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 offers high isolation, differential sensing for common-mode field rejection, and high operating bandwidths of up to 240 kHz. Its robust design, including a wide ambient operating temperature range (40C to 150C) and excellent ESD rating, makes it suitable for harsh automotive environments. The ACS37612 is available in a low-profile 8-pin TSSOP package, ideal for space-constrained applications. Key applications include inverter phase current sensing, load detection and management, power supplies, and DC/DC converters, with a fast response time enabling overcurrent fault detection in safety-critical systems.
Product Attributes
- Brand: Allegro
- Package Type: 8-pin TSSOP (suffix LU)
- Lead Plating: 100% matte tin
- Certifications: AEC-Q100 Grade 0, automotive qualified
- Material: Lead (Pb) free
Technical Specifications
| Model/Part Number | 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 | 40 to 150 | 4000 pieces per 13-inch reel |
| ACS37612LLUATR-010B5 | 5 | 200 | 10 | 120 or 240 | 40 to 150 | 4000 pieces per 13-inch reel |
| ACS37612LLUATR-015B5 | 5 | 130 | 15 | 120 or 240 | 40 to 150 | 4000 pieces per 13-inch reel |
| ACS37612LLUATR-015U5 | 5 | 0 to 265 | 15 | 120 or 240 | 40 to 150 | 4000 pieces per 13-inch reel |
Key Features
- Eliminates need for concentrator core or shield
- Suited for applications where current flows through busbar or PCB
- Very wide sensing range (2.5 to 20 mV/G)
- Ideal for sensing currents from <200 A to >1000 A
- Factory-programmed segmented linear temperature compensation (TC) provides 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 (Selected)
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage (5 V nominal) | VCC | 4.5 | 5 | 5.5 | V | |
| Supply Voltage (3.3 V nominal) | 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 = 240 kHz) | tRESPONSE | TA = 25C, CL = 1 nF | 1.6 | s | ||
| Response Time (BW = 120 kHz) | tRESPONSE | TA = 25C, CL = 1 nF | 3.2 | s |
Accuracy Performance (Example: ACS37612LLUATR-005B5)
| Characteristic | Symbol | Test Conditions | Min. | Typ. [1] | Max. | Unit |
|---|---|---|---|---|---|---|
| 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 Temperature | SensTC | TA = 25C to 150C | 2 | 1 | 2 | % |
| Factory Quiescent Voltage Output Error | VOE | TA = 25C | 5 | 3 | 5 | mV |
Package Outline
Package: 8-pin TSSOP (suffix LU)
Dimensions in millimeters:
- Body: 6.40 BSC
- Width: 4.40 0.10
- Length: 3.00 0.10
- Pitch: 0.65 BSC
- Height: 1.10 MAX
2304140030_ALLEGRO-ACS37612LLUALU-010B5_C1869998.pdf
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