B82451L Transponder Coils EPCOS / TDK B82451L Transponder Coils are z-axis coils designed for passive entry, passive start (PEPS) vehicle access systems and RFID systems at 125kHz. These compact coils feature a low insertion height and dimensions of only 7.7mm x 7.4mm x 2.65mm. The B82451L series includes seven transponder coils with an inductance range from 1mH to 10mH and a sensitivity of 7mV/µT to 23mV/µT at 125kHz. The Q factor ranges from 50 to 58. EPCOS / TDK B82451L Transponder Coils are AEC-Q200 qualified and robust due to the injection-molded plastic baseplate and laser-welded connections of the winding.