50PCS ID 125KHz RFID Key Tag Writable Rewritable T5577 Fob Black

Description

Product Overview

Introducing the dcvbny 50PCS ID 125KHz RFID Key Tag set, a high‑performance solution designed for businesses that require flexible, reliable, and cost‑effective access control components.

These 50PCS ID 125KHz RFID Key Tag set delivers a versatile solution for modern access control environments. Each tag incorporates an ATMEL T5577 chip that operates at the standard 125 kHz frequency, ensuring compatibility with a wide range of commercial door readers and RFID writers. Constructed from durable black plastic, the rectangular form factor provides a comfortable fit for keychains, badge holders, or lock cylinders. Because the chips are completely blank, they can be programmed, erased, and reprogrammed up to one hundred thousand times, giving administrators the freedom to create temporary credentials, backup copies, or custom access profiles without the need for additional inventory. The tags are designed for reliable performance in both indoor and outdoor installations, resisting wear, moisture, and temperature fluctuations typical of industrial settings.
The 125 kHz T5577 chip is a universal platform that can emulate a variety of legacy 125 kHz tags, making it a flexible choice for retrofitting older lock systems. Unlike NFC-enabled chips, this model does not interact with smartphones, which eliminates accidental reads and enhances security for environments where only dedicated RFID writers are authorized. The blank state of each tag means there is no pre‑loaded data, protecting your organization from unintended exposure of proprietary access codes. Programming is performed with any standard 125 kHz RFID writer or copier, allowing quick batch updates and seamless integration into existing key management workflows.
Each tag measures 5.35 × 4.69 × 1.38 inches and weighs approximately 7 ounces, providing a compact yet sturdy form factor that can be easily attached to keyrings or badge holders. The rectangular plastic shell is engineered to protect the internal chip from physical shocks and environmental contaminants, while the smooth black finish offers a professional appearance suitable for corporate branding. The tags are supplied in a bulk pack of 50 units, allowing organizations to stock sufficient inventory for large‑scale deployments without the need for frequent reordering.
The T5577 chip complies with ISO 11784/11785 standards for 125 kHz RFID, ensuring interoperability with a wide range of commercial access control systems and legacy devices. Because the tags are unencrypted and operate on a fixed frequency, they can be integrated into existing infrastructure without firmware upgrades or additional licensing fees. This makes them an economical choice for businesses seeking to modernize their security protocols while preserving investment in current hardware.
Programming the blank tags is straightforward: place the tag on the writer’s antenna, select the desired data format, and transmit the code. The writer’s software confirms successful write operations, and the tag can be immediately tested by bringing it within the reader’s range. This rapid cycle enables administrators to generate large batches of credentials in minutes, streamlining deployment for new facilities or system upgrades.
From a security perspective, the ability to erase and rewrite tag data eliminates the risk of stale credentials lingering in the system. When an employee leaves the organization, the associated tag can be instantly cleared and reassigned, preventing unauthorized reuse. This dynamic credential management aligns with best practices for access control hygiene and supports compliance with industry regulations such as ISO 27001.

Usage

These tags are ideally suited for hotel key card programs, where staff can quickly encode room numbers onto a blank tag and deactivate it at checkout, reducing waste and cost. In corporate campuses, security teams can issue temporary visitor badges that expire after a predetermined period, simply reprogramming the same physical tag for each new guest. Warehouse managers benefit from the ability to label equipment, pallets, or toolkits with RFID tags that can be updated as assets move between locations, ensuring accurate inventory tracking without the need for multiple tag types. Because the reading distance ranges from 2.5 to 10 cm, the tags work reliably with standard proximity readers placed on doors or turnstiles.
In educational institutions, administrators can assign RFID tags to laboratory equipment, allowing students to check out tools with a simple tap and return them at the end of the session. The rewritable nature eliminates the need to purchase disposable tags for each semester, and the blank chip ensures that no previous user data remains on the tag. Similarly, event organizers can distribute access tags for conference rooms, backstage areas, or VIP lounges, updating permissions in real time as schedules change. The compact size of the tags makes them easy to attach to lanyards, badge clips, or directly onto metal key loops.
Security‑focused facilities such as data centers or research labs often require strict access control, and the ability to quickly revoke or modify credentials is essential. By programming these blank tags with unique identifiers, administrators can enforce time‑based access, limit entry to specific zones, and audit entry events through the RFID reader’s log. Because the tags are not NFC‑compatible, they cannot be intercepted by consumer smartphones, adding an extra layer of protection against unauthorized cloning. The robust plastic housing also tolerates frequent handling, making the tags suitable for high‑traffic door points where durability is paramount.
In healthcare facilities, the tags can be employed to control access to medication storage cabinets, operating rooms, and patient record areas. By assigning unique identifiers to staff members and updating them as roles change, hospitals can maintain strict audit trails and quickly deactivate access for departing personnel, enhancing patient safety and regulatory compliance.
Logistics companies benefit from tagging pallets and containers with these rewritable RFID tags, allowing real‑time location updates as shipments move through distribution centers. The ability to overwrite tag data eliminates the need for disposable tags on each leg of a journey, reducing waste and simplifying the process of consolidating inventory information across multiple carriers.
Universities can integrate the tags into campus card systems, allowing students to access libraries, labs, and dormitories with a single programmable credential. The ability to rewrite tags each semester reduces costs and simplifies the transition between academic years, while the robust construction withstands the high‑volume usage typical of campus environments.
Automotive service centers can leverage the tags to program transponder keys for vehicles equipped with 125 kHz immobilizer systems. The blank tags allow technicians to clone a lost key by copying the original code onto a new tag, then reprogram the tag for a different vehicle after erasing the previous data, streamlining the key replacement workflow.

