Engineering bill of materials (EBOM)
An engineering bill of materials organizes product components from a design perspective, structured around functional systems and sub-systems as conceived by engineering. The EBOM defines what the product contains without necessarily reflecting how it will be manufactured. It serves as the design authority and starting point for manufacturing planning.
Examples
Medical device EBOM: An infusion pump's EBOM organizes components by functional system: fluid path assembly, electronic control system, user interface module, power system, and enclosure. Each system includes the parts that provide that function, reflecting how engineers conceptualized the design.
Automotive system EBOM: A brake system EBOM includes caliper assembly, rotor, pads, master cylinder, brake lines, sensors, and electronic control unit, organized by the brake system function rather than how these parts will be assembled in the vehicle.
Industrial controller EBOM: The EBOM lists all electronic components, PCB, connectors, firmware, enclosure, and labels that comprise the product, structured to support design documentation and regulatory submissions.
Definition
EBOMs capture design intent and provide the foundation for downstream processes. Engineering owns the EBOM, which represents the product as designed and specifies the form, fit, and function requirements that components must meet.
The EBOM may include items that don't appear in manufacturing BOMs, such as reference documents, software, and specifications. Conversely, manufacturing BOMs include production items like packaging, work instructions, and consumables not tracked in the EBOM.
Translating an EBOM to a manufacturing BOM requires manufacturing engineering input to restructure for production sequence, add manufacturing-specific items, and potentially consolidate or split engineering structures for efficient assembly.
In organizations using PLM systems, the EBOM is typically managed within the PLM environment where it integrates with CAD data, specifications, and change management. The PLM-managed EBOM then feeds ERP systems where it becomes the basis for procurement and production planning.
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