Investigate replacing the e-fuse with a toshiba part

tetrabiodistributed / papra-pcba

Printed Circuit Board Assembly (PCBA) for the PAPPRa m12 controller

Other

2 stars 2 forks source link

Investigate replacing the e-fuse with a toshiba part #67

Closed mmroden closed 1 year ago

mmroden commented 2 years ago

Efuses are hard to find, we need a replacement part. This ticket is an investigation for whether this part can replace the existing efuse.

https://www.digikey.co.uk/en/products/detail/toshiba-semiconductor-and-storage/TCKE800NL-RF/12324957

mechatroniks-git commented 2 years ago

Quick comparison of features:

TLDR:

Toshiba

Toshiba part will be easier to solder and should have less components required
Toshiba requires external MOSFET for reverse polarity protection

TI

TI part is cheaper and more featured
TI has adjustable Overvoltage, Toshiba has a fixed value @ 15.1V
TI has slightly lower on-resistance (less heat) - but still good
TI has status outputs
TI has better nuisance tripping resilience

mechatroniks-git commented 2 years ago

https://octopart.com/tcke812na%2Crf-toshiba-109207110?r=sp vs https://octopart.com/tps259472arpwr-texas+instruments-113046828?r=sp

mechatroniks-git commented 2 years ago

TI circuit:

Toshiba Circuit:

darraghbr commented 2 years ago

Just a couple of quick agenda items for the meeting.

What is the stock like for the transient suppression diodes and the external FET
Do we currently take advantage of the reverse polarity protection on the current board rev (I seem to recall that we do) and do we think that it is necessary to keep that functionality (I think it is)

mechatroniks-git commented 2 years ago

Reverse polarity is a good thing, certainly worth the $.31 per board.

These are the recommended parts, all made by Toshiba. Cost at 100 board qty. Lots of stock at the moment. TVS: Lots of stock, $0.20/board octopart SBD: Lots of stock, $0.22/board octopart FET: Lots of stock, $0.31/board octopart

darraghbr commented 2 years ago

https://www.digikey.com/en/products/detail/toshiba-semiconductor-and-storage/TCKE812NA-RF/12324959?s=N4IgTCBcDaICoGEDSBRAHARjAOQIIgF0BfIA

Updated digikey link for the correct over voltage and stock

mechatroniks-git commented 1 year ago

With Texas Instruments showing stock, request was made to order 250 parts for stock to avoid having to design in the Toshiba part.

Closing this issue for the time being.