400 mW Zener — what the power rating means for the BOM
The HZS11C3TD-E is a 0.4 W Zener diode from the HZS series, rated for 400 mW total power dissipation. That 400 mW ceiling is the key derating number: at ambient temperatures above 25 °C, the allowable dissipation drops, so the designer must check the thermal derating curve in the datasheet to confirm the junction stays within limits at the operating current. For a typical 11 V Zener, 400 mW translates to roughly 36 mA maximum continuous current — enough for low-power shunt regulation, voltage clamping, or reference biasing in a mixed-signal rail.
Active lifecycle, ROHS3 — no obsolescence watch needed
The ROHS3 compliance covers the latest EU exemption roll-up, so it passes for new designs shipping into regulated markets.
Bulk packaging — hand-assembly and low-volume fit
That suits hand-insertion, prototype runs, or repair-stock replenishment where a pick-and-place feeder setup is not justified. For automated lines, confirm the package format matches the feeder; if tape-and-reel is required, check the HZS11C3T variant or the broader HZS family for reel options.