My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6670AUB45+T
- Part No.:
- MAX6670AUB45+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6670AUB45+T.pdf
- Description:
- THERMOSTAT 45DEGC ACT LOW 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,649
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6670AUB45+T from Maxim Integrated is a remote-junction thermal switch with integrated +12V/250mA fan driver, factory-programmed +45°C activation threshold, ±2.2°C max temperature accuracy (TRJ = +40°C to +75°C), and pin-selectable 4°C/8°C/12°C hysteresis - used for autonomous cooling control in notebook computers and network switches.
For engineers reviewing the MAX6670AUB45+T datasheet, MAX6670AUB45+T pinout, MAX6670AUB45+T application, or MAX6670AUB45+T equivalent, key selection factors include its open-drain WARN/OT overtemperature alarms (+15°C/+30°C offsets), FORCEON override input, 110µA typical supply current, and 10-pin µMAX package compatibility with discrete P-N junction sensing.
Technical Context
The MAX6670AUB45+T integrates a BiCMOS remote diode temperature sensor, comparator with programmable hysteresis, and high-current open-drain FANOUT MOSFET driver. It operates exclusively from +3V to +3.6V and supports automotive-grade operation from −40°C to +125°C ambient.
Its dual alarm outputs-WARN (active-low at TRJ = TTH +15°C) and OT (active-low at TRJ = TTH +30°C)-provide staged thermal response without external logic. The HYST pin accepts three-level logic (GND/VDD/floating) to select hysteresis values, while FORCEON enables external fan activation independent of temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fan Threshold | +45°C factory-programmed trip point for FANOUT activation |
| Temperature Accuracy | ±2.2°C max error over +40°C to +75°C remote junction range |
| Hysteresis Options | 4°C (HYST = GND), 8°C (HYST = floating), or 12°C (HYST = VDD) |
| FANOUT Drive Capability | 250mA sink current at ≤1V drop - directly drives +12V fans without external transistor |
| Supply Current | 110µA typical quiescent current - enables low-power thermal monitoring |
| Alarm Outputs | Open-drain WARN (TTH +15°C) and OT (TTH +30°C) for cascaded thermal response |
| Operating Voltage | +3V to +3.6V only - incompatible with 5V systems without level-shifting |
| Package | 10-pin µMAX (3.0mm × 3.0mm × 0.8mm) - space-constrained PCB deployment |
Pinout & Package
MAX6670AUB45+T uses a 10-pin µMAX package (3.0mm × 3.0mm, 0.8mm height) with exposed pad for thermal dissipation. Pin 1 is PGND; pin numbering follows standard µMAX top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Return path for FANOUT MOSFET - must be low-impedance connection to minimize voltage rise under 250mA load |
| 2 (FORCEON) | Fan Control Input | Active-low override: pulling low forces FANOUT on regardless of sensed temperature |
| 3 (DXP) | Current Source Positive | Drives 10µA current into anode of remote diode-connected transistor - requires 2200pF noise filter to DXN |
| 4 (DXN) | Current Sink Negative | Connects to cathode of remote diode - internally biased to ~0.7V; forms Kelvin-sensing pair with DXP |
| 5, 7 (GND) | Analog/Digital Ground | Reference for internal circuitry - separate from PGND to isolate noise coupling into temperature measurement |
| 6 (VDD) | Power Supply | +3V to +3.6V only - bypass with 1µF capacitor placed adjacent to pin |
| 8 (FANOUT) | Fan Driver Output | Open-drain power MOSFET output - sinks up to 250mA to drive +12V fans directly |
| 9 (HYST) | Hysteresis Control | Three-level logic input: GND = 4°C, floating = 8°C, VDD = 12°C - sets thermal deadband to prevent fan oscillation |
| 10 (OT) | Overtemperature Output | Active-low open-drain signal asserted when TRJ ≥ TTH +30°C - triggers system shutdown or fault logging |
| - (WARN) | Warning Output | Pin 2 on MAX6670 die (labeled WARN in functional diagram); active-low at TRJ ≥ TTH +15°C - alerts before critical thermal event |
Key Features
| Feature | Design Value |
|---|---|
| +12V/250mA integrated fan driver | Eliminates need for external MOSFET or driver IC - reduces BOM count and layout area |
| Pin-selectable hysteresis (4°C/8°C/12°C) | Enables tuning of thermal deadband to match system cooling dynamics and acoustic requirements |
| Factory-programmed +45°C threshold | Guarantees precise activation point without calibration - simplifies production test and qualification |
| WARN and OT dual alarm outputs | Provides two-stage thermal response: warning at +15°C above trip, shutdown at +30°C - supports fail-safe design |
| Remote P-N junction sensing | Measures die temperature of CPUs or discrete transistors (e.g., 2N3904) - delivers accurate junction-level thermal feedback |
| 110µA typical supply current | Minimizes standby power draw in always-on thermal monitoring applications |
