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125 kHz LF RFID Card (Plain White PVC)
₹10 + GST
Min. order 500 pcs
Identium
125 kHz RFID Reader Module, UART (EM4100-Format Tags)
A 125 kHz reader module that outputs the ID of an EM4100-format card, fob or token over a serial UART line, for prototyping attendance, door and asset readers on microcontroller boards. The low-frequency counterpart of the RC522: it reads our 125 kHz cards and tokens, not 13.56 MHz or UHF.
Price on request
Min. order 1 pieceThe final price for your quantity is confirmed in the quote
- 7-day replacement · 1-year warranty against manufacturing defects
- Blue Dart next-day delivery
Key features
- Reads EM4100-format 125 kHz tags: the 64-bit read-only ID used by most LF cards and fobs
- Serial UART (TTL) output, 9600 baud, typical for the class
- 5 V supply, typical for the class
- On-board or external coil antenna, as sourced
- Reads our 125 kHz cards, LF tokens and key fobs at a few centimetres
- Frequency
- 125 kHz (LF)
- Read range
- A few centimetres, typical for the class; depends on the tag
Overview
The simplest reader there is
Hold an EM4100-format card to the coil and the module sends its ID down a serial line as a short string of characters; the microcontroller reads the string and decides what to do. There is nothing to configure. That is why 125 kHz modules are the usual choice for a first attendance, door or locker prototype, and for teaching how a reader talks to a controller. The RC522 and PN532 modules are the 13.56 MHz equivalents.
Which tags it reads
Most low-frequency cards and fobs use the EM4100 format: our 125 kHz cards, LF tokens and LF key fobs, and a T5577 card programmed to that format. It does not read 13.56 MHz cards, UHF tags or the 134.2 kHz FDX-B tags used for animals, which need the RA91 reader. Read range is a few centimetres, typical for the class, and depends on the coil and the tag.
From prototype to product
For a finished installation use a housed reader such as the 125 kHz USB desktop reader or the card attendance terminal, which come ready to connect. Modules are quoted from one unit: request a quote. All our HF, NFC and LF card readers are listed together.
Where to use the 125 kHz RFID Reader Module, UART (EM4100-Format Tags)
- Attendance and door prototypes
- Maker and student projects
- Replacement reader in LF systems
- Teaching labs
- Asset-cabinet prototypes
Specifications
Datasheet (PDF)| Frequency | 125 kHz (LF) |
|---|---|
| Tag format | EM4100 / EM4102-type: 64-bit read-only ID, per the public definition |
| Output | UART serial (TTL), 9600 baud, typical for the class; Wiegand on some boards, as sourced |
| Supply | 5 V DC, typical for the class |
| Antenna | On-board coil or external coil, as sourced |
| Read range | A few centimetres, typical for the class; depends on the tag |
| Does not read | 13.56 MHz cards, UHF tags, 134.2 kHz FDX-B animal tags |
| Supplied | Module only unless stated |
Frequently asked questions
Can I build a finished product around this module?
Development modules are sold for prototyping. Ask us before you build a commercial product around one.
Can it read 13.56 MHz or FASTag?
No. It reads 125 kHz EM4100-format tags only. 13.56 MHz cards need the RC522 or PN532 module, and UHF tags such as FASTag need a UHF reader or the UHF development module.
What does the module send over the serial line?
The tag's ID as a short string of characters at 9600 baud, typical for the class, each time a tag is presented; the exact framing (start and stop characters, checksum) is given in the board's documentation. Your code reads the line and matches the ID against its list.
Buying guides
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