Product Overview
The Allegro ACS37612 is a coreless, high-precision, Hall-effect current sensor IC designed for low-cost AC and DC current sensing solutions. It eliminates the need for external field concentrator cores or shields, making it ideal for applications where hundreds of amps flow through a busbar or PCB trace. The device features differential sensing topology for common-mode stray magnetic field rejection, high isolation, and a fast response time (<2 s typical) suitable for safety-critical overcurrent fault detection. With a wide ambient operating temperature range of 40C to 150C and AEC-Q100 Grade 0 automotive qualification, it is well-suited for harsh automotive environments and space-constrained applications due to its low-profile 8-pin TSSOP package. Available in 120 kHz and 240 kHz bandwidth options, it is ideal for inverter phase current sensing, load detection and management, power supplies, and DC/DC converters.
Product Attributes
- Brand: Allegro
- Package: 8-pin TSSOP (suffix LU)
- Certifications: AEC-Q100 Grade 0, automotive qualified
- Material: Lead (Pb) free, 100% matte tin leadframe plating
Technical Specifications
| Model / Feature | Nominal Supply Voltage (V) | Differential Magnetic Input Range (G) | Sensitivity (Typ.) (mV/G) | Bandwidth (kHz) | Ambient Temp. Range (C) | Packing |
|---|---|---|---|---|---|---|
| ACS37612LLUATR-010B3 | 3.3 | 135 | 10 | 120 | 40 to 150 | 4000 pieces per 13-inch reel |
| ACS37612LLUATR-005B5 | 5 | 400 | 5 | 120 | 40 to 150 | |
| ACS37612LLUATR-010B5 | 5 | 200 | 10 | 120 | 40 to 150 | |
| ACS37612LLUATR-010B5-C | 5 | 200 | 10 | 120 | 40 to 150 | |
| ACS37612LLUATR-015B5 | 5 | 130 | 15 | 120 | 40 to 150 | |
| ACS37612LLUATR-015U5 | 5 | 0 to 265 | 15 | 120 | 40 to 150 |
Key Features & Benefits
- Eliminates the need for a concentrator core or shield.
- Suitable for current flowing through busbars or PCB traces.
- Very wide sensing range (2.5 to 20 mV/G), ideal for currents from <200 A to >1000 A.
- Factory-programmed segmented linear temperature compensation for low thermal drift (Sensitivity 1% typ, Offset 3 mV typ).
- Differential Hall sensing rejects common-mode magnetic fields.
- High operating bandwidth: DC to 240 kHz.
- Contactless, lossless, non-invasive current sensing.
- Very fast response time (<2 s typ).
- 3.3 V or 5.0 V single supply operation.
- Ratiometric output with unidirectional and bidirectional modes.
- Immune to mechanical stress.
- Monolithic Hall IC for high reliability.
- Wide ambient temperature range: 40C to 150C.
- Surface mount, small footprint, low-profile TSSOP8 package.
Typical Applications
- High voltage traction motor inverters
- 48 V / 12 V auxiliary inverters
- Battery monitoring
- Overcurrent detection
- DC/DC converters
- Smart fuses
- Power distribution units (PDUs)
- Power supplies
Technical Data Summary
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Common Operating Characteristics | ||||||
| Supply Voltage (5 V variant) | VCC | 4.5 | 5 | 5.5 | V | |
| Supply Voltage (3.3 V variant) | VCC | 3 | 3.3 | 3.6 | V | |
| Supply Current | ICC | VCC(min) VCC VCC(max), no load | 12 | 16 | mA | |
| Power-On Time | tPO | TA = 25C | 70 | s | ||
| Internal Bandwidth (lowest) | BWi | CL = 1 nF, lowest bandwidth mode | 120 | kHz | ||
| Internal Bandwidth (highest) | BWi | CL = 1 nF, highest bandwidth mode | 240 | kHz | ||
| Response Time (120 kHz BW) | tRESPONSE | TA = 25C, CL = 1 nF | 3.2 | s | ||
| Response Time (240 kHz BW) | tRESPONSE | TA = 25C, CL = 1 nF | 1.6 | s | ||
| Common Mode Field Rejection Ratio | CMFRR | 100 G uniform magnetic field | 40 | dB | ||
| Accuracy Performance (Example: ACS37612LLUATR-005B5) | ||||||
| Differential Magnetic Range | BDIFF | 400 | 400 | G | ||
| Sensitivity | Sens | VCC(min) VCC VCC(max) | 5 | mV/G | ||
| Sensitivity Error | ESENS | TA = 25C | 2 | 1 | 2 | % |
| Sensitivity Drift Over Temp (25C to 150C) | SensTC | 2 | 1 | 2 | % | |
| Factory Quiescent Voltage Output Error | VOE | TA = 25C | 5 | 3 | 5 | mV |
| Quiescent Voltage Output Temp Error (25C to 150C) | VOUT(Q)TC | 5 | 3 | 5 | mV | |
| Accuracy Performance (Example: ACS37612LLUATR-010B3) | ||||||
| Differential Magnetic Range | BDIFF | 135 | 135 | G | ||
| Sensitivity | Sens | VCC(min) VCC VCC(max) | 10 | mV/G | ||
| Sensitivity Error | ESENS | TA = 25C | 2 | 1 | 2 | % |
| Sensitivity Drift Over Temp (25C to 150C) | SensTC | 2 | 1 | 2 | % | |
| Factory Quiescent Voltage Output Error | VOE | TA = 25C | 5 | 3 | 5 | mV |
| Quiescent Voltage Output Temp Error (25C to 150C) | VOUT(Q)TC | 10 | 3 | 10 | mV | |
2401220953_ALLEGRO-ACS37612LLUATR-015U5_C19761992.pdf
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