# RFID card 125kHz TK4100

> 125kHz proximity RFID card with TK4100 chip, standard credit-card size, made of PVC, with read-only (non-rewritable) memory. Reading distance up to about 1 cm, compatible with most 125kHz RFID readers. Used for access control, time and attendance tracking, and identification. Basic security level, suited to applications with low security requirements.

- Page: https://sigmanortec.ro/en/rfid-card-125khz-tk4100
- Price: 1.96 RON
- Availability: In stock; 1-2 zile
- Reference: 33443 · EAN: 5940102812765
- Category: Electronic components > Access Control > RFID Cards and Tags
- Package (shipping data): 0.006 kg
- Updated: 2026-10-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 01:32 (Europe/Bucharest)

## Description

125kHz proximity card with TK4100 chip, ideal for access control and time and attendance, quickly transmits ID to compatible readers upon proximity. Standard credit card format PVC, thin and durable, with read-only memory for stable identification, works with most 125kHz RFID systems.
The 125kHz TK4100 RFID card is a type of access card that uses radio frequency identification (RFID) technology to enable wireless communication. The card has standard credit card dimensions, being thin and flat, with rounded edges. On the front, the card is white and sometimes has the serial number or a barcode printed. The back of the card is blank or may have a space for writing.
The card contains an internal chip and a built-in antenna, which are not visible but allow data transmission to an RFID reader when the card is brought close to it. TK4100 refers to the specific type of chip used, which operates at a frequency of 125kHz, suitable for access control and identification applications, such as opening secure doors or attendance recording.
THEY CANNOT BE WRITTEN WITH COPIERS!
Specifications:
Operating Frequency: 125kHz
Chip Type: TK4100
Storage Capacity: RO (Read-Only) memory without rewrite capability
Reading Distance: Generally up to 1 cm, but may vary depending on the reader
Dimensions: Standard credit card size (approximately 85.60 × 53.98 mm)
Material: PVC
Applications: Access control, time and attendance management, identification
Compatibility: Compatible with most 125kHz RFID readers
Security: Basic, more suitable for applications with low security requirements.