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This product is produced in-house by SparkFun.
We are currently planning to build 64 units.

Incoming stock values are estimates, and subject to change without warning.

Description: RFID (radio-frequency identification) is the wireless non-contact use of radio-frequency electromagnetic fields, for the purposes of identifying and tracking tags attached to objects. This is the ID-3LA, a very simple to use RFID reader module from ID Innovations. The only holdups are the 2mm pin spacing and you will need an external antenna. Power the module, hold up a 125kHz card, and get a serial string output containing the unique ID of the card.

Note: The new ID-3LA is essentially the same as the ID-2, but has a lower voltage input.


  • 2.8~5V supply
  • 125kHz read frequency
  • EM4001 64-bit RFID tag compatible
  • 9600bps TTL and RS232 output
  • Magnetic stripe emulation output

Dimensions: 19x21mm


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Customer Comments

  • You can find information about the antennas to use here:

    Regards, Juan David

  • If anybody is looking to connect this to a Raspberry Pi it’s pretty easy. Use one of the 5V pins from the header to power it, along with ground and then just connect the TX pin of the rfid module to the RX pin on the Pi header. I’ve created a Python module that makes interfacing with the reader quite simple.

  • I am working on a project where two objects need to identify each other when close-by. I plan to use this RFID reader along with RFID Tag for each object. So, when two objects (say A & B) come closer, A’s reader reads both tags (A & B) while B’s reader also reads both tags (B & A) and thus by eliminating self tags, objects can identify each other. Would this RFID reader be suitable for such application ? Any problems of interference ?

  • What is the Power consumption of ID-3LA? This is not specified in the datasheet.

    I have done a 1.33 mH coil (44 Ohm serial resistance) and connected it to the module using a 3.0 V supply. It reads tags nicely. I measure the current consumption to about 10 mA. Can I trust this to be a relevant number using my coil design? I guess that a coil with lower serial resistance will increase current consumption, but I’m happy with my current coil (the reading distance is more than enough). Or is there a risk that more current is consumed than what I measure?

    I need this data to the design the power management…

    • I hand-built a coil and documented for posterity’s sake, and my dodgy memory, in excruciating detail here.

      I’m using a 5V supply and got about 6.5".

      How did you measure current consumption? I’m doing to some calculations that when they make sense I’ll post. I put a 1.6 ohm (supposedly 1.5) resistor in series with the coil and measured a Vpp of 55.2mV. That would be about Ipp of 30mA.

      That does kind of jive with your numbers. Irms across the resistor was 11.5mA. Rdc of my coil was 3.9 ohms.

      I’m going to try to remember how to go from Vpp across the inductor to current. I believe that reactance figures into things.

    • Hi Weedogt,

      Can u give me the P/N of coil u used?


      • The coil is my own design. It’s done as tracks on a 6-layer PCB. The size is about a credit card.

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Related Tutorials


SparkFun RFID Starter Kit Hookup Guide

May 5, 2015

Learn the basics of Radio Frequency Identification (RFID) and how to get started with the SparkFun RFID Starter Kit.