SL50 is a NiZn ferrite with an initial permeability (μi) of approx. 500, a saturation flux density (Bs) of approx. 350 mT at 25 °C (230 mT at 100 °C) and a Curie temperature above 180 °C. Its defining property is temperature stability: the permeability temperature coefficient αμr stays within 0–2×10⁻⁶/K across the full −40 to 140 °C range — essentially flat over the entire automotive temperature span — and with a low loss factor of 18×10⁻⁶ at 0.1 MHz / 35×10⁻⁶ at 1.0 MHz, filter and tuning characteristics do not drift with temperature. In exchange, Bs at 100 °C is only about 230 mT, so the grade is positioned for low-flux and EMI duties rather than power flux. Typical uses are broadband EMI filters, signal-line suppression rings and common-mode chokes, plus RF/IF coils, HF filtering/matching inductors and high-speed data-line beads; it also serves automotive sensors and ADAS, RFID antennas and communication-equipment filters where characteristics must hold across the whole temperature range. Against SL80 (μi approx. 800) of the same wide-temperature family, SL50 offers a lower permeability with a tighter coefficient (0–2 vs 0–4); against the DL family (αμr approx. 20–30×10⁻⁶/K) its drift is an order of magnitude lower — the SL grades are the first choice when temperature-insensitive filtering or resonance is required.