This is the most critical visual in any “hot” datasheet. The SOA graph plots current vs. voltage, with diagonal lines for time and thermal limits.
If the datasheet you are viewing lacks an SOA curve, be very suspicious. nec b58944 datasheet hot
A genuine, downloadable PDF datasheet for the NEC part number B58944 (likely a transistor, diode, IC, or hybrid module), with "hot" implying urgency or current relevance. This is the most critical visual in any “hot” datasheet
NEC b58944 — Quick Specs & Thermal (Hot) Characteristics If the datasheet you are viewing lacks an