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)

Related Products You May Like

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.

Made with care

Great value

Elegant design

Quality materials

This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.

We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.