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Analog Devices Inc./Maxim Integrated MAX6668AUA50+
- Part No.:
- MAX6668AUA50+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6668AUA50+.pdf
- Description:
- THERMOSTAT 50DEGC ACT LOW 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,174
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Product details
Overview
MAX6668AUA50+ from Maxim Integrated is a remote-junction thermal switch with integrated +12V/250mA fan driver, factory-programmed trip threshold of +50°C, ±2.2°C max accuracy over -40°C to +125°C, and fixed 8°C hysteresis - used for autonomous fan control in notebook computers and PC power supplies.
For engineers reviewing the MAX6668AUA50+ datasheet, MAX6668AUA50+ pinout, MAX6668AUA50+ application, or MAX6668AUA50+ equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal switching behavior, and real-world fan-control design context without software dependency.
Technical Context
The MAX6668AUA50+ implements a dedicated analog temperature comparator that monitors voltage drop across an external diode-connected transistor (e.g., 2N3904) to infer junction temperature. It drives FANOUT as an open-drain power MOSFET only when remote temperature exceeds +50°C.
No calibration or microcontroller interface is required: internal current source (DXP/DXN), fixed hysteresis (8°C), POR circuit (1.5V typ), and 110µA typical supply current enable self-contained operation from +3V to +3.6V across automotive temperature range (-40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Trip Threshold | +50°C factory-programmed; triggers fan at exact thermal setpoint without user configuration. |
| Accuracy | ±2.2°C max over +40°C to +75°C remote-junction range; ensures reliable activation within system thermal margin. |
| FANOUT Drive | +12V/250mA open-drain sink; directly powers standard cooling fans without external transistor or gate driver. |
| Supply Range | +3V to +3.6V; compatible with 3.3V logic rails and automotive low-voltage systems. |
| Hysteresis | Fixed 8°C; prevents fan oscillation during slow thermal decay after trip event. |
| Quiescent Current | 110µA typical; enables always-on thermal monitoring with negligible impact on standby power. |
| Operating Temp | -40°C to +125°C; qualified for under-hood automotive, industrial embedded, and high-density computing environments. |
Pinout & Package
MAX6668AUA50+ is housed in an 8-pin µMAX package (3.0mm × 3.0mm × 0.8mm, lead pitch 0.65mm), optimized for space-constrained PCB layouts near heat sources like CPUs or VRMs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Return path for FANOUT MOSFET; must be routed separately from signal ground to avoid noise coupling into sensing inputs. |
| 2 FORCEON | Fan-Control Input | Active-low override: pulling low forces FANOUT on regardless of temperature, enabling manual or MCU-initiated fan activation. |
| 3 DXP | Current Source Positive | Supplies constant current to anode of remote diode; requires 2200pF capacitor to DXN for EMI filtering per layout guidelines. |
| 4 DXN | Current Sink Negative | Connects to cathode of remote diode; internally biased to VBE; forms Kelvin-sensing pair with DXP for accurate ∆VBE measurement. |
| 5,7 GND | Signal Ground | Reference for internal comparator and logic; must be connected to clean system ground plane, separate from PGND where possible. |
| 6 VDD | Positive Supply | +3V to +3.6V input; requires local 1µF ceramic bypass capacitor placed adjacent to pin for stable operation. |
| 8 FANOUT | Fan-Drive Output | Open-drain power MOSFET output; sinks up to 250mA at ≤1V saturation to drive +12V fans directly. |
Key Features
| Feature | Design Value |
|---|---|
| +12V/250mA integrated fan driver | Eliminates need for external MOSFET, gate driver, and level-shifting circuitry - reduces BOM count and layout complexity. |
| Factory-programmed +50°C trip point | Enables immediate deployment without trimming resistors, EEPROM programming, or firmware updates. |
| Fixed 8°C hysteresis | Guarantees stable on/off fan cycling without external components or configuration pins. |
| Remote diode sensing (DXP/DXN) | Supports direct CPU die temperature monitoring using on-die diodes or discrete transistors (e.g., 2N3904) with <100Ω base resistance. |
| 110µA typical supply current | Permits continuous thermal supervision in battery-backed or low-power standby modes without significant energy penalty. |
Applications
| Notebook Computers | PC Power Supplies |
|---|---|
Use Scenario: Thermal management of CPU/GPU die in ultra-thin laptops where airflow is constrained and fan noise must be minimized. IC Role / Device Role / Timing Role: Autonomous remote-junction thermal switch that activates cooling fan only when die temperature exceeds +50°C. Use Value: Prevents thermal throttling while avoiding unnecessary fan operation - extending battery life and reducing acoustic noise. |
Use Scenario: Overtemperature protection for +12V DC-DC converter stages in ATX PSUs operating under variable load conditions. IC Role / Device Role / Timing Role: Standalone fan controller that responds to heatsink temperature rise via discrete sensing transistor mounted on primary-side MOSFETs. Use Value: Enables rapid, deterministic fan response to localized hot spots without MCU intervention or complex thermal algorithms. |
| Network Switches | Laboratory Instruments |
Use Scenario: Fan speed control in 1U rack-mounted Ethernet switches with dense ASIC packaging and limited airflow paths. IC Role / Device Role / Timing Role: Remote temperature monitor interfaced to ASIC thermal diode outputs, driving chassis fans via FANOUT. Use Value: Maintains ASIC junction temperature below +85°C under full packet forwarding load, preventing link drops or reboots. |
