Product Overview
The 125kHz PVC RFID Proximity Card is a low-frequency passive identification card widely used for access control, attendance tracking, and identity verification. Operating at 125kHz with a typical read range of 2–10 cm, it provides reliable short-range identification that prevents accidental or unauthorized long-range scanning — a natural security advantage for door entry systems.
Multiple chip options are available to suit different needs. Read-only chips (TK4100, EM4200) offer a factory-programmed unique ID that cannot be modified — ideal for standard access control where security is managed at the software level. Read-write chips (T5577, EM4305) provide reprogrammable memory with password protection for applications requiring custom data encoding.
Made of standard CR80-sized PVC (85.5 × 54 mm) with 0.84mm thickness, the card has a smooth surface compatible with offset and silk-screen printing. Optional glossy, matte, or frosted lamination finishes are available. Holes can be punched (round, square, or metal eyelet) for lanyard attachment. Passive design requires no battery and operates reliably from -25°C to +70°C.
Key Features
Short-Range Identification
125kHz LF passive technology. 2–10 cm read distance. No battery needed. Prevents accidental long-range scanning for secure entry.
Multiple Chip Options
Read-only (TK4100/EM4200) for simple access. Read-write (T5577/EM4305) for programmable data. Match your existing reader format.
Printable PVC Surface
Smooth surface for offset and silk-screen printing. Add barcode, QR code, or serial number. Optional lanyard hole for wearable use.
EM4100 Protocol Compatible
Works with standard 125kHz readers and Wiegand 26/34 output worldwide. Drop-in replacement for most existing access control systems.
Durable & Waterproof
PVC construction rated for 100K+ flex cycles. Waterproof and anti-static. Reliable from -25°C to +70°C in indoor and outdoor use.
Cost-Effective Access Control
The most affordable RFID card type for door entry and attendance. Low per-unit cost with bulk orders. Free samples available before purchase.
Product Specifications
| Parameter |
Specification |
| — RFID PARAMETERS — |
| Frequency |
125 kHz (Low Frequency) |
| Protocol |
ISO 11784/11785 |
| Available Chips |
TK4100 (Read-Only) · EM4200 (Read-Only) · T5577 (Read-Write) · EM4305 (Read-Write) |
| UID |
Factory-programmed, read-only (TK4100/EM4200); Programmable (T5577/EM4305) |
| Memory (TK4100) |
64-bit ROM (32-bit ID + 20-bit manufacturer code + parity) |
| Memory (EM4200) |
128-bit mask ROM (64-bit or 96-bit UID options) |
| Memory (T5577) |
330-bit EEPROM |
| Memory (EM4305) |
512-bit EEPROM (16 blocks × 32 bits) |
| Modulation |
ASK (Amplitude Shift Keying) |
| Data Encoding |
Manchester, Biphase, PSK, FSK (chip-dependent) |
| Anti-collision |
Not supported |
| Read Range |
2–10 cm (1–4 in) |
| Pre-encoding Options |
Serial numbers (read-write chips only) |
| Data Retention |
≥ 10 years |
| Write Endurance |
≥ 100,000 cycles (T5577/EM4305) |
| — PHYSICAL PARAMETERS — |
| Size |
CR80: 85.5 × 54 mm (3.375 × 2.125 in) |
| Thickness |
0.84 ± 0.04 mm (standard thin card) |
| Material |
PVC (standard) · PET (optional) |
| Surface Finish |
Glossy / Matte / Frosted |
| Hole Punching |
Top center round hole, side hole, square hole, metal eyelet (optional) |
| Printing Options |
Offset printing, silk-screen, UV color, digital printing |
| Lamination |
Glossy / Matte / Frosted overlay; thermal transfer printer compatible |
| Operating Temperature |
-25°C to +70°C |
| Storage Temperature |
-40°C to +85°C |
| Humidity |
20% – 90% RH |
| Durability |
Waterproof, dustproof, anti-static; ≥ 100,000 flex cycles |
| Weight |
Approx. 5.8 g |
| Packing |
200 pcs/box, 10 boxes/carton |
Applications
Access Control & Door Entry
The most common application for 125kHz proximity cards. Contactless entry for offices, residential complexes, and factories with Wiegand 26/34 readers.
