ZAC1203 - Z axis SMD RFID Air Coil Low Profile 125kHz / 2.38-6.38mH / 14.3x12x2.5mm

Freq. (kHz)L (mH)Q MinSensitivity (mVpp/App/m) MinHeight (mm)Length (mm)Width (mm)SRF (kHz) MinToleranceCres (pF)DCR (Ω) Max
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Z axis SMD RFID Air Coil Low Profile                                             

This SMD coil offers a very low profile solution for applications in which it’s needed a transponder vertical coil with high sensitivity in z direction and in a small surface area. It’s so a lower profile solution for those applications in which the height of the component is critical. The design has the best electrical performance in these dimensions. 



  • Automotive.
  • Passive Keyless Entry and Keyless Go Systems.
  • RTPMS with wake up functions.
  • Industrial logistics and control.
  • Access control.
  • Tracking device.



  • Very good electrical and mechanical performance.
  • High stability in temperature: (-40°C to +125°C).
  • High sensitivity values achieved with very good.
  • This component is also functional to 20kHz and 134kHz


This chart is a reference guide for the most common required values at working frequency of 125 kHz. Any other inductance value at
LF or tighter tolerances can be provided. Please contact our sales department for any inquiry.


L (mH)ToleranceQ MinFrequency (kHz)Cres (pF)SRF (kHz) MinDCR (Ω) MaxSensitivity (mVpp/App/m) MinLength (mm)Width (mm)Height (mm)
ZAC1203-0238J 2.38 ±5% 18 125 680 1000 93 30 14.3 12 2.5
ZAC1203-0491J 4.91 ±5% 18 125 330 1000 192.5 45 14.3 12 2.5
ZAC1203-0638J 6.38 ±5% 18 125 250 1000 230 50 14.3 12 2.5



Reel dimensions Tape dimensions PARTS/REEL
A B C D E W  P P0   P1  D  
330 50 13 30.4 24.4 24 8 4 2 2.7 0.3 600


All dimensions in mm.




Recommended reflow profile.

Reflow soldering, vapour-phase soldering. A maximum soldering temperature of 260ºC during 10 s should not be exceed for (see recommended soldering profile with maximum and minimum temperature-time).


 The reflow condition recommended is according to the machine used by our company. Big differences will arise as a result of the type of machine, reflow conditions, method, etc used.


1.Rated Inductance LR: Measured at frequency fL, with impedance analyser WK3260 with 3MHz installed.
2.Q Factor Qmin: Measured at frequency fL, with impedance analyser WK3260 with 3MHz installed.
3.Self-resonance frequency fmin:  Measured at frequency fL, with impedance analyser WK3260 with 3MHz installed.
4.DC resistance Rmax: Measured at 20ºC ambient temperature, measuring current <IR.
5.Sensitivity: Measured with Helmholtz coils 5 turns, 160mm ∅, + waveform generator Agilent 33120A + oscilloscope Agilent 54622A. Contact PREMO RFID for complete measurement specification.