Product Overview
The Allegro ACS37612 is a coreless, high-precision Hall-effect current sensor IC designed for low-cost AC and DC current sensing in applications handling hundreds of amps. It eliminates the need for external field concentrator cores or shields, sensing current flowing through a busbar or PCB trace. The differential sensing topology ensures high accuracy by rejecting common-mode stray magnetic fields. With high isolation achieved through its contactless nature, the ACS37612 offers bandwidth options of 120 kHz and 240 kHz, making it ideal for demanding applications like inverter phase current sensing, load detection, power supplies, and DC/DC converters. Its fast response time enables critical overcurrent fault detection. Designed for harsh automotive environments, it features a wide ambient operating temperature range (40C to 150C) and a stellar ESD rating. The compact, low-profile 8-pin TSSOP package is suitable for space-constrained designs.
Product Attributes
- Brand: Allegro MicroSystems
- Package: 8-pin TSSOP (suffix LU)
- Lead Plating: 100% matte tin
- Certifications: AEC-Q100 Grade 0, automotive qualified
- Material: Lead (Pb) free
Technical Specifications
| Model | Nominal Supply Voltage (V) | Differential Magnetic Input Range (G) | Sensitivity (Typ.) (mV/G) | Bandwidth (kHz) | Ambient Temperature (C) | Packing |
|---|---|---|---|---|---|---|
| ACS37612LLUATR-010B3 | 3.3 | 135 | 10 | 120 | 40 to 150 | 4000 pieces per 13-inch reel |
| ACS37612LLUATR-005B5 | 5 | 400 | 5 | 240 (Default) | 40 to 150 | |
| ACS37612LLUATR-010B5 | 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
- Eliminates the need for a concentrator core or shield.
- Suitable for applications where current flows through a busbar or PCB.
- 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 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 inverter
- 48 V / 12 V auxiliary inverter
- Battery monitoring
- Overcurrent detection
- DC/DC converter
- Smart fuse
- Power distribution unit (PDU)
- Power supply
Electrical Characteristics (Summary)
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage (5V variant) | VCC | 4.5 | 5 | 5.5 | V | |
| Supply Voltage (3.3V variant) | VCC | 3 | 3.3 | 3.6 | V | |
| Supply Current | ICC | VCC = 5 V or 3.3 V, no load | 12 | 16 | mA | |
| Power-On Time | tPO | TA = 25C | 70 | s | ||
| Internal Bandwidth (lowest) | BWi | CL = 1 nF, default mode | 120 | kHz | ||
| Internal Bandwidth (highest) | BWi | CL = 1 nF, highest mode | 240 | kHz | ||
| Response Time (BW=240kHz) | tRESPONSE | TA = 25C, CL = 1 nF | 1.6 | s | ||
| Response Time (BW=120kHz) | tRESPONSE | TA = 25C, CL = 1 nF | 3.2 | s | ||
| Ambient Operating Temperature | TA | 40 | 150 | C |
2304140030_ALLEGRO-ACS37612LLUALU-015B5_C1869996.pdf
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