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Analog Devices Inc./Maxim Integrated MAX6670AUB40+
- Part No.:
- MAX6670AUB40+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6670AUB40+.pdf
- Description:
- THERMOSTAT 40DEGC ACT LOW 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,743
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Product details
Overview
MAX6670AUB40+ from Maxim Integrated is a remote-junction thermal switch with integrated +12V/250mA fan driver, factory-programmed +40°C trip threshold, pin-selectable 4°C/8°C/12°C hysteresis, and dual open-drain overtemperature alarms (WARN at +15°C, OT at +30°C above trip). It operates from +3V to +3.6V and targets automotive-grade thermal management in PC power supplies and network switches.
For engineers reviewing the MAX6670AUB40+ datasheet, MAX6670AUB40+ pinout, MAX6670AUB40+ application, or MAX6670AUB40+ equivalent, key selection criteria include remote diode interface compatibility, open-drain WARN/OT alarm timing relative to fan activation, HYST logic-level hysteresis configuration, and PGND-referenced 250mA FANOUT drive capability under -40°C to +125°C operation.
Technical Context
The MAX6670AUB40+ integrates a precision remote-junction temperature sensor with a comparator whose output controls an internal power MOSFET on the FANOUT pin. Its DXP/DXN inputs bias and measure voltage drop across an external diode-connected transistor, converting ΔVBE to temperature with ±1°C typical accuracy over +40°C to +75°C remote junction range.
It features three dedicated open-drain outputs: FANOUT (250mA sink), WARN (active-low at +15°C above trip), and OT (active-low at +30°C above trip); plus FORCEON (override control) and HYST (3-state hysteresis select). All logic inputs tolerate 0.2×VDD to 0.8×VDD thresholds, and supply current remains ≤200µA typical across -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Trip Threshold | +40°C factory-programmed; defines exact temperature at which FANOUT activates cooling fan |
| Hysteresis Options | Pin-selectable: 4°C (HYST = GND), 8°C (HYST = float), 12°C (HYST = VDD); prevents fan oscillation during thermal recovery |
| FANOUT Drive Capability | +12V-rated, 250mA sink current; directly drives small cooling fans without external MOSFET or driver stage |
| WARN Output Trigger | Active-low at +15°C above fan trip threshold; provides early warning before critical thermal shutdown |
| OT Output Trigger | Active-low at +30°C above fan trip threshold; signals system-level thermal emergency requiring immediate action |
| Supply Voltage Range | +3.0V to +3.6V; matches standard 3.3V rail with 10% tolerance; excludes operation outside this band |
| Operating Temperature | -40°C to +125°C ambient; fully specified for automotive and industrial environments without derating |
Pinout & Package
MAX6670AUB40+ is housed in a 10-pin µMAX package (3.0mm × 3.0mm × 0.8mm, 0.5mm pitch), with exposed PGND pad for thermal and power integrity. Pin 1 is PGND (power ground for FANOUT MOSFET), and pin numbering follows standard µMAX top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PGND | Power Ground | Return path for FANOUT MOSFET current; must be low-impedance connection to system power ground |
| 2 - FORCEON | Fan Override Input | Active-low logic input; forces FANOUT ON regardless of remote temperature reading |
| 3 - DXP | Current Source Positive | Biases anode of remote diode; requires 2200pF capacitor to DXN for noise filtering |
| 4 - DXN | Current Sink Negative | Connects to cathode of remote diode; internally biased to ~0.7V below DXP |
| 5,7 - GND | Analog Ground | Reference for internal circuitry; separate from PGND to minimize noise coupling into sensing path |
| 6 - VDD | Power Supply | +3.0V to +3.6V supply input; requires local 1µF bypass capacitor to GND |
| 8 - FANOUT | Fan Drive Output | Open-drain N-channel MOSFET output; sinks up to 250mA to +12V fan load |
