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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Melexis Technologies NV US90AEZE-AAA-000-SP

Name: US90AEZE-AAA-000-SP
Brand: Melexis Technologies NV
SKU: US90AEZE-AAA-000-SP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: US90AEZE-AAA-000-SP

Manufacturer:: Melexis Technologies NV

Category:: Motor Drivers, Controllers

Package:: SOT-23-5 Flat Leads

Datasheet:: US90AEZE-AAA-000-SP.pdf

Description:: IC MOTOR DRIVER SOT25

Quantity:: RFQ Add To RFQ list

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Inventory:4,277

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Product details

Overview

US90AEZE-AAA-000-SP from Melexis is a Hall-effect-based two-coil brushless DC fan driver IC with integrated tachometer (FG) output, no-VDD architecture, 500 mA peak output current, and SOT25 straight-leads package. It drives 12V/24V cooling fans in thermal management systems where compact size and rotor stall protection are critical.

For engineers reviewing the US90AEZE-AAA-000-SP datasheet, pinout, applications, or equivalent options, key selection criteria include FG signal compatibility with Super I/O monitoring, locked-rotor auto-restart timing (210–350 ms ON), and thermal resistance (170°C/W for ZE package) under continuous 250 mA load.

Technical Context

The US90AEZE-AAA-000-SP implements a Hall-effect sensor with dynamic offset correction and dual low-side open-drain MOSFET drivers. Its no-VDD design eliminates the need for a dedicated supply pin by deriving operating power from the fan coil voltage drop, enabling 4-pin TO92-compatible packaging even in the 5-pin SOT25 variant.

Driver outputs switch complementary based on magnetic pole polarity (North: OUT1 high/OUT2 low; South: OUT1 low/OUT2 high), while the FG output delivers frequency-proportional pulses synchronized to rotor position. Locked-rotor protection triggers at <60 RPM and cycles ON/OFF every ~1.5 seconds with 210–350 ms active duration.

Key Specifications

Parameter	Value and Actual Design Meaning
Fan Supply Voltage	4.7 V min (determined by coil resistance & IDD), up to 30 V - supports 12V/24V fan rails without external regulation
Peak Output Current	500 mA - limits inrush current during startup without external current limiting
Continuous Output Current	250 mA - sustains steady-state fan operation with thermal derating per ZE package R_THja = 170°C/W
FG Output Type	Open-drain, 20 mA sink capability - interfaces directly with 3.3V/5V hardware monitoring ICs using external pull-up
Operate / Release Points	B_OP = 3–6 mT, B_RP = 3–6 mT - ensures reliable commutation across temperature with 2–6 mT hysteresis
Locked Rotor ON Time	210–350 ms - defines active stall current duration before auto-restart, reducing average power dissipation

Pinout & Package

SOT25 package (5-pin, straight leads) with 1.27 mm pitch; body dimensions 2.9 mm × 1.6 mm × 1.1 mm; RoHS-compliant, lead-free finish.

Pin/Terminal	Circuit Role	Design Meaning
FG	Open-drain tachometer output	Delivers frequency-proportional pulses tied 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 500 mA peak, protected against inductive kickback
OUT2	Low-side coil driver 2	Switches fan coil 2 to GND; complements OUT1 per Hall polarity; shares same protection features
GND	Power and signal reference	Common return path for coil current, FG sink current, and internal circuitry; must be low-impedance
NC	No-connect terminal	Internally unconnected; recommended to tie to GND for optimal EMC performance per datasheet guidance

Key Features

Feature	Design Value
No-VDD architecture	Eliminates dedicated supply pin by powering IC from fan coil voltage drop - enables compact 5-pin SOT25 layout and prevents reverse-voltage damage
Integrated locked-rotor protection	Auto-shuts off coil current when RPM <60 (4-pole magnet), then restarts every 1.5 s - reduces average stall power to 1/7 of normal, preventing fan burnout
Built-in output clamping diode	Clamps inductive voltage spikes up to 80 V at OUT1/OUT2 - removes need for external zener diodes in fan drive circuits
Dynamic offset-corrected Hall sensor	Compensates for sensor drift over temperature and stress - maintains consistent B_OP/B_RP (3–6 mT) across -40°C to +125°C junction range

