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27/08/2025 12:04 pm
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While preparing the PCB order, we encountered a couple of issues that we hope you can help us resolve:
- DC-DC Converter Replacement
We found that the DC-DC converter (U11 on Footprint P78E05-1000 by CUI Inc.) is obsolete and no longer available from any distributors. As potential replacements, we found the following options:
- Würth Elektronik – DC-DC Converter 5V 5W (Digikey Part #: 732-173010535-ND), which matches the specifications of the P78E05-1000 and has sufficient inventory.
- ReSine PS – RDK7805M-1000 (LCSC Part #: C22435259), which has similar specifications but limited availability.
Could you please advise on whether either of these alternatives would be suitable, or if you have other recommendations?
- Gain Resistors R13 and R15
We were unable to find matching parts for resistors R13 and R15 in the JLCPCB library. Could you kindly provide the specifications for these two resistors so we can identify compatible replacements?
2 Answers
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27/08/2025 12:30 pm
The P78E05-1000 DC-DC converter, based on the specs, can be used interchangeably with either of the replacement parts you mentioned:
- Würth Elektronik 173010535
- ReSine PS RDK7805M-1000
In addition, we recommend the following:
- Recom Power R-78K5.0-1.0
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27/08/2025 2:01 pm
For the 470-ohm resistors (R13 and R15), we used the following:
- YAGEO MFR1WSFTE52-470K
Other 470-ohm resistors with a similar form factor can also be used, including those with a lower power rating.
wuyang 17/10/2025 8:01 pm
@shanpu-fang Hello, the YAGEO resistor model MFR1WSFTE52-470K you mentioned is listed as a 470 kΩ resistor on Jialichuang, not a 470 Ω one. Additionally, the YAGEO website link you shared does not show this resistor. Finally, is the YAGEO MFR1WSFTE52-470K unavailable?
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