If you look at the part numbers for Current Sensor ICs from Allegro MicroSystems, you might see a packaging code in the ordering part number, such as ACS732KLATR-40AB-T. “LA” is the packaging code, which refers to 16-Pin SOICW.
Here is the table for comparison of those packaging information.
| Package Descriptor | SOICW-16 (LA) | SOICW-16 (MA) | SOICW-16 (MC) | SOIC-8 (LC1) | SOIC-8 (LC2) | QFN-12 (EXB) | 7-pin PSOF (LR) | 5-pin (CB) |
|---|---|---|---|---|---|---|---|---|
| Dimension | 10.3x10.3mm | 10.3x10.3mm | 11.3x13mm | 4.9x6mm | 4.9x6mm | 3x3mm | 6.4x6.4mm | 14x22mm |
| Conductor Resistance | 0.85 mΩ | 0.85 mΩ | 0.27 mΩ | 1.2 mΩ | 0.65 mΩ | 0.6 mΩ | 0.2 mΩ | 0.1 mΩ |
| Dielectric Strength | RMS3600 V | RMS5000 V | RMS5000 V | RMS2400 V | RMS2400 V | NA | NA | RMS4800 V |
| Working Voltage | DC870 V / RMS616 V | DC1550V / RMS1097 V | DC1618 V / RMS1144 V | DC420 V / RMS297 V | DC420 V / RMS297 V | DC100 V / RMS70 V | DC100 V / RMS70 V | DC1358 V / RMS700 V |
For the three SOIC16 offered by manufacturer – LA/MA/MC, which all call out 16SOIC, Below is the difference for these.
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LA has the highest sensitivity with the Hall element closest to the conductor. Fill-chip locates top of die closest to the leadframe.
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MA has high internal isolation . 2 layers of polyimide insulation and 3 layers of insulating adhesive.
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MC has the lowest internal conductor resistance. Longer creepage for better working voltage.