T5577 RFID Tag Key Fob for Access Control Systems
What Is a T5577 RFID Tag Key Fob?
A T5577 RFID tag key fob is a low-frequency RFID credential that operates at 125 kHz and stores identification data on a programmable EEPROM chip. Unlike fixed-code RFID credentials, the T5577 chip can be encoded and reconfigured using compatible RFID programming equipment.
Its combination of rewritable memory and support for multiple LF RFID formats makes it a widely used credential for systems that require configurable user identification.
Key Features for RFID Tag Key Fob
- Rewritable EEPROM memory
- Supports ASK, FSK, and PSK modulation
- Compact key fob format for everyday carrying
- ABS plastic housing
- Available in multiple colors
- Supports UID programming and serialization
- Suitable for custom branding and OEM projects
RFID Tag Key Fob Technical Specifications
| Parameter | Specification |
| Product Type | RFID Tag Key Fob |
| Chip | T5577 |
| Frequency | 125 kHz |
| Memory | 330-bit EEPROM |
| Read/Write Capability | Rewritable |
| Modulation | ASK, FSK, PSK |
| Protocol Compatibility | ISO 11784 / ISO 11785 Compatible |
| Reading Distance | 2–10 cm (Reader Dependent) |
| Material | ABS Plastic |
| Operating Temperature | -25°C to +70°C |
| Data Retention | Up to 10 Years |
| Available Colors | Blue, Black, Red, Yellow, Custom |
| Printing Options | Silk Screen, UV Printing, Laser Marking |
| Encoding Services | UID Programming Available |
| Numbering Options | Serial Number, Laser ID |
| Packaging | Standard or Custom Packaging |
| OEM / ODM Support | Available |
How Does a T5577 RFID Key Fob Work?
A T5577 RFID key fob contains a low-frequency RFID chip connected to an embedded antenna. When positioned within the electromagnetic field of a compatible RFID reader, the chip receives power and transmits stored identification data back to the reader.
Because the chip uses EEPROM memory, stored data can be modified using compatible RFID writers. This allows administrators and system integrators to configure credentials according to system requirements.
T5577 vs EM4100 RFID Key Tags
T5577 and EM4100 are both used in 125 kHz RFID systems, but they differ in data management capabilities.
| Feature | T5577 | EM4100 |
| Frequency | 125 kHz | 125 kHz |
| Rewritable | Yes | No |
| Memory Type | EEPROM | Factory Programmed |
| User Configuration | Supported | Not Supported |
| Data Modification After Issuance | Yes | No |
| For applications that require credential updates or replacement, T5577 provides greater flexibility than fixed-code RFID tags. | ||
Applications
T5577 RFID key fobs are commonly used for:
- Access control systems
- Employee attendance tracking
- Residential community access
- Parking management
- Membership identification
- Visitor management
Real-World Deployment
A commercial office building using a legacy 125 kHz access control system required replacement credentials for employees after a large-scale staff onboarding project. T5577 RFID key fobs were selected because new user data could be encoded onto the credentials while maintaining compatibility with the existing reader infrastructure. This allowed the facility to expand its credential inventory without replacing installed hardware.
Frequently Asked Questions (FAQ)
What is a T5577 RFID key fob?
A T5577 RFID key fob is a rewritable 125 kHz RFID credential used for user identification and access management.
Can T5577 emulate EM4100?
Yes. T5577 chips can be configured to emulate several low-frequency RFID formats, including EM4100.
What frequency does T5577 use?
T5577 operates at 125 kHz, which is part of the low-frequency RFID spectrum.
What memory type does the T5577 chip use?
The chip uses EEPROM memory, allowing data to be rewritten multiple times.
What is the typical read range?
Reading distance typically ranges from 2 to 10 cm depending on the reader, antenna design, and installation environment.
Can the key fob be customized?
Yes. Custom colors, logo printing, UID encoding, serial numbering, and packaging options are available.
Request a Quote or Sample
Need customized T5577 RFID key fobs for your access control project?
Contact our team to discuss chip encoding, branding requirements, sample availability, and volume pricing for OEM or bulk orders.
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