Contract manufacturing of electronics and the admissibility of IPC electronic assemblies
The IPC-A-610 standard was introduced in August 1983, and the E edition - the sixth edition of the document - was widely adopted in March 2010 and recognized by experts from the electronics industry around the world. The text of the standard has been translated into 15 languages. The purpose of IPC-A-610E is to reflect the requirements of applicable IPC standards and other documents. To use the information contained in this standard, the electronics assembly (electronic device) must meet the requirements of current IPC standards, such as IPC-7351, IPC-2220, IPC-6010 and IPC-A-600. All these standards have been described by The European Committee for Standardization (CEN). If the assembly does not meet these or similar requirements, acceptance criteria must be agreed separately by the customer and the SMD assembly company.
Classification
The decision to accept or reject a product should be based on appropriate documentation, such as a contract, drawings, specifications.
The criteria established by the IPC-A-610E standard correspond to three classes similar to those specified in the J-STD-001E standard:
Class 1. General electronic products. • Includes products whose main requirement of the customer is the ability to work of the final product.
Class 2. Specialized electronic products. • Includes products that require uninterrupted operation and longer life, and the failure-free operation of these electronic devices is desirable but not critical. The operating conditions of such devices are usually not a cause of failure.
Class 3. Electronic products for extraordinary applications. Covers products for which work continuity with improved properties or work when necessary is critical, periods of equipment malfunction are not allowed, and operating conditions can be extremely difficult. Equipment should always work when required, for example in rescue equipment systems.
The responsibility for the final decision regarding the class to which the product should belong rests with the purchaser of electronics. If the customer and manufacturer have not agreed and documented the product class, the manufacturer does it himself.
The IPC-A-610E standard is 420 pages of documentation and instruction for technical specialists working in the electronics industry, specialists in SMD / SMT optical control.
The standard provides a description of the ideal contract manufacturing electronics output, acceptability of deviations and critical defects for many issues, here are some of them:
- Laying SMT components
- Joining.
- soldering.
- Contact connections.
- Hole mounting technology.
- Surface mount.
- Component damage.
- Printed circuit boards and modules.
- Wired installation.
- High voltage
| Source | Humidity 10-20% | Humidity 65-90% |
|---|---|---|
| Walking on the carpet surface | 35 000 V | 1500 V |
| Walking on vinyl flooring | 12 000 V | 250 V |
| The employee stands still | 6000 V | 100 V |
| Vinyl folders | 7000 V | 600 V |
| Plastic bag raised from the floor | 20 000 V | 1200 V |
| Employee chair with foamed filling of the seat | 18 000 V | 1500 V |
This article uses materials from author Lars Wallin.