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5-Pack 125KHz T5577 Rewritable RFID Coin Cards & Keyfobs
5-Pack 125KHz T5577 Rewritable RFID Coin Cards & Keyfobs
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5-Pack 125KHz T5577 Rewritable RFID Coin Cards & Keyfobs
Upgrade your access control setup with this handy 5-piece set of ultra-thin 125KHz T5577 RFID coin cards and keyfobs. Engineered with a copper coil and a blank T5577 chip, these cards can be written and rewritten over 10,000 times — making them ideal for offices, hotels, schools, gyms, and anywhere that uses 125KHz proximity access systems.
At just 0.3mm thin and 38mm in diameter, they slip easily into a wallet, stick to the back of a phone case, or attach to a keyring. No battery required — the card draws power inductively from the reader for instant, contactless access.
⚠️ Important Note: The chip ships blank. You must write data to it using a compatible 125KHz RFID reader/writer before it can be read by an access system.
Key Features
- Chip Model: T5577 — fully rewritable, multi-protocol
- Working Frequency: 125 KHz
- Read/Write Cycles: 10,000+
- Read/Write Speed: 1 ms
- Detection Distance: 0–8 cm
- Material: Durable PVC with copper coil
- Dimensions: 38mm diameter, 0.3mm thickness (ultra-thin)
- Power: Passive — no external power required
- Durability: Waterproof, moisture-proof, vibration-proof, anti-corrosion, high-temperature resistant
- Safety: Non-toxic and environmentally friendly
Wide Range of Applications
- Door & gate access control systems
- Hotel room locks
- Employee & staff attendance tracking
- School and campus entry management
- Membership management systems
- Parking lot entry and payment
- Transportation and municipal services
- Security and identification systems
Specifications at a Glance
| Feature | Detail |
|---|---|
| Chip | T5577 |
| Frequency | 125 KHz |
| Read/Write Cycles | >10,000 |
| Read/Write Time | 1 ms |
| Read Distance | 0–8 cm |
| Material | PVC + Copper Coil |
| Diameter | 38 mm |
| Thickness | 0.3 mm |
| Quantity | 5 pcs |
Made in Mainland China.
Package Contents
5 × 125KHz T5577 RFID Coin Card / Keyfob (blank)
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- 0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits
For more information on RFID technology standards and security, visit the National Institute of Standards and Technology (NIST) Cybersecurity Resources.
Frequently Asked Questions
Q: Are these 125KHz T5577 RFID cards compatible with my existing access control system?
A: These cards operate at 125KHz and use the T5577 chip, which supports multiple protocols including EM4100, HID, and others. They are compatible with most standard 125KHz proximity access systems. Always confirm your reader supports 125KHz T5577-format cards before purchasing.
Q: Why can't my reader detect the card right out of the package?
A: The T5577 chips ship completely blank — they contain no pre-written data. You must first use a compatible 125KHz RFID reader/writer device to write data (such as an ID code) to the card. Once programmed, it will work with any compatible 125KHz reader.
Q: How many times can I rewrite these RFID cards?
A: The T5577 chip supports more than 10,000 read/write cycles, making these cards highly durable and reusable for long-term access management needs.
Q: Can I stick this ultra-thin card to the back of my phone?
A: Yes! At just 0.3mm thick and 38mm in diameter, the coin card is designed to be slim enough to fit between a phone and its case for convenient tap-to-access use.
