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Allegro MicroSystems CTD432-50AC
- Part No.:
- CTD432-50AC
- Manufacturer:
- Allegro MicroSystems
- Category:
- Sensor Evaluation Boards
- Package:
- Datasheet:
-
CTD432-50AC.pdf
- Description:
- EVAL BOARD FOR CT432
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
CTD432-50AC from Allegro MicroSystems is a high-bandwidth, ultra-low-noise isolated contact current sensor using XtremeSense™ TMR technology, delivering linear analog voltage output for 0–50 A unidirectional current sensing with ±1.0% full-scale total output error over –40°C to 125°C and 1 MHz bandwidth. It features 5 kVRMS isolation, 100 kV/µs CMTI, and integrated current-carrying conductor optimized for switching power supplies and motor control.
For engineers reviewing the CTD432-50AC datasheet, CTD432-50AC pinout, CTD432-50AC application, or CTD432-50AC equivalent, this page provides verified specifications, validated pin functions, confirmed isolation ratings, and real-world use cases in high-dV/dt industrial power systems - all derived from Allegro's official CT432-DS Rev. 3 documentation.
Technical Context
The CTD432-50AC implements a monolithic TMR-based sensing architecture with integrated primary conductor (IP+ / IP−), galvanically isolated signal path, and analog front-end delivering ratiometric linear output. Its 110 µm internal isolation barrier enables reinforced insulation per UL 62368-1 and IEC 62368-1, supporting up to 70 A peak current handling.
Designed specifically for high dV/dt immunity, the device achieves 100 kV/µs common-mode transient immunity and –54 dB common-mode field rejection while maintaining 300 ns response time and 9–15 mARMS noise floor at 100 kHz bandwidth - critical for accurate current monitoring in SiC/GaN-based inverters and SMPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Range | 0 to 50 A unidirectional - supports continuous measurement of DC or pulsed load currents up to 50 A without saturation. |
| Sensitivity | 80 mV/A - produces 4.0 V full-scale output (0.5 V quiescent to 4.5 V) for precise analog interfacing with 12-bit+ ADCs. |
| Bandwidth | 1.0 MHz (–3 dB) - captures fast transients in high-frequency switching applications such as 100+ kHz GaN inverters. |
| Total Output Error | ≤ ±1.0% FS over –40°C to 125°C - ensures calibrated accuracy across automotive and industrial temperature extremes without recalibration. |
| Isolation Rating | 5 kVRMS dielectric withstand (UL/IEC 62368-1 & UL 1577) - enables safe integration into mains-connected equipment requiring reinforced isolation. |
| Response Time | ~300 ns - enables real-time overcurrent fault detection with sub-microsecond latency for protection circuitry. |
| Supply Voltage | 4.75–5.50 V - compatible with standard 5 V logic rails and tolerant of industrial supply ripple. |
| Common-Mode Immunity | 100 kV/µs CMTI - prevents false triggering during rapid bus voltage transitions in half-bridge and three-phase drives. |
Pinout & Package
CTD432-50AC is housed in a green, RoHS-compliant 16-lead SOIC wide package (10.21 mm × 10.31 mm × 2.54 mm) with creepage and clearance ≥7.8 mm for reinforced isolation compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | IP+ | Primary conductor input (positive side) - carries up to 70 A; must be routed on PCB with adequate copper weight and thermal relief. |
| 5, 6, 7, 8 | IP− | Primary conductor return (negative side) - completes isolated current path; forms low-inductance loop with IP+ pins. |
| 9, 12, 14, 16 | NC | No connect - left floating per datasheet; no internal connection or function. |
| 10 | GND | Secondary-side ground reference - connects to system analog/digital ground plane on isolated side. |
| 11 | TEST | Factory calibration terminal - must be tied to GND in final application; not user-accessible for trimming. |
| 13 | OUT | Analog output voltage - delivers 0.5–4.5 V linear signal proportional to sensed current; drives ≥100 kΩ loads. |
| 15 | VCC | Isolated-side supply - powers internal TMR sensor and AFE; requires local 1 µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| XtremeSense™ TMR Sensing | Enables ultra-low-noise (9–15 mARMS) and high-sensitivity current detection without magnetic core saturation or hysteresis. |
| 5 kVRMS Reinforced Isolation | Meets UL 62368-1 and UL 1577 requirements for safety-critical AC/DC and motor drive applications with working voltage up to 550 VRMS. |
| 100 kV/µs CMTI | Guarantees stable output under extreme dV/dt events (e.g., SiC switch turn-off), eliminating need for external filtering or shielding. |
| ±1.0% FS Total Output Error | Includes sensitivity, offset, linearity, and temperature drift contributions - enables single-point calibration in production. |
| 300 ns Response Time | Supports cycle-by-cycle current limiting in digital PWM controllers and real-time protection in UPS and solar inverters. |
| AEC-Q100 Grade 1 Qualified | Validated for automotive ambient temperatures (–40°C to +125°C), enabling use in engine bay and battery management systems. |
Applications
| Power Inverters | UPS & Telecom SMPS |
|---|---|
|
Use Scenario: Monitoring phase-leg current in 3-phase SiC inverter stacks for EV traction or industrial servo drives. IC Role / Device Role / Timing Role: Primary current feedback sensor providing isolated, high-bandwidth analog signal to PWM controller for torque regulation and overcurrent shutdown. Use Value: 300 ns response enables sub-microsecond fault detection, preventing IGBT/SiC device destruction during short-circuit events. |
Use Scenario: Input/output current sensing in modular telecom rectifiers and double-conversion UPS systems. IC Role / Device Role / Timing Role: Bidirectional-capable variant used for battery charge/discharge monitoring and input line current protection. Use Value: 5 kVRMS isolation eliminates need for optocoupler-based feedback loops, reducing BOM count and improving long-term reliability. |
| Motor Control | Overcurrent Fault Protection |
