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Analog Devices Inc./Maxim Integrated MAX6665ASA60
- Part No.:
- MAX6665ASA60
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MAX6665ASA60.pdf
- Description:
- FAN CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:8,552
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Product details
Overview
MAX6665ASA60 from Maxim Integrated is a thermal fan controller IC with an integrated 250mA low-side power transistor, factory-programmed +60°C activation threshold, ±3°C max trip accuracy, and pin-selectable 1°C/4°C/8°C hysteresis. It drives cooling fans up to 24V/250mA in servers, desktop PCs, and lab instruments.
For engineers reviewing the MAX6665ASA60 datasheet, MAX6665ASA60 pinout, MAX6665ASA60 application, or MAX6665ASA60 equivalent, this page delivers verified thermal trip behavior, FANOUT drive capability, WARN/OT overtemperature signaling, and SO-EP package integration details for reliable thermal management design.
Technical Context
The MAX6665ASA60 implements a die-temperature-sensing comparator with factory-trimmed threshold and configurable hysteresis via the HYST pin (floating = 1°C, GND = 4°C, VDD = 8°C). Its internal N-channel MOSFET switches the fan on the low side, supporting 4.5V–24V fan supplies independent of its 2.7V–5.5V logic supply.
Two open-drain outputs-WARN (active at +15°C above threshold) and OT (active at +30°C above threshold)-provide staged thermal alerts. FANON delivers active-high push-pull indication of fan state, while FORCEON enables external override of thermal control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Activation Threshold | +60°C factory-programmed; enables precise thermal triggering without external calibration. |
| Threshold Accuracy | ±3°C maximum error; ensures predictable fan-on timing across -40°C to +125°C operating range. |
| FANOUT Drive Capability | 250mA continuous at VFANOUT < 0.6V; supports common 5V–12V, 100–250mA cooling fans directly. |
| Hysteresis Options | 1°C (HYST floating), 4°C (HYST = GND), or 8°C (HYST = VDD); prevents fan chattering during marginal temperature conditions. |
| Supply Current | 65µA typical at no load; minimizes system power overhead in always-on thermal monitoring. |
| WARN / OT Thresholds | +15°C and +30°C above fan threshold; provides two-stage thermal warning and shutdown signaling. |
| Operating Voltage Range | VDD = 2.7V–5.5V; compatible with 3.3V and 5V logic rails; fan supply independent up to 24V. |
Pinout & Package
MAX6665ASA60 is housed in an 8-pin SOIC with exposed paddle (SO-EP), providing enhanced thermal dissipation and low-impedance ground connection via soldered EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, Exposed Paddle) | Ground reference | Common return for logic, fan driver, and thermal path; EP must be soldered to PCB ground plane. |
| FORCEON (Pin 2) | External fan enable input | Active-low override: forces FANOUT on regardless of temperature; enables system-level fan control. |
| HYST (Pin 3) | Hysteresis configuration | Three-state input: float = 1°C, GND = 4°C, VDD = 8°C; sets thermal deadband to match cooling dynamics. |
| FANON (Pin 4) | Fan status indicator | Push-pull output high when fan is active (thermal or forced); simplifies host MCU monitoring without pull-ups. |
| OT (Pin 5) | Overtemperature shutdown | Active-low open-drain output triggered at +30°C above threshold; signals critical thermal fault requiring immediate action. |
| WARN (Pin 6) | Overtemperature warning | Active-low open-drain output triggered at +15°C above threshold; enables early thermal mitigation before shutdown. |
| VDD (Pin 7) | Logic supply input | 2.7V–5.5V supply; requires local 1µF tantalum bypass capacitor to suppress ground bounce from fan switching. |
| FANOUT (Pin 8) | Fan driver output | N-channel MOSFET drain connected to fan low-side; rated for 250mA continuous, 400mA absolute max. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 250mA fan switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout area in space-constrained systems. |
| Factory-programmed +60°C threshold | Guarantees accurate thermal trip point without calibration; avoids production test overhead and field drift. |
| Dual overtemperature outputs (WARN/OT) | Enables tiered response: WARN initiates throttling or airflow increase; OT triggers hard shutdown for safety-critical systems. |
| Pin-selectable hysteresis | Allows tuning thermal deadband to match system thermal mass and acoustic requirements without firmware changes. |
| Low 65µA quiescent current | Minimizes standby power in always-on thermal monitors; extends battery life in portable instrumentation. |
Applications
| Server Thermal Management | Desktop PC Fan Control |
|---|---|
Use Scenario: Monitors CPU and VRM temperatures in 1U/2U rack servers to dynamically activate redundant fans. IC Role / Device Role / Timing Role: Die-temperature-sensing fan controller with fail-safe WARN/OT outputs for hardware-level thermal protection. Use Value: Prevents thermal runaway by activating fans at +60°C and initiating graceful shutdown at +90°C (60°C + 30°C), meeting ASHRAE A3/A4 environmental compliance. | Use Scenario: Regulates case and GPU heatsink fans in consumer desktop motherboards with variable acoustic profiles. IC Role / Device Role / Timing Role: Standalone thermal switch with user-configurable hysteresis to reduce fan cycling noise. Use Value: 4°C hysteresis (HYST = GND) balances cooling responsiveness and acoustic comfort; FANON signal feeds BIOS fan speed reporting. |
| Laboratory Instrument Cooling | PC Power Supply Monitoring |
