CA3509M4 L-to-S Band Low Noise Amplifier ICs CEL CA3509M4 L-to-S Band Amplifier ICs offer low noise and high gain in a small flat-lead 4-pin thin-type super mini mold package. The CA3509M4 ICs feature an on-chip bias supply circuit and an on-chip ESD protection diode. The device is ideal for global navigation satellite systems (GNSS), satellite radio antennas, and microwave communications.