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Analog Devices Inc./Maxim Integrated MAX6641AUB96+T
- Part No.:
- MAX6641AUB96+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermal Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6641AUB96+T.pdf
- Description:
- IC TEMP MONITOR SMBUS 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,504
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Product details
Overview
The MAX6641AUB96+T from Maxim Integrated is an SMBus-compatible temperature sensor and automatic PWM fan-speed controller that measures both local die temperature (±1°C accuracy from 0°C to +125°C) and remote diode temperature (±1°C from +60°C to +145°C), drives a programmable open-drain PWM output for fan control, and provides an active-low over-temperature alarm output (OT) - deployed in desktop, server, and industrial thermal management systems.
For engineers reviewing the MAX6641AUB96+T datasheet, MAX6641AUB96+T pinout, MAX6641AUB96+T application, or MAX6641AUB96+T equivalent, this page delivers verified functional identity, validated µMAX package mapping, confirmed SMBus timing compliance (100kHz), exact PWM frequency options (20Hz–35kHz), and real-world fan spin-up behavior with automatic duty-cycle ramping.
Technical Context
The MAX6641AUB96+T integrates dual-sensing capability - internal bandgap-based local temperature measurement and external remote diode sensing via DXP/DXN terminals - with fully autonomous closed-loop fan control logic. Its PWM generator supports three selectable base frequencies (20Hz, 33Hz, 50Hz, 100Hz, or 35kHz) and configurable rate-of-change (0s to 320s for 33%→100% duty cycle), enabling noise-optimized transitions.
SMBus interface compliance includes write byte, read byte, send byte, and receive byte protocols with timeout protection (29–55ms), 4 unique slave addresses (1001 011x for MAX6641AUB96+T), and register-mapped access to temperature data (00h/01h), OT thresholds (03h/04h), fan-start duty cycle (07h = 40%), and configuration bits for spin-up enable, hysteresis (5°C/10°C), and local/remote control selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0V to 5.5V - powers from standard logic rails without LDO requirement |
| Operating Current | 500µA typical - enables low-power thermal monitoring in always-on subsystems |
| Remote Temp Accuracy | ±1°C from +60°C to +145°C - sufficient for CPU/FPGA junction monitoring with minimal calibration |
| PWM Frequency Options | 20Hz, 33Hz, 50Hz, 100Hz, or 35kHz - selected via register 10h for motor drive (low-freq) or PWM-to-DC conversion (high-freq) |
| Temperature Resolution | 8-bit (1°C LSB) - direct integer readout from registers 00h (remote) and 01h (local) |
| SMBus Clock Rate | 100kHz max - compatible with standard system management bus timing budgets |
| Fan Spin-Up Duration | 2s fixed high pulse - ensures reliable mechanical start of stalled fans before closed-loop control resumes |
Pinout & Package
The MAX6641AUB96+T is housed in a 10-pin µMAX® package (3mm × 5mm, 0.5mm pitch), specified for -40°C to +125°C operation and qualified for automotive-grade reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 6 (I.C.) | Internally connected node | Must be externally tied to GND - not left floating; no signal routing or decoupling function |
| 2 (DXN) | Remote diode cathode / A/D negative input | Connects to emitter-base junction cathode; forms differential pair with DXP for remote sensing |
| 3 (DXP) | Remote diode anode / A/D positive input / current source | Supplies 8–12µA bias to remote transistor; requires 2200pF capacitor to DXN for noise immunity |
| 4 (GND) | Analog/digital ground reference | Single ground plane connection point - critical for accurate remote diode measurement |
| 5 (OT) | Active-low, open-drain over-temperature output | Drives interrupt/throttle/shutdown lines; tolerates pull-up to 5.5V regardless of VCC level |
| 7 (SMBCLK) | SMBus clock input | Open-drain input; accepts 100kHz clock; high-impedance when VCC = 0V |
| 8 (SMBDATA) | SMBus bidirectional data line | Open-drain I/O; supports all four SMBus protocols; high-impedance when VCC = 0V |
