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Allegro MicroSystems CTD416-65AC
- Part No.:
- CTD416-65AC
- Manufacturer:
- Allegro MicroSystems
- Category:
- Sensor Evaluation Boards
- Package:
- Datasheet:
-
CTD416-65AC.pdf
- Description:
- EVAL BOARD FOR CT416
- Quantity:
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- Shipping:
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Product details
Overview
CTD416-65AC from Allegro MicroSystems is a high-bandwidth, ultra-low-noise integrated contact current sensor using XtremeSense™ TMR technology. It features an integrated current-carrying conductor (CCC) rated for 0–65 A, delivers linear analog output voltage with ±3.0% full-scale total output error, 1 MHz bandwidth, and ~300 ns response time. It is used in solar inverters, UPS/SMPS power supplies, motor control, and overcurrent protection circuits requiring reinforced isolation.
For engineers reviewing the CTD416-65AC datasheet, CTD416-65AC pinout, CTD416-65AC application, or CTD416-65AC equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The CTD416-65AC implements a monolithic TMR-based magnetic sensing architecture with integrated CCC, analog front-end (AFE), and filtered linear voltage output. Its 1 MHz small-signal bandwidth and ~300 ns response time are enabled by low-noise amplifier design and optimized signal path timing.
It achieves reinforced isolation per UL/IEC 62368-1 (2.5 kVRMS dielectric withstand, 280 VRMS working voltage) and operates across –40°C to +125°C with AEC-Q100 Grade 1 qualification. The FILTER pin enables external RC filtering to reduce noise without compromising core bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Current Range | 0 to 65 A unidirectional - supports high-side or low-side DC current monitoring in power converters without external shunt or PCB trace redesign. |
| Output Accuracy | ±3.0% full-scale total output error - ensures reliable overcurrent detection and closed-loop control within industrial and automotive thermal margins. |
| Bandwidth | 1.0 MHz - captures fast transients in motor phase currents or inverter switching events without aliasing or phase lag. |
| Response Time | ~300 ns - enables real-time fault detection and cycle-by-cycle current limiting in SiC/GaN-based power stages. |
| Supply Voltage | 3.0–3.6 V - compatible with modern low-voltage microcontroller I/O domains and reduces system-level power rail complexity. |
| Noise Performance | 11.5 mARMS @ 100 kHz - enables precise current measurement in noisy EMI environments such as EV traction inverters or industrial drives. |
| Isolation Rating | 2.5 kVRMS dielectric withstand, 280 VRMS reinforced working voltage - meets safety requirements for mains-connected equipment and battery systems up to 400 VDC. |
Pinout & Package
The CTD416-65AC is housed in an industry-standard 8-lead SOIC package (4.89 mm × 6.00 mm × 1.62 mm), green and RoHS compliant, with creepage and clearance ≥4 mm for reinforced isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | IP+ | Positive terminal of integrated primary current conductor - carries up to 65 A; must be routed with appropriate copper weight and thermal relief. |
| 3, 4 | IP− | Negative terminal of integrated primary current conductor - completes current loop; symmetric layout required for field immunity. |
| 5 | GND | Analog ground reference for internal AFE and output stage - requires low-impedance connection to system power plane. |
| 6 | FILTER | External RC filter node - connects to capacitor (e.g., 1–100 pF) to set cutoff frequency and suppress high-frequency noise on OUT. |
| 7 | OUT | Linear analog output voltage (0.65–2.65 V) proportional to sensed current - directly interfaces with ADCs or comparators without signal conditioning. |
| 8 | VCC | 3.0–3.6 V supply input - requires local 1.0 µF X5R bypass capacitor (CBYP) placed ≤2 mm from pin per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| XtremeSense™ TMR Sensing | Enables <1.0% FS total error at 25°C and ±3.0% FS over temperature - eliminates need for factory calibration in end-equipment production lines. |
| Integrated Current-Carrying Conductor | Supports 0–65 A unidirectional current with 1 mΩ resistance - removes external shunt resistor, associated power loss, and PCB space. |
| Reinforced Isolation | UL/IEC 62368-1 certified (2.5 kVRMS, 280 VRMS working voltage) - satisfies safety requirements for Class I and II AC/DC power systems without optocoupler or transformer isolation. |
| Filter Pin (FILTER) | Allows user-defined noise suppression via external capacitor - preserves 1 MHz bandwidth while reducing broadband noise in high-EMI applications like motor drives. |
| AEC-Q100 Grade 1 | Qualified for automotive ambient temperatures (–40°C to +125°C) - enables use in engine bay, battery management, and onboard charger modules without derating. |
Applications
| Solar/Power Inverters | UPS & Telecom Power Supplies |
|---|---|
Use Scenario: Monitoring DC-link or AC-phase current in string inverters and microinverters operating at >100 kHz switching frequencies. IC Role / Device Role / Timing Role: High-speed current feedback sensor for MPPT control and anti-islanding protection with sub-microsecond response. Use Value: Enables accurate current reconstruction at 1 MHz bandwidth, supporting SiC MOSFET switching without signal distortion or delay-induced instability. |
Use Scenario: Input/output current sensing in modular UPS units and telecom rectifiers where galvanic isolation and long-term stability are critical. IC Role / Device Role / Timing Role: Reinforced-isolated analog current monitor replacing optocoupler-based solutions in secondary-side feedback loops. Use Value: Eliminates optocoupler aging drift and provides ±3.0% FS accuracy over 10+ years - improves system reliability and reduces recalibration cycles. |
| Motor Control | Overcurrent Fault Protection |
Use Scenario: Phase current sensing in BLDC and PMSM drives for field-oriented control (FOC) in industrial automation and EV traction systems. IC Role / Device Role / Timing Role: Low-latency current measurement node feeding real-time PWM modulation logic with <300 ns propagation delay. Use Value: Supports cycle-by-cycle current limiting at >50 kHz PWM rates - prevents IGBT/SiC device destruction during short-circuit events. |
