Questions tagged [bom]

Bill Of Materials: The list of components for an assembly. All of the individual parts that go into the manufacturing of a final or sub-assembly.

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31 views

Can I include component supplier url in Altium Designer BOM file?

I'm new to Altium Designer and experimenting with a small pcb. Now that I've finished it I was considering ordering it at Seeed Studio and was curious about the posibilities to have it assemblied. I ...
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4answers
252 views

Best practice for wire harnesses in a BOM

Ive started a new job at a startup and am working on a BOM for a box build with a couple of PCBs and wire harnesses inside. Im in a bit of an impasse about how best to define wire harnesses in the BOM....
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46 views

Can't secure supply of 32mhz Automotive grade oscillator - why is this?

This is my first automotive PCB. I designed in a high temp crystal from Digikey. Stock then went to 0 with big lead times, and then my alternate went EOL. I then spun the board with a TCXO. All three ...
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2k views

How critical is it to declare the manufacturer part number for a component within the BOM?

I've never seen a BOM that explicitly declares manufacturer part numbers for the components (except the obvious ones, like a microcontroller) in any kind of circuit schematics. According to my ...
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1answer
64 views

2 devices with different CAN baud

I have a project where I need to talk with 2 devices x & y with 125kbps and 500kbps CAN speeds respectively. So I selected an MCU (F446RC) with 2 CAN controllers from ST. The BOM cost went up and ...
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1answer
1k views

Where to get a USB type E front panel motherboard header?

I'm designing a product that will need to have USB type C ports on its front panel, and due to physical constraints with the design, I would like to use a USB type E connector in conjunction with a ...
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2answers
111 views

What's the difference between µF and µFD?

A datasheet is referencing "CAP SMD0603 CERM 1.0UFD 16V 10% X7R ROHS" which is calling for a UFD. But I have a uF cap C1608X7R1C105K080AC which is "CAP CER 1UF 16V X7R 0603". Should that work fine? Is ...
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15 views

Application circuit G3NA-210B

Simple doubt about EMC directive on page 15. Should I use the varistor, cap and toroidal core on non UTU model? I want it to be compliant with safety directives, but I dont want to interfere with ...
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78 views

Determining Quantity from a BOM

I am new to electronic design (textbook taught hence practical experience limited), and upon reading the BOM of an EMI filter I noticed an asterisk *. Is this indicating that for CX1 there are eight ...
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1answer
117 views

Part number suffix meaning (,135 ,115)

When making a BOM I used a component which goes by part number BC847BW,135. It is available on Mouser and Digikey. An "alternative", is listed on Farnell: BC847BW,115 The datasheet doesn't seem to ...
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83 views

Diode package designator?

I received a job to add distributor part numbers to the existing BOM, which is a bit lacking in detail of description. One of the entries is 1N4148 diode with description: D3515. The other one is ...
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1answer
316 views

What kind of diode package/case is “case-17”?

The Russian company asked me to purchase several elements for the production of the device. Among the elements in the BOM there were two "5 watts" zener diodes 1N5342B at 6.8 Volts 1N5349B at 12 ...
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54 views

Altium how to remove 'ghost' ActiveBoM manufacturer link

While creating manufacturer links for a part in ActiveBoM I added the wrong part to the entry. Normally it's straight forward to remove either with right click or ...
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2answers
527 views

Handling DNP parts in ActiveBom in Altium Designer 19

I have another issue with ActiveBOM in Altium Designer 19, this time related to DNP ("do not populate") parts. For example, I have a bunch of 1k resistors in my design, some of which are not ...
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195 views

Value is a duplicate in Altium Designer BOM

I'm using ActiveBOM in Altium Designer 19. My design has 100k 5% resistors and also has 100k 1% resistors. ActiveBOM gives an informational warning (an "i" with a white circle around it) that the ...
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70 views

Can I use Bill of Materials to order components online? [closed]

I am working on a project in which I am designing a circuit board with a lot of components (resistors, capacitors, ICs etc) using AutoCAD Eagle. I am done with the schematic part and currently I am ...
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1answer
114 views

