How to Record Raw Silicon Wafer Purchases
Accounting for the acquisition of blank silicon wafers (e.g., 300mm) before they enter the photolithography process.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Inventory - Raw Materials (Silicon Wafers) | Asset (+) | 50,000.00 | - |
| Accounts Payable - Wafer Supplier | Liability (+) | - | 50,000.00 |
💡 Accountant's Note
Silicon wafers are the base 'substrate' for chips. In the semiconductor industry, these are high-purity, high-cost raw materials. They are held at cost on the balance sheet until they are 'issued' to a specific production lot, at which point they move into Work-in-Process (WIP).
Practitioner & Systems Framework
💻 ERP Architecture
Inventory must be tracked by 'Lot ID' or 'Ingot Batch.' Any microscopic contamination upon arrival requires a 'Return-to-Vendor' (RTV) entry to clear the asset.
⚠️ Audit Flags
Wastage in storage. Blank wafers are fragile; if a box is dropped or exposed to air, the entire batch must be written off to COGS immediately.
📄 Required Documentation
Purchase Order, Certificate of Authenticity/Purity, and Receiving Report.
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