My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6670AUB65+T
- Part No.:
- MAX6670AUB65+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6670AUB65+T.pdf
- Description:
- THERMOSTAT 65DEGC ACT LOW 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6670AUB65+T from Maxim Integrated is a remote-junction thermal switch with integrated +12V/250mA fan driver, factory-programmed trip threshold of +65°C, ±2.2°C max temperature accuracy over -40°C to +125°C, and dual open-drain overtemperature alarms (WARN at +80°C, OT at +95°C). It directly controls cooling fans in notebook computers, network switches, and PC power supplies using an external diode-connected transistor for remote die temperature sensing.
For engineers reviewing the MAX6670AUB65+T datasheet, MAX6670AUB65+T pinout, MAX6670AUB65+T application, or MAX6670AUB65+T equivalent, key selection considerations include its 10-pin µMAX package, pin-selectable hysteresis (4°C/8°C/12°C via HYST), 110µA typical supply current, and dual alarm outputs for staged thermal response in automotive-grade embedded systems.
Technical Context
The MAX6670AUB65+T integrates a precision remote-junction temperature sensor, comparator with programmable hysteresis, open-drain FANOUT power MOSFET (250mA sink), and two independent open-drain digital outputs (WARN and OT). Its internal current source/sink pair (DXP/DXN) measures VBE drop across an external P-N junction to derive temperature with no calibration required.
It operates from +3V to +3.6V only, features a FORCEON input to override thermal control, and uses BiCMOS process technology. The WARN output activates at TTH +15°C (+80°C), OT at TTH +30°C (+95°C), both referenced to the factory-set +65°C threshold and specified over the full automotive range (-40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Trip Threshold | +65°C factory-programmed; defines exact temperature at which FANOUT activates to drive cooling fan. |
| Temperature Accuracy | ±2.2°C max over +40°C to +75°C remote-junction range; ensures reliable fan activation timing under worst-case conditions. |
| FANOUT Drive Capability | +12V/250mA open-drain sink; directly powers standard DC cooling fans without external MOSFET or driver stage. |
| WARN Output Threshold | +80°C (TTH +15°C); provides early warning before critical thermal shutdown, enabling system-level throttling or logging. |
| OT Output Threshold | +95°C (TTH +30°C); triggers hard thermal shutdown signal for safety-critical response in automotive or industrial systems. |
| Hysteresis Options | 4°C (HYST = GND), 8°C (HYST = float), or 12°C (HYST = VDD); prevents fan oscillation during marginal thermal conditions. |
| Supply Current | 110µA typical; enables low-power thermal monitoring in always-on subsystems without significant battery drain. |
Pinout & Package
MAX6670AUB65+T is housed in a 10-pin µMAX package (3.0mm × 3.0mm × 0.8mm), optimized for space-constrained PCB layouts in notebooks and embedded controllers.
| 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 temperature sensing. |
| 2 FORCEON | Fan-Control Input | Active-low override: pulling low forces FANOUT on regardless of sensed temperature, enabling external system-level fan control. |
| 3 DXP | Current Source Positive | Drives constant current into anode of remote diode; requires 2200pF capacitor to DXN for EMI filtering in noisy environments. |
| 4 DXN | Current Sink Negative | Sinks current from cathode of remote diode; internally biased to ~0.7V, forming Kelvin-sensing pair with DXP for accurate VBE measurement. |
| 5 GND | Signal Ground | Reference for logic inputs/outputs and internal circuitry; must be connected to system ground plane with low-impedance path. |
| 6 VDD | Positive Supply | +3V to +3.6V only; bypassing with 1µF capacitor near pin is mandatory to suppress supply noise affecting temperature readings. |
| 7 FANOUT | Fan-Drive Output | Open-drain power MOSFET output; sinks up to 250mA to turn on +12V fan-no external driver needed. |
| 8 WARN | Warning Output | Active-low open-drain; pulls low at +80°C to signal elevated but non-critical temperature condition. |
| 9 HYST | Hysteresis Control | Three-level logic input: GND=4°C, float=8°C, VDD=12°C; sets thermal deadband to match system cooling dynamics. |
| 10 OT | Overtemperature Output | Active-low open-drain; pulls low at +95°C to initiate emergency shutdown or fault reporting in safety-critical applications. |
