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Melexis Technologies NV US79KUA-AAA-001-SP
- Part No.:
- US79KUA-AAA-001-SP
- Manufacturer:
- Melexis Technologies NV
- Category:
- Motor Drivers, Controllers
- Package:
- -
- Datasheet:
-
US79KUA-AAA-001-SP.pdf
- Description:
- IC MOTOR DRIVER ON/OFF
- Quantity:
- Payment:
- Shipping:
Inventory:2,853
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Product details
Overview
US79KUA-AAA-001-SP from Melexis is a CMOS Power Hall IC designed for brushless DC fan commutation in 5V and 12V cooling systems. It integrates Hall sensing, power MOSFET drivers, reverse voltage protection, RFI filtering, and locked-rotor shutdown-enabling 400mA output current with ≤1.1V saturation at 350mA, operating from −40°C to +125°C in TO-92 flat (UA) package.
For engineers reviewing the US79KUA-AAA-001-SP datasheet, pinout, applications, or equivalent options, key selection criteria include magnetic operate/release points (2.5–6.0 mT / −6.0 to −2.5 mT), thermal resistance (190°C/W), locked-rotor timing (0.8s on / 5s off), and Zener-clamped output protection.
Technical Context
The US79KUA-AAA-001-SP implements a monolithic Hall-effect sensor with integrated power FET drivers and protection circuitry. Its architecture combines a temperature-stable Hall plate with CMOS logic and high-current N-channel MOSFET outputs capable of 400mA continuous drive without external heatsinking.
Locked-rotor detection operates via motion monitoring: absence of rotation for ≥1 second triggers automatic 5-second shutdown followed by 1-second reactivation attempts until motion resumes. Reverse voltage protection leverages motor winding inductance rather than external diodes, while 35V Zener clamps safeguard outputs against inductive transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5–18 V - supports both 5V and 12V fan rails with margin for ripple and drop |
| Output Current | 400 mA max - drives fans up to 90mm without discrete transistors or PCB traces |
| Operate Point (BOP) | 2.5–6.0 mT - ensures reliable switching symmetry across temperature and aging |
| Release Point (BRP) | −6.0 to −2.5 mT - provides 2.0–5.0 mT hysteresis to prevent chatter near threshold |
| Thermal Resistance | 190 °C/W - enables self-cooling operation up to 125°C ambient without fan derating |
| Locked-Rotor Timing | ton = 0.8 s, toff = 5 s - limits power dissipation during stall while enabling auto-recovery |
| Supply Current | 1.4–2.0 mA - ultra-low quiescent draw preserves system efficiency in always-on cooling |
Pinout & Package
US79KUA-AAA-001-SP is housed in a TO-92 flat (UA) package with three leads: VDD, OUT, and GND. The Hall plate is centered beneath the die, aligned to optimize sensitivity to axial magnetic fields from rotating fan magnets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts 3.5–18 V; internal reverse-voltage protection eliminates need for external series diode |
| OUT | Power FET output | Drives fan coil directly; Zener-clamped to 35 V; 650–1100 mV saturation at 350 mA |
| GND | Ground reference | Common return for Hall sensor, logic, and power FET; thermally coupled to die for accurate junction temp tracking |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall + Power FET | Monolithic CMOS Hall sensor and N-channel driver eliminate all discrete components and PC board |
| Locked-Rotor Shutdown | Automatically disables output for 5 seconds after 1-second motion loss, then retries-prevents thermal runaway |
| RFI Filtering | On-chip RC network suppresses electromagnetic interference from commutation noise, meeting EMC requirements without external filters |
| Zener Output Clamping | 35 V clamping on OUT pin protects against inductive kickback from fan windings during switching |
| Reverse Voltage Protection | Internal circuitry blocks reverse current flow through motor windings-no external diode required |
Applications
| Computer Cooling Fan Control | Industrial Blower Commutation |
|---|---|
Use Scenario: Regulating airflow in desktop and server chassis using two-wire, two-coil brushless DC fans. IC Role / Device Role / Timing Role: Hall-based commutator providing synchronized phase switching and stall detection. Use Value: Eliminates fan controller PCB and reduces BOM cost by $0.25–$0.35 per unit while maintaining 400mA drive capability. | Use Scenario: Driving 90mm blowers in factory automation enclosures exposed to dust, vibration, and 125°C ambient. IC Role / Device Role / Timing Role: High-temp-rated Hall IC delivering robust rotor position sensing and protected power switching. Use Value: Enables fan operation without derating at full 125°C ambient due to 190°C/W thermal resistance and junction-limited shutdown. |
| Automotive HVAC Blower | Medical Equipment Ventilation |
Use Scenario: Controlling cabin air blower motors in passenger vehicles where space and reliability are critical. IC Role / Device Role / Timing Role: Smart Hall driver managing commutation and detecting stalled rotors during filter clogging events. Use Value: Prevents overheating and fire risk during prolonged stall via automatic 5-second off-cycle and retry sequence. | Use Scenario: Providing fail-safe airflow in diagnostic imaging equipment requiring silent, low-EMI cooling. IC Role / Device Role / Timing Role: Low-noise Hall commutator with built-in RFI filtering and precise magnetic thresholds. Use Value: Reduces conducted EMI by integrating filtering-eliminating external capacitors and avoiding interference with sensitive analog sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect fan driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MLX90217KGO-AAA-000-SP | Higher operate point (4–10 mT); no integrated power FET-requires external driver stage | Suitable only when external MOSFETs are acceptable; lacks 400mA drive and locked-rotor logic | Select if magnetic field strength exceeds US79KUA-AAA-001-SP range and discrete drive is already present |
| ALLEGRO A3921KLPTR-T | Full H-bridge output (±400mA); requires external Hall sensor and logic; no integrated RFI filter or Zener clamp | Designed for bidirectional motor control-not optimized for single-coil fan commutation | Choose only when direction reversal or higher peak current is required; adds complexity and component count |
Compared with MLX90217KGO-AAA-000-SP and A3921KLPTR-T, US79KUA-AAA-001-SP delivers complete fan control in one TO-92 device-including sensing, drive, protection, and stall recovery-reducing footprint, cost, and design validation effort.
