If you have an active BOM line for the STP80NF03L-04, you are looking at last-time-buy inventory that will not be replenished. Plan a replacement qualification now — the next section covers what to look for.
Replacement and cross-shopping
The STP80NF03L-04 sits in the 30 V, 4.5 mOhm class; a drop-in replacement needs the same TO-220-3 footprint, N-channel polarity, and similar gate charge (110 nC at 4.5 V) to keep the driver timing. The STP80NF04L-04 is a common cross-shop candidate — same package, same 30 V rating, but its Rds(on) is typically higher. The STP80NF03L-06 also appears in searches; it shares the same die size but carries a different on-resistance bin. Neither is a direct pin-compatible substitute without checking the gate drive and switching loss budget against your circuit.
At lower gate voltages the resistance climbs; the datasheet gives a second drive point at 4.5 V for logic-level applications. Gate charge is 110 nC at 4.5 V, so your gate driver needs to source that charge fast enough to keep switching losses under control. Input capacitance is 5500 pF at 25 V drain-source, which influences the driver's peak current requirement.
Where can I buy STP80NF03L-04?
We source it through our independent supply network — surplus, new-old-stock, and broker inventory. No stock count or lead-time number is published here because the supply is dynamic.