Use Scenario: Controls forced-air cooling for precision analog circuitry in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Low-power thermal supervisor ensuring stable bias points under varying ambient conditions. Use Value: 65µA supply current avoids self-heating interference with sensitive measurements; ±3°C accuracy maintains calibration integrity. | Use Scenario: Detects overheating in ATX PSUs due to capacitor aging or airflow blockage, triggering system halt before component failure. IC Role / Device Role / Timing Role: Independent hardware-based thermal cutoff co-located with primary DC-DC stage. Use Value: OT output directly disables PSU PWM controller via optocoupler; eliminates reliance on software-based thermal polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar thermal fan control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75BIMM/NOPB | Temperature sensor only (I²C output); no integrated fan driver or WARN/OT outputs. | Requires external MCU and MOSFET for fan control; adds latency and firmware complexity. | Select when system already includes microcontroller-based thermal management and needs only sensing. |
| ADT7470ARQZ | Multi-channel fan controller with RPM monitoring, PWM control, and SMBus interface; higher integration but larger footprint and cost. | Supports closed-loop PWM fan control and multi-zone monitoring; suited for high-end workstations. | Select when precise RPM feedback, multiple fan zones, or digital bus control are required. |
Compared with LM75BIMM/NOPB and ADT7470ARQZ, the MAX6665ASA60 delivers minimal-footprint, zero-firmware thermal protection with guaranteed +60°C trip point and hardware-level WARN/OT escalation-ideal for cost-sensitive, safety-critical fan control where simplicity and reliability are paramount.
Availability
MAX6665ASA60 is available at Aetrix Electronics and suitable for server thermal management, desktop PC fan control, and laboratory instrument cooling requiring stable component supply and long-term industrial availability.
Supply support for MAX6665ASA60 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 industrial, computing, and communications applications.
The MAX6665ASA60 belongs to Maxim's thermal management product line, engineered for autonomous, hardware-based fan control in systems where firmware-independent thermal safety is mandatory.
FAQ
What is the exact factory-programmed temperature threshold for MAX6665ASA60?
The MAX6665ASA60 has a factory-programmed fan activation threshold of +60°C, with a maximum error of ±3°C across its full -40°C to +125°C operating range. This value is laser-trimmed during production and does not require external calibration. The MAX6665ASA60's threshold is fixed and cannot be adjusted via pins or registers.
How does the HYST pin configure hysteresis on the MAX6665ASA60?
The HYST pin on the MAX6665ASA60 selects hysteresis in three states: unconnected (1°C), tied to GND (4°C), or tied to VDD (8°C). This adjusts the temperature deadband between fan turn-on and turn-off to prevent oscillation near the +60°C threshold. Self-heating from fan current adds ~1.6°C (125mA fan) to ~7.7°C (250mA fan) to the effective hysteresis.
Can MAX6665ASA60 drive a 24V fan with 250mA current?
Yes, the MAX6665ASA60's FANOUT pin supports continuous 250mA current at VFANOUT < 0.6V and withstands up to 28V. When driving a 24V fan, ensure the fan's negative terminal connects to FANOUT and its positive terminal to the 24V rail. The MAX6665ASA60's logic supply (VDD) remains independent at 2.7V–5.5V.
What is the function of the WARN and OT outputs on MAX6665ASA60?
WARN is an active-low open-drain output triggered when die temperature reaches +15°C above the +60°C threshold (+75°C), signaling thermal stress. OT is also active-low open-drain, activated at +30°C above threshold (+90°C), indicating critical overtemperature requiring immediate shutdown. Both require external pull-up resistors and drive separate system alert paths.
Does MAX6665ASA60 require external components for basic operation?
No-MAX6665ASA60 operates autonomously with no external passive components required for core functionality. A 1µF tantalum capacitor from VDD to GND is mandatory for noise suppression, and pull-up resistors are needed for WARN and OT. The exposed paddle must be soldered to the PCB ground plane for thermal and electrical performance.
MAX6665ASA60 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 60°C
- Accuracy:
- ±3°C
- Current - Output (Max):
- 250mA
- Output Type:
- Open Drain, Push-Pull
- Output:
- Active High, Active Low
- Output Function:
- FanOn, /FanOut, /OverTemp, /Warn
- Selectable Hysteresis:
- Yes
- Features:
- -
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 65µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC-EP
MAX6665ASA60 FAQ
1.How can I place an order for MAX6665ASA60 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6665ASA60 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 MAX6665ASA60 reliable?
The price and inventory of MAX6665ASA60 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6665ASA60 is usually 5 days.
3.What payment methods are accepted for MAX6665ASA60?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6665ASA60 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6665ASA60?
MAX6665ASA60 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6665ASA60 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 MAX6665ASA60?
For technical support, including MAX6665ASA60 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6665ASA60 requirements.
6.How does Aetrix verify that MAX6665ASA60 is sourced from the original manufacturer or authorized distributors?
All MAX6665ASA60 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 MAX6665ASA60 meets industry standards.
7.What is the process for return or replacement of MAX6665ASA60?
All MAX6665ASA60 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6665ASA60, 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 MAX6665ASA60 part is unused and in its original packaging.
Return procedure for MAX6665ASA60:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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