Why Choose Us

Our company, dcvbny, adheres to strict quality control standards throughout the manufacturing process of each RFID tag. The blank T5577 chips are sourced from reputable semiconductor suppliers, and each batch undergoes functional testing to verify write‑erase cycles, frequency accuracy, and signal strength. This rigorous approach guarantees that every tag meets the advertised 100,000 rewrite capability and maintains a consistent read range of 2.5 to 10 cm. Customers can rely on the consistency of performance, reducing the risk of tag failures that could compromise security or cause operational delays. Our dedicated support team is available to assist with programming guidance, troubleshooting, and bulk order coordination, ensuring a smooth integration into your existing security infrastructure.
Beyond the core product, dcvbny offers comprehensive documentation and firmware updates for compatible RFID writers, helping users maximize the potential of the blank tags. Our online knowledge base includes step‑by‑step tutorials, sample data files, and best‑practice recommendations for various applications such as hotel key management, employee access badges, and asset tracking. By staying current with industry standards and emerging security protocols, we ensure that the tags remain compatible with future reader models, protecting your investment over the long term. Our commitment to sustainability also means the tags are RoHS compliant and packaged using recyclable materials, aligning with environmentally responsible procurement policies.
Reliability is reinforced by a ten‑year data storage guarantee, meaning the information programmed onto each tag will remain intact for a decade under normal operating conditions. This longevity is particularly valuable for long‑term installations such as building access points, where replacing tags frequently would be costly and disruptive. The tags also feature a robust plastic casing that resists impact, UV exposure, and chemicals commonly encountered in industrial environments. As a result, you can deploy the tags in harsh settings without concern for premature degradation, ensuring consistent performance throughout their service life. The consistent read performance also simplifies maintenance schedules, as technicians can quickly verify tag functionality with a handheld reader during routine inspections.
Customer satisfaction is further supported by our responsive after‑sales service, which includes a 30‑day return policy for defective units and a one‑year warranty covering manufacturing defects. Should you encounter any programming challenges, our technical support team can provide remote assistance, detailed configuration files, and, if necessary, replacement tags shipped at no additional cost. This level of service reduces downtime and protects your operational continuity, making the dcvbny RFID tags a dependable component of any access control strategy. We pride ourselves on building long‑term relationships with clients who value reliability, flexibility, and responsive support. Our global distribution network ensures fast shipping to major regions, minimizing lead times and keeping your projects on schedule.
Our research and development team continuously evaluates emerging RFID technologies to ensure that our product line remains at the forefront of performance and security. By incorporating feedback from field deployments, we refine chip programming algorithms and improve antenna designs, delivering tags that exhibit faster response times and higher read reliability across diverse reader models.
Sustainability is a core value for dcvbny; all tags are RoHS compliant and packaged in recyclable cardboard, reducing environmental impact. We also hold ISO 9001 certification for quality management, providing assurance that each production batch undergoes systematic inspection and traceability, reinforcing confidence in the consistency of every tag delivered.
Our international support centers operate in multiple time zones, providing prompt assistance to customers across North America, Europe, and Asia‑Pacific. Whether you need help with initial setup, bulk programming scripts, or troubleshooting unexpected read errors, our engineers are equipped to deliver solutions that keep your access control system running smoothly.
We also provide on‑site training sessions and webinars that cover best practices for RFID tag management, data security, and system integration. Participants receive hands‑on experience with our programming tools, ensuring they can confidently deploy and maintain the tags in their specific operational context.

Key Features

• Fully blank T5577 chip allows up to 100,000 write/erase cycles, giving you endless flexibility to create, update, or replace access credentials as needed.
• Operates at 125 kHz frequency with a reliable read range of 2.5–10 cm, ensuring consistent performance with standard commercial access control readers.
• Durable black plastic housing resists wear, UV exposure, and chemicals, making the tags suitable for harsh industrial, outdoor, and high‑traffic environments.
• Compatible with any 125 kHz RFID writer/copier, enabling quick batch programming and seamless integration into existing key management systems without additional hardware.
• Includes 30‑day return policy and one‑year warranty, plus dedicated technical support to assist with programming, troubleshooting, and bulk order coordination.

FAQ

Can these tags be used with NFC-enabled smartphones?

No, the T5577 chip operates at 125 kHz and is not NFC compatible, so smartphones cannot read or write the tags.

What is the maximum read distance for these tags?

The tags provide a sensing distance of approximately 2.5 to 10 cm (1 to 4 inches) when used with a standard 125 kHz RFID reader.

How many times can the tag be rewritten?

Each tag supports up to 100,000 write/erase cycles, allowing extensive reuse for temporary or permanent access credentials.

Are the tags compatible with Proxmark3 or other advanced RFID tools?

These tags are designed for use with 125 kHz RFID writers/copiers only and will not function with Proxmark3, RDV4, or similar devices.

Choose dcvbny for reliable, adaptable RFID solutions that grow with your security needs.