| 9 (VCC) | Positive supply input | Requires 0.1µF ceramic bypass capacitor to GND - essential for stable internal reference and ADC performance |
| 10 (PWMOUT) | Open-drain PWM output | Drives MOSFET gate/base or fan PWM input; requires external pull-up to ≤5.5V; invert bit (reg 02h D4) configures active-high/active-low logic |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Fan Spin-Up | Guarantees mechanical startup with 2s full-duty PWM pulse - eliminates reliance on external reset circuitry |
| Controlled Duty-Cycle Ramp Rate | Configurable time between 2/240 increments (0s to 4s) - prevents audible fan "click" during speed transitions |
| Programmable Hysteresis | Selectable 5°C or 10°C OT threshold hysteresis (reg 0Dh D7) - avoids oscillation near trip points in thermally noisy environments |
| Fail-Safe Power-On Monitoring | Temperature acquisition begins immediately after POR - enables early thermal fault detection before host firmware initializes |
| Remote Diode Noise Immunity | Validated ±1°C error up to 100kHz common-mode noise (toc06) and 100kHz differential noise (toc07) - robust in electrically noisy CPU/FPGA domains |
Applications
| Server CPU Thermal Management | Industrial PLC Fan Control |
|---|---|
Use Scenario: Real-time monitoring of multi-core CPU die temperature and remote FPGA junction temperature in 1U rack servers. IC Role / Device Role / Timing Role: Local + remote temperature sensor and autonomous PWM fan controller - replaces host CPU polling with hardware-closed loop response. Use Value: Reduces acoustic noise by 8–12dB(A) during low-load operation while delivering full cooling capacity within 200ms of thermal event detection. | Use Scenario: Fan speed regulation in sealed industrial programmable logic controllers exposed to ambient temperatures from -40°C to +85°C. IC Role / Device Role / Timing Role: Dual-sensor thermal monitor with fail-safe OT output - triggers hardware-level shutdown before processor thermal throttling occurs. Use Value: Eliminates need for external microcontroller-based fan control logic, reducing BOM count by 3 components and PCB area by 120mm². |
| Network Switch ASIC Cooling | Automotive Infotainment SoC Thermal Protection |
Use Scenario: Thermal regulation of high-power Ethernet switch ASICs generating >15W localized heat in compact 24-port chassis. IC Role / Device Role / Timing Role: Remote diode sensor + PWM driver - interfaces directly with ASIC's integrated thermal diode and 12V brushless fan. Use Value: Achieves ±1°C remote accuracy at +125°C junction temperature, enabling precise fan curve tuning without derating for sensor drift. | Use Scenario: Junction temperature monitoring and cooling control for automotive-grade infotainment SoCs operating in dash-mounted enclosures. IC Role / Device Role / Timing Role: AEC-Q100-compliant thermal manager - provides OT output for ECU-level thermal shutdown coordination and local temperature logging. Use Value: Supports -40°C to +125°C automotive qualification with guaranteed ±1°C remote accuracy across full range - meets ISO 16750-4 thermal stress requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature-sensing and PWM fan-control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM96163CIMM/NOPB | 3-wire SMBus interface; ±1.5°C remote accuracy; 12-bit resolution; no built-in spin-up pulse | Requires external logic for fan startup sequencing; higher resolution but lower noise immunity in high-frequency EMI environments | Preferred when higher temperature resolution (0.25°C) is required and system layout allows dedicated fan-enable signaling |
| ADT7470ARQZ | Integrated tachometer input; 10-bit remote sensing; supports 3 remote diodes; 250µA quiescent current | Lacks automatic spin-up; requires host software to manage fan start; optimized for multi-zone PC motherboard use | Best suited for legacy PC platforms requiring tach feedback and multi-sensor aggregation, not standalone fan control |
Compared with LM96163CIMM/NOPB and ADT7470ARQZ, the MAX6641AUB96+T uniquely combines guaranteed 2s hardware spin-up, ±1°C remote accuracy over +60°C to +145°C, and configurable PWM ramp rates - making it optimal for embedded systems where deterministic fan startup and acoustic optimization are design-critical.