Managing BOMs in production management systems

I'm looking for a good way to manage BOMs for electronics assemblies in a production management system. I would really like to hear about how others manage BOMs in a professional setup. I'll start ...
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1answer
300 views

Component lifecycle management [closed]

What options are available for life cycle management and end of life (EOL) tracking of PCB components in a BOM. What are the main free and commercial services that are useful for this task. That is ...
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1answer
205 views

Designing for Low Cost China Manufacturing [closed]

I have designed a few boards on a consulting basis. Some of them have been manufactured in China in +10k unit volumes. One of the complains I have gotten from my clients is my boards can be a bit ...
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1answer
287 views

Altium Designer “NotFited” in BOM with DNP

I heve problem with Altium BOM document generation. I want have multi variants of one project with some DNP elements. It's no problem if I want remove elements from BOM, for this I can add variants ...
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1answer
134 views

Why do I get “Supplier Disabled” in my Altium BOM

I am trying to generate a BOM of my Altium project so that I can send it to the procurement people. However, strangely when I go into Reports > ...
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2answers
184 views

Passive Component ratings displayed on schematic - Use actual value or design requirement value?

When placing a passive component such as a cap or resistor on schematic, most people usually place the relevant rating (usually power for resistors, voltage for caps, and current for inductors) next ...
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1answer
99 views

Eagle Multilevel BOM

I want to do some BOM management in Eagle to make life more easy. I want to create a multilevel BOM out of Eagle.(Multiple MPN's for the same part from different suppliers) Is this possible to manage ...
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0answers
98 views

Building a device that lights an LED once a minute [closed]

I'm a complete noob in electronics. I want to build a simple battery-operated device that lights an LED for one second, once every minute. What do I need to buy to build it?
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3answers
229 views

Is it possible to PCBA without a Gerber file & BOM

I have a designer designing the Gerber and generating the BOM from a logic design.I have half the information like the circuit drawings and circuit working. He says he will complete the gerber and ...
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1answer
44 views

Preserve the input voltage range while reducing part count for a power supply

I have a design which uses a TPS40200 switching regulator that gives out 5V at 2A (max) by accepting input voltages anywhere between 8V to 40V. However, I now need the same 5V at not more than 800mA ...
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851 views

Altium Single Sheet BOM Generation

Apart from moving each sheet out of my Altium Project and generating a BOM for each of them, is there a way to generate a separate BOM for each Schematic Page in my Altium Project? Or alternatively, ...
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1answer
359 views

Quantity less than one on Altium BOM

There are some items that goes on the BOM that, in production, apear as 1 for many. Example: large card box to package 10 boards/products. These kinds of items apear on the BOM as less than one ...
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1answer
1k views

How to add manufacturer and supplier part numbers to components in Eagle?

I recently switched to Eagle for my board designs. Because most components I use are not in the predefined libraries, I've made a "Managed Library" myself. When making the BOM list (using a predefined ...
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1answer
1k views

Why does this schematic have a “Do Not Mount” component? Why not just remove it from the BOM and drawings? [duplicate]

While reviewing the reference design for the TI CC2541EM 2-layer board, and the associated parts list, I noticed one component (C254) states "DNM - Do Not Mount". What is the reason for this? Why ...
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2answers
877 views

Altium: Grouping “Not Fitted” Components In Excel BOM

I would like to include "Not Fitted" components on my Excel BOM exported from Altium. This part is easy, all I need to do is check the "Include Not Fitted Components" box in the "Source Options" panel ...
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6answers
1k views

MCU - Minimum list of external components

I can't find a complete answer for this anywhere, and I want to fill the gap in my knowledge of MCUs. In MCUs why do I need any other component except, maybe, a voltage regulator and an external ...
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1answer
641 views

Cheap alternative to an accelerometer [closed]

I am designing a very simple device, which absolutely needs to be inexpensive, total BOM cost < $1.00 including the MCU (at 10k+ units). This device would benefit from knowing its orientation, ...
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1answer
421 views

How can I tell Eagle to not export a 'part' to Bill of Materials?

