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Melexis Technologies NV US90AEZE-AAA-000-RE
- Part No.:
- US90AEZE-AAA-000-RE
- Manufacturer:
- Melexis Technologies NV
- Category:
- Motor Drivers, Controllers
- Package:
- SOT-23-5 Flat Leads
- Datasheet:
-
US90AEZE-AAA-000-RE.pdf
- Description:
- IC MOTOR DRIVER SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
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Product details
Overview
US90AEZE-AAA-000-RE from Melexis is a Hall-effect-based two-coil brushless DC fan driver IC with integrated tachometer (FG) output, no-VDD architecture, 500mA peak output current, and SOT25 straight-leads package. It drives 12V/24V cooling fans in server chassis and industrial power supplies where compact size and locked-rotor protection are critical.
For engineers reviewing the US90AEZE-AAA-000-RE datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain FG signal compatibility with Super I/O monitoring, thermal resistance of 170°C/W (RTHJA), and absence of VDD pin enabling 4-pin TO92/SOT25 footprint efficiency.
Technical Context
The US90AEZE-AAA-000-RE implements a Hall-effect sensor with dynamic offset correction and dual low-side MOSFET drivers on a single CMOS die. Its no-VDD design eliminates the need for a dedicated supply pin by deriving operating power directly from the fan coil voltage path.
It features built-in locked-rotor protection (LRP) with 210–350ms ON time and auto-restart every 1.5 seconds, plus integrated clamping diodes on OUT1/OUT2 to suppress coil-induced transients up to 100V without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Supply Voltage | 4.7V to 30V - supports 12V/24V systems; minimum set by RCOIL × IDD + 4.5V |
| Peak Output Current | 500mA - enables reliable startup torque for 2-coil BLDC fans with typical RCOIL ≤ 60Ω |
| Output Saturation Voltage | 375mV @ 150mA - low conduction loss reduces self-heating during continuous operation |
| FG Output Type | Open-drain - compatible with 3.3V/5V hardware monitoring ICs via external pull-up |
| Operate / Release Points | BOP = 3–6mT, BRP = 3–6mT - magnetic hysteresis ensures stable commutation under vibration |
| Junction Temperature Range | −40°C to +125°C - qualified for industrial ambient environments with derated power at high TA |
| ESD HBM Rating | 4000V - meets IEC 61000-4-2 Level 3 for board-level robustness in fan modules |
Pinout & Package
SOT25 package (straight leads), 5-pin outline with one NC pin; thermally optimized for surface-mount assembly with junction-to-case resistance of 20°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FG | Open-drain tachometer output | Active-low pulse train synchronized to rotor position; requires external pull-up for logic-level interface |
| OUT1 | Low-side coil driver 1 | Switches fan coil 1 to GND; rated for 500mA peak, protected against >100V transients |
| OUT2 | Low-side coil driver 2 | Switches fan coil 2 to GND; complementary to OUT1 per Hall polarity detection |
| GND | Power and signal reference | Common return for drivers, Hall sensor, and FG output; must be low-impedance for EMC |
| N.C. | No connection | Unused pin; recommended to tie to GND per datasheet for optimal EMC behavior |
Key Features
| Feature | Design Value |
|---|---|
| No-VDD architecture | Eliminates dedicated supply pin, enabling 4-pin-compatible footprint in SOT25 while reducing reverse-voltage failure risk |
| Locked-rotor protection (LRP) | Shuts off coil current when RPM drops below 60 (4-pole magnet); cycles ON/OFF to limit average stall current to 1/7 normal |
| Integrated clamping diodes | Suppresses coil flyback transients up to 100V on OUT1/OUT2 - removes need for external zener diodes |
| Dynamic offset correction | Compensates Hall sensor drift over temperature and process variation, ensuring consistent BOP/BRP across −40°C to +125°C |
| RoHS-compliant packaging | SOT25 leadframe meets EU Directive 2011/65/EU; qualified for lead-free reflow per J-STD-020 |
Applications
| Server Chassis Cooling | Industrial Power Supply Fans |
|---|---|
|
Use Scenario: Forced-air cooling of high-density CPU/GPU modules in 1U/2U rack servers requiring silent, reliable airflow. IC Role / Device Role / Timing Role: Two-coil BLDC fan driver with FG tach feedback for speed regulation and health monitoring via BMC/IPMI. Use Value: No-VDD design simplifies PCB layout in space-constrained backplanes; LRP prevents thermal runaway during dust-clogged operation. |
Use Scenario: Thermal management of convection-limited AC/DC and DC/DC converters in factory automation controllers. IC Role / Device Role / Timing Role: Fan controller interfacing with isolated analog monitoring circuits and microcontroller-based thermal management firmware. Use Value: Open-drain FG output interfaces directly with 3.3V Super I/O ICs; 170°C/W RTHJA enables operation at 70°C ambient without heatsink. |
| Telecom Line Card Ventilation | Medical Imaging Power Modules |
|
Use Scenario: Airflow control in compact, fan-cooled optical line cards with strict EMI limits and zero maintenance requirements. IC Role / Device Role / Timing Role: Brushless fan actuator with integrated Hall sensing and tachometer generation for closed-loop speed control. Use Value: Built-in clamping diodes eliminate external transient suppression components, reducing BOM count and improving EMC margin. |
Use Scenario: Cooling of high-efficiency power modules in MRI and CT scanner subsystems where fan reliability impacts diagnostic uptime. IC Role / Device Role / Timing Role: Safety-critical fan driver with automatic restart after mechanical blockage to maintain thermal safety thresholds. Use Value: LRP auto-restart interval (1.5s) and 210–350ms ON time prevent coil overheating while maintaining detectable airflow presence for system diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar two-coil BLDC fan driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| US90AVK-AAA-000-BU | Same die, 4-pin VK (TO92) package with bent leads; RTHJA = 200°C/W vs 170°C/W for ZE | Through-hole assembly; less suitable for automated SMT lines; higher thermal resistance limits max ambient | Select for legacy through-hole designs or manual repair scenarios where SOT25 reflow is unavailable |
| US90ADC-AAA-000-RX | Same die, SOIC-8 package; includes 4 NC pins; RTHJA = 150°C/W; same FG functionality | Higher thermal performance and board-level ESD margin; larger footprint; requires 8-pad layout | Select when thermal headroom is constrained and PCB real estate permits SOIC-8; preferred for high-reliability telecom deployments |
Compared with US90AVK-AAA-000-BU and US90ADC-AAA-000-RX, the US90AEZE-AAA-000-RE delivers the smallest SMT-compatible footprint with balanced thermal performance (170°C/W), making it optimal for space-constrained, high-volume server and industrial power applications requiring automated assembly.