Use Scenario: Temperature-triggered cooling in precision benchtop oscilloscopes or spectrum analyzers requiring stable analog front-end performance. IC Role / Device Role / Timing Role: Thermal watchdog that activates forced-air cooling when internal reference amplifier or ADC die exceeds safe operating limit. Use Value: Preserves measurement accuracy by limiting thermal drift of analog components before calibration drift becomes significant. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote-junction thermal switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6670AUB50+ | 10-pin µMAX; adds WARN (+15°C) and OT (+30°C) open-drain alarm outputs; HYST pin allows 4°C/8°C/12°C hysteresis selection. | Required when system-level thermal warning and hard shutdown signals are needed beyond basic fan control. | Select MAX6670AUB50+ if dual-stage thermal alerts or programmable hysteresis are mandatory; otherwise MAX6668AUA50+ offers simpler layout and lower cost. |
| LM75BIMM-5/NOPB | I²C digital temperature sensor with thermal interrupt; no integrated fan driver; ±2°C accuracy; operates from +2.7V to +5.5V. | Suitable only when fan control is handled externally (e.g., by MCU GPIO or PWM driver), not as a drop-in replacement. | Choose LM75BIMM-5/NOPB only when digital interface, logging capability, or multi-zone monitoring is prioritized over autonomous fan actuation. |
Compared with MAX6670AUB50+, MAX6668AUA50+ provides identical +50°C trip accuracy and fan drive strength but omits secondary alarm outputs and hysteresis flexibility - making it optimal for cost-sensitive, single-threshold fan control. Compared with LM75BIMM-5/NOPB, MAX6668AUA50+ eliminates firmware dependencies and delivers immediate hardware-based fan activation.
Availability
MAX6668AUA50+ is available at Aetrix Electronics and suitable for notebook computers, PC power supplies, and network switches requiring stable component supply, long-term lifecycle support, and guaranteed automotive-grade temperature qualification.
Supply support for MAX6668AUA50+ 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 MAX6668/MAX6670 product line delivers fully integrated, software-free thermal management solutions targeting fan control in space- and power-constrained systems where reliability and simplicity are critical.
FAQ
What is the exact factory-programmed temperature threshold for MAX6668AUA50+?
The MAX6668AUA50+ has a factory-programmed remote-junction temperature trip threshold of +50°C, with ±2.2°C maximum accuracy over the +40°C to +75°C remote-junction range and -40°C to +125°C ambient operating temperature. This value is laser-trimmed during production and cannot be adjusted externally.
Does MAX6668AUA50+ support remote temperature sensing with discrete transistors?
Yes, MAX6668AUA50+ supports remote temperature sensing using discrete diode-connected transistors such as 2N3904, CMPT3904, or SST3904. The DXP/DXN inputs form a Kelvin-sensing pair requiring <100Ω base resistance and forward voltage compliance (0.25V–0.95V across operating temperature range) for ±2.2°C accuracy.
Can MAX6668AUA50+ drive a +12V fan directly without external components?
Yes, MAX6668AUA50+ integrates a +12V/250mA open-drain power MOSFET on the FANOUT pin. When activated, it sinks up to 250mA with ≤1V saturation voltage - enabling direct connection to standard +12V cooling fans without external transistors, drivers, or level shifters.
What is the hysteresis setting for MAX6668AUA50+ and how is it implemented?
MAX6668AUA50+ features a fixed 8°C hysteresis implemented internally - no external components or pin configuration required. When the remote junction cools to (trip temperature – 8°C), FANOUT turns off, preventing rapid on/off cycling near the +50°C threshold during marginal thermal conditions.
Is MAX6668AUA50+ qualified for automotive applications?
Yes, MAX6668AUA50+ is specified over the full automotive temperature range of -40°C to +125°C and packaged in a qualified 8-pin µMAX package. Its 110µA typical supply current, +3V to +3.6V supply range, and robust remote-diode sensing make it suitable for under-dash infotainment, ADAS module cooling, and engine control unit thermal monitoring.
MAX6668AUA50+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 50°C
- Accuracy:
- ±2.2°C
- Current - Output (Max):
- 250mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /FanOut
- Selectable Hysteresis:
- No
- Features:
- -
- Voltage - Supply:
- 3 V ~ 3.6 V
- Current - Supply:
- 110µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX/uSOP
MAX6668AUA50+ FAQ
1.How can I place an order for MAX6668AUA50+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6668AUA50+ 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 MAX6668AUA50+ reliable?
The price and inventory of MAX6668AUA50+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6668AUA50+ is usually 5 days.
3.What payment methods are accepted for MAX6668AUA50+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6668AUA50+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6668AUA50+?
MAX6668AUA50+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6668AUA50+ 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 MAX6668AUA50+?
For technical support, including MAX6668AUA50+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6668AUA50+ requirements.
6.How does Aetrix verify that MAX6668AUA50+ is sourced from the original manufacturer or authorized distributors?
All MAX6668AUA50+ 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 MAX6668AUA50+ meets industry standards.
7.What is the process for return or replacement of MAX6668AUA50+?
All MAX6668AUA50+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6668AUA50+, 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 MAX6668AUA50+ part is unused and in its original packaging.
Return procedure for MAX6668AUA50+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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