I-Button - Tag
DS1990A Series - Serial Number

The DS1990A Serial Number iButtonŽ is a rugged data carrier that serves as an electronic registration number for automatic identification. Data is transferred serially through the 1-WireŽ protocol, which requires only a single data lead and a ground return. Every DS1990A is factory lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability. The durable stainless-steel iButton package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS1990A to be used easily by human operators. Accessories permit the DS1990A iButton to be mounted on almost any object, including containers, pallets, and bags.


  • Can Be Read in Less Than 5ms
  • Operating Range: 2.8V to 6.0V, -40°C to +85°C
  • Unique Factory-Lasered 64-Bit Registration Number Assures Error-Free Device Selection and Absolute Traceability Because No Two Parts are Alike
  • Built-In Multidrop Controller for 1-Wire Net
  • Digital Identification by Momentary Contact
  • Data can be Accessed While Affixed to Object
  • Economically Communicates to Bus Master with a Single Digital Signal at 16.3kbps
  • Button Shape is Self-Aligning with Cup-Shaped Probes
  • Durable Stainless-Steel Case Engraved with Registration Number Withstands Harsh Environments
  • Easily Affixed with Self-Stick Adhesive Backing, Latched by its Flange, or Locked with a Ring Pressed Onto its Rim
  • Meets UL#913 (4th Edit.); Intrinsically Safe Apparatus: Approved Under Entity Concept for use in Class I, Division 1, Group A, B, C, and D Locations


Memory64 bits(8-bit CRC Code 48-bit Serial Number 8-bit Family Code)
Dimensions 17.35mm (Diameter) x 3.1mm (F3) or 5.9mm (F5) (Thick)
Weight 2.5 grams
Operating temperature -40°C to +85°C
Ordering Information and Pricing
Part Number Model Number Description RRP
[A] iButton
1-8050-900-1 DS1990A-F5 iButon Serial Number, 64 bit ROM $11.00 A
1-8050-901-0 DS1990A-F3 iButon Serial Number, 64 bit ROM $11.00 A
[B] Accessories
1-8059-010-0 KFOB-010 Key Fob (no button) - Black $4.29 A
[C] Key Fob Assemblies
1-8053-030-4 DS1990#3-FOB Ibutton FOB with DS1990A-F3 $19.80 A
1-8053-031-1 DS1990#5-FOB Ibutton FOB with DS1990A-F5 $19.80 A