Product Overview
The Allegro ACS725 is an economical and precise automotive-grade current sensor IC designed for AC or DC current sensing in industrial, automotive, commercial, and communications systems. Its small SOIC8 package is ideal for space-constrained applications, offering cost savings through reduced board area. The device features differential Hall sensing for common-mode field rejection, a low-resistance primary conductor (1.2 m typical) for minimal power loss and high inrush current capability, and an integrated shield to suppress output noise from high dv/dt transients. With a high-bandwidth analog output of 120 kHz and patented digital temperature compensation, the ACS725 provides accurate, ratiometric voltage output proportional to the sensed current, enabling fast response times in control applications. It is AEC-Q100 qualified and offers galvanic isolation, making it suitable for high-side current sensing without external isolation components.
Product Attributes
- Brand: Allegro
- Product Family: ACS725
- Package Type: 8-Pin SOIC (LC)
- Certifications: AEC-Q100 qualified, CB Certificate Number: US-32848-UL, TV America Certificate Number: U8V 18 02 54214 041, CB 14 11 54214 031
- Material: Leadframe plated with 100% matte tin; internally Pb-free (except for flip-chip high-temperature Pb-based solder balls)
- Operating Temperature Range: -40C to 150C
- Isolation Voltage: 2400 VRMS (Production tested)
Technical Specifications
| Model | Current Sensing Range (IPR) | Sensitivity (Typ. at VCC = 3.3V) | Zero Current Output Voltage (VIOUT(Q)) | Total Output Error (Typ. at IPR(max), TA=25C to 150C) | Bandwidth (BW) | Primary Conductor Resistance (Typ.) |
|---|---|---|---|---|---|---|
| ACS725LLCTR-05AB-T | 5 A | 264 mV/A | VCC 0.5 (Bidirectional) | 0.9 % | 120 kHz | 1.2 m |
| ACS725LLCTR-10AB-T | 10 A | 132 mV/A | VCC 0.5 (Bidirectional) | 0.8 % | 120 kHz | 1.2 m |
| ACS725LLCTR-10AU-T | 0 - 10 A | 264 mV/A | VCC 0.1 (Unidirectional) | 0.9 % | 120 kHz | 1.2 m |
| ACS725LLCTR-20AB-T | 20 A | 66 mV/A | VCC 0.5 (Bidirectional) | 0.8 % | 120 kHz | 1.2 m |
| ACS725LLCTR-20AB-T-H | 20 A | 66 mV/A | VCC 0.5 (Bidirectional) | 0.7 % | 120 kHz | 1.2 m |
| ACS725LLCTR-20AU-T | 0 - 20 A | 132 mV/A | VCC 0.1 (Unidirectional) | 0.8 % | 120 kHz | 1.2 m |
| ACS725LLCTR-30AB-T | 30 A | 44 mV/A | VCC 0.5 (Bidirectional) | 0.7 % | 120 kHz | 1.2 m |
| ACS725LLCTR-30AB-T-H | 30 A | 44 mV/A | VCC 0.5 (Bidirectional) | 0.7 % | 120 kHz | 1.2 m |
| ACS725LLCTR-30AU-T | 0 - 30 A | 88 mV/A | VCC 0.1 (Unidirectional) | 0.8 % | 120 kHz | 1.2 m |
| ACS725LLCTR-40AB-T | 40 A | 33 mV/A | VCC 0.5 (Bidirectional) | 1 % | 120 kHz | 1.2 m |
| ACS725LLCTR-50AB-T | 50 A | 26.4 mV/A | VCC 0.5 (Bidirectional) | 1 % | 120 kHz | 1.2 m |
General Specifications:
| Characteristic | Symbol | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 3 | 3.3 | 3.6 | V | |
| Supply Current | ICC | VCC = 3.3 V, output open | 10 | 14 | mA | |
| Primary Conductor Resistance | RIP | TA = 25C | 1.2 | m | ||
| Common Mode Field Rejection Ratio | CMFRR | Uniform external magnetic field | 40 | dB | ||
| Rise Time | tr | IP = IPR(max), TA = 25C, CL = 1 nF | 3 | s | ||
| Response Time | tRESPONSE | IP = IPR(max), TA = 25C, CL = 1 nF | 4 | s | ||
| Bandwidth | BW | Small signal 3 dB; CL = 1 nF | 120 | kHz | ||
| Input referenced noise density | IND | TA = 25C, CL = 1 nF | 200 | A(rms)/Hz | ||
| Nonlinearity | ELIN | Through full range of IP | -1.5 | +1.5 | % | |
| Power-On Time | tPO | Output reaches 90% of steady-state level, TA = 25C, IP = IPR(max) applied | 80 | s |
Package Dimensions (mm):
| Dimension | Value (mm) |
|---|---|
| A | 3.90 0.10 |
| B | 6.00 0.20 |
| C | 1.27 BSC |
| Seating Plane Gauge Plane | 0.25 BSC |
| Lead Width | 0.40 |
| Lead Pitch | 1.27 |
| Package Height | 1.75 MAX |
| Package Width | 4.90 0.10 |
| Clearance (Dcl) | 4.2 mm |
| Creepage (Dcr) | 4.2 mm |
2504101957_ALLEGRO-ACS725LLCTR-05AB-T_C3684552.pdf
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