Manual

• Max V: 5.5V
• Max I (measured): 1A
• Max I (sourced): 600mA

• < 50mA: ± 10% and ± 2% offset
• >= 50mA: ± 15% offset ± 5%

• Is it robust to output overcurrent or overvoltage?
• What does LED mean?

Suitable for high current, high or low side, measurement where isolation is needed. Noise limits low current performance.

• Hall effect
• Isolated: 450V rms working voltage or higher, depending on standard.
• ~100uR conductor
• 3.0 - 5.5V supply
• 120kHz
• 10mV noise typical, with 10nF output filter. Corresponds to 0.25A.
• +-35mV offset
• 2% typ total error
• Zero current output is half Vcc.

https://www.allegromicro.com/-/media/files/datasheets/acs758-datasheet.pdf

LCB-050B variant: +-50A, 40mV/A typ. Ratiometric though - I think that is 40mV at 5V and changes with Vcc.

There are higher current variants.

Purple Aliexpress module also has a TLC2272 opamp as a buffer after an RC filter. Sensor output is high impedance.

https://www.ti.com/lit/ds/symlink/tlc2272.pdf

• Opamp supply: +-2.2 to +-8V
• Input recommended max Vdd - 1.5. At 5V in, that is 3.5V.
• ACS758 will put out 4.5V with that supply and 50A measured.

This looks like an unsuitable choice of amp for general use.

Module pinout:

• Vcc: 3.3V or 5V ok. For 50A it wants to put out Vcc/2 + 2V, so will need at least 4V.
• Out1: Output of RC filter.
• Out 2: RC filter through buffer amp. Probably want to just use this one.