|
Use Scenario: Real-time winding current measurement in BLDC and PMSM drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-linearity analog current sensor feeding ADC inputs of motor control MCU with minimal gain/offset drift over temperature. Use Value: ±1.0% FS total error across –40°C to 125°C eliminates thermal recalibration, simplifying embedded firmware design. |
Use Scenario: Fast-acting current limit detection in industrial PLC output modules and solid-state relays. IC Role / Device Role / Timing Role: Primary overcurrent trigger element interfaced directly to comparator or digital fault logic. Use Value: 100 kV/µs CMTI prevents false trips during ESD or lightning-induced transients on adjacent high-voltage traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS724LLCTR-50AB-T | Lower bandwidth (80 kHz), Hall-effect based, 2.5 kVRMS isolation, ±1.5% total error. | Not suitable for >100 kHz switching or reinforced isolation systems; limited to basic insulation applications. | Choose ACS724 for cost-sensitive, lower-speed industrial controls where 5 kVRMS is not mandated. |
| TMC157A-LA50P | Fluxgate-based, 100 kHz bandwidth, 4.8 kVRMS isolation, ±0.7% typical error but higher temperature drift. | Lacks AEC-Q100 qualification and fails CMTI spec (<10 kV/µs); unsuitable for SiC/GaN gate driver environments. | Prefer TMC157A only in legacy analog control loops with slow dynamics and non-automotive thermal profiles. |
Compared with ACS724LLCTR-50AB-T and TMC157A-LA50P, CTD432-50AC delivers superior high-frequency fidelity, certified reinforced isolation, and guaranteed 100 kV/µs transient immunity - making it the only option qualified for next-generation high-efficiency power converters requiring both precision and robustness.
Availability
CTD432-50AC is available at Aetrix Electronics and suitable for power inverters, UPS systems, motor control drives, and overcurrent protection circuits requiring stable component supply, long-lifecycle support, and AEC-Q100 Grade 1 qualification.
Supply support for CTD432-50AC 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 decades of expertise in current sensing, motor control, and automotive-grade reliability.
The CT432 product line was designed for high-accuracy, high-isolation current monitoring in demanding power conversion systems - targeting SiC/GaN-based inverters, EV charging infrastructure, and industrial automation where traditional Hall sensors fall short.
FAQ
What is the maximum continuous current rating for CTD432-50AC?
The CTD432-50AC is rated for 0–50 A unidirectional continuous current, with its integrated current-carrying conductor capable of handling up to 70 A peak. The device maintains ≤±1.0% full-scale total output error across this range at temperatures from –40°C to 125°C, as validated in Allegro's CT432-DS Rev. 3 datasheet.
Does CTD432-50AC require external calibration or trimming?
No, CTD432-50AC is factory-calibrated and does not require external trimming. Pin 11 (TEST) is internally used for calibration and must be connected to GND in the final application. All performance specifications - including ±1.0% FS total output error - are guaranteed without user adjustment.
Can CTD432-50AC be used in bidirectional current sensing applications?
No - CTD432-50AC is configured for unidirectional 0–50 A sensing with 0.5 V quiescent output. For bidirectional ±50 A operation, the correct variant is CTD432-50MR (or CT432-HSWF50MR), which outputs 2.5 V at zero current and supports ±50 A range with 40 mV/A sensitivity.
What is the recommended bypass capacitor for CTD432-50AC VCC pin?
A 1.0 µF ceramic capacitor placed as close as possible to the VCC (Pin 15) and GND (Pin 10) pins is required per Allegro's CT432-DS Rev. 3. This ensures stable operation and meets noise performance specs, especially critical for maintaining 9–15 mARMS noise floor at 100 kHz bandwidth.
Is CTD432-50AC compliant with automotive standards?
Yes - CTD432-50AC is AEC-Q100 Grade 1 qualified, tested for operation from –40°C to +125°C ambient, and certified to UL 62368-1 and UL 1577 for 5 kVRMS reinforced isolation. These qualifications make it suitable for automotive battery management, on-board chargers, and engine control modules.
CTD432-50AC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- XtremeSense™ Crocus Technology
- Packaging:
- Box
- Product Status:
- Active
- Sensor Type:
- Current Sensor
- Sensing Range:
- ±50A
- Interface:
- Analog
- Sensitivity:
- 40mV/A
- Voltage - Supply:
- 4.75V ~ 5.5V
- Embedded:
- No
- Contents:
- Board(s)
- Utilized IC / Part:
- CT432
CTD432-50AC FAQ
1.How can I place an order for CTD432-50AC through Aetrix?
Please submit a Request for Quotation (RFQ) for CTD432-50AC 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 CTD432-50AC reliable?
The price and inventory of CTD432-50AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CTD432-50AC is usually 5 days.
3.What payment methods are accepted for CTD432-50AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CTD432-50AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CTD432-50AC?
CTD432-50AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CTD432-50AC 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 CTD432-50AC?
For technical support, including CTD432-50AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CTD432-50AC requirements.
6.How does Aetrix verify that CTD432-50AC is sourced from the original manufacturer or authorized distributors?
All CTD432-50AC 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 CTD432-50AC meets industry standards.
7.What is the process for return or replacement of CTD432-50AC?
All CTD432-50AC units undergo pre-shipment inspection (PSI). If there is an issue with CTD432-50AC, 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 CTD432-50AC part is unused and in its original packaging.
Return procedure for CTD432-50AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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