Quality system, inspection gates and change control
Nine inspection gates from wafer incoming to outgoing sampling, 100% electrical test before marking, and a written change notification process. What the system does and does not cover is stated below.
Shenzhen Hexin Electronics Co., Ltd. operates an ISO 9001:2015 quality system covering the design, assembly and test of power semiconductor devices. Every unit is electrically tested for breakdown, on-resistance, threshold voltage and leakage before marking, and lot records link the foundry wafer lot to the shipping carton through ERP, MES and WMS. Changes to die source, mould compound or assembly site are notified by PCN before shipment.
Where inspection happens
Nine gates, each with a defined check and a defined reaction when the check fails. A gate without a reaction is a formality.
| Gate | What is checked |
|---|---|
| Wafer incoming | Foundry lot recorded, wafer-level visual and electrical sampling |
| Dicing | Wafer mounted and diced; edge chipping checked on super junction and SiC die |
| Die attach | Solder or high-temperature attach; voiding checked by X-ray on samples |
| Bonding | Copper wire, aluminium ribbon or clip; wire pull and die shear each shift |
| Moulding | Transfer moulding with UL 94V-0 compound; post-mould cure |
| Plating and forming | Deflash, matte tin plating, lead trim and form to drawing |
| Final test | 100% electrical test: BVDSS, RDS(on), VGS(th), leakage |
| Marking | Laser marking with date code and lot code on every unit |
| Outgoing inspection | AQL sampling on marking, coplanarity, quantity and label |
What final test covers, and what it does not
100% electrical test verifies that a device meets its datasheet limits at one temperature at one moment. It does not verify that the die attach will survive 500 temperature cycles, that the mould compound will resist humidity, or that the wire bond will hold for ten years. Those are covered by the reliability programme, not by final test.
This distinction matters when a supplier claims "100% tested" as a quality argument. It is a strong statement about electrical conformance and a weak statement about lifetime. See reliability testing for the tests that address lifetime, and why power supplies fail in the field for the failure modes that final test cannot see.
Change control
A PCN is issued before a change to die source, mould compound, lead frame supplier or assembly location. It states what changes, why, the qualification evidence and the effective date, and customers may require approval before shipment. A part number that silently changes behaviour is the most common cause of a field failure that cannot be reproduced on the returned sample.
What this system does not cover
It is not an automotive quality system. We do not hold IATF 16949, we do not submit PPAP, and we do not claim AEC-Q101 qualification for any device. If your programme requires those, we are not the right supplier and we would rather say so at the enquiry stage than after an audit. It also does not extend to our foundry partners' internal quality systems — those are separate legal entities with their own certificates.
Credentials and environmental compliance
The quality system is certified to ISO 9001:2015. Packaged product is additionally submitted for SGS environmental testing, covering the restricted-substance requirements that EU and other export markets expect from a discrete semiconductor supplier. The company is recognised as a National High-Tech Enterprise and as a Shenzhen Specialised & Innovative SME. Copies and validity dates are supplied at RFQ rather than published, so a customer never has to rely on a web page for a certificate that may have been renewed.
Certificates, conformance and change notification
Are you ISO 9001 certified?
Yes. The quality system is ISO 9001:2015, covering design, assembly and test of power semiconductor devices. The certificate, its number and validity date are supplied on request. We do not hold IATF 16949 and do not claim it.
Do you issue certificates of conformance?
Yes, with every shipment, alongside the electrical test record for the lot. If your incoming inspection needs a specific format, send the template at RFQ stage and we will confirm whether we can complete it as written.
What happens if a lot fails your outgoing inspection?
It is held, not shipped. The lot is quarantined in the WMS, the failure is analysed — X-ray, C-SAM, shear or electrical — and a disposition is recorded. Customers who already received material from the same wafer lot are notified under the change and anomaly process.
Can I get the reliability report before ordering?
Existing reports for a released part number are shared under NDA. If no report exists for your part, we quote a qualification batch with a lead time, because the stress duration sets the calendar and cannot be shortened by asking.
Need the quality pack for a supplier questionnaire?
Send the questionnaire and the part numbers. We return the ISO 9001:2015 certificate copy, the scope statement, the inspection plan summary and the change notification procedure, with the questions we cannot answer marked rather than left blank.