How Doosan Tesna Earns Revenue From System-Semiconductor Testing

Wafer testing is the starting point of the business. Doosan Tesna provides electrical testing of system semiconductors while they are still on the wafer, identifying defective dies before later work proceeds. Depending on the product, it also performs final testing after packaging. These services describe the operating business and should not be confused with designing the chip, fabricating the wafer, or selling the finished semiconductor.

After acquiring the company in 2022, Doosan Group officially stated a direction of expanding back-end capabilities from testing into packaging. That strategic direction is different from actual packaging revenue. A plan, facility investment, customer qualification, production order, completed test service, and recognized sales must be confirmed separately.

Revenue comes from test volume and time. A testing company receives wafers and chips from customers, runs them through equipment, and is paid for the service. A chip with complex functions and more test items can take longer to process. Revenue therefore reflects workload and service conditions rather than moving mechanically with the market price of the semiconductor being tested.

Even if a customer's chip shipments rise, the revenue effect can vary with testing rates and equipment efficiency. Customer concentration must be stated only to the extent disclosed in official reports. Industry shipment growth cannot supply an undisclosed customer name, product allocation, test duration, or share of Doosan Tesna's sales.

Capital equipment is a cost before it is utilized. Responding to expected test demand requires expensive testers and factory space to be secured in advance. Ordering a machine does not start depreciation and revenue simultaneously, and installed capacity does not guarantee customer work. The path includes an investment decision, equipment delivery, customer qualification, and use in mass production.

If utilization remains low, expansion can weigh on short-term profitability. That is why the investment announcement and the operating result need different evidence. The purchase of equipment establishes capital spending; qualification establishes permission for defined work; actual testing establishes use; and revenue plus cash flow shows the reported economic outcome.

Product mix matters alongside utilization. System semiconductors such as image sensors, automotive chips, and communications chips can have different test conditions and demand cycles. Stability depends in part on whether volume in one application can offset weakness in another. The disclosed application range establishes areas served, not the exact customer or revenue contribution of every product.

When customer and product volumes are private, broad market growth should not be mapped directly onto company revenue. The appropriate comparison is between the applications the company publicly identifies and changes in reported results. Utilization can rise while mix changes, and those two effects can influence service revenue and profitability differently.

KRW 190.9 Billion of Equipment Is Capacity Before It Is Revenue. On April 28, 2026, Doosan Tesna decided to acquire KRW 190.87709 billion of semiconductor test equipment to address demand. The amount equals 27.12% of total assets, and the transfer date was set for October 30.

First-quarter consolidated revenue was about KRW 76.8 billion and operating profit about KRW 5.5 billion. Those results were generated from existing capacity and customer volume; the April acquisition amount is neither expense nor revenue for that same quarter.

The May 15 quarterly report says testing and engineering services are the principal business and that no separate new business was being pursued as of filing. The next evidence is completion of the October transfer, customer qualification, utilization, depreciation, and operating cash flow.

Cash flow reveals the outcome of expansion. A capital-intensive testing business can report operating profit while cash flow remains weak because equipment purchases consume cash. Depreciation, borrowing, capital expenditure, and operating cash flow therefore belong in the same review. A capacity expansion is not complete as an economic story until equipment is qualified, used for customer volume, and reflected in cash-generating operations.

Testing revenue, management discussion of utilization, purchases of property and equipment, depreciation, and operating cash flow are the central checks. Packaging should be treated as a separate growth line only when actual facilities and customer orders are confirmed. A group strategy from 2022 remains distinct from current qualification, production activity, shipment of tested goods, and sales.

Break-Even Utilization After Expansion. With monthly fixed costs of KRW 6 billion, a contribution margin of KRW 600 per test, and monthly capacity of 15 million units, break-even volume is 10 million units and break-even utilization is about 66.7%.

If test times and rates differ materially by product, stop using an average rate and recalculate separately for product groups such as CIS and application processors.

Comparing fixed costs divided by unit contribution with production capacity reveals the minimum utilization at which expansion turns profitable.