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DS1990R-F5# iButton®

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£1.83 exc. VAT

1 - 9£1.83 Per Item
10 - 24£1.74 Per Item
25 - 49£1.65 Per Item
50 - 99£1.56 Per Item
100 - 249£1.46 Per Item
250 - 999£1.40 Per Item
1000 - 2999£1.35 Per Item
3000 - 4999£1.30 Per Item
5000 - 10000£1.25 Per Item


An Authentic Dallas/Maxim Read Only Memory serial number with presence detect iButton® communicating via a 1Wire® Protocol. 

SKU: DS1990R-F5# Category: Tag:


The DS1990R Serial Number iButton®  is a rugged data carrier that serves as an electronic registration number for automatic identification.

Data is transferred serially through the 1-Wireprotocol, which requires only a single data lead and a ground return. Every DS1990R 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 DS1990R to be used easily by human operators. Accessories permit the DS1990R iButton® to be mounted on almost any object, including containers, pallets, and bags. The DS1990R is a fully compatible variant of the DS1990A. In applications where a presence pulse on contact is critical the DS1990R should be preferred over the DS1990A.

If required inserted into a Plastic FOB, please refer to YSL90Rxxx for Non-Magnetic Key or YSL90RMAGxxx for Magnetic Key where xxx directs to a Colour choice.



  • Access Control
  • Work-In-Progress Tracking
  • Tool Management
  • Inventory Control


  • Upgrade of DS1990A Guarantees Presence Pulse on Contact
  • 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
  • Presence Detector Acknowledges when Reader First Applies Voltage

Manufactured in the UK

Dallas/Maxim iButton Accredited

Authentic iButtons only

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