A back-end semiconductor plant (ATP — assembly, packaging and test) is among the most infrastructure-demanding factory types: a split-second power dip can scrap a whole wafer lot in process, off-spec feed water cuts yields, and micro-vibration from an adjacent transport road disturbs precision test equipment. When leasing land for an ATP project in Vietnam, three requirement systems — power, water and site — must be diligenced on technical data before price is discussed. This article presents them in practical diligence structure.
1. Power: not just large capacity, but uninterrupted source quality
ATP lines (wafer dicing, die attach, packaging, test) consume large power and are extremely sensitive to voltage quality: a short voltage sag can stop the line and ruin the running lot. Site requirements: supply from two independent source substations with automatic changeover, the industrial/high-tech park’s commitment on voltage level and capacity by expansion phase, and the park’s historical power-incident data (outage counts, durations, sags) for the last 2–3 years — an ATP project should demand this data in writing rather than from a sales pitch. The plant must still self-invest backup systems (UPS for sensitive loads, generators for essential loads) and voltage stabilisation — the land lease should record the right to install these systems and the area reserved for them. On renewable energy: global semiconductor supply-chain customers commonly require a renewable-electricity roadmap (RE100-type targets in the supply chain) — the ability to join the direct power purchase agreement (DPPA) mechanism under Decree No. 57/2025/ND-CP as amended in that locality is an increasingly important site criterion for export-oriented ATP projects.
2. Ultrapure water and wastewater: the plant builds its own system on a stable feed base
Washing and processing stages in ATP use ultrapure water (UPW) with very high resistivity and extremely low particle/ion limits. UPW is not supplied directly by the park: the plant builds its own UPW station from park feed water — so the land requirement is the quality and stability of source feed water (hardness, total dissolved solids, seasonal variation) and maximum supply volume, because input quality decides UPW operating cost. On the output side: ATP wastewater contains fluorine compounds, ammonia and metal traces from surface treatment and washing stages — it must be pre-treated at the plant to the central plant’s intake limits, and the project requires an environmental impact assessment (EIA) under the Law on Environmental Protection No. 72/2020/QH14 with the corresponding environmental licence. In diligence, require the park to provide: wastewater intake standards and spare capacity of the central plant, and the park’s discharge compliance history — a park once sanctioned for discharge is a shared risk for every plant in it when global customers audit the supply chain.
3. Site: cleanroom, vibration control, specialty gases and airport logistics
Four ATP-specific site requirements. First, cleanrooms at the ISO class fitting each stage — the factory floor must support cleanroom structures and precision air conditioning running 24/7, so clear height and floor load are parameters to fix in the technical annex of the land lease (if leasing land to self-build) or of the ready-built factory lease. Second, vibration control: test equipment and some precision stages are affected by ground vibration — a plot beside heavy truck routes, railways or stamping plants is a disadvantage; commission a ground-vibration survey where the project has sensitive equipment. Third, specialty gases and chemicals: ATP uses process gases and chemicals (surface treatment solutions, inert gases and certain specialty gases) — the site must allow compliant chemical/gas storage areas meeting current safety and fire rules. Fourth, logistics: wafers and finished chips are high-value, light goods moved mainly by air — distance and time to an international airport and road quality are practical site criteria; many ATP projects in Vietnam choose high-tech parks/IPs near major airports for this reason. The high-tech park incentive and management framework (one-stop mechanism through the management board) is also a plus when comparing with an ordinary IP.
4. Lease structure and infrastructure risk allocation
An ATP project has two main site options: long-term land lease to self-build (maximum control of technical parameters, in exchange for large capex and long construction), or leasing a standard-ready factory in a high-tech park (fast, but power/water/cleanroom parameters bounded by the existing design). Whichever model, the infrastructure risk-allocation principle is the same: every commitment on power capacity, water volume and feed quality, and wastewater intake standards must be written as sanctioned clauses in the lease — with phase milestones for full supply, the plant’s right to self-invest supplementary infrastructure if the park responds slowly, and a compensation/rent-reduction mechanism when shared infrastructure fails its commitments and stops production. The land term should match the semiconductor project’s long life cycle (per the project term frame and the park’s remaining term), with priority extension and adjacent-plot expansion rights — relocating an ATP plant mid-life is nearly cost-infeasible, so site stability is an asset to buy with clauses from the start.
Frequently asked questions
How does ATP differ from a wafer fab in site requirements?
A fab (wafer fabrication) is a level higher in every respect: much higher cleanroom classes, far larger UPW and chemical volumes, extremely low ground vibration and an order-of-magnitude more capital. ATP (packaging, test) is lighter but still in the group of plants with strict power, UPW and cleanroom requirements — it cannot sit in a generic factory shell. Most semiconductor projects entering Vietnam today are ATP and supporting stages, so this article’s criteria are written for ATP-level requirements.
Can an ordinary industrial park meet an ATP project’s requirements?
Some high-tech IPs and IPs with high-grade power/water infrastructure can; ordinary IPs usually fall short on three points: a stable dual-line supply with good incident data, stable feed-water quality for a UPW station, and intake capacity for specialised industrial wastewater. Diligence must rest on each park’s technical data, not on the “high-tech” label in its marketing.
Does the park supply ultrapure water, or does the plant produce it?
The plant produces UPW itself from park feed water with its own UPW station — the park only supplies industrial water at the committed source quality. Feed-water quality and stability are therefore the real land-negotiation parameters, while the UPW, recirculation and water-reuse systems are the plant’s investment needing corresponding area and power in the site layout.
Are there semiconductor-specific incentives affecting the land decision?
The semiconductor industry is among Vietnam’s priority investment-attraction sectors with dedicated support programmes (including workforce training support and semiconductor supply-chain policies), and projects in high-tech parks enjoy the one-stop mechanism through the park management board. Specific tax incentives and support depend on each project’s scale and structure and must be confirmed during Investment Registration Certificate issuance; when comparing sites, compare the written, confirmable incentive packages between parks rather than general marketing commitments.
This article has been quality-reviewed by the FLAW AI Legal Council
