RF switch and limiter core — 0805 PIN diode
The GMP4232-GM1 is a single PIN diode from Microchip's GIGAMITE® series, built for RF switching, attenuation, and limiter circuits in the 0805 (2012 Metric) surface-mount format. With a series resistance of 1 Ω at 20 mA forward current and 100 MHz, it presents a low insertion loss path when forward-biased, making it suitable for SPDT or shunt switch configurations up through low-GHz bands. Capacitance is held to 0.35 pF at 50 V reverse bias and 1 MHz — this low off-state capacitance maintains isolation at the switch port by limiting signal feedthrough across the junction.
300 V peak reverse — what it means for the bias network
Rated for 300 V peak reverse voltage, the GMP4232-GM1 handles the voltage swing in high-power RF paths or bias-T networks without breakdown — the I-region width is sized for the full 300 V standoff. The -55°C to +125°C operating range covers military temperature-grade environments, so the diode's low-capacitance and low-resistance characteristics are stable across the full thermal profile of an avionics or base-station RF front-end. Packaged in the standard 0805 footprint, it mates directly with coplanar waveguide or microstrip transmission lines on an RF PCB — no extra tuning pads needed for the 2012 Metric body.
Active lifecycle and compliance posture
ROHS3 compliant and supplied in bulk packaging, the part is ready for lead-free reflow assembly without additional process qualification. The GIGAMITE® series is Microchip's established PIN diode portfolio for RF and microwave applications; the GMP4232-GM1 sits as the 0805, 300 V variant in that family.