I ordered two units and both were 350 ohms and NOT 35 milli-ohms as they should be!
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This item: HiLetgo 2pcs MAX471 3A Current Sensor Module Consume Current Detection Module DC 0-3A
$8.99
Get it as soon as Thursday, Mar 20
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$6.98
Get it as soon as Thursday, Mar 20
In Stock
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$6.98
Get it as soon as Thursday, Mar 20
In Stock
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Low power drain, good accuracy... If you get good chips
UPDATE: 2021 JAN 28Contacted HiLetgo and they were very responsive! They agreed there is a problem and refunded my purchase and are looking into the problem.UPDATE: 2021 JAN 21Ordered 4 more of these for a specific project. The chip itself is now out of spec. The MAX 471 spec calls for a 35 milliOhm internal resistance across the current sense pins, which the original parts I purchased had. The parts in the latest batch have an internal resistance of ~350 Ohms. That's a factor of 1000x! The spec at Maxim Integrated's website says that the fabrication of this chip has been moved to a 3rd party foundry. The chips in use here now are either knock-offs or are from a bad batch where Quality Control didn't pay attention to their outgoing product.The problem parts all measure ~350 Ohms across the middle current sense pins. If you buy these, measure them out of the bag right away and send them back if the resistance is more than about 0.1 Ohms... about as low as a basic meter will really read.PRIOR REVIEW:The MAX471 has pretty good accuracy for measuring current at the 1-100 mA level. I have not tried it at higher levels. I have found that it's 1mV/1mA readout, measured with a Fluke, is within 1-2mA of a Rigol Digital supply feeding it. (Rigol DP832 with the enhanced accuracy feature added.) The MAX471 usually reads about 1mV higher than the corresponding reading on the Rigol.Used two of these to monitor power consumption on a device between solar panels and a battery. Easy to use, just crunch some numbers in your code or in Excel after collecting results to analyze your data.Low power drain from the MAX471 compared to some other power monitoring options.The sign pin for current flow direction seems to work fine when I'm testing it with meters.Seeing the older review From 2017 referencing a pull-up on the sign pin explains why something seemed wrong... I didn’t read the spec carefully enough!
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- Reviewed in the United States on August 6, 2019
UPDATE: 2021 JAN 28
Low power drain, good accuracy... If you get good chips
Reviewed in the United States on August 6, 2019
Contacted HiLetgo and they were very responsive! They agreed there is a problem and refunded my purchase and are looking into the problem.
UPDATE: 2021 JAN 21
Ordered 4 more of these for a specific project. The chip itself is now out of spec. The MAX 471 spec calls for a 35 milliOhm internal resistance across the current sense pins, which the original parts I purchased had. The parts in the latest batch have an internal resistance of ~350 Ohms. That's a factor of 1000x! The spec at Maxim Integrated's website says that the fabrication of this chip has been moved to a 3rd party foundry. The chips in use here now are either knock-offs or are from a bad batch where Quality Control didn't pay attention to their outgoing product.
The problem parts all measure ~350 Ohms across the middle current sense pins. If you buy these, measure them out of the bag right away and send them back if the resistance is more than about 0.1 Ohms... about as low as a basic meter will really read.
PRIOR REVIEW:
The MAX471 has pretty good accuracy for measuring current at the 1-100 mA level. I have not tried it at higher levels. I have found that it's 1mV/1mA readout, measured with a Fluke, is within 1-2mA of a Rigol Digital supply feeding it. (Rigol DP832 with the enhanced accuracy feature added.) The MAX471 usually reads about 1mV higher than the corresponding reading on the Rigol.
Used two of these to monitor power consumption on a device between solar panels and a battery. Easy to use, just crunch some numbers in your code or in Excel after collecting results to analyze your data.
Low power drain from the MAX471 compared to some other power monitoring options.
The sign pin for current flow direction seems to work fine when I'm testing it with meters.
Seeing the older review From 2017 referencing a pull-up on the sign pin explains why something seemed wrong... I didn’t read the spec carefully enough!
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