Key Features
| Feature | Design Value |
|---|---|
| +12V/250mA integrated fan driver | Eliminates need for external power MOSFET or gate driver, reducing BOM count and layout complexity in compact thermal management designs. |
| Pin-selectable hysteresis (4°C/8°C/12°C) | Allows tuning of thermal deadband to match specific airflow characteristics and acoustic requirements without firmware changes. |
| Dual overtemperature alarm outputs (WARN/OT) | Enables staged thermal response: WARN for proactive throttling, OT for immediate hardware shutdown-critical for automotive ASIL-B compliance paths. |
| No calibration required | Factory-trimmed sensor and comparator deliver ±2.2°C accuracy out-of-box, removing production test steps and calibration infrastructure costs. |
| Automotive-grade operating range | Specified from -40°C to +125°C ambient, supporting under-hood and industrial control applications where extended temperature reliability is mandatory. |
Applications
| Notebook Computers | Network Switches |
|---|---|
Use Scenario: Thermal management of CPU/GPU die in ultra-thin laptop chassis with limited airflow. IC Role / Device Role / Timing Role: Remote-junction temperature switch that monitors integrated diode on processor die and drives cooling fan on/off based on real-time junction temperature. Use Value: Prevents thermal throttling by activating fan precisely at +65°C, while WARN (+80°C) triggers OS-level performance scaling before OT (+95°C) initiates forced shutdown. |
Use Scenario: Overheat protection for high-density Ethernet switch ASICs operating in unventilated rack enclosures. IC Role / Device Role / Timing Role: Standalone thermal supervisor that senses remote diode on switch fabric IC and independently controls chassis fan speed via on/off duty cycle. Use Value: Maintains ASIC junction below 105°C using +65°C trip point and 8°C hysteresis, with OT output signaling critical failure to management controller for port shutdown. |
| PC Power Supplies | Laboratory Instruments |
Use Scenario: Fan control in 80 PLUS-certified ATX PSUs where efficiency and acoustic noise are tightly constrained. IC Role / Device Role / Timing Role: Integrated fan driver that replaces discrete transistor + comparator solution, reducing component count and improving thermal response consistency. Use Value: Enables quiet operation via precise +65°C activation and 12°C hysteresis (HYST = VDD), minimizing fan cycling while ensuring MOSFETs stay within SOA limits. |
Use Scenario: Temperature supervision in benchtop oscilloscopes and spectrum analyzers requiring stable analog front-end performance. IC Role / Device Role / Timing Role: Remote thermal switch monitoring temperature-sensitive RF amplifiers and ADC reference circuits via discrete 2N3904 sensing transistor. Use Value: Guarantees measurement accuracy by preventing drift-WARN output alerts operator at +80°C before thermal gradients affect gain flatness or offset stability. |
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 |
|---|---|---|---|
| MAX6668AUA65+T | 8-pin µMAX, fixed 8°C hysteresis, no WARN/OT outputs, same +65°C threshold and +12V/250mA FANOUT. | Lacks staged alarm capability; suitable only for basic on/off fan control without warning or shutdown signaling. | Select when dual alarms are unnecessary and board space allows 8-pin footprint reduction. |
| LM57CIMM-65/NOPB | Adjustable threshold (via resistor divider), no integrated fan driver, only analog output and single digital alert, 6-pin SOT-23. | Requires external MOSFET driver and threshold programming; supports flexible trip points but adds design complexity. | Select when variable threshold is required and system already includes fan driver circuitry. |
Compared with MAX6668AUA65+T, the MAX6670AUB65+T adds WARN/OT outputs and hysteresis selectability at the cost of two extra pins; compared with LM57CIMM-65/NOPB, it delivers complete fan-control integration but sacrifices threshold adjustability-making it optimal for fixed-threshold, space-constrained, safety-aware designs.
Availability
MAX6670AUB65+T is available at Aetrix Electronics and suitable for notebook computers, network switches, and PC power supplies requiring stable component supply, automotive-grade temperature reliability, and integrated fan-driver functionality.
