The 36 nC gate charge at 5 V keeps switching losses manageable in a 50–200 kHz PWM application. The junction temperature range extends to 175°C, which gives headroom in high-ambient environments like engine bays or industrial enclosures, though the 80 W power dissipation ceiling at case temperature means the PCB copper pour and any heatsink must be sized for the actual load current and switching frequency.
If your design depends on the IRLZ44ZSTRLPBF, secure the last available stock through independent distribution now and begin qualifying a replacement for future production runs. The base product number IRLZ44 covers multiple package and tape variants; the Z suffix indicates the logic-level threshold variant, and the STRLPBF suffix specifies the D2PAK on tape-and-reel.
D2PAK footprint and thermal design
The TO-263 (D2PAK) package has two leads plus the tab, which is the drain connection. The ±16 V maximum gate-source voltage gives margin for overshoot, but the 3 V threshold at 250 µA means the device is fully off below 2.5 V typical — a pull-down resistor on the gate is good practice to prevent float-on during power-up.