JLTRFID - Standard 125 kHz EM4100 Cards with Factory Customization Support
The EM4100 card is a 125 kHz read-only RFID card specifically designed for basic access control and identification applications. This RFID card has a fixed unique identifier that can be recognized by your system to grant door access, track employee attendance, manage parking, control hotel access, and support membership management.
When you purchase JLTRFID EM4100 RFID cards, you can choose from factory-supported standard cards, custom-printed cards, and bulk project orders, helping you avoid incorrect card selection, unclear pricing, and slow order processing.
JLTRFID is a professional RFID manufacturer with stable production capacity, strict quality inspection, fast delivery, and extensive export experience. If you need low-frequency RFID cards, access control cards, or read-only RFID cards, please send us your requirements for a factory quotation.
OEM / Customization Options
With JLTRFID, EM4100 RFID cards can be customized to match your branding and project requirements.
You can choose blank cards for simple applications or custom-printed cards for branded access control systems.
Logos, brand colors, card numbers, QR codes, barcodes, and printed UID numbers can all be added to the RFID card. You can also choose a glossy, matte, or frosted finish depending on how the card will be used.
Because the EM4100 chip is read-only and has a fixed, unchangeable UID, customization is available for the card surface, printing, and packaging to meet your specific needs.
For bulk orders, please contact JLTRFID with your artwork, sample card, or project requirements.
Why Buy EM4100 Cards Directly From JLTRFID
JLTRFID is an RFID card manufacturer with years of experience producing access control, ID, hotel, parking, and membership cards. You can buy directly from the factory.
Each order is checked for material quality, printing, chip performance, and overall quality before shipment. This helps ensure consistent card size, surface finish, and reading performance.
For international buyers, JLTRFID offers fast delivery, export packaging, and worldwide shipping. Please send us your order quantity, card design, reader specifications, and packaging requirements.
EM4100 Card Applications
JLTRFID EM4100 cards allow you to get access, identification, and entry control done by using one easy 125kHz RFID card.
Use EM4100 cards in simple door access control for offices, apartments, factories, and warehouses.
JLTRFID EM4100 card can be used in low security hotel room access or staff access control areas. It allows the hotels to purchase simple RFID cards for guests or employees.
Each card can be used as an employee ID in a check-in and check-out system. The fixed UID allows your system to track daily attendance of employees.
EM4100 helps manage vehicle access to parking lots, gated areas, and residential communities. It can be used for short distance reading from the card reader.
EM4100 cards can be used for gyms, clubs, libraries, and loyalty programs. Each member gets a simple RFID card for account check.
Technical Specifications
Use the specifications below to confirm whether an EM4100 RFID card is compatible with your 125 kHz RFID reader system.
- Chip & RFID Specifications
| Specification | Details |
| Chip Type | EM4100 / EM4100-compatible |
| Frequency | 125 kHz
|
| RFID Type
| Low-frequency RFID
|
| Memory | 64-bit UID |
| UID State | Fixed UID, factory-programmed |
| Write Function | Not writable |
| Powering | Passive, battery-free |
| Read Range | Depends on reader configuration; typically 2-10 cm |
| Security | UID read-only, no encryption |
Card Body Specifications
| Specification | Details |
| Standard Size | CR80, 85.5 × 54 mm
|
| Typical Thickness | 0.8-1.8 mm, depending on card type |
| Materials | PVC / PET |
| Surface Treatment
| Glossy, matte, or frosted
|
| Operating Temperature | -40°C to +85°C |
| Reading Method | Close-range tap reading |
| Available Formats | Flat card and clamshell card |
Before mass production, please provide your reader model or sample cards to JLTRFID for verification.
EM4100 vs TK4100 vs EM4200
Choosing between EM4100, TK4100, and EM4200 can affect RFID card reader compatibility, pricing, and availability. Although these cards may appear similar, it is important to confirm the chip type before placing an order.
| Card Type | Frequency | Writable | Suitable For | Key Point |
| EM4100 | 125 kHz | No | Simple access control, ID cards, attendance systems | Read-only 125 kHz RFID card with a fixed, unchangeable UID |
| TK4100 | 125 kHz | No | Low-cost access control and replacement cards | Common EM4100-compatible card widely used for budget projects |
| EM4200 | 125 kHz | Usually no, depending on the version | Projects requiring better performance than basic EM4100 cards
| Used when customers need an upgraded alternative to standard 125 kHz RFID cards |
If you are using EM4100 or TK4100 RFID cards, please provide your reader model or a sample card. We will help you identify the most suitable 125 kHz RFID card for your project, helping you avoid delays caused by ordering the wrong card type.
EM4100 RFID cards are recommended for simple access control systems. They are not suitable for high-security applications because they are read-only cards and do not support encryption.
EM4100 cards can be used for access control, ID verification, staff attendance tracking, parking, hotel entry, and member programs. The EM4100 card should be considered if you want to implement a system where just the card ID needs to be read.
No. EM4100 cards are read-only. The card ID is pre-programmed during manufacturing of the chip and cannot be modified or rewritten.
Both EM4100 and TK4100 are 125 kHz read-only RFID cards. The TK4100 card is usually used as a cheap alternative compatible with EM4100 cards.
Yes. EM4100 is a 125 kHz low-frequency RFID card. These types of cards are commonly used for access control, attendance, and ID systems.
Yes. The card ID can be cloned on a compatible programmable 125 kHz card. EM4100 card is good for basic access control usage and should not be used for high-security projects.
EM4100 cards are powered by the RFID reader, which means that the card does not require any additional power source.
As soon as the card is placed in proximity to the reader, it receives energy from the reader and sends its unique ID back to the reader.
Popular EM cards include EM4100, EM4102, EM4200, EM4305, and EM4450. There are both read-only and read/write types of these cards.
EM4100 cards are cheap, easy-to-use, durable, and popular cards. However, the cards are read-only, without any encryption, and are not recommended for high-security projects.
You can test the card using a 125 kHz EM reader or send it to JLTRFID for tests. If the card has read-only ID and is not rewritable, it can be either EM4100 or compatible EM card.
The most common alternatives to EM4100 cards are MIFARE Classic, MIFARE Plus, MIFARE DESFire, NTAG, ICODE, and UHF RFID cards.