Supply support for MAX6670AUB65+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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX6670AUB65+T belongs to Maxim's remote temperature switch product line, designed specifically for autonomous, software-free thermal management in space- and power-constrained embedded systems.
FAQ
What is the factory-programmed temperature threshold for the MAX6670AUB65+T?
The MAX6670AUB65+T has a factory-programmed fan activation threshold of +65°C. This value is laser-trimmed during production and cannot be adjusted externally. The WARN output asserts at +80°C (TTH +15°C) and OT at +95°C (TTH +30°C), both referenced strictly to this fixed +65°C baseline. No external components or configuration registers modify this threshold.
How does the HYST pin configure hysteresis on the MAX6670AUB65+T?
The HYST pin on the MAX6670AUB65+T selects hysteresis via three logic states: connect to GND for 4°C, leave floating for 8°C, or connect to VDD for 12°C. This adjusts the temperature deadband between fan turn-on and turn-off to prevent rapid cycling in marginally heated environments. The MAX6670AUB65+T does not support intermediate or analog hysteresis values-only these three discrete settings are valid and tested.
Can the MAX6670AUB65+T drive a 24V fan?
No, the MAX6670AUB65+T FANOUT pin is rated for absolute maximum voltage of +15V and is specified for operation with fans up to +12V nominal. Driving a 24V fan exceeds the device's FANOUT-to-GND rating and risks permanent damage. The MAX6670AUB65+T must be used only with +12V or lower fans; higher-voltage fan control requires an external level-shifting driver stage.
What remote sensing components are compatible with the MAX6670AUB65+T?
The MAX6670AUB65+T is compatible with discrete diode-connected transistors such as 2N3904, CMPT3904, SST3904, and KST3904-TF, as well as on-die temperature diodes in CPUs and ASICs. These must meet forward voltage specifications: >0.25V at 10µA (high-temp limit) and <0.95V at 100µA (low-temp limit), with base resistance <100Ω. Large power transistors or devices outside these VF ranges will cause inaccurate readings in the MAX6670AUB65+T.
Does the MAX6670AUB65+T require external passive components for basic operation?
Yes-the MAX6670AUB65+T requires a 1µF bypass capacitor between VDD and GND placed adjacent to the package, and a 2200pF capacitor between DXP and DXN for noise filtering. These are mandatory per the datasheet: omitting the VDD bypass causes supply noise-induced temperature errors, and skipping the DXP/DXN capacitor degrades accuracy in electrically noisy environments like motherboard applications.
MAX6670AUB65+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
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 65°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
MAX6670AUB65+T FAQ
1.How can I place an order for MAX6670AUB65+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6670AUB65+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 MAX6670AUB65+T reliable?
The price and inventory of MAX6670AUB65+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6670AUB65+T is usually 5 days.
3.What payment methods are accepted for MAX6670AUB65+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6670AUB65+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6670AUB65+T?
MAX6670AUB65+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6670AUB65+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 MAX6670AUB65+T?
For technical support, including MAX6670AUB65+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6670AUB65+T requirements.
6.How does Aetrix verify that MAX6670AUB65+T is sourced from the original manufacturer or authorized distributors?
All MAX6670AUB65+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 MAX6670AUB65+T meets industry standards.
7.What is the process for return or replacement of MAX6670AUB65+T?
All MAX6670AUB65+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6670AUB65+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 MAX6670AUB65+T part is unused and in its original packaging.
Return procedure for MAX6670AUB65+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6670AUB65+T Tags
-
N34TS04MT3ETG
onsemi
-
MCP9501PT-095E/OT
Microchip Technology
-
TMP390AQDRLRQ1
Texas Instruments
-
TC6501P125VCTTR
Microchip Technology
-
LM26CIM5-RPA/NOPB
Texas Instruments
-
MCP9509HT-E/OT
Microchip Technology
-
MCP9509CT-E/OT
Microchip Technology
-
MCP9510HT-E/CH
Microchip Technology
-
TC622VOA
Microchip Technology
-
TC620CEOA
Microchip Technology
-
TC622VAT
Microchip Technology
-
MAX6509HAUK+T
Analog Devices Inc./Maxim Integrated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
