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Allegro MicroSystems ASEK724KMA-30AB-T-DK
- Part No.:
- ASEK724KMA-30AB-T-DK
- Manufacturer:
- Allegro MicroSystems
- Category:
- Sensor Evaluation Boards
- Package:
- Datasheet:
-
ASEK724KMA-30AB-T-DK.pdf
- Description:
- EVAL BOARD FOR ACS724KMA
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Product details
Overview
ASEK724KMA-30AB-T-DK from Allegro MicroSystems is a high-accuracy, bidirectional Hall-effect current sensor IC with ±30 A sensing range, 66 mV/A sensitivity, and 0.85 mΩ primary conductor resistance, designed for high-side or low-side AC/DC current monitoring in motor control and overcurrent protection circuits.
For engineers reviewing the ASEK724KMA-30AB-T-DK datasheet, ASEK724KMA-30AB-T-DK pinout, ASEK724KMA-30AB-T-DK application, or ASEK724KMA-30AB-T-DK equivalent, this device delivers UL62368-1 reinforced isolation (565 VRMS), differential common-mode field rejection (40 dB), and factory-trimmed ratiometric analog output - critical for precision power stage monitoring in industrial inverters and SMPS designs.
Technical Context
The ASEK724KMA-30AB-T-DK integrates a chopper-stabilized BiCMOS Hall IC with patented digital temperature compensation, enabling near closed-loop accuracy over –40°C to 125°C without external calibration. Its differential Hall sensing architecture rejects ambient magnetic interference, while the isolated copper conduction path (pins 1–4 and 5–8) provides galvanic separation between power and signal domains.
Internal filter circuitry (RF(INT) = 1.7 kΩ) interfaces with an external capacitor on the FILTER pin to adjust bandwidth from 120 kHz down to <18 kHz, optimizing noise performance versus response time. The device operates from a single 4.5–5.5 V supply and delivers a ratiometric VIOUT centered at 2.5 V (VCC × 0.5) at zero current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Range | ±30 A bidirectional sensing range supports full-scale motor phase current and DC link monitoring. |
| Sensitivity | 66 mV/A typical - enables direct ADC interfacing with 12-bit resolution at ±30 A full scale. |
| Total Output Error | ±0.8% at TA = 25°C–125°C - ensures stable measurement accuracy across thermal cycling in industrial environments. |
| Isolation Rating | Reinforced working voltage 565 VRMS per UL62368-1 - allows safe integration into 400 VAC systems without external isolation barriers. |
| Primary Resistance | 0.85 mΩ typical - limits power loss to ≤765 mW at 30 A, reducing thermal stress in compact PCB layouts. |
| Bandwidth | 120 kHz small-signal –3 dB - supports fast transient detection in overcurrent fault protection (<4 µs response time). |
| Supply Voltage | 4.5–5.5 V single supply - compatible with standard 5 V logic rails and immune to brownout in noisy power systems. |
Pinout & Package
ASEK724KMA-30AB-T-DK is housed in a high-isolation, low-profile SOIC16W package (suffix MA), with 8 mm creepage/clearance and 105 µm distance through insulation. The leadframe is 100% matte tin-plated for Pb-free assembly compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | IP+ | High-side input of isolated primary conduction path - connects to power rail or load side for high-side sensing. |
| 5, 6, 7, 8 | IP− | Low-side return of primary conduction path - completes current loop with minimal parasitic inductance (4 nH typical). |
| 9, 16 | NC | No internal connection; must remain unconnected to maintain 8 mm creepage for UL certification. |
| 10 | VCC | 5 V supply input - requires 0.1 µF bypass capacitor (CBYPASS) close to pin for stable operation. |
| 11, 14 | NC | No internal connection; recommended tied to GND for optimal ESD immunity. |
| 12 | VIOUT | Analog output (0.5×VCC ±15 mV offset) - ratiometric, drives 4.7 kΩ loads directly into MCU ADCs. |
| 13 | FILTER | External RC node - sets bandwidth with CF capacitor (e.g., 4.7 nF → ~18 kHz) to trade speed for noise reduction. |
| 15 | GND | Signal ground reference - must be star-connected to minimize ground bounce in high-dI/dt applications. |
Key Features
| Feature | Design Value |
|---|---|