Applications

Server CPU Cooling	Industrial PLC Enclosure Fans
Use Scenario: Forced-air cooling of multi-core CPUs in 1U rack servers with strict airflow and space constraints. IC Role / Device Role / Timing Role: Two-coil BLDC fan driver with FG feedback for closed-loop speed control via BMC/IPMI. Use Value: No-VDD design reduces PCB footprint vs. 6-pin alternatives; FG output directly interfaces with ASPEED AST2500/AST2600 Super I/O without level-shifting.	Use Scenario: Continuous-duty cooling of DIN-rail mounted PLCs operating in ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Fan controller with locked-rotor auto-restart to maintain thermal safety during dust-clogged operation. Use Value: 210–350 ms LRP ON time limits average stall power, enabling reliable long-term operation without thermal shutdown.
Automotive Engine Bay Modules	Medical Imaging Power Supplies
Use Scenario: Cooling fans for ADAS domain controllers exposed to 125°C under-hood transients. IC Role / Device Role / Timing Role: Brushless fan driver with Hall sensing and integrated protection for harsh-environment thermal management. Use Value: Junction temperature rating (-40°C to +125°C) and 4 kV HBM ESD tolerance ensure robustness against automotive load-dump and ESD events.	Use Scenario: Redundant cooling in MRI/X-ray power supply cabinets requiring silent, reliable airflow. IC Role / Device Role / Timing Role: Low-noise BLDC driver with FG output for speed verification and predictive maintenance logging. Use Value: Open-drain FG output provides clean, isolated tach signal compatible with medical-grade isolation amplifiers and data loggers.

Server CPU Cooling

Industrial PLC Enclosure Fans

Use Scenario: Forced-air cooling of multi-core CPUs in 1U rack servers with strict airflow and space constraints.

IC Role / Device Role / Timing Role: Two-coil BLDC fan driver with FG feedback for closed-loop speed control via BMC/IPMI.

Use Value: No-VDD design reduces PCB footprint vs. 6-pin alternatives; FG output directly interfaces with ASPEED AST2500/AST2600 Super I/O without level-shifting.

Use Scenario: Continuous-duty cooling of DIN-rail mounted PLCs operating in ambient temperatures up to 70°C.

IC Role / Device Role / Timing Role: Fan controller with locked-rotor auto-restart to maintain thermal safety during dust-clogged operation.

Use Value: 210–350 ms LRP ON time limits average stall power, enabling reliable long-term operation without thermal shutdown.

Automotive Engine Bay Modules

Medical Imaging Power Supplies

Use Scenario: Cooling fans for ADAS domain controllers exposed to 125°C under-hood transients.

IC Role / Device Role / Timing Role: Brushless fan driver with Hall sensing and integrated protection for harsh-environment thermal management.

Use Value: Junction temperature rating (-40°C to +125°C) and 4 kV HBM ESD tolerance ensure robustness against automotive load-dump and ESD events.

Use Scenario: Redundant cooling in MRI/X-ray power supply cabinets requiring silent, reliable airflow.

IC Role / Device Role / Timing Role: Low-noise BLDC driver with FG output for speed verification and predictive maintenance logging.

Use Value: Open-drain FG output provides clean, isolated tach signal compatible with medical-grade isolation amplifiers and data loggers.

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; no NC pin; higher R_THja = 200°C/W	Manual assembly only; less suitable for automated SMT lines due to through-hole form factor	Select for cost-sensitive, low-volume thermal modules where board space allows TO92 mounting
US90ADC-AAA-000-RX	Same die, 8-pin SOIC-8 package; pins 5–8 are NC; R_THja = 150°C/W	Supports higher continuous current in dense layouts; requires larger PCB area than SOT25	Select when thermal margin is critical and board real estate permits wider SOIC footprint

Compared with US90AVK-AAA-000-BU and US90ADC-AAA-000-RX, the US90AEZE-AAA-000-SP offers the smallest SMT-compatible footprint (SOT25) with balanced thermal performance (170°C/W), making it optimal for space-constrained, high-density fan modules requiring automated assembly.

Availability

US90AEZE-AAA-000-SP is available at Aetrix Electronics and suitable for server CPU cooling, industrial PLC enclosure fans, and automotive engine bay modules requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for US90AEZE-AAA-000-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 ICs, high-performance mixed-signal chips, and magnetic position sensors for automotive, industrial, and consumer markets.

