IC technical library

T5557 RFID products and specifications

Low frequency identification IC for compatible installed reader systems.

Specify T5557 in a finished Roxtron product

Roxtron manufactures the product formats listed below with this IC option. Select the physical format to review its dimensions, materials, chip specifications and production requirements.

IC specification summary

Specification	Details
Semiconductor IC	T5557
Interface / protocol	125 KHz
Catalog chip designation	T5557
Operating interface	125 kHz
Catalog technology group	125 KHz
Part number selection	Confirm the manufacturer variant, memory layout and reader support with your quotation

Match the complete part number, reader command set and data format before qualification. Frequency alone does not establish interoperability.

Semiconductor technical references

Roxtron product configurations

How to interpret product and semiconductor specifications

T5557 product configurations

Compare construction and dimensions within each format. IC availability depends on the selected antenna, size and approved order specification.

T5557 smart cards

T5557 RFID clamshell card

85.60 × 53.98 mm (or 3.370 × 2.125 in)

T5557 RFID ISO card

85.60 × 53.98 mm (or 3.370 × 2.125 in)

T5557 rfid & nfc labels

T5557 LF 125 kHz labels

125 kHz · custom dimensions

T5557 key fobs

T5557 Angeline™ tag

PVC, epoxy

T5557 RXK01 key fob

53 x 37.5 x 9.8 mm

T5557 RXK02 key fob

35 x 27.5 x 5.5 mm

T5557 RXK03 key fob

38x30x6 mm

T5557 RXK04 key fob

40x33x4 mm

T5557 wristbands

T5557 Rozo™ wristband

290 x 37 mm; Adjustable size by Velcro band.

T5557 RW01 wristband

270 x 37 mm; Custom sizes are available from Roxtron upon request.

T5557 RW05 wristband

Silicone

T5557 RW06 wristband

Multiple sizes available

T5557 RW17 wristband

270 x 37 mm; Custom sizes are available from Roxtron upon request.

T5557 RW27 wristband

246 x 36 mm

T5557 RW35 slap bracelet

280 x 28 mm (Slap Band: Slap band; verify wearer fit)

T5557 disc & embedded tags

T5557 RXD00 transparent disc tag

Diameter 13mm, 15mm, 18mm, 20mm, 22mm, 25mm, 30mm, 35mm, 50mm

T5557 RXR00 white disc tag

Diameter 13mm, 15mm, 20mm, 25mm, 30mm, 35mm

Reader compatibility and manufacturing qualification

Validate the modulation, bit rate and identifier format with the installed low frequency reader. NFC phones do not read 125 kHz credentials. For programmed formats, agree a sample identifier and confirm how the host system interprets it.

Select a finished product above for format specific guidance on dimensions, attachment, antenna placement and operating conditions.

State your required product model, IC order code, printed identifiers, encoding format, initial volume and delivery destination. Roxtron confirms the complete production specification and quotation before manufacture.

Request a quotation