# T5577 Keyfob — Multi-Protocol 125 kHz RFID Fob

URL: https://proudtek.com/products/rfid-keyfobs/t5577-keyfob/
Source URL: https://proudtek.com/products/rfid-keyfobs/t5577-keyfob/
Generated: 2026-03-16T01:42:30.697Z
Kind: product
Publisher: Proud Tek Co., Limited
Author: Proud Tek Co., Limited
Credentials: ISO 9001:2015, ISO 14001:2015, RoHS Compliant, CE Marking, REACH Compliant
Image: https://proudtek.com/landing-images/t5577-keyfob.jpg
Image Alt: T5577 multi-protocol 125 kHz RFID keyfob for universal access compatibility

## Description
The rewriteable 125 kHz LF chip (Atmel / Microchip ATA5577) keyfobs are the broadest 125 kHz LF credential ProudTek offers — 330-bit EEPROM, seven data...

## Procurement Snapshot
- Best fit: Best for access control, parking, elevator, and membership credential projects.
- Key options: Form Factor: Compact keyfob form factor for handheld access credentials.
- Customization: Confirm artwork, encoding, material, chip, and finish requirements before quoting.
- Quote checklist: Reference T5577 Keyfob — Multi-Protocol 125 kHz RFID Fob in your inquiry so the matching product page stays attached to the quote. Compact keyfob form factor for handheld access credentials. Share target chip or protocol, quantity,...

## Key Specs
- Form Factor: Compact keyfob form factor for handheld access credentials.

## FAQ
- Q: What is the difference between T5577 and EM4305?
  A: Both are rewritable 125 kHz chips, but T5577 supports more modulation formats and protocol emulations than EM4305. T5577 can emulate virtually every 125 kHz protocol including HID Prox, Indala, AWID and Kantech, while EM4305 supports fewer formats. T5577 is the preferred choice when you need maximum protocol flexibility; EM4305 is adequate when you only need EM4100 emulation or basic HID Prox emulation.
- Q: Can T5577 fobs be locked to prevent tampering?
  A: Yes. T5577 supports a 32-bit write password that must be presented before the chip accepts any write commands. Additionally, the configuration block can be locked separately, preventing changes to the modulation format while still allowing data block updates. For maximum security, apply both the write password and configuration lock.
- Q: What is the MOQ and lead time?
  A: T5577 keyfobs in standard ABS housing: MOQ 100, lead time 3-5 business days from stock. Pre-programmed with your protocol configuration and facility code: MOQ 100, lead time 5-7 business days. Custom housing (silicone, leather, custom shape): MOQ 200-500 depending on housing type, lead time 10-15 business days.
- Q: Is it legal to order T5577 keyfobs that emulate HID Prox?
  A: Yes, for the sites and credentials the orderer is authorised to administer. T5577 itself is a generic ISO/IEC 18000-2 chip and HID Prox H10301 is a published 26-bit format widely implemented by third-party vendors. ProudTek validates orders against legitimate commercial use cases — residential buildings the orderer manages, client sites where the orderer is the integrator of record, locksmith key-duplication services, audit and penetration-testing engagements, or migration programmes where T5577 bridges a legacy reader fleet. ProudTek does not knowingly supply cloned credentials for third-party sites the orderer does not administer.
- Q: How does T5577 compare to a Flipper Zero or Proxmark 3?
  A: Flipper Zero and Proxmark 3 are reader/writer tools used to read an existing 125 kHz credential and write the captured data into a T5577 chip. T5577 is the storage medium, not the reader tool. For bulk-issuance workflows — where ProudTek is programming hundreds or thousands of fobs with a defined facility code and a sequential card-number range — a production-grade RFID writer driven by CSV input is faster and more auditable than a hobbyist tool. ProudTek delivers pre-programmed T5577 fobs with a signed UID-to-card-number mapping so the customer never needs the hobbyist tool in production.

## Machine Routes
- JSON: https://proudtek.com/machine/products/rfid-keyfobs/t5577-keyfob.json
- Text: https://proudtek.com/machine/products/rfid-keyfobs/t5577-keyfob.txt