| Differential Hall sensing | 40 dB common-mode field rejection - maintains ±0.8% accuracy in proximity to gate drivers or transformers. |
| Digital temperature compensation | Patented algorithm eliminates >95% of thermal drift - achieves near closed-loop performance without feedback winding. |
| UL62368-1 reinforced isolation | 565 VRMS working voltage - enables direct integration into Class I mains-connected equipment without optocouplers. |
| Low-conductor resistance | 0.85 mΩ typical - reduces self-heating to <1°C/W rise at 30 A, supporting continuous operation on 2-layer PCBs. |
| Ratiometric output | Output scales linearly with VCC - eliminates supply regulation dependency in systems with shared 5 V rails. |
Applications
| Motor Control | Switched-Mode Power Supply |
|---|---|
|
Use Scenario: Real-time phase current sampling in 3-phase BLDC inverter for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-side current sensor providing isolated, low-latency (4 µs response) feedback to PWM controller. Use Value: Enables precise torque regulation and stall detection without shunt resistor losses or isolation amplifiers. |
Use Scenario: Primary-side current monitoring in LLC resonant converter for overcurrent shutdown and soft-start control. IC Role / Device Role / Timing Role: Bidirectional sensing of AC magnetizing current and DC bias during startup and fault conditions. Use Value: Eliminates need for separate high-side and low-side sensing paths, reducing BOM count by one isolation amplifier. |
| Overcurrent Fault Protection | Load Detection & Management |
|
Use Scenario: Fast-acting trip signal generation in industrial servo drives during short-circuit events. IC Role / Device Role / Timing Role: Primary conductor senses up to 60 A peak; outputs analog voltage to comparator with <2 µs propagation delay. Use Value: Achieves sub-10 µs fault response - faster than discrete shunt + op-amp solutions - preventing IGBT destruction. |
Use Scenario: Real-time DC bus current tracking in battery-powered UPS systems for state-of-charge estimation. IC Role / Device Role / Timing Role: Low-drift (±1% total error) bidirectional sensor measuring charge/discharge cycles over temperature. Use Value: Extends runtime accuracy by eliminating cumulative offset drift seen in uncompensated Hall sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS724KMATR-30AB-T | Same die, tape-and-reel packaging (1000 pcs/reel); no evaluation board included. | Identical electrical specs and pinout; intended for volume production, not prototyping. | Select ASEK724KMA-30AB-T-DK when needing pre-mounted evaluation hardware; choose ACS724KMATR-30AB-T for manufacturing builds. |
| ACS725LLCTR-30AB-T | Higher bandwidth (240 kHz), lower noise (300 µARMS/√Hz), but no UL certification and 400 VRMS isolation only. | Suitable for non-safety-critical lab equipment or automotive subsystems where UL compliance is not mandated. | Choose ACS725LLCTR-30AB-T only if bandwidth >120 kHz is required and UL62368-1 is not needed; ASEK724KMA-30AB-T-DK remains preferred for certified industrial systems. |
Compared with ACS724KMATR-30AB-T, ASEK724KMA-30AB-T-DK adds an evaluation board for rapid validation; compared with ACS725LLCTR-30AB-T, it trades bandwidth for UL-certified reinforced isolation - making it the only option qualified for mains-connected safety-critical applications.
Availability
ASEK724KMA-30AB-T-DK is available at Aetrix Electronics and suitable for motor control, switched-mode power supplies, and overcurrent fault protection requiring stable component supply, traceable sourcing, and long-term lifecycle support.
Supply support for ASEK724KMA-30AB-T-DK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based semiconductor company specializing in magnetic sensing and power ICs, with design centers in New Hampshire and global manufacturing partnerships.
The ACS724 family was developed to deliver high-accuracy, isolated current sensing for industrial motor drives and energy-efficient power conversion - combining Hall-effect precision with system-level safety certifications.
FAQ
What is the primary current path configuration for ASEK724KMA-30AB-T-DK?
