ACS37610
High-precision current sensor for busbar mounting with ±200A range, 1MHz bandwidth, and 4.8kV isolation for EV applic...
Product Overview
Description
The ACS37610 is a high-precision, high-bandwidth current sensor designed for busbar mounting in high-current applications such as electric vehicle battery management and high-power motor drives. The sensor features Allegro's proprietary Hall-effect technology with advanced signal processing.
With a sensing range up to ±200A and 1MHz bandwidth, the ACS37610 can accurately measure both DC and high-frequency AC currents. The device provides 4.8kV isolation voltage, making it suitable for high-voltage EV battery packs up to 800V.
The sensor offers ±1% accuracy at 25°C with integrated temperature compensation maintaining accuracy across the automotive temperature range. The differential Hall sensing architecture rejects external magnetic fields, providing reliable measurements in noisy electromagnetic environments.
Product Series
ACS
Primary Application
EV/HEV battery management
Key Features
- High current range up to ±200A
- 1MHz bandwidth for high-frequency monitoring
- 4.8kV galvanic isolation
- Differential Hall sensing for noise immunity
- Integrated temperature compensation
- Busbar mounting for low thermal resistance
- Overcurrent detection output
- AEC-Q100 Grade 0 qualified
Specifications
| Current Range | ±50A to ±200A (configurable) |
|---|---|
| Bandwidth | 1MHz (-3dB) |
| Isolation Voltage | 4.8kV RMS |
| Accuracy | ±1% at 25°C, ±2% over temp |
| Response Time | 1μs typical |
| Output | Differential analog or PWM |
| Supply Voltage | 3.3V or 5V |
| Package | Custom busbar mount |
| Temperature Range | -40°C to +150°C |
Applications
EV/HEV battery management
Battery and charging management
High-power motor drives
Motor drive and control systems
Solar inverters
Renewable energy systems
DC fast chargers
Battery and charging management
Energy storage systems
Renewable energy systems
Industrial power supplies
Industrial automation and control
FAE Expert Insights
"The ACS37610 is my top recommendation for high-current EV applications. The 1MHz bandwidth is exceptional - I've used it to monitor SiC inverter switching with excellent results. The busbar mounting is a game-changer for thermal management; with proper copper area, we've measured < 50°C temperature rise at 200A continuous. The differential sensing really works - we saw < 1% error even with 1000A/cm external fields nearby. The 4.8kV isolation gives plenty of margin for 800V EV systems. One consideration is the custom footprint - you'll need to design your busbar specifically for this sensor. Also, the differential output requires a differential ADC or instrumentation amplifier, adding some complexity. But for high-current, high-voltage applications, the performance is unmatched. The AEC-Q100 Grade 0 qualification is essential for automotive. Overall, the best high-current sensor I've worked with."
1MHz bandwidth excellent for SiC inverters; busbar mounting provides superior thermal performance; differential sensing rejects external fields
— David Park, BeiLuo
Frequently Asked Questions
How do I mount the ACS37610 on a busbar?
The ACS37610 requires custom mechanical mounting on a busbar: 1) Design busbar with flat area for sensor mounting; 2) Ensure clean, flat surface for good thermal contact; 3) Use thermal interface material (TIM) between sensor and busbar; 4) Apply uniform mounting pressure using screws or clips; 5) Torque screws to specification (typically 0.5-1.0 Nm); 6) Ensure no air gaps for optimal heat transfer. Thermal design: The sensor dissipates P = I² × R_conductor (typically < 0.1mΩ). At 200A, P = 4W. With thermal resistance of 5°C/W (typical with good mounting), temperature rise is 20°C. Maintain ambient + rise < 150°C. PCB connections: Route sense and power connections away from high-current busbar. Use twisted pairs for differential output. Keep high-current paths short and wide. Allegro provides mechanical drawings and thermal simulation guidelines.
Use TIM for thermal contact; apply uniform pressure; ensure good thermal design for high-current operation.
What is the differential output of ACS37610?