The US90AEZE-AAA-000-SP belongs to Melexis' US90A/US91A fan driver family, designed specifically for compact, reliable, and self-protected two-coil BLDC fan control in thermally demanding environments.

FAQ

What is the function of the NC pin on the US90AEZE-AAA-000-SP?

The NC (No Connect) pin on the US90AEZE-AAA-000-SP is internally unconnected but recommended to be tied to GND per the datasheet for optimal EMC performance. It does not carry current or signal, and leaving it floating may increase susceptibility to noise coupling into the FG or driver outputs. This recommendation applies specifically to the SOT25 package variant of the US90AEZE-AAA-000-SP.

Does the US90AEZE-AAA-000-SP require an external power supply (VDD)?

No - the US90AEZE-AAA-000-SP uses a patented no-VDD architecture that derives operating power directly from the fan coil voltage drop. This eliminates the need for a separate VDD pin or external regulator, simplifying PCB layout and improving reverse-voltage robustness. The US90AEZE-AAA-000-SP functions solely with fan supply voltage applied across OUT1/OUT2 and GND, confirming its self-powered operation as specified in the US90AEZE-AAA-000-SP datasheet.

How does the FG output of the US90AEZE-AAA-000-SP interface with system monitoring ICs?

The FG output of the US90AEZE-AAA-000-SP is an open-drain signal requiring an external pull-up resistor (typically 4.7 kΩ to 3.3V or 5V). It delivers clean, logic-compatible pulses synchronized to rotor position, enabling direct connection to hardware monitoring ICs like Nuvoton NCT6798 or ITE IT8728 without level-shifting. The US90AEZE-AAA-000-SP's FG output sinks up to 20 mA, ensuring reliable signal integrity across standard SMBus/I²C monitoring buses.

What is the locked-rotor protection behavior of the US90AEZE-AAA-000-SP?

The US90AEZE-AAA-000-SP detects locked rotor when rotational speed falls below 60 RPM (for a 4-pole magnet) and shuts off coil current for 6.3×Ton (where Ton = 210–350 ms). It then attempts automatic restart every ~1.5 seconds until rotation resumes. This cycling reduces average stall power to 1/7 of nominal, preventing thermal damage - a core behavior confirmed for the US90AEZE-AAA-000-SP in Section 8.3 of its official datasheet.

Can the US90AEZE-AAA-000-SP drive both 12V and 24V fans?

Yes - the US90AEZE-AAA-000-SP supports fan supply voltages from 4.7 V (calculated per coil resistance and IDD) up to 30 V, covering standard 12V and 24V BLDC fan rails. Its output clamp voltage (60–80 V) and absolute maximum V_OUT rating (100 V) ensure safe operation during inductive flyback events common in both voltage classes. This dual-voltage capability is explicitly validated for the US90AEZE-AAA-000-SP in Table 4 and Section 10 of the datasheet.

US90AEZE-AAA-000-SP Specifications

Product attributes: Attribute value

Manufacturer:: Melexis Technologies NV

Series:: -

Package/Case:: SOT-23-5 Flat Leads

Packaging:: Bulk

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-SP FAQ

1.How can I place an order for US90AEZE-AAA-000-SP through Aetrix?

Please submit a Request for Quotation (RFQ) for US90AEZE-AAA-000-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 US90AEZE-AAA-000-SP reliable?

The price and inventory of US90AEZE-AAA-000-SP 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-SP is usually 5 days.

3.What payment methods are accepted for US90AEZE-AAA-000-SP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for US90AEZE-AAA-000-SP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for US90AEZE-AAA-000-SP?

US90AEZE-AAA-000-SP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your US90AEZE-AAA-000-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 US90AEZE-AAA-000-SP?

For technical support, including US90AEZE-AAA-000-SP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your US90AEZE-AAA-000-SP requirements.

6.How does Aetrix verify that US90AEZE-AAA-000-SP is sourced from the original manufacturer or authorized distributors?

All US90AEZE-AAA-000-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 US90AEZE-AAA-000-SP meets industry standards.

7.What is the process for return or replacement of US90AEZE-AAA-000-SP?

All US90AEZE-AAA-000-SP units undergo pre-shipment inspection (PSI). If there is an issue with US90AEZE-AAA-000-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 US90AEZE-AAA-000-SP part is unused and in its original packaging.

Return procedure for US90AEZE-AAA-000-SP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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