Time & Attendance Tracking
Employees or students tap their card at a reader to record check-in and check-out times. Read-only chips prevent card cloning at the hardware level.
Parking Management
125kHz proximity cards are widely used in parking lot access systems. Card UID is transmitted to validate credentials and open the gate at entry points.
Employee ID & Corporate Badges
Combines visual identification with RFID access in a single card. Print employee photo and name; embed UID for door entry and time tracking.
School & Campus ID Cards
Used by students and staff for building access, library entry, and cafeteria payment. Low cost enables large-scale deployment across campuses.
Hotel Key Cards
T5577/EM4305 read-write chips enable room-specific data encoding and reprogramming for each guest check-in. Cost-effective for high-volume hotel operations.
Why Choose RFIDSU?
0+
Years in RFID Manufacturing
OEM
Full OEM/ODM Custom Service
Free
Samples & Technical Support
Shenzhen RFIDSU Technology Co., Ltd. is a professional RFID proximity card manufacturer with 10+ years of experience in low-frequency RFID product design and production. We supply 125kHz proximity cards, RFID keyfobs, wristbands, and labels to access control system integrators and OEM/ODM partners worldwide. Our cards are compatible with all standard EM4100 and Wiegand-based readers. Every order includes full customization — chip selection, printing, encoding, hole punching, and packaging — backed by free samples and technical support.
Customization Options
We offer full OEM/ODM service for 125kHz RFID proximity card orders. Tell us your requirements — we handle chip selection, printing, encoding, and packaging.
Chip Selection
Read-only chips (TK4100/EM4200) for standard access. Read-write chips (T5577/EM4305) for programmable data and password protection. Match your reader format.
Size
CR80 standard: 85.5 × 54 mm. Custom sizes available on request for non-standard applications.
Material
PVC (standard) or PET (optional). Standard 0.84mm thin card for printing and flexibility. Up to 2.0mm thick card available for rigid applications.
Hole Punching & Wearable
Top center round hole for lanyard attachment. Side hole, square hole, or metal eyelet (鸡眼孔) options. Pair with lanyard or badge holder for wearable use.
Printing
Full-color offset or silk-screen printing on both sides. Barcode, QR code, laser serial number, or magnetic stripe. Matte, glossy, or frosted finish available.
Pre-encoding & Packaging
Read-write chips (T5577/EM4305) support pre-encoding with your serial numbers or data format. Standard 200 pcs/box. Custom box printing and individual OPP bags available.
Frequently Asked Questions
What is the difference between TK4100 and T5577 chips?
TK4100 is a read-only chip with a factory-programmed 64-bit UID that cannot be modified. It is the most cost-effective option for standard access control. T5577 is a read-write chip with 330 bits of EEPROM memory and password protection. It can be programmed multiple times, making it suitable for systems where card IDs need to be managed or reassigned. If you are unsure which 125kHz RFID proximity card chip fits your system, contact us with your reader model and we will verify compatibility for free.
Can these 125kHz cards work with my existing access control system?
Most likely, yes. 125kHz proximity cards using the EM4100 protocol or Wiegand 26/34 output are compatible with the vast majority of access control systems worldwide. The most important thing is to confirm your reader's supported chip type and output format before ordering. Send us your reader model or a sample card and we will verify compatibility for free.
What is the typical read range of a 125kHz proximity card?
The read range typically falls between 2 cm and 10 cm, depending on the reader's antenna power and the card's antenna design. Unlike UHF RFID cards that can be read from several meters away, 125kHz proximity cards are designed for close-range, intentional presentation — which is a security advantage for access control, as it prevents accidental or remote reading.
Can I print on these cards myself after purchase?
Yes, our standard 0.84mm PVC 125kHz RFID proximity card has a smooth, printable surface. After applying a thermal transfer overlay, you can print employee photos, names, and department information using a direct-to-card printer. For best results, let us know your printer model before ordering so we can recommend the correct surface finish and overlay type.
Are 125kHz proximity cards secure enough for access control?
125kHz proximity cards provide basic security suitable for most office, residential, and campus access control scenarios. Read-only chips (TK4100/EM4200) have a fixed UID that cannot be easily cloned. For higher security requirements, we recommend using read-write chips (T5577/EM4305) with password protection, or upgrading to 13.56MHz HF cards which support encryption. Contact us to discuss the security level that fits your application.
