SDTR1103CAP - X/Y axis SMD Drop Resistant RFID Transponder Inductor 125kHz / 2.38-9mH / 12.1x4.0x2.9mm

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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X/X/Y axis SMD Drop Resistant RFID Transponder Inductor           

The SDTR1103CAP Series of Surface Mount ferrite wound inductor is the best solution when high electrical and mechanical performance is needed. Its length and cross sectional area are optimized to achieve the maximum sensitivity in the coil axis. The construction of the coil offer high mechanical performance due to the plastic base and ferrite laminate.

High stability in temperature, ranges: 

  • ΔLs/Ls (-40ºC ⇒ 25ºC): -2% max.
  • ΔLs/Ls (+25ºC ⇒ +85ºC): +0.5% max.
  • Typical temperature coefficient ΔLs/ºC: +200±50ppm/ºC. 
  • -40ºC to +125ºC for TPMS applications.
  • -40ºC to +85ºC for Keyless Entry Systems.


  • High sensitivity. 75 mVpp/App/m for 7.2 mH (@125 kHz). 135 mVpp/App/m for 16.2 mH (@125 kHz).
  • Mechanical performance. Drop test: more than 500 times x 1 meter. 
  • CAP protection, 5 sides protected , high reliability with Pick&Place machines warranted.
  • Taped & Reel: 3000pcs / reel.
  • Inductance values from 340μH to 16.2mH for 125KHz operations (contact PREMO RFID for inductance range for other working frequencies such as 20KHz and 40KHz).



  • Inmobilizers.
  • Tire pressure monitoring systems.
  • Keyless entry Systems.
  • Industrial applications.
  • Access control.


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

L (mH)ToleranceQ MinFrequency (kHz)Cres (pF)SRF (kHz) MinDCR (Ω) MaxSensitivity (mVpp/App/m) MinLength (mm)Width (mm)Height (mm)
SDTR1103CAP-0238J 2.38 ± 5% 45 125 680 500 27.5 45 11.9 3.9 2.7
SDTR1103CAP-0491J 4.91 ± 5% 36 125 330 380 68 50 11.9 3.9 2.7
SDTR1103CAP-0720J 7.20 ± 5% 39.5 125 220 300 82 70 11.9 3.9 2.7
SDTR1103CAP-0900J 9.00 ± 5% 40.5 125 180 300 92 80 11.9 3.9 2.7

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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.