Availability
US90AEZE-AAA-000-RE is available at Aetrix Electronics and suitable for server chassis cooling, industrial power supply fans, and telecom line card ventilation requiring stable component supply, RoHS compliance, and SMT-ready packaging.
Supply support for US90AEZE-AAA-000-RE 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 ICs and intelligent driver solutions for automotive, industrial, and consumer markets.
The US90A product line delivers highly integrated, no-VDD BLDC fan drivers targeting cost-sensitive, space-constrained thermal management in computing and power electronics.
FAQ
What is the function of the NC pin on US90AEZE-AAA-000-RE?
The NC (Not Connected) pin on US90AEZE-AAA-000-RE has no internal connection and must not be used for signal routing or power. Per the datasheet, it is recommended to connect this pin to GND to improve EMC performance by reducing parasitic antenna effects and stabilizing ground reference paths near the SOT25 package edge.
Does US90AEZE-AAA-000-RE require an external VDD supply?
No, US90AEZE-AAA-000-RE operates without an external VDD supply due to its patented no-VDD architecture. It derives operating power directly from the fan coil voltage path, eliminating the need for a dedicated supply pin and reducing reverse-voltage failure risk. This design enables the compact SOT25 5-pin configuration with only FG, OUT1, OUT2, GND, and NC terminals.
How does the locked-rotor protection (LRP) work in US90AEZE-AAA-000-RE?
US90AEZE-AAA-000-RE detects rotor stall when rotational speed falls below 60 RPM (for a 4-pole magnet), triggering automatic shutdown of coil current. It then cycles ON for 210–350ms and OFF for ~6.3× that duration, limiting average stall current to 1/7 of normal. This prevents overheating while enabling auto-restart attempts every 1.5 seconds until mechanical obstruction clears.
Can US90AEZE-AAA-000-RE drive both 12V and 24V fans?
Yes, US90AEZE-AAA-000-RE supports fan supply voltages from 4.7V to 30V, covering standard 12V and 24V BLDC fan systems. The minimum VDD is determined by coil resistance and supply current (VDD ≥ 4.5V + RCOIL × IDD), and absolute maximum rating is 30V, ensuring safe operation across both voltage classes without external regulation.
What is the purpose of the integrated clamping diodes in US90AEZE-AAA-000-RE?
The integrated clamping diodes in US90AEZE-AAA-000-RE suppress flyback voltage transients induced by fan coil inductance during switching, limiting OUT1/OUT2 voltage to ≤100V. This eliminates the need for external zener diodes or TVS devices, reducing BOM count, PCB area, and potential failure points while maintaining robust operation in noisy industrial environments.
US90AEZE-AAA-000-RE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Melexis Technologies NV
- Series:
- -
- Package/Case:
- SOT-23-5 Flat Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- -
- Interface:
- On/Off
- Technology:
- -
- Step Resolution:
- -
- Applications:
- Fan Motor Driver
- Current - Output:
- 250mA
- Voltage - Supply:
- 4.7V ~ 30V
- Voltage - Load:
- 4.7V ~ 30V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
US90AEZE-AAA-000-RE FAQ
1.How can I place an order for US90AEZE-AAA-000-RE through Aetrix?
Please submit a Request for Quotation (RFQ) for US90AEZE-AAA-000-RE 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 US90AEZE-AAA-000-RE reliable?
The price and inventory of US90AEZE-AAA-000-RE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for US90AEZE-AAA-000-RE is usually 5 days.
3.What payment methods are accepted for US90AEZE-AAA-000-RE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US90AEZE-AAA-000-RE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for US90AEZE-AAA-000-RE?
US90AEZE-AAA-000-RE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your US90AEZE-AAA-000-RE 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 US90AEZE-AAA-000-RE?
For technical support, including US90AEZE-AAA-000-RE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US90AEZE-AAA-000-RE requirements.
6.How does Aetrix verify that US90AEZE-AAA-000-RE is sourced from the original manufacturer or authorized distributors?
All US90AEZE-AAA-000-RE 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 US90AEZE-AAA-000-RE meets industry standards.
7.What is the process for return or replacement of US90AEZE-AAA-000-RE?
All US90AEZE-AAA-000-RE units undergo pre-shipment inspection (PSI). If there is an issue with US90AEZE-AAA-000-RE, 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 US90AEZE-AAA-000-RE part is unused and in its original packaging.
Return procedure for US90AEZE-AAA-000-RE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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