{"id":2813,"date":"2023-03-14T14:15:39","date_gmt":"2023-03-14T06:15:39","guid":{"rendered":"https:\/\/www.toptaggroup.com\/products\/tm1990a-f5-ibutton-keys-tag-2\/"},"modified":"2026-07-08T22:24:42","modified_gmt":"2026-07-08T14:24:42","slug":"tm1990a-f5-ibutton-keys-tag","status":"publish","type":"products","link":"https:\/\/www.toptaggroup.com\/de\/products\/tm1990a-f5-ibutton-keys-tag\/","title":{"rendered":"Proven Ibutton Keys Tag for Access Control \u2014 Permanent Read-Only 1-Wire Access Fob for Apartments & Fleets"},"content":{"rendered":"

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Permanent Read-Only iButton Key Tag \u2014 Factory-Burned UID, Zero Battery, 10-Year Life<\/h2>\n

For access control integrators and fleet telematics operators<\/strong> who issue one iButton key tag per person and need that key to stay locked for life.<\/p>\n

Every TM1990A-F5 iButton key tag leaves the fab with its identity permanently set. The 64-bit ROM ID \u2014 an 8-bit family code, a 48-bit serial, and an 8-bit CRC \u2014 is laser-written into the silicon during production and will not change for any reader, any programmer, or any weather condition<\/strong> over a decade or more of daily use. This is the credential you order when a tenant key stays with apartment A-12 for half a decade, a driver badge belongs to one employee for their entire tenure, or a building checkpoint is bolted to a wall once and never re-tagged.<\/p>\n

The hardware inside is deliberately minimal: a 16.25 mm F5 stainless disc crimped into a 40 mm ABS handle. No battery. No capacitor. No moving part. The silicon die draws parasitic power from the 1-Wire data line the instant the disc face touches a chrome probe \u2014 the reader supplies both voltage and the clock reference. The UID is clocked out in under five milliseconds at overdrive speed. The assembly reads at \u221240\u00b0C in a Siberian garage, at +75\u00b0C on a Dubai parking gate, and through snow, mud, and thick work gloves that would defeat any optical or fingerprint scanner.<\/p>\n

Because the UID is immutable, this particular access token solves one problem that a writable credential cannot: zero risk of a departing employee or tenant tampering with their iButton key tag to match a new valid UID.<\/strong> In a read-only chip, the identity is physically burned \u2014 it cannot be erased, reprogrammed, or spoofed by any handheld tool in the field. The security model is not \u201ctrust the software lock\u201d but \u201cthe hardware itself refuses to change.\u201d For a multi-building residential portfolio, a corporate campus with high turnover, or a fleet where driver assignment is audited monthly, this distinction matters at scale.<\/p>\n

This iButton Key Tag vs the Writable Version \u2014 Know the Difference<\/h2>\n
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\"Magnetic
\u00a0<\/figcaption><\/figure>
The TM1990A-F5 iButton key tag \u2014 factory-burned UID, F5 MicroCan, 40 mm ABS paddle.<\/figcaption><\/figure>\n

Confused between the TM1990A-F5 iButton key tag and the RW1990? The distinction boils down to one question: does the credential ever need to be re-assigned to a different person?<\/strong><\/p>\n\n\n\n\n\n\n\n
<\/th>\nTM1990A-F5 (this page)<\/th>\nRW1990 (writable)<\/th>\n<\/tr>\n
UID behaviour<\/td>\nPermanent. Fab-burned. Cannot be altered.<\/td>\nRe-programmable via TM handheld tool<\/td>\n<\/tr>\n
Who buys it<\/td>\nProperty managers, fleet ops, factory HR \u2014 one person, one fob, done<\/td>\nLocksmiths, rotating-tenant landlords \u2014 monthly re-issue cycle<\/td>\n<\/tr>\n
Security model<\/td>\nHardware immutability \u2014 the chip itself refuses to change. No software lock needed.<\/td>\nWrite-lock flag \u2014 the programmer writes then locks. Lock can sometimes be factory-reset.<\/td>\n<\/tr>\n
Unit lifecycle<\/td>\nFixed assignment. Key is de-authorised in software when the person leaves, not re-written.<\/td>\nRotating assignment. UID is overwritten on the same piece of hardware when a new tenant arrives.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

If your deployment reads the UID once, stores it in an access panel database, and never needs to physically change the chip \u2014 this is the correct product. If every new tenant means a site visit with a programmer in hand \u2014 see the RW1990 page instead.<\/p>\n

Three Deployments Where the iButton Key Tag Works<\/h2>\n
\"ibutton
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Residential door access at scale<\/h3>\n

