RW2004 Rewritable Blank
Rewritable blank with memory area for extended-format keys.
The blank with a memory area. Where an RW1990 can only carry a 64-bit ID, the RW2004 (also sold as TM2004) adds writable EEPROM on top, so it can stand in for the memory-carrying credentials that some controllers expect rather than just a serial number. It uses its own write routine — copier firmware calls it the TM2004 protocol, distinct from both RW1990.1 and RW1990.2 — so the duplicator must list it explicitly.
The only rewritable blank with usable memory
Some controllers do not just read a key, they read what is written on it — a tenant record, a balance, a set of permissions. None of the ID-only blanks can serve those systems; the RW2004 can, because it carries a writable memory block alongside the programmable ID. Historically it also earned a reputation for patchy compatibility, which is precisely the gap RW1990 filled, so treat it as the specialist part: order it when the target system genuinely needs on-key memory, and use RW1990 or TM08v2 for everyday ID-only copying.
Key features
- Rewritable blank with an added writable memory area on top of the ID.
- Stands in for memory-carrying keys such as DS1996-class credentials some controllers expect.
- F5 can; programmable with standard TM equipment.
Specifications
| Chip / compatibility | RW2004 / TM2004 · rewritable ID + EEPROM memory area |
|---|---|
| Memory | Writable 64-bit ID plus a user-writable memory block |
| Protocol | Write protocol "TM2004" — a third routine, separate from RW1990.1 and RW1990.2 |
| Package | F5 can |
| Options | Also supplied in Dallas / Cyfral / Metakom multi-format versions |
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.
Which blank does your duplicator write?
Blanks differ less in the finished key than in how the copier writes them. Protocol names follow the routines used in mainstream and open-source duplicator firmware — check the blank list in your machine's manual before ordering.
| Model | Key format | Write protocol | Rewritable? | Pick it for |
|---|---|---|---|---|
| RW1990 | Dallas 1-Wire | RW1990.1 | Rewritable, ~10⁵ cycles | The safe default — every copier writes it |
| RW1990.2 | Dallas 1-Wire | RW1990.2 | Rewritable | When the copier lists ".2" specifically |
| TM-01A | Dallas 1-Wire | TM-01 | One-time only — locks after writing | Estates that ban re-writable duplicates |
| TM08v2 | Dallas + Cyfral + Metakom | RW1990.1 | Rewritable | One SKU for a mixed estate |
| RW2004 / TM2004 | Dallas 1-Wire (+ multi-format versions) | TM2004 | Rewritable + writable memory block | Controllers that read data, not just an ID |
| RW2000 | Cyfral / Metakom | RW2000 (~8 V) | One-time only — locks after writing | Cyfral & Metakom doors, tamper-proof copy |
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
When do I need RW2004 instead of RW1990?
When the system reads data from the key, not just its ID. An RW1990 carries a 64-bit serial number and nothing else; the RW2004 (also sold as TM2004) adds a writable memory block, which is what controllers expecting memory-carrying credentials need. It also uses its own TM2004 write routine, separate from RW1990.1 and RW1990.2, so confirm your duplicator lists TM2004 support before ordering.
Related products
RW1990 Rewritable Blank
The classic rewritable TM blank for duplicating services.
RW1990.2 Rewritable Blank
Revised RW1990 with wider duplicator compatibility.
TM-01A One-Time Copy Blank (Dallas OTP)
Copies a TM1990A / DS1990A once — then locks permanently, like an original.
TM08v2 Universal Blank
Latest-generation universal blank with the widest reader coverage.