MMBFJ177LT1G

MMBFJ177LT1G is an onsemi P-channel JFET in a SOT-23-3 package, rated at 30 V with drain-source saturation current (IDSS) from -1.5 mA to -20 mA and on-resistance of 300 Ω — an analog switching and sampling element for signal routing, sample-and-hold circuits, choppers and high-impedance front ends where a JFET's gate characteristic beats a MOSFET or a CMOS switch. The suffix is the selection point and a real ordering trap: order the LT1G code — onsemi lists the same device without the G suffix as Obsolete, so a BOM that stops at MMBFJ177L points at a dead code. Selection advice: JFET parameters spread widely by nature, and the -1.5 mA to -20 mA IDSS window here is the honest datasheet range — design the bias and switching thresholds for the spread or plan a binning requirement, and state it in the RFQ so the offered lot is checked against it. For new analog-switch designs also compare modern CMOS switches on charge injection and leakage before committing to a JFET. Parameters verified against onsemi documentation.