This post was originally published in 2014 and has since been revised for maximum accuracy.
Electronics manufacturing services are inherently highly complex processes. And they can bring with them a veritable sea of acronyms to get your head around.
In this blog post we've pulled together a list of some of the most common terms and acronyms that you're likely to encounter when you meet with a prospective Electronics Manufacturing Services (EMS) provider.
A fast and repeatable inspection tool that reduces rework by checking component presence, text, orientation, and solder joints.
A machine designed to carry out a variety of tests on different components which can be cost efficient when dealing with stable, high volume products.
A list of parts and/or vendors that meet an OEM's standards in terms of pricing/quality etc. AVL details may be included within the bill of materials or as a standalone document.
A surface mount package used for integrated circuits. Instead of pins or ‘legs’, a BGA consists of pads on the bottom of the device which have tiny balls of solder attached. When these are heated through a reflow oven, they melt to form the connection on the printed circuit board.
A list of all of the devices needed to make a single product. If the assembly of the product needs to be built up in stages, then the BOM may consist of multiple ‘levels’.
The provision of exact technical specifications/instructions for manufacture, provided by to a sub-contractor by an OEM.
Computer software used to create 2D/3D design documents which help OEMs explore and visualise new product concepts.
A provider of design, manufacture, test and distribution services for electronic components and assemblies to Original Equipment Manufacturers.
The date on a purchase order the customer requests delivery for a product or service.
The element of the design effort that focuses on assembling the product in the most cost effective manner, within the shortest time frame, and to the highest quality.
A means of measuring product design variables against manufacturing system performance to help product development teams avoid problems and improve profitability.
The element of design that focuses on ensuring the right test features are incorporated into hardware product designs.
An electronic device package consisting of two parallel rows of pins or ‘legs’.
A DIN rail is the global industry standard metal rail used for mounting circuit breakers and industrial control equipment inside equipment racks.
The report used to communicate details of any product that has failed to comply with a customer's agreed quality standards.
The amount of product that a customer expects to purchase from a supplier within a 12-month time-frame.
The document used to communicate, authorise and justify any agreed changes to a prototype, product or part.
The list of all amended items, assemblies and documentation including drawings, CAD files, standard operating procedures (SOPs) and work instructions.
The start of the engineering change process in which a form is used to detail and proposed changes or improvements to a product or part.
A means of digitally exchanging business documents, such as purchase orders, between two computers.
The range of services provided by Contract Electronics Manufacturers to Original Equipment Manufacturers.
The term given to any part or product that has been, or is intended to be, made obsolete.
An electronic means for a customer to request price and delivery information for a specific product or service.
A description of the broad set of activities that help businesses manage crucial tasks such as project planning, stock control and order tracking.
The process that helps validate that the parts produced comply with agreed engineering design specifications.
The understanding that if the specifications for fit, form and function of one particular part are met, then they can be interchangeable with other parts with the same requirements.
The term given to an item that is ready to be sold.
A form of automated test use printed circuit board assembly to carry out a Manufacturing Defects Analysis (MDA.)
One of the first systematic techniques used when reviewing failure analysis of components, assemblies, and subsystems.
A stress testing methodology for enhancing product reliability by exposing any problems that may have been caused by new manufacturing processes.
The predominant surface finish applied during PCB manufacture, in which boards are immersed in molten tin/alloy (or sometimes silver or gold.)
A production screening method that helps to identify manufacturing defects to improve process control and overall quality.
An industrial automation user interface or dashboard that is used to connect an operator to a controller.
A form of test which provides accurate and high-speed component level testing, with the option of both passive measurements and a degree of ‘power up’ testing.
The strategy of producing just the right amount of any specific product at the time that it is needed.
An industry standard interface that is used for testing and verifying PCBs after assembly.
A list of contractors or companies operating in the UK that are working on government contracts involving classified information.
The agreement between two or more parties before an official contract has been finalised.
How long it takes for an item to be delivered to the customer once the order has been received by the supplier.
The last date on which purchase orders will be accepted by a factory for any part that has been made obsolete.
Following an LTB notification, LTS refers to the last date on which a factory will ship product out, whether directly to the customer or via their distribution channels.
The manufacture of smaller quantities of more complex products that will typically have a larger number of variants and a wider range of production tasks.
