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The difference between FDX tags and HDX tags

FDX (Full Duplex) and HDX (Half Duplex) are two technologies commonly used for RFID (Radio Frequency Identification) applications in animal identification and management systems. They are different in terms of their communication methods and operating frequencies, and are often used for different purposes.

RFID glass tag.jpg

FDX Technology: FDX technology is a full-duplex communication method, meaning that it allows for simultaneous communication in both directions. This means that the reader and the tag can communicate with each other at the same time, which can lead to faster and more reliable data transfer. FDX tags use a low frequency of 134.2 kHz, which provides better penetration and readability in dense environments, such as animal herds. FDX tags are often used for animal identification and tracking, as well as for access control, asset tracking, and other applications.

FDX (Full Duplex): FDX tags operate at a single high-frequency band, typically 134.2 kHz. This frequency is commonly used for animal tracking and identification, such as in livestock management.

FDX-A protocol frequency is 125 KHz generally used in industry.

FDX-B protocol frequency is 134.2 KHz is an animal standard protocol. HDX is half duplex (Half Duplex): data transmission allows data to be transmitted in two directions, but at a certain time, only data is allowed to be transmitted in one direction.

Communication Method: Full Duplex allows simultaneous two-way communication where both devices can transmit and receive data at the same time.

Frequency: FDX-A protocol typically operates at 125 KHz, commonly used in industrial applications.

FDX-B Protocol: Operates at 134.2 KHz and is a standard protocol for animal tracking.

Data Structure: FDX tags have a data structure of 128 bits, providing more writable content.

Transmission Rate: FDX has a lower transmission rate compared to HDX.

Frequency Conversion: FDX tags do not use frequency conversion technology.

RFID Animal tag

RFID Glass Tag

RFID Ear tag

RFID tag for cattle

PIT tag

HDX RFID Tag Technology

How HDX tag Works ?

HDX RFID operates on the principle of half-duplex communication, where data transmission occurs in two directions but not simultaneously. HDX readers generate short magnetic pulses that wirelessly charge a capacitor inside the HDX tag. When the charge field turns off, the tag utilizes the stored power to transmit its unique identification number back to the reader.

HDX tag Advantages and Applications

The capacitor in an HDX tag limits its size, with the smallest HDX tags measuring 12.0 mm x 2.15 mm. However, HDX tags offer advantages such as better noise immunity and the ability to use larger, simpler antennas. These antennas are typically uncomplicated loops of insulated wire that can be submerged in water without requiring an air gap or frame.

HDX tag Technical Specifications

HDX tags use Frequency Shift Keying (FM) for data transmission, with the ability to cross substantial water bodies, such as 190 feet (60 meters) streams. HDX readers require less power due to their pulsed charge field, allowing a scan rate of up to 14 per second.

HDX 32*4mm PIT Tag

HDX 15*3mm PIT Tag

HDX 8*2.12mm PIT Tag

HDX 7*1.25mm PIT Tag

HDX12 PIT Tag manufacturer

FDX vs. HDX: In-Depth Comparison

When comparing FDX and HDX RFID technologies, several key factors come into play, including communication methods, frequencies, data structures, and application scenarios. In this section, we will delve deeper into their differences and considerations for making informed choices.

Communication Methods

FDX: FDX tags allow simultaneous data transmission and reception, achieving full-duplex communication. They use Amplitude Shift Keying (AM) for data transmission, known for its reliable and efficient communication.

HDX: HDX tags employ half-duplex communication, enabling data transmission in two directions but not simultaneously. They typically use Frequency Shift Keying (FM) for data transmission, offering relatively slower communication.


FDX: FDX tags generally operate at higher frequencies (typically around 134.2 kHz) and are suitable for applications like animal tracking and identification.

HDX: HDX tags typically operate at lower frequencies (around 125 kHz) and find use in access control and asset tracking applications.

Application Scenarios

FDX: FDX tags are commonly used for animal identification and tracking, including livestock management, pet identification, and wildlife tracking. Their full-duplex communication suits real-time tracking and monitoring.

HDX: HDX tags are widely employed in access control systems, inventory management, and asset tracking, particularly in scenarios where longer read ranges are required, and slower data transmission is acceptable.

Read Range

FDX tags generally have a shorter read range compared to HDX tags due to their higher operating frequency, requiring the reader to be closer to the tag for successful communication.

HDX tags tend to have a longer read range, making them suitable for applications where reading tags from a distance is essential.

FDX Tag  HDX Tag Application Cases

To illustrate the practicality of FDX and HDX tags, here are some real-world application examples:

Livestock Management: FDX RFID ear tags are widely used for identifying and tracking cattle, sheep, and other livestock, enabling farmers to monitor animal locations and health in real-time.

Pet Identification: FDX tags are embedded in pets for tracking lost animals and helping pet owners reunite with their beloved companions.

Wildlife Tracking: Wildlife researchers employ FDX tags to monitor animal migrations and behaviors, aiding in the conservation of endangered species.

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