MMBT2222ALT1G

MMBT2222ALT1G is an onsemi NPN general-purpose transistor in a SOT-23 package, rated at 40 V collector-emitter voltage and 600 mA collector current, with hFE of at least 100 and a transition frequency of 300 MHz — the surface-mount 2N2222A-class workhorse for switching, driver stages, relay and LED drive, and small-signal amplification. Selection advice: this is the natural NPN half of the pair with the PNP MMBT2907ALT1G also listed here; building a complementary stage on the matched onsemi pair keeps gain and saturation behaviour documented by one maker. Read the 600 mA as a ceiling, not a design point: SOT-23 dissipation limits continuous current well below the headline figure at high ambient temperature, so check the saturation voltage and thermal derating at your operating point. Quote the full LT1G code — the G suffix is the lead-free tape-and-reel ordering form; base-code listings without it are not the current orderable part. This is a high-volume commodity transistor where re-marked stock circulates, so lot traceability is worth stating in the RFQ. Parameters verified against onsemi documentation.