I (as I believe many of you do too) have many parts that are not actually required for assembly but are on the schematic. (Some holes, logos, stamps, references, etc..). Whenever I export a BOM I ...
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1answer
309 views

Altium Schematic Library Ready for BOM

I have taken an old project from PCAD and loaded it into Altium and it works great. Now in the project the same footprint was used for each different component with the same footprint. For example, ...
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1answer
242 views

Estimating Assembly costs II

This is a continuation of Estimating Assembly Cost which has addressed some approximations in estimating between North American and Asian assembly houses as price per pin. The question does not ...
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1answer
274 views

What kind of patterns are used to mark a PCB?

I would like to create a pattern for my PCB. I would like to update the pattern with changes in BOM, external interface, software, changes in pads. I would like some suggestions of patterns used in ...
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2answers
574 views

What are some circuit design rules of thumb for mass production? [closed]

When I jump into a new design, if it's intended for mass production, I try to think how cheap I can make it. Are there any rules of thumb I should follow? Here are a couple items that I THINK are ...
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2answers
1k views

Altium : Bill of materials organization

Is there a way to get one component per line in the bill of material ? For example, currently I have two different designator who have same value and they share the same line. I would like to get one ...
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1answer
415 views

How can I set a custom form of my Bill of materials in Eagle

Actually I have made a schematic and I want to adopt the same format as in this file which was based on database because when I run bom.ulp I get only a such table :. I know that is something ...
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2answers
2k views

How to output Fiducials to Pick&Place but exclude them from BOM in Altium?

In Altium, the (not so) obvious way was to set the Fiducial component type to "Standard (No BOM)", but this also prevents them from showing up in the Pick&Place output. I could set the type so "...
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2answers
306 views

Reduce BOM Lines or reduce BOM cost? How to make production cheaper? [closed]

We are designing a product that will hopefully sell many thousand units, and now I am at the stage of specifying what parts to use. We require three inter-board connectors, one with 10contacts and ...
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3answers
2k views

What standards or conventions are there for BOM line items for non-refdes parts?

Some designs have parts that may lack a reference designator because they never appear on the schematic. Examples include: Battery holders PCB-mounted (soldered on) fasteners such as solder-nuts IC ...
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1answer
823 views

Altium — how to link multiple real parts to a library component for supplier live links?

I have an interesting use case for the Altium Supplier Live Links feature: I have several library components that I've made as one schematic component/footprint, but requires two real parts. An ...
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1answer
164 views

I need a quad NOR gate that is pinned out like a quad AND gate? Is there a good way to search for this?

So I have the footprint for a 2-input Quad AND gate (SN74LV08A) on a PCB. It is a 14-TSSOP and is pinned out like this: However, I want to change the logic to four NOR gates. The problem is, all of ...
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1answer
383 views

BOM/OPL parts help before PCB fab

I am completing my first official PCB project. I am outsourcing the PCB fab to Seeeed Studio. I was wondering if any of you might be able to shed some light on my issue. I am using their PCB ...
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1answer
214 views

Abstract Datasheet Dimension Notation

I am attempting to create a footprint for a Surface Mount Component and I am using the manufacturer's datasheet for reference. They include PCB dimensions but the notation used is a bit confusing. It ...
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1answer
2k views

LED as Zener: is this a good way to lower the BOM cost?

I had an old AM radio board designed to operate with a 3V CR2032 coin cell. I want to revitalize this old junk with as few parts as possible and convert it into a USB-powered AM radio with a built-in ...
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4answers
10k views

What exactly is a “Bill of Materials” (BoM)?

My understanding of a BoM is that it's essentially a list of the various components required for an electronic product or module. Does this mean it could be as simple as a spreadsheet? Are there any ...
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2answers
680 views

Why do TI (Texas Instruments) graphing calculators not use TI chips? [closed]

Most semiconductor manufacturers seem particular about using their own products when possible. For example, the Analog Devices Blackfin development board uses another Blackfin processor for the JTAG ...