Lot Traceability and Quality System: ERP, MES and WMS Records
Lot traceability from foundry wafer to shipping carton through ERP, MES and WMS records, under an ISO 9001:2015 quality system with PCN change control.
Traceability is the ability to walk from a device in a customer’s hand back to the wafer lot it came from, and forward from any wafer lot to every carton shipped. OCENME maintains that chain through ERP, MES and WMS records under an ISO 9001:2015 quality system, with lot codes marked on every unit and PCN notification before process or die source changes.
When this process applies
This page covers the quality system and records behind every shipment: lot coding, MES routing control, incoming inspection of die, outgoing inspection, change notification and document supply. It does not describe a certified automotive quality system, which we do not hold.
Technical specifications
| Quality system | ISO 9001:2015; certificate and scope available on request |
|---|---|
| Systems | ERP, MES, WMS and CRM with lot-level records |
| Lot marking | Laser marking with date code and lot code on every unit |
| Incoming control | Die and lead frame inspected and recorded against supplier lot |
| Outgoing control | AQL sampling on marking, packing and label against packing list |
| Change control | PCN issued before die source, mould compound or process change |
| Document supply | CoC, test record, datasheet, reliability report per lot on request |
Where it is the right choice
- Customers who need lot-specific test records rather than a generic certificate
- Programmes where a die source change must be notified in advance
- Distributors requiring date-code and lot marking that can be read in the field
Where it is the wrong choice
Stating this explicitly matters more than a capability list: if your part falls into one of these categories, another process will cost you less.
- IATF 16949 automotive quality system requirements
- PPAP level 3 submission
- Customer audit rights over our foundry partners — those are separate legal entities
Equipment
- ERP for order, purchasing and shipping records
- MES for routing, station control and lot blocking
- WMS for carton, reel and location control
- Laser marking with lot and date coding
- Outgoing inspection station with AQL sampling plans
Process questions
What exactly can I trace on a shipped lot?
The carton label leads to the packing record, which leads to the assembly lot, the test record with measured values, the die attach and bonding parameters, and the foundry wafer lot that supplied the die. A customer return with a readable marking can be traced back through the same chain. What we cannot trace is the wafer fabrication history in detail, because that belongs to the foundry.
Do you issue PCN notifications?
Yes, before a change to die source, mould compound, lead frame supplier or assembly location. The PCN states what changes, why, the qualification evidence and the effective date, and customers can require approval before shipment. A supplier that changes die source without telling you is the single most common cause of a field failure that "cannot be reproduced".
Is ISO 9001:2015 enough for a switching power supply customer?
For most industrial and consumer power supplies, yes: ISO 9001 plus lot-specific test records and reliability reports covers the usual supplier questionnaire. It is not enough for automotive, medical or some telecom programmes, where IATF 16949, ISO 13485 or specific qualification evidence is required. We tell you which of those we cannot meet before you spend time on an audit.
Can I audit your plant?
Yes, with advance notice and an NDA. We can also provide a video walkthrough of the assembly and test areas for a first screening. Audits of our foundry partners are arranged separately and depend on their own visitor policies.
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