What is purpose of the transistor in the circuit, switch? or analog output?
There are different fabrication processes that make 'vertical' type mosfets, that is typically they exhibit exponential transfer. Hexfet is a type of multi-cellular architecture, many small transistors in parallel across the die. During high conduction each transistor cell exhibits negative temp co (decrease in conductance vs temperature), so the current is better shared across the die, thus they do not 'hot spot' like BJT's do. Planer Stripe is a more recent semi fab process that seem to be similar to hexfets in that they also have neg temp-co between the stripes, making them suitable for analog outputs. Trench-Fets and U-Fet is another semi-fab that produces very low Rds on, great for switching but are not suitable for analog output as they tend to hot-spot under those conditions.
There are different fabrication processes that make 'vertical' type mosfets, that is typically they exhibit exponential transfer. Hexfet is a type of multi-cellular architecture, many small transistors in parallel across the die. During high conduction each transistor cell exhibits negative temp co (decrease in conductance vs temperature), so the current is better shared across the die, thus they do not 'hot spot' like BJT's do. Planer Stripe is a more recent semi fab process that seem to be similar to hexfets in that they also have neg temp-co between the stripes, making them suitable for analog outputs. Trench-Fets and U-Fet is another semi-fab that produces very low Rds on, great for switching but are not suitable for analog output as they tend to hot-spot under those conditions.
Semiconductor manufacturers are always trying to get more components from a wafer. This reduces the cost of each component. It appears that the most important criteria are the current ratings. If they can make a smaller die that can pass the same amount of current, they will use the smaller die (or at least make it available as a substitute).
As an example, the IRFZ44 (no suffix) typically has the largest die of all of the IRFZ44 FETs (Z44N, Z44V...). This makes it able to handle high current transients better but otherwise it's about the same as the other versions.
As an example, the IRFZ44 (no suffix) typically has the largest die of all of the IRFZ44 FETs (Z44N, Z44V...). This makes it able to handle high current transients better but otherwise it's about the same as the other versions.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.