A residential integrator in Warsaw codes TM1990A-F5 tokens by handle colour: green for Block A, red for Block B, blue for maintenance staff. An Iron Logic Matrix-II panel at each lobby entrance reads the factory UID on first touch, checks it against the authorised list, and opens or denies within a few hundred milliseconds. The panel logs every entry attempt by UID and timestamp \u2014 a property manager with 12 buildings can audit access across the entire portfolio from one screen.<\/p>\n

When a tenant moves out, the manager de-authorises the old UID in the panel database \u2014 ten seconds of software work. A new fob from spare stock gets registered to the apartment and handed to the incoming tenant. The departed tenant still holds a physical token, but it opens nothing. No re-programming tool on-site. No risk of the former tenant cloning a valid key. This workflow is why almost every residential integrator we supply defaults to this credential over the writable alternative for permanent tenant assignments.<\/p>\n

Driver identification at engine start<\/h3>\n

A Teltonika FMB120 telematics terminal in a 200-truck fleet carries a 1-Wire probe reader mounted on the dashboard, within arm\u2019s reach of the driver\u2019s seat. Each driver clips a colour-coded TM1990A-F5 paddle to their personal key ring \u2014 blue for day shift, red for night \u2014 and touches it to the chrome disc at the start of every shift.<\/p>\n

The FMB120 captures the 64-bit UID, timestamps the ignition event to the millisecond, and streams the data over the cellular network to the fleet back-end \u2014 Wialon, Navixy, or Traccar, depending on which platform the fleet operator uses. The fleet manager now has a per-vehicle, per-driver, per-shift audit trail: who drove unit 47, for how long, at what speed, inside or outside the geofence. Driver performance, fuel consumption, and overtime hours are automatically attributed to the correct individual without manual log sheets or dashboard PIN entry that can be shared.<\/p>\n

The TM1990A-F5 wins here because one driver keeps the same fob for years. The credential lives on a key ring, goes home at night, and returns to the dashboard the next morning. No battery to degrade in summer cabin heat. No RFID field to interfere with the truck\u2019s CAN bus. No risk of two drivers swapping fobs to game the system \u2014 the UID is permanently locked to one person, and a colour mismatch is spotted at a glance.<\/p>\n

Employee attendance clocking<\/h3>\n

A factory in Shenzhen with 800 workers on three shifts deploys ZKTeco inBio terminals at six entrances. Every employee touches a TM1990A-F5 paddle to clock in and out. The burned UID cannot be cloned by a late-arriving colleague trying to clock in for someone else. No fingerprint hygiene issue common in chemical or food-handling factories. No PIN sharing. No face-recognition failures under a mask or safety goggles. The ABS handle carries a silk-print logo and a laser-etched employee number \u2014 corporate-lobby professional, factory-floor durable. After three years of daily use, the MicroCan still reads at 100% on the same reader it was paired with on day one.<\/p>\n

Compatible Reader Families \u2014 What This Fob Plugs Into<\/h2>\n

Because the TM1990A-F5 speaks the Dallas\/Maxim 1-Wire protocol<\/a> at both 15 kbps (standard) and 142 kbps (overdrive), it works with any reader that has a 1-Wire bus \u2014 a dedicated iButton probe port or a Wiegand-to-1-Wire converter board. The table below covers the readers that integrators most frequently pair with this access token.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Leser<\/th>\nWhere it is installed<\/th>\n<\/tr>\n
Iron Logic Matrix-II EH \/ K<\/td>\nApartment lobbies, gated communities across CIS<\/td>\n<\/tr>\n
Bolid S2000-Proxy<\/td>\nCommercial offices, industrial gatehouses<\/td>\n<\/tr>\n
Rubezh R3-Reader-1W<\/td>\nBudget residential blocks, small offices<\/td>\n<\/tr>\n
ZKTeco inBio \/ Anviz C2<\/td>\nHR attendance terminals worldwide<\/td>\n<\/tr>\n
Teltonika FMB120 \/ FMB640<\/td>\nVehicle dashboards \u2014 fleet telematics<\/td>\n<\/tr>\n
Ruptela FM-Pro4<\/td>\nDriver authentication in EU-regulated fleets<\/td>\n<\/tr>\n
Generic panel-mount chrome probe<\/td>\nCustom panels, OEM vending machines, coffee dispensers<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Credentials and readers on one PO:<\/strong> Impedance-matched 1-Wire chrome probe ships on the same packing list with the same lot trace. TM 1-Wire probe reader \u2192<\/a><\/div>\n

When NOT to Buy This Product<\/h2>\n

Honesty saves both sides time. Do not order the TM1990A-F5 if:<\/p>\n