Fab desk

Packaging and test: the back end, where India actually started

Published 3 August 2026. Facts verified to 27 July 2026 unless dated otherwise.

A finished wafer is not a product. Turning it into something a circuit board can use is a separate industry, and it is the one India entered first.

The sequence after the fab

Wafers arriving from the front end are first probed: each die is electrically tested in place, and failures are mapped so that bad die are not packaged. The wafer is then thinned and diced into individual chips. Good die are mounted onto a substrate or leadframe, electrically connected, either by fine wire bonds or by flipping the die onto solder bumps, then encapsulated in moulding compound and marked. Finished parts undergo final test, often across temperature, before shipping.

Why the back end was India's entry point

Back-end plants are less capital-intensive than wafer fabs, have shorter build timelines, and depend on precision assembly and test capability rather than the extreme physics of lithography. That makes them a rational first step for a country building semiconductor capacity, which is why India's early flagship semiconductor plant is an assembly and test operation at Sanand, roughly 100 km from Dholera, a distinction constantly blurred in coverage and corrected on our answers page DURABLE.

Advanced packaging: no longer the junior partner

For decades packaging was treated as commodity work. That has changed. As shrinking transistors has become slower and more expensive, more performance is being extracted by how die are combined: stacking them vertically, placing multiple dies on a shared interposer, and building modules that behave like one large chip. This has turned advanced packaging into a genuine technology frontier with its own capital intensity and its own competitive stakes.

For a country building an ecosystem, that shift is good news: it means back-end capability is not a permanent second tier, and investment there can compound into genuinely advanced capability rather than remaining low-value assembly.

How the two ends fit together in Gujarat

A front-end fab building at Dholera and a back-end plant operating at Sanand is, on paper, a complete pairing, and the state's semiconductor geography is mapped on our ecosystem page. In practice the two need not serve each other, wafers travel globally and packaging serves whoever pays, so the honest statement is that co-location creates the option of an integrated domestic chain, not the certainty of one. Whether it converts is a decade-long question this record intends to keep asking.