The ESL8012A2 from Eclipse MDI is a Limiter with Frequency 8.0 to 12 GHz, CW Flat Leakage 14 dBm, CW Flat Leakage 0.02 W, Peak Flat Leakage 19 dBm, Peak Flat Leakage 0.07 W. Tags: Module with Connectors, PIN-Schottky Diode. More details for ESL8012A2 can be seen below.