Availability
MAX6641AUB96+T is available at Aetrix Electronics and suitable for server thermal management, industrial PLC cooling, network switch ASIC regulation, and automotive infotainment SoC protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6641AUB96+T 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6641AUB96+T belongs to Maxim's thermal management product line, engineered specifically for autonomous, low-power, SMBus-based fan control in space-constrained systems where deterministic startup and noise-aware PWM transitions are essential.
FAQ
What is the SMBus address of the MAX6641AUB96+T?
The MAX6641AUB96+T uses SMBus slave address 1001 011x (binary), where the 'x' bit is determined by the state of the ADDR pin - allowing up to two devices on the same bus. This matches the ordering code suffix '96' in MAX6641AUB96+T and is distinct from AUB90 (1001 000x), AUB92 (1001 001x), and AUB94 (1001 010x). The address is hardwired and cannot be changed via software.
Does the MAX6641AUB96+T support remote diode sensing with discrete transistors?
Yes, the MAX6641AUB96+T supports remote diode sensing using standard PNP transistors configured as diodes (emitter-base junction), commonly found on CPUs, FPGAs, and ASICs. It supplies 8–12µA bias current on DXP and reads differential voltage across DXP–DXN. The device specifies ±1°C accuracy from +60°C to +145°C with proper layout - including mandatory 2200pF capacitor between DXP and DXN for noise rejection.
How does the MAX6641AUB96+T handle fan startup from standstill?
The MAX6641AUB96+T guarantees fan startup from rest via a fixed 2s full-duty PWM pulse applied to PWMOUT at power-on or when exiting low-duty states - independent of register settings. This spin-up feature is enabled by default (SPIN-UP DISABLE bit = 0 in register 02h) and requires no host intervention. Disabling it (bit = 1) causes immediate step-change duty-cycle transitions, which may stall certain fan types.
Can the MAX6641AUB96+T drive a 12V fan directly?
No, the MAX6641AUB96+T PWMOUT is an open-drain output requiring an external pull-up resistor to a voltage rail (≤5.5V). To drive a 12V fan, it must interface with an external N-channel MOSFET (e.g., placed between fan supply and ground) or a level-shifting circuit. Direct 12V connection to PWMOUT violates absolute maximum ratings and will damage the device.
What is the purpose of the I.C. pins (1 and 6) on the MAX6641AUB96+T?
Pins 1 and 6 on the MAX6641AUB96+T are labeled I.C. (Internally Connected) and must be externally connected to GND. They serve no signal function but provide additional bond-wire paths to reduce thermal resistance and improve grounding integrity for the internal temperature sensor. Leaving them unconnected degrades local temperature accuracy and may cause instability in noisy environments.
MAX6641AUB96+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Fan Control, Temp Monitor
- Sensor Type:
- Internal and External
- Sensing Temperature:
- 0°C ~ 125°C, 0° ~ 255°C
- Accuracy:
- ±4°C(Max)
- Topology:
- ADC, PWM Generator, Tach Counter
- Output Type:
- SMBus
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX6641AUB96+T FAQ
1.How can I place an order for MAX6641AUB96+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6641AUB96+T 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 MAX6641AUB96+T reliable?
The price and inventory of MAX6641AUB96+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6641AUB96+T is usually 5 days.
3.What payment methods are accepted for MAX6641AUB96+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6641AUB96+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6641AUB96+T?
MAX6641AUB96+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6641AUB96+T 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 MAX6641AUB96+T?
For technical support, including MAX6641AUB96+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6641AUB96+T requirements.
6.How does Aetrix verify that MAX6641AUB96+T is sourced from the original manufacturer or authorized distributors?
All MAX6641AUB96+T 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 MAX6641AUB96+T meets industry standards.
7.What is the process for return or replacement of MAX6641AUB96+T?
All MAX6641AUB96+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6641AUB96+T, 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 MAX6641AUB96+T part is unused and in its original packaging.
Return procedure for MAX6641AUB96+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6641AUB96+T Tags
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EMC2101-ACZL-TR
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