iButton Dallas Key | RW1990 / DS1990A 1-Wire
Protocol:1-Wire® (Dallas/Maxim)
Color:Various colors
Application:Access control attendance
Product name:Ibutton dallas key
Multi-Chip 1-Wire Touch Memory Key for Professional Applications
SynTek's iButton Dallas Key delivers unmatched flexibility with three chip options in a single product line. Whether you need read-only identification with DS1990A-F5 or rewritable capability with RW1990, our touch memory keys provide reliable contact-based data transfer for demanding access control environments.
Built around the industry-standard 1-Wire protocol, these electronic keys require only a single data line plus ground for communication, dramatically simplifying installation for building access control systems, GPS fleet driver identification, and guard tour patrol verification.
iButton Dallas Key Specifications
Complete technical parameters for 1-Wire touch memory electronic keys with multiple chip configurations
| Parameter | Specification |
|---|---|
| Available Chips | RW1990 (Rewritable)| DS1990A-F5 (Read-Only) |TM1990A-F5 (Read-Only) |
| Communication Protocol | 1-Wire® (Dallas/Maxim Compatible) |
| Memory Type | 64-bit Unique ROM Code (Laser-Etched) |
| Data Transfer Speed | 16.3 kbps (Standard Mode) |
| Read Time | < 5 ms (Momentary Contact) |
| Button Dimensions | Ø16.25mm × 5.89mm (F5 Package) |
| Key Fob Dimensions | Handle: 40mm × 15mm (With Button) |
| Button Material | 304 Stainless Steel (Polished) |
| Handle Material | ABS Plastic (Multiple Colors) |
| Operating Temperature | -40°C to +85°C |
| Supply Voltage | 2.8V to 6.0V (Parasitic Power) |
| Data Retention | > 10 Years (No Battery Required) |
| Environmental Rating | Dust, Moisture, Shock Resistant |
| Durability | 10-Year Wear Tested |
| Customization Options | Laser Engraving, Logo Printing, UID Pre-Programming |
Compare iButton Chip Models
Choose the right touch memory chip for your 1-Wire access control or identification application
| Feature | RW1990 (Rewritable) | DS1990A-F5 (Read-Only) | TM1990A-F5 (Read-Only) |
|---|---|---|---|
| Memory Type | Read/Write 64-bit | Read-Only 64-bit ROM | Read-Only 64-bit ROM |
| Programming | ✓ Field Programmable | Factory Laser-Etched | Factory Laser-Etched |
| Key Cloning | ✓ Supports Cloning | Not Clonable | Not Clonable |
| Primary Use Case | Intercom Key Replacement | Secure Access Control | Time Attendance Systems |
| Security Level | Standard | High (Unique ID) | High (Unique ID) |
| Cost | Budget-Friendly | Mid-Range | Mid-Range |
| Typical Application | Building Intercom, Key Copy | Corporate Access, Asset Tag | Guard Tour, Driver ID |
Why Source iButton Dallas Keys from SynTek?
Factory-direct 1-Wire touch memory key manufacturing with OEM customization capabilities
Multi-Chip Flexibility
Choose from RW1990 rewritable, DS1990A-F5, or TM1990A-F5 chips within the same product line. Switch between read-only and programmable Dallas keys based on your project requirements without changing suppliers.
Full OEM Customization
Custom handle colors, laser-engraved logos, pre-programmed UID sequences, and private-label packaging. MOQ from 500pcs for OEM orders. Your brand, manufactured to your specifications.
True Factory Source
Direct manufacturing eliminates trading company markups. From chip bonding to final assembly, we control the entire production process in our 3,600m² facility with complete quality traceability for every 1-Wire electronic key.
iButton Dallas Key Applications
Proven touch memory identification solutions across multiple industries
Building Access Control
Secure entry for offices, apartments, warehouses, and server rooms with contact-based authentication
Guard Tour Patrol
Security checkpoint verification for property management and patrol route confirmation
Time Attendance System
Employee clock-in/out verification with durable, non-transferable identification
Our Certifications
FAQ
Q: What is the difference between RW1990 and DS1990A-F5 iButtons?
A: The RW1990 is a rewritable touch memory key that allows you to program or clone the 64-bit identification code in the field. It's ideal for replacing lost intercom keys or creating duplicates. The DS1990A-F5 is a read-only iButton with a factory laser-etched serial number that cannot be modified, providing higher security for access control where unique identification is critical. Both use the same 1-Wire protocol and are physically interchangeable.
Q: Are your iButton Dallas keys compatible with existing 1-Wire readers?
A: Yes, all our touch memory keys (RW1990, DS1990A-F5, TM1990A-F5) are fully compatible with standard 1-Wire protocol readers and terminals. They work seamlessly with Dallas/Maxim iButton probes, Teltonika GPS driver ID readers, guard tour patrol devices, and most access control systems designed for iButton authentication.
Q: Can you provide custom OEM iButton keys with our company logo?
A: Absolutely. SynTek offers full OEM customization services including laser engraving your logo on the stainless steel button or handle, custom handle colors (beyond standard black/blue/red/green/yellow), private-label packaging, and pre-programmed UID sequences. OEM orders start from 500 pieces with 15-20 day lead time.
Q: What is the reading distance of iButton touch memory keys?
A: iButton Dallas keys use contact-based data transfer, which means the stainless steel button must physically touch the reader probe. This is intentional - the contact requirement eliminates wireless interference and ensures zero false reads, making it more reliable than RFID proximity technology in electrically noisy or harsh environments.
Q: Do you supply iButton readers and probes as well?
A: Yes. In addition to iButton tags and Dallas keys, we supply 1-Wire readers, USB adapters, and probe accessories to provide complete solutions. Our range includes standard contact probes, magnetic iButton readers for GPS tracking applications, and wall-mounted reader units for access control installations.
Q: What is the minimum order quantity for iButton Dallas keys?
A: Our standard MOQ is 100 pieces for stock items in standard colors. For OEM orders with custom branding, logo engraving, or special colors, the minimum is 500 pieces. We also offer sample orders (5-10 pieces) for evaluation purposes before bulk orders.
Q: How durable are iButton keys in harsh environments?
A: iButton Dallas keys are engineered for extreme durability. The 304 stainless steel enclosure is resistant to dust, moisture, shock, and chemicals. Operating temperature ranges from -40°C to +85°C. Keys are wear-tested for 10+ years of daily use. Unlike cards or fobs, they can be dropped, stepped on, or exposed to industrial atmospheres without damage.
Q: Can RW1990 keys be used to copy DS1990A-F5 keys?
A: Yes, RW1990 rewritable iButtons can be programmed to duplicate the 64-bit ID code from a DS1990A-F5 or TM1990A-F5 key. This makes them ideal for creating backup keys or replacing lost originals. You'll need an iButton programmer/writer device to perform the cloning operation.
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