What Is Approved Manufacturer List (AML)?
Also known as: AML, approved vendor list for components, manufacturer part number alternates, AVL
Definition
An Approved Manufacturer List (AML) lists the specific manufacturer and manufacturer part numbers (MPNs) that engineering has approved to satisfy a single internal component part number. It lets purchasing buy alternates without a BOM change.
Approved Manufacturer List (AML) Explained
In electronics, one internal part number such as a 10 uF 16 V capacitor can be satisfied by several manufacturer parts that meet the same form, fit and function. The AML records each approved manufacturer and MPN, often ranked by preference. Purchasing and the buyer choose among them based on price, availability and lead time without issuing an engineering change for every substitution.
The AML is related to but not the same as an approved vendor list (AVL). The AML approves who makes the part; the AVL approves who you buy from, such as a franchised distributor. In counterfeit-sensitive sectors, buying only from the manufacturer or authorised distributors listed is a compliance requirement.
In ERP, the AML shows up as an item-manufacturer cross reference or alternate item-source structure, for example manufacturer part number records on an item in Infor, NetSuite or SAP. Receiving verifies that the manufacturer and MPN on the packing slip and reel label exist on the AML, and records manufacturer and lot or date code for traceability.
Approvals are managed through change control, and a PLM system often owns the AML with the ERP receiving a synchronised copy.
Why It Matters
- A broad AML reduces line-down risk during shortages and allocation periods.
- Receiving against the AML blocks unapproved or counterfeit-risk parts from entering stock.
- Customers in regulated sectors audit which manufacturers are approved for each part.
- An accurate AML shortens quoting because buyers can compare real prices across approved sources.
In Practice
Internal part 300-1045 (100 kilohm resistor, 0402) has an AML of three manufacturers. A shipment arrives from a fourth manufacturer because the distributor substituted. Receiving inspection compares the MPN on the label against the AML, rejects the lot to quarantine, and the buyer requests engineering review before any use.
Frequently Asked Questions
What is the difference between AML and AVL?
The AML approves which manufacturers and part numbers can fill an item. The AVL approves which suppliers you may buy from.
Does adding an alternate to the AML change the BOM?
No. The BOM keeps the internal part number; the AML controls which manufacturer parts can be used for it.
Who owns the AML?
Usually engineering or component engineering, often in a PLM system, with the ERP holding a copy for purchasing and receiving.
Related Terms
BOM (Bill of Materials)
A BOM (bill of materials) is the structured, hierarchical list of components, sub-assemblies, and quantities required to produce one unit of a parent item, and it is the primary input MRP explodes to calculate material requirements.
Reference Designator
A reference designator is the unique label for a component position on a printed circuit board, such as R12 for a resistor, C7 for a capacitor or U3 for an integrated circuit. It links the schematic, BOM and assembly machine placement data.
EMS (Electronics Manufacturing Services)
Electronics Manufacturing Services (EMS) is the industry of companies that build electronics for other brands (OEMs) under contract, covering PCB assembly, box build, test and often procurement and logistics. Also called contract electronics manufacturing.
Traceability
Traceability is the ability to follow the history, location, and application of a part or material through the supply chain and production process, both backward to its sources and forward to every product and customer it reached.
Component Obsolescence
Component obsolescence is when a manufacturer discontinues an electronic part, so it can no longer be bought from normal channels. Managing it means detecting end-of-life notices early and choosing a last-time buy, substitute or redesign.
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