Next question is which is the most junk yard available Nissan or else with this connector
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Re: microRusEfi
Posted: Mon Jun 10, 2019 2:22 am
by AndreyB
Junk yards here in the US do not have many 370Z but they do have many Sentras and Altimas. On Sentras and Altimas ECU harness used brown (keyed differently) version of the 48 pin only but transmission controller uses our 5007620481.
On 4 cylinder Sentra it's much easier to grab this pigtail, on 6 cylinder Altima engine bay is pretty packed. On both vehicles the connectors are exposed to elements and usually are pretty nasty
Fun fact: smaller Nissan crimped terminals/wires go into Chinese clone of the harness plug. Bigger crimped terminals thou do NOT go into harness side clones.
some of them burn after "higher" load, aprox 450-500mA .. or less
datasheet tell something about 800-1000mA ...
if you have "little bit" ripple input, then you have ripple output also ...
(but why ..??? it is voltage regulator .. or not .. ?? )
Re: microRusEfi
Posted: Thu Jun 27, 2019 6:21 pm
by mck1117
Using mystery Chinese parts will save maybe $3-5 per board. Absolutely not worth it for the risk of boards having issues.
This board dissipates 3-5 watts, and could be mounted somewhere that's already hot, like the engine bay, so it's going to get pretty toasty. The lm2937 is rated up to 125c - and I trust that rating from TI. That eBay one might have misbehavior that we may only see occasionally - but the 2937 is backed by TI that it will not, under the rated conditions, misbehave. For all we know, the $0.04 ones might be production rejects that went in the "trash" but found their way to eBay instead.
Re: microRusEfi
Posted: Thu Jun 27, 2019 6:21 pm
by mck1117
Also - that's our analog supply. Error and ripple on the output will directly affect accuracy of the analog inputs.
Yep, looks like not with the linear regulator. Gotcha.
Don't get me wrong - I'm totally cool with it for passives, but it gets iffy for silicon. It's pretty hard to screw up a resistor, but it's very easy to screw up an IC.
Re: microRusEfi
Posted: Thu Jun 27, 2019 8:58 pm
by mck1117
Even something like the TLV75533PDRVR, which is around 1/2 the cost and considerably smaller might be worth investigating. Looks like overall better performance than the LM2937, too. Even a regular LD1117 would work very well, and is only $0.20 at qty 100.