3-Axes RFID Transponders (3DCoils)

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3D SMD Transponder Coil Epoxy Molded - 3.45mH - 3DC06EM-S-0345J
3D SMD Transponder Coil Epoxy Molded...
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RFID Transponder.

RFID Transponder Definition.

An RFID system works with an RFID transmitter/reader which transmits energy and an RFID tag/transponder which sends the information and is always located on the object to be identified.

This RFID transponder can be used in different applications. Some of them are Automotive PKE systems and TPMS, animal identification, etc.

There are 2 types of RFID transponders:

- Single Axis Transponder: smaller size and just send information in one direction. Perfect for TPMS Systems.

- Three-Axis Transponder: is a combination of three single axis that allow the system works regardless orientation of the key. Perfect for PKE/KES

RFID Transponders requirements (Electrical and mechanical).

In order to select the proper transponder RFID tag, it must be taken in mind some electrical and mechanical parameters. Here, we review all these parameters.


This is the main parameter of RFID transponder. At higher inductance, better performance inside magnetic field.

The inductance needed on an RFID transponder should works with a capacitor as LC tank, so inductance should match with capacitor.

Q factor:

The Quality factor means the relation between Inductance and Resistance. An RFID transponder with high Q factor has a resonance with more amplitude but has less 3dB bandwidth. This means more Reading distance but will be more affected to deviations in manufacturing tuning of the transponder.

Some chips need a minimum Q factor for proper working (for proper reception).

DC Resistance:

This parameter is strongly linked with Q factor parameter and can be reduced using larger wire diameter. Main restriction is the maximum resistance than customer IC can manage.

The RFID Chips have an impedance limit, so there is always some DCR max (resistance due to winding wire).


The Self-Resonance Frequency (SRF) of the RFID transponder is the frequency at which inductive and capacitive components of the transponder impedance are equal.

In that frequency, the RFID transponder stops working as an inductor and start working as capacitor. The practical rule is that SRF should be almost twice of working frequency of the RFID transponder.


Sensitivity refers to the level of induced voltage in the RFID transponder coil at certain level of field power. It’s unit is typically represented as mV/A/m or mV/uT.

Higher sensitivity means that the coil/transponder catches more power from magnetic field (allowing proper working of the chip). Usually, the chip needs some minimal of sensitivity value.

Capacitive and inductive coupling (parasitic):

Capacitive and inductive coupling limit SRF of the RFID transponder and the working frequency.

How to reduce: Increasing pitch winding, using higher wire diameter, using several sections of windings instead one section: Is related with the non-orthogonality of the three-axis of the 3D coil.

Premo RFID Transponder Catalog.

PREMO is leading manufacturer in RFID transponder design inductances for SMD assembly processes focused mainly on the automotive market applications, animal identification and industrial logistics applications.

Most of the coils produced in PREMO are 125KHz RFID transponders for automotive applications and 134KHz RFID transponders for animal ID applications.

The main advantages of PREMO transponders are:

  • - A broad variety of standard products competitive in price.
  • - Highest sensitivity in the market in the lowest profile.
  • - Very stable performance in full temperature range -40ºC ~ +125ºC. Very important characteristic in RTPMS and KES applications.
  • - High Q factor and low Rdc which allow higher current capacity.
  • - Different mechanical options for different requirements.
  • - Highest raw material quality and performance.
  • - High-quality standards ISO TS. 

RFID Transponder

You can review, see technical specifications, and buy online all Premo 3-axis RFID Transponders by clicking on each part.

Also, if you need technical help in order to select the right transponder for your application, you can contact us via our form or via our live chat.