Transponder coils for automotive applications are compact
Series of EPCOS z-axis transponder coils for passive entry, passive start (PEPS) car access systems have been presented by TDK Corporation. With their dimensions of just 7.7x7.4x2.65mm the components are extremely compact and feature a very low insertion height. The B82451L*E402 series comprises seven transponder coils covering an inductance range from 1.0-10.0mH.
Depending on the type, the transponder coils feature a sensitivity of between 7mV/µT and 23mV/µT at 125kHz. The Q factor of the new components is between 50-58.
The injection-moulded plastic baseplate and laser-welded connections of the winding ensure that the Z transponder coils are extremely robust. The new components are also qualified according to AEC-Q200.
Moreover, the Z transponder coils can be combined very well with the EPCOS B82450A*A* and B82450A*E* transponder coil series for the x- and y-axes. With their footprints of just 11.4x3.5mm and 8x2.7mm, respectively, these components are also very compact.
Solutions using three discrete transponder coils offer high flexibility of design and can save space on the PCB. A design combining the new Z transponder coil with two 8-mm X and Y transponder coils, for example, needs an area of just 100mm². All EPCOS transponder coils are RoHS compatible.