| 9 - HYST | Hysteresis Control | Three-level logic input: GND=4°C, float=8°C, VDD=12°C; sets comparator hysteresis window |
| 10 - OT | Overtemperature Output | Active-low open-drain alarm; asserts when remote junction exceeds +70°C (+40°C +30°C) |
| - - WARN | Warning Output | Active-low open-drain alarm; asserts when remote junction exceeds +55°C (+40°C +15°C) |
Key Features
| Feature | Design Value |
|---|---|
| +12V/250mA integrated fan driver | Eliminates need for external power MOSFET or gate driver; reduces BOM count and PCB area |
| Pin-selectable hysteresis (4°C/8°C/12°C) | Enables precise tuning of fan on/off cycling behavior to match thermal mass and acoustic requirements |
| Dual independent overtemperature alarms (WARN/OT) | Supports tiered thermal response: warning at +15°C, shutdown at +30°C beyond trip point |
| No calibration required | Factory-trimmed sensor and comparator deliver ±1°C typical accuracy without user adjustment |
| Remote P-N junction sensing | Directly interfaces with CPU diode sensors or discrete 2N3904/SST3904 transistors for accurate die temperature monitoring |
Applications
| PC Power Supplies | Network Switches |
|---|---|
|
Use Scenario: Regulated +12V output stage in ATX PSUs where MOSFET and rectifier heating demands dynamic fan speed control. IC Role / Device Role / Timing Role: Remote temperature switch that monitors heatsink-mounted 2N3904 and triggers +12V fan via FANOUT when core temperature exceeds +40°C. Use Value: Prevents thermal runaway by activating cooling before regulator ICs exceed 105°C junction limit; WARN/OT outputs feed PSU supervisor IC for graceful shutdown. |
Use Scenario: High-port-density Ethernet switch with ASICs generating localized hotspots on backplane PCB. IC Role / Device Role / Timing Role: Monitors remote diode on switch controller die and drives chassis fan through FANOUT; HYST set to 8°C to avoid fan flutter during transient loads. Use Value: Maintains ASIC junction <85°C under sustained 10Gbps traffic; OT signal halts packet forwarding if temperature breaches +70°C. |
| Notebook Motherboards | Laboratory Instruments |
|
Use Scenario: Space-constrained notebook baseboard where CPU VRM and chipset share compact heatsink. IC Role / Device Role / Timing Role: Uses integrated DXP/DXN to read CPU's on-die diode; FANOUT drives 5V/120mA blower; FORCEON tied to EC for software-initiated cooling. Use Value: Enables silent operation below +40°C; +15°C WARN alerts EC to throttle CPU clocks preemptively before fan spins. |
Use Scenario: Benchtop oscilloscope with FPGA-based acquisition engine dissipating >3W near analog front-end. IC Role / Device Role / Timing Role: Mounted adjacent to FPGA; senses discrete SST3904 on thermal pad; OT output disables high-voltage analog section at +70°C. Use Value: Guarantees measurement accuracy drift <0.1% over operating range; prevents calibration drift caused by thermal gradient across ADC reference. |
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 |
|---|---|---|---|
| MAX6668AUA40+ | 8-pin µMAX, fixed 8°C hysteresis, no WARN/OT outputs, identical +40°C trip and +12V/250mA FANOUT | Lacks dual alarm outputs; suitable only where single-stage fan control suffices without warning or shutdown signaling | Select when board space is constrained and overtemperature escalation logic resides externally |
| LM96000CIMTX/NOPB | 10-pin MSOP, digital SMBus interface, programmable trip/hysteresis, no integrated fan driver | Requires external MOSFET driver and microcontroller coordination; supports multi-zone monitoring and logging | Select when system needs configurable thresholds, remote diagnostics, or multiple sensor inputs |
Compared with MAX6668AUA40+, MAX6670AUB40+ adds WARN/OT alarms and selectable hysteresis at the cost of two extra pins; compared with LM96000CIMTX/NOPB, it delivers simpler "drop-in" fan control without firmware dependency but lacks configurability and digital interface.
