed by model.