iButton DS1990A-F5+ / TM1990A-F5 Key Tag (Button Only without Plastic Handle)

The DS1990A-F5+ / TM1990A-F5 iButton® key tag provides a guaranteed unique 16 character hexadecimal ID in a compact, durable iButton form. Designed for reliability and simplicity, it’s ideal for use in access control systems, inventory management, and work-in-progress tracking — or any application that requires a secure, low-cost method of validating identification. This tag operates as a read-only device with a 64-bit identification code, using the 1-Wire protocol to ensure accurate data transmission through a single conductor.

Constructed from high-quality stainless steel, the DS1990A-F5+ key offers exceptional resistance to magnetic and static fields. It is commonly used in door intercom systems, security systems, and access control systems where durability and performance are essential.

Please note: these are TM1990A-F5+ buttons, and they work almost identically to the DS1990A-F5+. If you are looking for DS1990A-F5+ buttons and handles, please see: DS1990A-F5+ iButton and DS9093A+ Plastic Fob Handle  

Specifications

• Format: TM (Touch Memory) iButton
• Identification Code: 64-bit (read only)
• Unique ID: 16 character serial number
• Lifetime: More than 10 years
• Dimensions (L × W): 59 × 19 mm
• Weight: 4 g (±3%) without handle
• Average Number of Readings: 1,000,000+ reads
• Material: Cover – Stainless steel
• Operating Temperature: −40°C to +85°C