Hello all, Lately it seems I keep accidentally ordering 0603 metric parts (0201) when I type something like '0.1 uF 0603' into a quick DigiKey search to look for part numbers to specify. I tend to catch a lot of them when I try to check all the received parts against my bill of materials, but even then some of them slip through the cracks and I invariably end up having a bit of back and forth with the board house to figure out how to address each line item with a discrepancy. Does anybody have any clever ways to catch that before actually placing orders for parts, or is it really a matter of just slowing down and being more careful? Specifying part numbers for every passive component line item is a bit of a drag, so I don't tend to take my time with it.
Ordering wrong parts for PCB assembly
Started by ●April 12, 2017
Reply by ●April 12, 20172017-04-12
On Wed, 12 Apr 2017 15:55:43 -0700, sbattazzo wrote:> Hello all, > > Lately it seems I keep accidentally ordering 0603 metric parts (0201) > when I type something like '0.1 uF 0603' into a quick DigiKey search to > look for part numbers to specify. I tend to catch a lot of them when I > try to check all the received parts against my bill of materials, but > even then some of them slip through the cracks and I invariably end up > having a bit of back and forth with the board house to figure out how to > address each line item with a discrepancy. > > Does anybody have any clever ways to catch that before actually placing > orders for parts, or is it really a matter of just slowing down and > being more careful? Specifying part numbers for every passive component > line item is a bit of a drag, so I don't tend to take my time with it.Partially I pick the package from a list. But mostly, most DigiKey part numbers for resistors and caps embed the value in the part number -- so if I already have a 1% 12.1K-ohm resistor and I need a 1% 49.9K-ohm, I just copy & paste the part number into the DigiKey search, edit the "12.1" to read "49.9", and make sure it exists at the new value. It speeds things up, keeps me with one product line for the whole board, and (incidentally) avoids your problem. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com I'm looking for work -- see my website!
Reply by ●April 13, 20172017-04-13
Den torsdag den 13. april 2017 kl. 01.29.21 UTC+2 skrev Tim Wescott:> On Wed, 12 Apr 2017 15:55:43 -0700, sbattazzo wrote: > > > Hello all, > > > > Lately it seems I keep accidentally ordering 0603 metric parts (0201) > > when I type something like '0.1 uF 0603' into a quick DigiKey search to > > look for part numbers to specify. I tend to catch a lot of them when I > > try to check all the received parts against my bill of materials, but > > even then some of them slip through the cracks and I invariably end up > > having a bit of back and forth with the board house to figure out how to > > address each line item with a discrepancy. > > > > Does anybody have any clever ways to catch that before actually placing > > orders for parts, or is it really a matter of just slowing down and > > being more careful? Specifying part numbers for every passive component > > line item is a bit of a drag, so I don't tend to take my time with it. > > Partially I pick the package from a list. But mostly, most DigiKey part > numbers for resistors and caps embed the value in the part number -- so > if I already have a 1% 12.1K-ohm resistor and I need a 1% 49.9K-ohm, I > just copy & paste the part number into the DigiKey search, edit the > "12.1" to read "49.9", and make sure it exists at the new value. > > It speeds things up, keeps me with one product line for the whole board, > and (incidentally) avoids your problem.or makes all the parts the wrong size :P
Reply by ●April 13, 20172017-04-13
On Thu, 13 Apr 2017 06:57:14 -0700, lasselangwadtchristensen wrote:> Den torsdag den 13. april 2017 kl. 01.29.21 UTC+2 skrev Tim Wescott: >> On Wed, 12 Apr 2017 15:55:43 -0700, sbattazzo wrote: >> >> > Hello all, >> > >> > Lately it seems I keep accidentally ordering 0603 metric parts (0201) >> > when I type something like '0.1 uF 0603' into a quick DigiKey search >> > to look for part numbers to specify. I tend to catch a lot of them >> > when I try to check all the received parts against my bill of >> > materials, but even then some of them slip through the cracks and I >> > invariably end up having a bit of back and forth with the board house >> > to figure out how to address each line item with a discrepancy. >> > >> > Does anybody have any clever