Product Overview
The Allegro ACS725KMA is a highly accurate, Hall-effect-based current sensor IC designed for AC or DC current sensing in industrial, commercial, and communication systems. Its compact SOIC16 package is ideal for space-constrained applications, offering cost savings through reduced board area. The sensor features differential Hall sensing for common-mode field rejection, improving accuracy in noisy environments. It incorporates Allegro's patented digital temperature compensation for exceptional accuracy over temperature. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device provides a low-loss, 0.85 m typical internal resistance and high isolation, allowing for high-side current sensing without costly isolation techniques.
Product Attributes
- Brand: Allegro
- Package Type: 16-pin SOICW (suffix MA)
- Certifications: UL60950-1 (ed. 2) certified, CB Certificate Number: US-32210-M1-UL, TV America Certificate Number: U8V 16 03 54214 040, CB 16 03 54214 039
- Leadframe Material: 100% matte tin
- Internal Construction: Pb-free
Technical Specifications
| Model | IPR (A) | Sens (Typ) at VCC = 3.3 V (mV/A) | TA (C) | Packing |
| ACS725KMATR-20AB-T | 20 | 66 | 40 to 125 | Tape and Reel, 1000 pieces per reel |
| ACS725KMATR-30AB-T | 30 | 44 | 40 to 125 | Tape and Reel |
| ACS725KMATR-30AU-T | 0 30 | 88 | 40 to 125 | Tape and Reel |
| Characteristic | Symbol | Notes | Rating | Unit |
| Dielectric Surge Strength Test Voltage | VSURGE | Tested 5 pulses at 2/minute in compliance to IEC 61000-4-5 1.2 s (rise) / 50 s (width). | 10000 | V |
| Dielectric Strength Test Voltage | VISO | Agency type-tested for 60 seconds per UL 60950-1 (edition 2). Production tested at 3000 VRMS for 1 second, in accordance with UL 60950-1 (edition 2). | 4800 | VRMS |
| Working Voltage for Basic Isolation | VWVBI | Maximum approved working voltage for basic (single) isolation according to UL 60950-1 (edition 2). | 1097 | VRMS or VDC |
| Working Voltage for Reinforced Isolation | VWVRI | Maximum approved working voltage for reinforced isolation according to UL 60950-1 (edition 2). | 565 | VRMS or VDC |
| Clearance | Dcl | Minimum distance through air from IP leads to signal leads. | 7.5 | mm |
| Creepage | Dcr | Minimum distance along package body from IP leads to signal leads | 8.2 | mm |
| Distance Through Insulation | DTI | Minimum internal distance through insulation | 90 | m |
| Comparative Tracking Index | CTI | Material Group II | 400 to 599 | V |
| Supply Voltage | VCC | | 3 to 3.6 | V |
| Supply Current | ICC | VCC within VCC(min) and VCC(max) | 10 to 14 | mA |
| Primary Conductor Resistance | RIP | TA = 25C | 0.85 | m |
| Common Mode Field Rejection Ratio | CMFRR | Uniform external magnetic field | 40 | dB |
| Internal Bandwidth | BW | Small signal 3 dB, CL = 1 nF | 120 | kHz |
| Noise Density | IND | Input-referenced noise density; TA = 25C, CL = 1 nF | 618 | ARMS/Hz |
| Nonlinearity | ELIN | Through full range of IP | 1 | % |
| Power-On Time | tPO | Output reaches 90% of steady-state level, TA = 25C, IP = IPR(max) applied | 80 | s |
| Characteristic | Test Conditions | Min. | Typ. | Max. | Unit |
| Total Output Error | IP = IPR(max), TA = 25C to 125C | -2.5 | 1 | 2.5 | % |
| IP = IPR(max), TA = 40C to 25C | | 3 | | % |
| IP = IPR(max), TA = 25C to 125C (ACS725KMATR-30AU-T) | -2.5 | 1.25 | 2.5 | % |
| Sensitivity Error | TA = 25C to 125C, measured at IP = IPR(max) | -2 | 1 | 2 | % |
| TA = 40C to 25C, measured at IP = IPR(max) | | 2.5 | | % |
| Offset Voltage | IP = 0 A, TA = 25C to 125C | -15 | 6 | 15 | mV |
| IP = 0 A, TA = 40C to 25C | | 17 | | mV |
| Characteristic | Notes | Rating | Unit |
| Supply Voltage | VCC | 3 to 3.6 | V |
| Supply Current | ICC | 10 to 14 | mA |
| Primary Conductor Resistance | RIP, TA = 25C | 0.85 | m |
| Internal Bandwidth | BW, Small signal 3 dB, CL = 1 nF | 120 | kHz |
| Noise Density | IND, Input-referenced noise density; TA = 25C, CL = 1 nF | 618 | ARMS/Hz |
| Nonlinearity | ELIN, Through full range of IP | 1 | % |
| Power-On Time | tPO, Output reaches 90% of steady-state value, TA = 25C, IP = IPR(max) applied | 80 | s |
