Wafer Backgrinding and Thinning

The wafer backside is ground away to reduce a 775-micron substrate to a package-compatible thickness, sometimes below 50 microns for stacked die.

Tier C: Not a Founder’s Game Yet High criticality

A two-supplier global equipment market with a Japanese incumbent that has held it for thirty years. Not contestable from a standing start.

What It Does

Grinds the wafer down to package-thin, sometimes hair-thin

Thins the wafer from bulk thickness down to what packaging needs.
Below a certain point, the wafer becomes fragile and easy to crack.
One Japanese company dominates the machines; no real Indian entry.

India Position

Import dependency: Not established
Made in India today: None
MSME entry capital: Not an MSME entry
Time to qualify: Over 30 months

Not established means we hold no sourced import figure for this input yet, not that India imports none of it. Read Made in India today for the domestic picture.

Neither the grinders nor the tape are made in India.

What Breaks, and Who Could Fix It

What breaks

Below roughly 100 microns the wafer becomes a warping, chipping liability, and every downstream step inherits whatever damage this one leaves. Thin-wafer handling is the quiet discriminator between a competent OSAT and a struggling one.

Who could fix it

The grinders themselves are DISCO-dominated to a degree that has no real second source. Entry is as a consumable supplier or as a subcontract thinning service, not as an equipment maker.

Best and worst case

Best case if this breaks

For thick, single-die packages the process window is generous and yield loss is small.

Worst case if this breaks

Thin-die cracking that only shows up as a reliability failure in the field is the single most expensive class of packaging defect, because it escapes final test.

Best case to fix it

Backgrind tape and the grinding wheels are consumable positions an Indian abrasives or specialty-film firm could plausibly reach.

Worst case to fix it

A subcontract thinning service needs the customer’s die in your building, which is a qualification and liability conversation years ahead of where Assam sits today.

Representative Suppliers

Listing a firm documents the market as we understand it. It is not an endorsement, a recommendation, or evidence of any commercial relationship.

Supplier	Origin	Scale	Confidence
DISCO The dominant grinder supplier; TAIKO thin-edge grinding is its process.	Japan	Large	Verified
Tokyo Seimitsu (Accretech) The only meaningful second source for grinders.	Japan	Mid	Reported
Revasum	United States	Small	Likely
Lintec Backgrind tape.	Japan	Mid	Reported
Nitto Denko Backgrind tape.	Japan	Large	Reported

Where It Is Consumed

Step 1: Die Receipt and Preparation

Incoming wafers are mounted, thinned by backgrinding, and separated into individual die by saw or plasma dicing.

Sources

TSAT packaging process and MSME component map as of 2026-08

Last reviewed 2026-08-28.

How to read this page

Reading Key

Every entry carries the same five figures, so two inputs anywhere in the chain can be compared directly. What each one is, and what it is not:

Import dependency: The share of Indian demand for this input that is met by imports today. A percentage is published only where we can state the basis for it, and the build rejects a figure that has none. “Not established” means no sourced figure exists yet, not that the figure is zero; for the domestic picture, read “Made in India today” instead.
Made in India today: How much of this input is actually produced in India: none, pilot scale, partial, or established. This is the field to read when import dependency is not established.
MSME entry capital: What it would plausibly cost an Indian MSME to enter this input at the smallest viable scale, in crore rupees. Plant and equipment only; it excludes working capital and the qualification cycle.
Time to qualify: How long from a working sample to a qualified first shipment, once the line exists. Qualification, not construction, is what usually decides whether an entry succeeds.
India readiness tier: Our verdict on whether an Indian founder can realistically enter this input, derived from the four figures above and stated as one of three tiers.

The three tiers

Tier A: Buildable Now: Under roughly Rs 5 crore of entry capital and 12 to 24 months to a qualified first shipment. A founder can start here.
Tier B: Partnership or Distribution: There is real money here, but not in manufacturing the thing. The opening is in stocking, distribution, purity uplift or a licensed partnership.
Tier C: Not Yet: Requires a joint venture, a technology licence, or a multinational’s balance sheet. Worth understanding, not worth starting.

Made in India today

None: No Indian production we can identify. Demand is met entirely from abroad.
Pilot scale: Made in India at laboratory, pilot-line or single-customer scale only.
Partial: Real Indian production exists, but it covers part of the range or part of the demand.
Established: Indian production is routine and qualified, at commercial volume.

Confidence

Confidence describes how well evidenced our listing is. It is not a rating of the supplier or of its products.

Verified: Checked against a primary source: the firm’s own filing, product documentation or announcement.
Reported: Consistently reported by trade press or industry analysts, but we have not seen the primary document ourselves.
Likely: A credible supplier for this input given their product range, though we have not confirmed that they actually supply it.
Directional: Included to show the shape of the market. Read it as an observation, not as a claim about this firm.

Scale

Scale is a bucket, not a revenue figure. We publish a band we can hold for years rather than a number that is stale in a quarter.

Mega: A global top-tier firm that effectively sets the price and the standard for this input.
Large: A major international supplier, usually with plants or sales in several regions.
Mid: An established specialist, often strong in one region or one product family.
Small: A niche or regional supplier. Frequently the realistic first partner for a new Indian entrant.