Use Scenario: Fast-trip current monitoring in battery protection ICs, circuit breakers, and energy storage systems requiring <1 µs fault detection. IC Role / Device Role / Timing Role: Primary current sense element triggering hardware-based shutdown before thermal runaway occurs. Use Value: Delivers 300 ns response time and 11.5 mARMS noise floor - reduces false trips while enabling detection of sub-cycle overcurrent events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar contact current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CT417-HSN865MR | Same 0–65 A range, improved ±2.3% FS total error (drift-included), lower 15.4 mV/A sensitivity, same 8-lead SOIC package. | Designed for new designs only; replaces CT416-65AC in next-generation automotive and industrial systems requiring extended lifetime accuracy. | Select CT417-HSN865MR for new designs needing longer-term stability and lower total drift; not suitable for legacy CT416 footprint reuse without validation. |
| ACS724LLCTR-65AB-T | 65 A bidirectional Hall-effect sensor, ±1.5% typical error, 400 kHz bandwidth, 5 V supply, SOIC-8 package. | Lacks reinforced isolation (only basic 2.4 kVRMS), higher noise (20 mARMS), and slower response (~3 µs) - limited to non-safety-critical applications. | Use ACS724LLCTR-65AB-T only in cost-sensitive, non-certified systems where UL/IEC 62368-1 compliance is not required and bandwidth demands are ≤400 kHz. |
Compared with CTD416-65AC, CT417-HSN865MR offers superior long-term accuracy and is designated for new designs, while ACS724LLCTR-65AB-T provides lower-cost Hall-based sensing but lacks reinforced isolation and sub-microsecond response - making CTD416-65AC the only option meeting both safety and speed requirements in certified high-power systems.
Availability
CTD416-65AC is available at Aetrix Electronics and suitable for solar inverters, UPS/SMPS power supplies, and motor control systems requiring stable component supply amid ongoing product transition planning.
Supply support for CTD416-65AC 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, power ICs, and precision motion control solutions for automotive, industrial, and consumer markets.
The CT416 family was designed to deliver high-accuracy, isolated current sensing using proprietary XtremeSense™ TMR technology - targeting applications demanding low noise, fast response, and regulatory-compliant isolation without external components.
FAQ
What is the maximum continuous current rating for CTD416-65AC?
The CTD416-65AC is rated for 0 to 65 A continuous unidirectional current through its integrated current-carrying conductor (CCC). Absolute maximum current is 70 A at 25°C ambient, per absolute ratings. Derating applies above 25°C per thermal characteristics in the datasheet. CTD416-65AC maintains ±3.0% full-scale accuracy across this range under recommended operating conditions.
Does CTD416-65AC support bidirectional current measurement?
No, CTD416-65AC is configured for unidirectional (0–65 A) current sensing only. Its quiescent output voltage (VOQ) is 0.65 V, and output spans 0.65–2.65 V linearly with current. For bidirectional operation, Allegro offers the CT416-ASN865MR variant (±65 A, VOQ = 1.65 V), which shares the same package and pinout but differs in internal calibration and output offset.
What isolation certifications apply to CTD416-65AC?
CTD416-65AC is certified to UL/IEC 62368-1 (edition 2) and UL 1577, with 2.5 kVRMS dielectric withstand voltage and 280 VRMS working voltage for reinforced isolation. It also meets creepage and clearance requirements (≥4 mm) and has a Comparative Tracking Index (CTI) of 400–599 V (Material Group II).
How does the FILTER pin function in CTD416-65AC?
The FILTER pin on CTD416-65AC connects to an external capacitor to form a first-order RC low-pass filter with an internal ~15 kΩ resistance. This allows users to reduce high-frequency noise on the OUT pin while preserving the core 1 MHz bandwidth. Recommended CFILTER values range from 1 pF to 100 pF depending on target cutoff frequency and layout parasitics.
Is CTD416-65AC suitable for new designs?
No - CTD416-65AC is classified as "Not for New Design" effective March 28, 2025. Allegro recommends CT417-HSN865MR for new designs. CTD416-65AC remains in production solely for existing customer applications; samples are no longer available, and obsolescence is probable in the near future.
CTD416-65AC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- XtremeSense™ Crocus Technology
- Packaging:
- Bulk
- Product Status:
- Active
- Sensor Type:
- Current Sensor
- Sensing Range:
- ±65A
- Interface:
- Analog
- Sensitivity:
- 15.4mV/A
- Voltage - Supply:
- 3V ~ 3.6V
- Embedded:
- No
- Contents:
- Board(s)
- Utilized IC / Part:
- CT416
CTD416-65AC FAQ
1.How can I place an order for CTD416-65AC through Aetrix?
Please submit a Request for Quotation (RFQ) for CTD416-65AC 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 CTD416-65AC reliable?
The price and inventory of CTD416-65AC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CTD416-65AC is usually 5 days.
3.What payment methods are accepted for CTD416-65AC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CTD416-65AC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CTD416-65AC?
CTD416-65AC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CTD416-65AC 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 CTD416-65AC?
For technical support, including CTD416-65AC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CTD416-65AC requirements.
6.How does Aetrix verify that CTD416-65AC is sourced from the original manufacturer or authorized distributors?
All CTD416-65AC 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 CTD416-65AC meets industry standards.
7.What is the process for return or replacement of CTD416-65AC?
All CTD416-65AC units undergo pre-shipment inspection (PSI). If there is an issue with CTD416-65AC, 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 CTD416-65AC part is unused and in its original packaging.
Return procedure for CTD416-65AC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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