noun
packaging density; population density (of components)
Technical term in computing and electronics for how densely components are placed on a circuit board or in a package.
この基板は実装密度が高いため、放熱に注意が必要だ。
Because this board has a high packaging density, heat dissipation requires attention.
Compound of 実装 (じっそう, 'mounting' or 'packaging') and 密度 (みつど, 'density').