The ASEK724KMA-30AB-T-DK uses a fused copper conduction path with pins 1–4 as IP+ and pins 5–8 as IP−, enabling bidirectional ±30 A sensing. This path is electrically isolated from signal pins (9–16), allowing high-side placement without level-shifting circuitry. The 0.85 mΩ resistance minimizes insertion loss while supporting 60 A maximum continuous current at 25°C ambient.
Does ASEK724KMA-30AB-T-DK require external calibration for production use?
No. ASEK724KMA-30AB-T-DK is fully factory-trimmed for sensitivity and quiescent output voltage, with digital temperature compensation built into the die. Its ±0.8% total output error over –40°C to 125°C is guaranteed without user calibration, and the ratiometric output eliminates supply voltage dependency - making it ready for drop-in deployment in industrial control modules.
How does the FILTER pin affect ASEK724KMA-30AB-T-DK performance?
The FILTER pin on ASEK724KMA-30AB-T-DK forms an RC network with an external capacitor (e.g., 4.7 nF) to reduce bandwidth from 120 kHz to ~18 kHz, lowering input-referenced noise from 450 µARMS/√Hz to 60 mARMS. This improves measurement resolution in low-bandwidth applications like battery monitoring, while preserving <4 µs response time for fault detection when CF = 1 nF.
What safety certifications apply to ASEK724KMA-30AB-T-DK?
ASEK724KMA-30AB-T-DK is UL62368-1 certified (Certificate US-32210-M1-UL) with reinforced isolation rating of 565 VRMS working voltage and 4.8 kVRMS withstand voltage. It also carries TÜV America certification (U8V 16 03 54214 040) and meets IEC 61000-4-5 surge immunity (10 kV, 13 kA). These approvals validate its use in Class I mains-connected equipment without additional isolation components.
Can ASEK724KMA-30AB-T-DK be used in unidirectional current sensing applications?
Yes - though ASEK724KMA-30AB-T-DK is optimized for bidirectional ±30 A sensing with VIOUT(Q) = VCC × 0.5, it functions reliably in unidirectional mode (e.g., DC bus monitoring) by interpreting the full 0–5 V output swing. For dedicated unidirectional use, Allegro's ACS724KMATR-30AU-T offers 0–30 A range and VIOUT(Q) = VCC × 0.1, but ASEK724KMA-30AB-T-DK retains full accuracy and noise performance in either configuration.
ASEK724KMA-30AB-T-DK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- Sensor Type:
- Current Sensor
- Sensing Range:
- 30A
- Interface:
- Analog
- Sensitivity:
- 66mV/A
- Voltage - Supply:
- 4.5V ~ 5.5V
- Embedded:
- -
- Contents:
- Board(s)
- Utilized IC / Part:
- ACS724KMA
ASEK724KMA-30AB-T-DK FAQ
1.How can I place an order for ASEK724KMA-30AB-T-DK through Aetrix?
Please submit a Request for Quotation (RFQ) for ASEK724KMA-30AB-T-DK on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ASEK724KMA-30AB-T-DK reliable?
The price and inventory of ASEK724KMA-30AB-T-DK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ASEK724KMA-30AB-T-DK is usually 5 days.
3.What payment methods are accepted for ASEK724KMA-30AB-T-DK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ASEK724KMA-30AB-T-DK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ASEK724KMA-30AB-T-DK?
ASEK724KMA-30AB-T-DK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ASEK724KMA-30AB-T-DK order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ASEK724KMA-30AB-T-DK?
For technical support, including ASEK724KMA-30AB-T-DK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ASEK724KMA-30AB-T-DK requirements.
6.How does Aetrix verify that ASEK724KMA-30AB-T-DK is sourced from the original manufacturer or authorized distributors?
All ASEK724KMA-30AB-T-DK products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ASEK724KMA-30AB-T-DK meets industry standards.
7.What is the process for return or replacement of ASEK724KMA-30AB-T-DK?
All ASEK724KMA-30AB-T-DK units undergo pre-shipment inspection (PSI). If there is an issue with ASEK724KMA-30AB-T-DK, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ASEK724KMA-30AB-T-DK part is unused and in its original packaging.
Return procedure for ASEK724KMA-30AB-T-DK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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