Availability
US79KUA-AAA-001-SP is available at Aetrix Electronics and suitable for computer cooling, industrial blower, automotive HVAC, and medical ventilation systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for US79KUA-AAA-001-SP 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
Melexis is a Belgian semiconductor company specializing in sensor and driver ICs for automotive, industrial, and consumer applications, with ISO/TS 16949 and ISO 14001 certification.
The US79 Series was developed specifically for intelligent, self-protected brushless DC fan control-replacing multi-component solutions with a single monolithic Hall IC that integrates sensing, logic, power switching, and fault management.
FAQ
What is the maximum continuous output current supported by US79KUA-AAA-001-SP?
US79KUA-AAA-001-SP supports 400 mA continuous output current without external heatsinking. This rating is validated across the full operating temperature range (−40°C to +125°C) and enables direct drive of fans up to 90 mm. At 350 mA, saturation voltage remains ≤1.1 V, ensuring low power loss and thermal stability in the TO-92 flat package.
Does US79KUA-AAA-001-SP require an external PCB or discrete components?
No-US79KUA-AAA-001-SP is designed to eliminate all discrete components including capacitors, resistors, transistors, diodes, and the fan controller PCB itself. Its monolithic integration of Hall sensor, CMOS logic, power MOSFET drivers, RFI filter, Zener clamps, and reverse-voltage protection enables direct wire-to-motor connection in two-wire or two-coil fan configurations.
How does the locked-rotor protection function in US79KUA-AAA-001-SP?
US79KUA-AAA-001-SP detects locked rotor when no motion is sensed for ≥1 second, then shuts off the output for exactly 5 seconds before attempting 1-second reactivation. This cycle repeats indefinitely until motion resumes. This behavior prevents thermal damage during mechanical blockage while enabling autonomous recovery without system-level intervention.
What magnetic field strength is required to reliably switch US79KUA-AAA-001-SP?
US79KUA-AAA-001-SP switches reliably within a magnetic operate point (BOP) range of 2.5–6.0 mT and releases between −6.0 and −2.5 mT, providing 2.0–5.0 mT hysteresis. These values are specified at 25°C and maintained over the full −40°C to +125°C range, ensuring consistent commutation timing across environmental conditions and magnet aging.
Is US79KUA-AAA-001-SP compatible with both 5V and 12V fan supplies?
Yes-US79KUA-AAA-001-SP operates across a supply voltage range of 3.5 V to 18 V, making it fully compatible with standard 5 V and 12 V cooling rails. Its internal regulation and low 1.4–2.0 mA supply current ensure stable performance across both voltages without external biasing or level-shifting circuitry.
US79KUA-AAA-001-SP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Melexis Technologies NV
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- -
- Function:
- -
- Output Configuration:
- -
- Interface:
- -
- Technology:
- -
- Step Resolution:
- -
- Applications:
- -
- Current - Output:
- -
- Voltage - Supply:
- -
- Voltage - Load:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
US79KUA-AAA-001-SP FAQ
1.How can I place an order for US79KUA-AAA-001-SP through Aetrix?
Please submit a Request for Quotation (RFQ) for US79KUA-AAA-001-SP 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 US79KUA-AAA-001-SP reliable?
The price and inventory of US79KUA-AAA-001-SP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US79KUA-AAA-001-SP is usually 5 days.
3.What payment methods are accepted for US79KUA-AAA-001-SP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US79KUA-AAA-001-SP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US79KUA-AAA-001-SP?
US79KUA-AAA-001-SP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US79KUA-AAA-001-SP 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 US79KUA-AAA-001-SP?
For technical support, including US79KUA-AAA-001-SP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US79KUA-AAA-001-SP requirements.
6.How does Aetrix verify that US79KUA-AAA-001-SP is sourced from the original manufacturer or authorized distributors?
All US79KUA-AAA-001-SP 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 US79KUA-AAA-001-SP meets industry standards.
7.What is the process for return or replacement of US79KUA-AAA-001-SP?
All US79KUA-AAA-001-SP units undergo pre-shipment inspection (PSI). If there is an issue with US79KUA-AAA-001-SP, 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 US79KUA-AAA-001-SP part is unused and in its original packaging.
Return procedure for US79KUA-AAA-001-SP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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