Magnetic Dallas Key (with holder)
DS1990A key pre-assembled into a magnetic-ring key fob.
The "touch and hold" format: the key is fitted with a magnetic ring so it seats and stays on the reader contact. Supplied assembled and ready to distribute, in your choice of housing colour.
Key features
- “Touch and hold” format — a steel magnet ring seats the key on the contact and keeps it there for a first-touch read.
- DS1990A-compatible key pre-assembled into the fob — shipped ready to distribute.
- 12 stock housing colours, logo printing, custom fob shape on volume order.
Specifications
| Chip / compatibility | DS1990A compatible · factory model TMK-TM1990-R (iron-ring card) |
|---|---|
| Package | F5 key + iron retention ring + plastic fob — mates with magnetic readers |
| Mounting | Key ring / lanyard |
| Options | Logo printing, 10+ colours, custom fob shape |
Inside the stainless can
A 0.25 mm solid stainless shell, a UV-stable polypropylene grommet isolating lid from base, and the die bonded inside. Lid = data contact, base = ground return.
Ordering information
| MOQ | 100 pcs |
|---|---|
| Lead time | 3–7 days for stock items, 10–15 days for OEM |
| Packing | Bulk ESD bags (100–200 pcs/bag, 2 bags/carton); blister or header cards for retail on request |
| Samples | Free samples for volume buyers — courier at cost |
| Payment | T/T bank transfer; other terms negotiable for repeat orders |
| Shipping | DHL / FedEx / UPS air express; sea or rail freight for pallet volumes |
| Customization | ROM ranges · housing colours · laser logo · private label |
Typical applications
Frequently asked questions
What does the magnetic ring on this key actually do?
The iron retention ring seats the key on a magnetic reader contact and holds it there — a first-touch read with no pressing or aligning. That matters on outdoor intercom panels and for users who struggle to hold a key steady.
Does it also work on ordinary, non-magnetic readers?
Yes. Electrically it is a DS1990A-class key — the magnet only adds mechanical retention on magnetic readers. On a plain probe it reads like any other Touch Memory key.
Is it supplied assembled, and can the fob be customised?
Supplied pre-assembled — key, iron ring and fob (factory model TMK-TM1990-R) — ready to distribute. Ten-plus housing colours, logo printing and custom fob shapes are available on volume orders; MOQ 100 pcs.
Related products
DS1990A-F5 Serial Number iButton
The industry-standard 64-bit ROM key in the F5 can.
DS1990A-F3 Serial Number iButton
Same silicon as F5 in the slimmer 3.1 mm F3 can for flush mounting.
DS1990R-F5 iButton (guaranteed presence pulse)
R-variant that guarantees a presence pulse the instant the key touches a live bus.
TM1990A-F5 Touch Memory Key
Cost-optimised DS1990A equivalent — the volume workhorse for intercom keys.