An in-circuit testing tool that is used to detect defects within a printed circuit board by measuring continuity.
The smallest quantity of parts that a supplier is willing to accept a purchase order for.
The smallest value that a supplier will accept a purchase order for.
The smallest number of parts that a customer can order from a supplier.
A software- based system for production planning and stock control.
An electronic device which is susceptible to moisture and so will require special handling and storage.
A means of differentiating electronic devices based on their sensitivity of the part. Different levels (from 1 through to 6) dictate specific handling and storage requirements.
A product or part that has been made to fulfil a customer’s firm order demand.
Denoting that a purchase order for a part that cannot be cancelled or returned to the supplier as a result of a lack of, or fluctuation in, demand.
The formal document used to highlight details of non-conformance as the result of a process review or quality audit.
The process carried out by a contract electronic manufacturer on a product that they've not built previously. NPI is often based on a small build quantity to mitigate any unforeseen design or manufacturing issues prior to volume build.
The one-off costs associated with upfront engineering work (build pack creation, machine programming, tooling etc.) that is carried out prior to production.
The term for a company that designs and sells its own products.
A measurement used to determine if delivery to a customer was made according to the purchase order request date.
The measure used to determine that the correct quantity and quality of a product has been delivered to the customer on the agreed order delivery date.
A device that mechanically supports, and electrically connects, electronic components using a combination of conductive tracks, pads and other features etched from copper sheets and laminated onto a non-conductive substrate.
The assembly of electronic devices onto the PCB that result in a finished product.
The official notification, usually from a component manufacturer, that a part they are supplying will be changing in terms of fit, form or function.
A document supplied by a customer to a supplier that confirms the details of the product or service they have ordered.
A value that represents the part of a whole number in units of 1/1000000.
A packaging type, and method, of mounting electronic components onto a PCB by placing the pins or ‘legs’ through drilled holes. The components are then either soldered by hand or by using flow solder equipment.
The process responsible for ensuring the quality of a product is reviewed prior to shipment.
The set of policies, processes and procedures that focus on achieving quality objectives for an organisation's product or service.
The European Union regulation concerning the Registration, Evaluation, Authorisation and Restriction of Chemicals.
An RFI is typically carried out before an RFQ. It can be used by customers as part of the initial supplier section process in order to obtain company and capability information from potential supply chain partners.
The process by which a customer submits an order to obtain price and delivery information for a product or service.
An agreement from a supplier, in the form of a reference number or document, confirming they will take back goods from a customer.
An EU directive restricting the use of hazardous substances (such as lead) that are commonly found within electrical and electronic components.
The process of managing the movement of goods within an organisation, from the receipt and storage of raw materials through to the shipment of finished goods.
An agreement drawn up between the customer and the supplier that contains details of specific service expectations such as pricing, estimated annual usage, delivery, quality and warranty.
An electronic device which is designed to be suitable for surface mount placement.
The method of mounting electronic components, which unlike PTH, involves the device being placed onto pads on the PCB instead of the pins or ‘legs’ being placed through drilled holes.
A method used to monitor, control and improve a process through detailed statistical analysis.
A piece of equipment used to monitor and control solder paste deposition.
A process which helps OEMs realise tangible benefits (such as on-time, in-full and assembly-ready delivery of product) and which aims to reduce total acquisition costs.
A management system in which all members of an organisation are committed to continually improving the processes, procedures, products and service that they offer.
The standard unit by which the quantity of an item is expressed (cm, mm, each etc.)
A term that denotes that additional features or benefits have been provided within a product or service but without additional cost to the customer.
The process in which a supplier is responsible for managing and maintaining agreed inventory levels (which might usually be held on site at a customer’s premises) so they are available for immediate use.
The EC directive that outlines how electronic and electrical goods must be collected and recycled.
A partially complete works order which is awaiting additional parts or processes before it can be completed.
The document that confirms to the manufacturing plant the quantity, revision, build instructions and specifications required prior to completion/shipment to the customer.
A placement programme that instructs a machine as to which component goes where on a board.
So there you have it - an A - Z (well an A to XY) of some of the most frequently used terms used within the electronics manufacturing industry. If you'd like to read similar content on what's new in the world of contract electronics manufacturing then you can subscribe to our blog to receive the latest updates.