PIN diode for RF switching and attenuation
The MMP4405-GM2 is a single PIN diode from the MMP4400 series, packaged in an 0805 (2012 Metric) surface-mount case. It is designed for RF switching, attenuator, and limiter circuits where low insertion loss and high isolation are required across a wide frequency range. Key parametrics: 1000 V peak reverse voltage, 0.6 pF capacitance at 50 V and 1 MHz, and 750 mOhm series resistance at 100 mA forward current and 100 MHz. The 8 W power dissipation rating supports moderate RF power handling in a small footprint.
750 mOhm resistance — insertion loss floor
The 750 mOhm resistance at 100 mA forward bias (100 MHz) sets the forward insertion loss in a series-switch configuration. For a 50-ohm system, this translates to roughly 0.065 dB loss per diode — negligible in most signal paths. The resistance drops further at higher bias currents, which is typical for PIN diodes used in high-power switches.
0.6 pF capacitance — isolation bandwidth
The 0.6 pF capacitance at 50 V reverse bias (1 MHz) determines the off-state isolation. At 2.4 GHz, a single shunt-mounted MMP4405-GM2 provides roughly 20 dB isolation; at 6 GHz, it drops to about 15 dB. This makes the part suitable for sub-6 GHz RF front-ends, including Wi-Fi, cellular, and ISM-band switches.
1000 V peak reverse — high-voltage RF switching
The 1000 V peak reverse voltage rating is unusually high for a PIN diode in an 0805 package. This allows the MMP4405-GM2 to handle RF voltage swings in high-power transmitter stages — antenna tuning, T/R switching in base stations, or plasma generator matching networks — without breakdown.
ROHS3 compliant.