The ACS37610 provides differential analog output for noise immunity: Vout_diff = Vout+ - Vout- = Sensitivity × I. The outputs are centered around common-mode voltage (typically Vcc/2). For ±200A range with 10mV/A sensitivity: At +200A: Vout+ = 2.5V + 1.0V = 3.5V, Vout- = 2.5V - 1.0V = 1.5V, Vdiff = 2.0V; At 0A: Vout+ = Vout- = 2.5V, Vdiff = 0V; At -200A: Vout+ = 1.5V, Vout- = 3.5V, Vdiff = -2.0V. Interface options: Differential ADC - connect Vout+ and Vout- directly to differential inputs; Single-ended ADC - use instrumentation amplifier (e.g., AD620) to convert differential to single-ended; Or sample both outputs separately and subtract in software. Differential signaling provides: Rejection of common-mode noise; Better EMI immunity; Longer cable runs possible. For best performance, route differential traces as twisted pair or closely coupled differential traces.
Use differential ADC or instrumentation amp; route as twisted pair; provides excellent noise immunity.
What is the overcurrent detection feature?
The ACS37610 includes a fast overcurrent detection (OCD) output: Function - digital output goes low when current exceeds programmed threshold; Response time - < 1μs from overcurrent to OCD output; Threshold - programmable via external resistor or digital interface; Hysteresis - prevents chatter near threshold; Use cases - fast fault protection for IGBTs/MOSFETs, short-circuit detection, current limiting. Configuration: Set threshold resistor Rth = (Vcc × Rint) / (Vth - Voffset), where Rint is internal reference, Vth is desired threshold voltage. Or program digitally via I2C/SPI if available. Connection: Connect OCD output to microcontroller interrupt or directly to gate driver shutdown. The OCD operates independently of the analog output, providing redundant protection. Example: For 150A overcurrent threshold with 10mV/A sensitivity: Vth = 150A × 10mV/A = 1.5V. Configure accordingly.
Program threshold based on protection requirements; < 1μs response for fast protection; use for gate driver shutdown.
Can ACS37610 measure high-frequency ripple current?
Yes, the ACS37610's 1MHz bandwidth enables high-frequency ripple current measurement: Capability - accurately measure ripple up to ~500kHz (Nyquist criterion); Applications - SiC/GaN inverter output monitoring, switching power supply ripple, motor drive current ripple; Measurement - the sensor captures both DC component and AC ripple; Output - analog output follows ripple waveform in real-time; For digital systems, sample at > 2× ripple frequency. Example: SiC inverter switching at 100kHz: The sensor captures the 100kHz switching ripple superimposed on DC current; With 1MHz bandwidth, amplitude error is minimal (< 3dB). For analysis: Use oscilloscope to view ripple waveform; Calculate ripple amplitude and RMS; Verify inverter operation and filter performance. The high bandwidth is a key advantage over lower-bandwidth sensors (80-120kHz) that would attenuate high-frequency components.
1MHz bandwidth captures ripple to 500kHz; ideal for SiC/GaN inverter monitoring; sample at > 2× ripple frequency.
What external magnetic field rejection does ACS37610 provide?
The ACS37610 uses differential Hall sensing for excellent external field rejection: Architecture - two Hall elements sense magnetic field from opposite sides of conductor; Common-mode rejection - external fields affect both sensors equally and cancel out; Rejection ratio - typically > 40dB (100:1) for uniform external fields; Performance - < 1% error with 1000A/cm external fields. Test conditions: Place sensor near high-current conductor (e.g., adjacent phase in 3-phase system); External field from adjacent conductor can be 100-500 Gauss; Differential sensing reduces error to < 1% of full scale. Limitations: Non-uniform fields (e.g., nearby magnet) may not cancel completely; Best practice - maintain distance from strong magnetic sources; Use magnetic shielding if necessary for extreme environments. The differential architecture is a significant advantage over single-element sensors for applications in high-field environments like motor drives and power converters.
Differential sensing provides > 40dB external field rejection; < 1% error in high-field environments; ideal for motor drives.