Availability
MAX6670AUB40+ is available at Aetrix Electronics and suitable for PC power supplies, network switches, notebook motherboards, and laboratory instruments requiring stable component supply across automotive temperature ranges and long production lifecycles.
Supply support for MAX6670AUB40+ 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 self-contained thermal management solutions with integrated fan drivers and remote diode sensing, targeting systems needing reliable, software-free cooling control.
FAQ
What is the exact factory-programmed temperature threshold for MAX6670AUB40+?
The MAX6670AUB40+ has a factory-programmed fan activation threshold of exactly +40°C. This value is laser-trimmed during production and is not user-adjustable. The device asserts FANOUT when the remote P-N junction temperature exceeds +40°C, and the WARN and OT outputs trigger at +55°C and +70°C respectively. This threshold is guaranteed across the full -40°C to +125°C operating ambient range.
How does the HYST pin configure hysteresis on MAX6670AUB40+?
On the MAX6670AUB40+, the HYST pin selects hysteresis via three logic states: connect HYST to GND for 4°C hysteresis, leave it floating for 8°C hysteresis, or tie it to VDD for 12°C hysteresis. This determines the temperature delta between fan turn-on (+40°C) and turn-off (+36°C, +32°C, or +28°C). The setting directly affects fan cycling frequency and acoustic performance in thermally dynamic systems.
Can MAX6670AUB40+ drive a +12V fan with 300mA load current?
No, MAX6670AUB40+ cannot reliably drive a 300mA fan load. Its FANOUT pin is rated for a maximum sink current of 250mA at VFANOUT ≤ 1.0V (typical) and VDD = +3.3V. Exceeding 250mA risks violating VOL specification, increasing junction temperature, and triggering thermal shutdown at 170°C. For 300mA fans, use an external MOSFET driven by MAX6670AUB40+'s open-drain FANOUT signal.
What remote sensing components are compatible with MAX6670AUB40+?
MAX6670AUB40+ is compatible with discrete diode-connected transistors such as 2N3904, SST3904, KST3904-TF, and FMMT3904CT-ND, as well as on-die diodes in CPUs and ASICs. The sensing element must exhibit forward voltage >0.25V at 10µA (max temp) and <0.95V at 100µA (min temp), with base resistance <100Ω. Large power transistors or devices with poor VBE consistency are incompatible.
Does MAX6670AUB40+ require external passive components for basic operation?
Yes, MAX6670AUB40+ requires two mandatory external components: a 2200pF capacitor between DXP and DXN for noise filtering, and a 1µF ceramic bypass capacitor from VDD to GND placed adjacent to the IC. These are specified in the Typical Operating Circuit and Functional Diagrams. Omitting either compromises temperature accuracy or risks supply instability, especially in electrically noisy environments like PC motherboards.
MAX6670AUB40+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 40°C
- Accuracy:
- ±2.2°C
- Current - Output (Max):
- 250mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /FanOut, /OverTemp, /Warn
- Selectable Hysteresis:
- Yes
- 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:
- 10-uMAX/uSOP
MAX6670AUB40+ FAQ
1.How can I place an order for MAX6670AUB40+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6670AUB40+ 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 MAX6670AUB40+ reliable?
The price and inventory of MAX6670AUB40+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6670AUB40+ is usually 5 days.
3.What payment methods are accepted for MAX6670AUB40+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6670AUB40+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6670AUB40+?
MAX6670AUB40+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6670AUB40+ 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 MAX6670AUB40+?
For technical support, including MAX6670AUB40+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6670AUB40+ requirements.
6.How does Aetrix verify that MAX6670AUB40+ is sourced from the original manufacturer or authorized distributors?
All MAX6670AUB40+ 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 MAX6670AUB40+ meets industry standards.
7.What is the process for return or replacement of MAX6670AUB40+?
All MAX6670AUB40+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6670AUB40+, 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 MAX6670AUB40+ part is unused and in its original packaging.
Return procedure for MAX6670AUB40+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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