Bill of Materials (BOM) export in PCB Design - Dashboard Guide

Dashboard Mode - Bill of Materials (BOM) export

Goal

Understand the total quantity and cost of components needed for a PCB project by analyzing the Bill of Materials (BOM) export.

Sample Data

Component	Part Number	Quantity	Unit Cost ($)	Category
Resistor 10kΩ	R10K-1	50	0.05	Passive
Capacitor 100nF	C100N-1	30	0.10	Passive
Microcontroller	MCU-123	1	3.50	Active
LED Green	LED-G-5MM	10	0.20	Optoelectronic
Connector USB	USB-CONN-1	2	1.00	Connector
Crystal 16MHz	XTAL-16M	1	0.75	Passive
Voltage Regulator	VR-5V	1	1.25	Active

Dashboard Components

• Total Components Count: Shows the sum of all component quantities.
  Formula: SUM(Quantity) = 50+30+1+10+2+1+1 = 95
• Total Cost: Calculates total cost by multiplying quantity and unit cost for each component and summing.
  Formula: SUMX(BOM, Quantity * Unit Cost) = (50*0.05)+(30*0.10)+(1*3.50)+(10*0.20)+(2*1.00)+(1*0.75)+(1*1.25) = 2.5+3+3.5+2+2+0.75+1.25 = 15.0
• Cost by Category: Bar chart showing total cost grouped by Category.
  Calculation: Sum of (Quantity * Unit Cost) per Category:
  • Passive: (50*0.05)+(30*0.10)+(1*0.75) = 2.5+3+0.75 = 6.25
  • Active: (1*3.50)+(1*1.25) = 3.5+1.25 = 4.75
  • Optoelectronic: (10*0.20) = 2.0
  • Connector: (2*1.00) = 2.0
• Component Details Table: Lists all components with columns: Component, Part Number, Quantity, Unit Cost, Total Cost (Quantity * Unit Cost).

Dashboard Layout

+----------------------+----------------------+
| Total Components: 95 | Total Cost: $15.00   |
+----------------------+----------------------+
|                      Cost by Category Bar Chart                      |
|  Passive | Active | Optoelectronic | Connector                        |
+---------------------------------------------------------------------+
| Component Details Table (all columns including Total Cost)          |
+---------------------------------------------------------------------+

Interactivity

A category filter allows selecting one or multiple categories. When a category is selected, the Total Components and Total Cost KPIs update to show sums only for selected categories. The Cost by Category bar chart highlights the selected categories. The Component Details Table filters to show only components in the selected categories.

Self Check

If you add a filter to show only the 'Passive' category, which components and totals update?

• Total Components: 50 + 30 + 1 = 81
• Total Cost: 6.25
• Cost by Category: Only 'Passive' bar highlighted
• Component Details Table: Shows Resistor 10kΩ, Capacitor 100nF, Crystal 16MHz only

Key Result

Dashboard shows total quantities and costs of PCB components from BOM with category breakdown and detailed table.

Practice

1. What is the main purpose of a Bill of Materials (BOM) export in PCB design?

easy

A. To list all parts needed for the PCB assembly

B. To create the PCB layout design

C. To simulate the electrical signals

D. To generate the soldering instructions

Solution

1. Step 1: Understand BOM export function

   A BOM export lists all components required for the PCB, including quantities and specifications.

2. Step 2: Differentiate from other PCB tasks

   PCB layout design, simulation, and soldering instructions are separate tasks not covered by BOM export.

3. Final Answer:

   To list all parts needed for the PCB assembly -> Option A

4. Quick Check:

   BOM export = parts list [OK]

Hint: BOM export = list of parts needed [OK]

Common Mistakes:

• Confusing BOM export with PCB layout design
• Thinking BOM export includes simulation data
• Assuming BOM export creates soldering guides

2. Which of the following is the correct CSV header line for a basic BOM export file?

easy

A. Part Number,Description,Quantity,Footprint,Value

B. Quantity,Value,Part Number,Footprint,Description

C. Description,Part Number,Value,Quantity,Footprint

D. Value,Footprint,Quantity,Description,Part Number

Solution

1. Step 1: Identify standard BOM column order

   Common BOM exports start with Part Number, Description, Quantity, Footprint, and Value in that order.

2. Step 2: Check each option's header sequence

   Part Number,Description,Quantity,Footprint,Value matches the standard order; others mix columns incorrectly.

3. Final Answer:

   Part Number,Description,Quantity,Footprint,Value -> Option A

4. Quick Check:

   Standard BOM header = Part Number,Description,Quantity,Footprint,Value [OK]

Hint: Standard BOM headers start with Part Number and Description [OK]

Common Mistakes:

• Mixing column order in CSV header
• Omitting Quantity or Footprint columns
• Using inconsistent column names

3. Given this BOM export snippet:

Part Number,Description,Quantity,Footprint,Value
R1,Resistor,2,0805,10k
C1,Capacitor,1,0603,1uF
R2,Resistor,3,0805,10k

What is the total quantity of 10k resistors in the BOM?

medium

A. 2

B. 6

C. 3

D. 5

Solution

1. Step 1: Identify 10k resistors in the BOM

   R1 and R2 are resistors with value 10k; quantities are 2 and 3 respectively.

2. Step 2: Sum the quantities of 10k resistors

   Total quantity = 2 (R1) + 3 (R2) = 5.

3. Final Answer:

   5 -> Option D

4. Quick Check:

   2 + 3 = 5 resistors [OK]

Hint: Add quantities of matching parts by value [OK]

Common Mistakes:

• Counting only one resistor line
• Confusing quantity with part count
• Ignoring multiple entries for same value

4. You exported a BOM but the Quantity column shows zero for all parts. What is the most likely cause?

medium

A. The file format is incorrect

B. The design has no components placed

C. The export settings excluded quantity data

D. The part numbers are missing

Solution

1. Step 1: Analyze zero quantity issue

   Zero quantity usually means quantity data was not included or calculated during export.

2. Step 2: Check export settings impact

   If export settings exclude quantity, the BOM will show zero even if parts exist.

3. Final Answer:

   The export settings excluded quantity data -> Option C

4. Quick Check:

   Missing quantity data = export settings issue [OK]

Hint: Check export options for quantity inclusion [OK]

Common Mistakes:

• Assuming no components placed without checking design
• Blaming file format instead of export settings
• Ignoring quantity column configuration

5. You want to customize your BOM export to include supplier part numbers and cost per unit. Which approach is best?

hard

A. Manually edit the exported CSV file after export

B. Add custom columns in the BOM export settings and map supplier data

C. Use a separate spreadsheet to track supplier info and costs

D. Ignore supplier info and only export standard BOM columns

Solution

1. Step 1: Understand BOM customization options

   Most PCB tools allow adding custom columns in BOM export settings to include extra data like supplier part numbers and costs.

2. Step 2: Compare approaches for accuracy and automation

   Adding custom columns ensures data is included automatically and stays consistent, unlike manual edits or separate spreadsheets.

3. Final Answer:

   Add custom columns in the BOM export settings and map supplier data -> Option B

4. Quick Check:

   Customize BOM export settings for supplier data [OK]

Hint: Use BOM export settings to add supplier columns [OK]

Common Mistakes:

• Editing CSV manually risks errors and is inefficient
• Using separate spreadsheets causes data mismatch
• Ignoring supplier info reduces BOM usefulness