ways to catch that before actually >> > placing orders for parts, or is it really a matter of just slowing >> > down and being more careful? Specifying part numbers for every >> > passive component line item is a bit of a drag, so I don't tend to >> > take my time with it. >> >> Partially I pick the package from a list. But mostly, most DigiKey >> part numbers for resistors and caps embed the value in the part number >> -- so if I already have a 1% 12.1K-ohm resistor and I need a 1% >> 49.9K-ohm, I just copy & paste the part number into the DigiKey search, >> edit the "12.1" to read "49.9", and make sure it exists at the new >> value. >> >> It speeds things up, keeps me with one product line for the whole >> board, >> and (incidentally) avoids your problem. > > or makes all the parts the wrong size :PBut at least consistent. -- Tim Wescott Control systems, embedded software and circuit design I'm looking for work! See my website if you're interested http://www.wescottdesign.com
Reply by ●April 17, 20172017-04-17
I have noticed that fact, and used it a little bit as a shortcut but sometimes it fails me because the number of significant digits can change the format depending on the values. It's a good point though so I will make a note of it! I'd love it if I could select just the ICs and do something turnkey for all the passives but I guess it's better for us that we keep track of what we're getting for all the parts. On Thursday, April 13, 2017 at 8:05:49 AM UTC-7, Tim Wescott wrote:> On Thu, 13 Apr 2017 06:57:14 -0700, lasselangwadtchristensen wrote: > > > Den torsdag den 13. april 2017 kl. 01.29.21 UTC+2 skrev Tim Wescott: > >> On Wed, 12 Apr 2017 15:55:43 -0700, sbattazzo wrote: > >> > >> > Hello all, > >> > > >> > Lately it seems I keep accidentally ordering 0603 metric parts (0201) > >> > when I type something like '0.1 uF 0603' into a quick DigiKey search > >> > to look for part numbers to specify. I tend to catch a lot of them > >> > when I try to check all the received parts against my bill of > >> > materials, but even then some of them slip through the cracks and I > >> > invariably end up having a bit of back and forth with the board house > >> > to figure out how to address each line item with a discrepancy. > >> > > >> > Does anybody have any clever ways to catch that before actually > >> > placing orders for parts, or is it really a matter of just slowing > >> > down and being more careful? Specifying part numbers for every > >> > passive component line item is a bit of a drag, so I don't tend to > >> > take my time with it. > >> > >> Partially I pick the package from a list. But mostly, most DigiKey > >> part numbers for resistors and caps embed the value in the part number > >> -- so if I already have a 1% 12.1K-ohm resistor and I need a 1% > >> 49.9K-ohm, I just copy & paste the part number into the DigiKey search, > >> edit the "12.1" to read "49.9", and make sure it exists at the new > >> value. > >> > >> It speeds things up, keeps me with one product line for the whole > >> board, > >> and (incidentally) avoids your problem. > > > > or makes all the parts the wrong size :P > > But at least consistent. > > -- > Tim Wescott > Control systems, embedded software and circuit design > I'm looking for work! See my website if you're interested > http://www.wescottdesign.com
Reply by ●June 2, 20172017-06-02
On 4/12/17 6:55 PM, sbattazzo@gmail.com wrote:> Hello all, > > Lately it seems I keep accidentally ordering 0603 metric parts (0201) when I type something like '0.1 uF 0603' into a quick DigiKey search to look for part numbers to specify. I tend to catch a lot of them when I try to check all the received parts against my bill of materials, but even then some of them slip through the cracks and I invariably end up having a bit of back and forth with the board house to figure out how to address each line item with a discrepancy. > > Does anybody have any clever ways to catch that before actually placing orders for parts, or is it really a matter of just slowing down and being more careful? Specifying part numbers for every passive component line item is a bit of a drag, so I don't tend to take my time with it. >The Description size/search is iffy as youu have seen. If you start by searching for all resistors, then choose the case size from the search parameter list, THAT will be consistent. Also, start with a particular line of resistors and get the manufactures number, and just change the value code in the number rather than looking up each part individually.
