RFID Chip Inside

RFID technology is widely used in logistics, warehousing, retail, manufacturing, healthcare, asset management, and supply chain operations. Although RFID tags are often small and simple in appearance, the RFID chip inside each tag performs the essential functions that make automatic identification possible.

The RFID chip stores identification data, processes commands received from an RFID reader, and controls communication between the tag and the reader. Together with the tag antenna, it allows products and assets to be identified without direct contact or line-of-sight scanning.

In this article, we explain what an RFID chip is, how it works, what information it can store, and how to select the right chip for different RFID applications.

1.What Is an RFID Chip Inside a Tag?

An RFID chip is a small integrated circuit embedded within an RFID tag, label, card, key fob, wristband, or industrial transponder. It is connected to an RFID antenna, forming the core structure of the RFID tag.

A typical RFID tag consists of:

• RFID chip: Stores and processes identification information.
• RFID antenna: Receives and transmits radio-frequency signals.
• Substrate: Supports the chip and antenna structure.
• Protective material: Protects the RFID inlay from moisture, dust, impact, chemicals, or high temperatures.

The RFID chip inside the tag may be almost invisible to the user, but it determines many important tag specifications, including operating frequency, memory capacity, reading performance, security features, and supported communication protocols.

2.How Does an RFID Chip Work?

An RFID system normally includes an RFID tag, an RFID reader, a reader antenna, and supporting software.

When the reader transmits a radio-frequency signal, the tag antenna receives the signal and sends it to the RFID chip. The chip processes the reader’s command and returns its stored identification data through the antenna.

The basic process includes four steps:

1. The RFID reader generates a radio-frequency field.
2. The tag antenna receives the signal.
3. The RFID chip processes the command and accesses the requested data.
4. The tag sends the information back to the reader.

This process can happen within milliseconds. Depending on the RFID frequency, antenna design, reader power, installation environment, and tag type, multiple tags can be identified during a single reading operation.

3.How Does a Passive RFID Chip Get Power?

A passive RFID tag does not contain a battery. Instead, the RFID chip inside receives energy from the electromagnetic field generated by the RFID reader.

The antenna collects energy from the reader’s signal and transfers it to the chip. Once sufficient energy is available, the chip activates, processes the reader command, and transmits its stored data.

Because passive RFID tags do not require batteries, they can offer several advantages:

• Compact tag construction
• Lower production cost
• Long operating life
• Minimal maintenance requirements
• Suitability for large-scale deployment

Passive RFID chips are commonly used in product labels, clothing tags, warehouse labels, logistics tracking tags, access cards, library labels, and asset identification tags.

4.What Information Is Stored in an RFID Chip?

The available memory depends on the chip model and RFID frequency. Common RFID memory areas include:

EPC Memory

EPC memory stores the Electronic Product Code or another unique identification number. It is commonly used in UHF RFID applications such as retail inventory, logistics, warehouse management, and supply chain tracking.

TID Memory

TID stands for Tag Identifier. This memory area generally contains chip-related identification information programmed by the chip manufacturer. Depending on the chip, some or all of this information may be permanently locked.

User Memory

User memory is an optional storage area for application-specific information. It can be used for batch numbers, product data, inspection records, maintenance information, or internal asset codes.

Not every RFID chip includes user memory, and the available capacity varies between different chip models.

Reserved Memory

In many UHF RFID chips, reserved memory is used for access and kill passwords. These functions can help control tag access or permanently deactivate the tag when required.

Types of RFID Chips

RFID chips can be divided into several categories according to their operating frequency.

Low-Frequency RFID Chips

Low-frequency RFID generally operates around 125 kHz or 134.2 kHz. LF RFID is commonly used for animal identification, access control, vehicle immobilizers, and short-range identification.

LF systems typically offer shorter reading distances but can perform reliably near water and certain challenging materials.

High-Frequency RFID Chips

High-frequency RFID operates at 13.56 MHz. HF RFID and NFC chips are commonly used in access cards, library systems, smart posters, payment applications, product authentication, and mobile-phone interactions.

Common standards include ISO/IEC 14443 and ISO/IEC 15693.

Ultra-High-Frequency RFID Chips

UHF RFID commonly operates within the 860–960 MHz range, depending on regional regulations. UHF chips are widely used for warehouse inventory, apparel tracking, pallet identification, logistics, manufacturing, and asset management.

UHF RFID supports longer reading distances and fast identification of multiple tags, making it suitable for high-volume supply chain applications.

5.What Determines RFID Chip Performance?

The RFID chip is important, but overall tag performance also depends on how the chip works with other system components.

Important factors include:

• Chip sensitivity
• RFID antenna design
• Tag size and construction
• Reader output power
• Reader antenna gain
• Operating frequency
• Attachment material
• Tag orientation
• Metal or liquid interference
• Environmental conditions

For example, placing a standard RFID label directly on metal can significantly reduce its performance. In this situation, a specially designed on-metal RFID tag is normally required.

Therefore, selecting a high-performance RFID chip alone does not guarantee the best reading result. The chip, antenna, tag structure, reader, and application environment must be evaluated as a complete system.

Applications of RFID Chips

The RFID chip inside a tag can support a wide range of automatic identification applications.

Warehouse and Logistics

RFID tags can be attached to cartons, pallets, containers, and individual products. RFID readers can automatically collect tag data during receiving, storage, picking, and shipping operations.

Retail and Apparel

RFID chips help retailers perform faster inventory counts, locate products, reduce stock discrepancies, and improve item-level visibility.

Manufacturing

RFID tags can identify raw materials, work-in-progress items, tools, molds, components, and finished products throughout the production process.

Asset Tracking

Companies can use RFID tags to manage computers, equipment, tools, vehicles, and other valuable assets. Each tagged asset can be linked to its location, status, maintenance history, or responsible department.

Healthcare

RFID technology can support the identification of medical equipment, supplies, samples, uniforms, and other healthcare assets.

Laundry Management

Washable RFID tags can be integrated into garments and textiles to support automated sorting, washing-cycle tracking, and inventory control.

6.How to Select the Right RFID Chip

Before selecting an RFID chip, businesses should define the actual application requirements.

Important questions include:

• What reading distance is required?
• Will the tag be attached to metal, plastic, glass, paper, fabric, or another material?
• How much EPC or user memory is needed?
• Does the information need to be rewritten?
• Are password protection or security features required?
• Will multiple tags be read simultaneously?
• What temperature, moisture, chemical, or mechanical conditions will the tag face?
• Which RFID frequency and protocol are supported by the reader?

Testing the selected RFID tag in the real application environment is strongly recommended before mass production. Actual performance can vary according to the installation method, reader configuration, surrounding materials, and electromagnetic environment.

7.Conclusion

The RFID chip inside a tag is the central component responsible for storing data, processing reader commands, and enabling wireless identification. However, reliable RFID performance depends on more than the chip alone. Antenna design, tag construction, reader settings, attachment materials, and the application environment all play important roles.

By selecting the correct RFID chip and matching it with a suitable antenna and tag structure, businesses can build more efficient identification, inventory, tracking, and asset-management systems.

As an RFID hardware manufacturer and supplier, SEIKO RFID TECHNOLOGY LTD. provides RFID inlays, labels, industrial tags, reader antennas, fixed readers, handheld readers, and customized RFID hardware for different applications. Chip type, memory, dimensions, printing, materials, and tag structure can be selected according to project requirements.