Technical Articles
Why Use Network Resistors?
Date:2019-07-22
Networks save limited PC space since a multi-resistor package often takes up less room than individual resistors occupy. They may also reduce needed PC traces if some or all of the resistors have a common connection. Networks also support a routing discipline which enables a cleaner, more logical layout arrangement. On the other hand, they may actually require longer PC-board traces. Besides adding to board crowding and layout challenges, these longer traces may increase noise pickup and adversely affect signal integrity.

 
In terms of production, using a network results in a shorter BOM which, in turn, results in fewer items to order, stock, or risk being unavailable as these networks combine from three to over twenty resistors in a single IC-like package, like Microhm LSP series. Networks also simplify the actual production process as there are fewer component reels to use, and they speed assembly since a single pick-and-place step is need to put the resistors on the board, rather than multiple steps.

 
There are two other factors to keep in mind when deciding to use a resistor network: thermal impact and crosstalk. Although the network package may be operating within its dissipation ratings, it does concentrate this dissipation in a small, localized area. If this location is in a thermal “shadow” zone with marginal airflow, some resistor-network thermal derating may be needed.