Applications
| Notebook Computers | Network Switches |
|---|---|
|
Use Scenario: Thermal management of CPU and chipset in space-constrained laptop chassis. IC Role / Device Role / Timing Role: Remote-junction thermal switch that autonomously activates cooling fan when processor junction exceeds +45°C. Use Value: Prevents thermal throttling by triggering fan before CPU reaches critical junction temperature - maintains sustained performance without software intervention. |
Use Scenario: Overtemperature protection for ASICs and power converters in 1U rack-mounted Ethernet switches. IC Role / Device Role / Timing Role: Standalone fan controller using discrete 2N3904 as remote sensor near hot components. Use Value: Enables immediate fan response to localized heating events - avoids ASIC thermal shutdown during burst traffic loads. |
| PC Power Supplies | Laboratory Instruments |
|
Use Scenario: Fan speed control based on internal MOSFET and transformer temperature in ATX PSUs. IC Role / Device Role / Timing Role: FANOUT-driven +12V fan activated at +45°C, with WARN signaling +60°C and OT asserting +75°C. Use Value: Provides graded thermal response: warning at mid-range overtemp, hard shutdown at failure condition - improves PSU reliability and safety certification compliance. |
Use Scenario: Temperature-triggered cooling for precision analog front-ends in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Remote diode sensor mounted on amplifier IC substrate, driving fan via MAX6670AUB45+T FANOUT. Use Value: Maintains analog signal integrity by limiting thermal drift - ensures stable DC offset and gain over operating time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote thermal switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6668AUA45+ | 8-pin µMAX, fixed 8°C hysteresis, no WARN/OT outputs | Lacks staged alarms; suitable only where single-threshold fan control suffices | Select when board space allows smaller package and dual-alarm functionality is unnecessary |
| LM75BIMM-3/NOPB | I²C digital temperature sensor with programmable thresholds - no integrated fan driver | Requires external MOSFET driver and microcontroller firmware for fan control | Select when system already includes I²C host and flexible, software-configurable thermal policy is required |
Compared with MAX6668AUA45+, the MAX6670AUB45+T adds WARN/OT alarms and hysteresis selection but uses a larger 10-pin package; compared with LM75BIMM-3/NOPB, it delivers autonomous analog fan control without firmware dependency but lacks digital interface or user-adjustable thresholds.
Availability
MAX6670AUB45+T is available at Aetrix Electronics and suitable for notebook computers, network switches, and PC power supplies requiring stable component supply, automotive-grade temperature operation, and autonomous thermal management.
Supply support for MAX6670AUB45+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 industrial, automotive, and computing applications.
The MAX6670AUB45+T belongs to Maxim's remote temperature switch product line, engineered specifically for self-contained, software-free thermal management in space- and power-constrained systems.
FAQ
What is the exact factory-programmed temperature threshold for MAX6670AUB45+T?
The MAX6670AUB45+T has a factory-programmed fan activation threshold of +45°C. This value is laser-trimmed during production and guaranteed across the full automotive temperature range (−40°C to +125°C ambient). The threshold applies to the remote P-N junction temperature (TRJ), not ambient or case temperature, and exhibits ±2.2°C maximum error over the +40°C to +75°C TRJ range specified in the MAX6670AUB45+T datasheet.
Does MAX6670AUB45+T support 5V operation?
No, MAX6670AUB45+T operates exclusively from +3V to +3.6V. Its absolute maximum VDD rating is +6V, but functional operation outside the +3V to +3.6V range is not characterized or guaranteed. Attempting to power MAX6670AUB45+T from 5V may cause improper temperature measurement, incorrect hysteresis behavior, or permanent damage. A dedicated 3.3V LDO regulator is required for reliable MAX6670AUB45+T operation.
How does the HYST pin configure hysteresis on MAX6670AUB45+T?
The HYST pin on MAX6670AUB45+T accepts three logic states to set hysteresis: connect to GND for 4°C, leave floating for 8°C, or connect to VDD for 12°C. This selection determines the temperature deadband between fan turn-on and turn-off - e.g., with +45°C threshold and 8°C hysteresis, the fan turns off when TRJ drops to +37°C. The MAX6670AUB45+T datasheet confirms these values are valid across the full −40°C to +125°C operating range.
Can MAX6670AUB45+T drive a 24V fan?
No, MAX6670AUB45+T FANOUT output is rated for a maximum of +15V absolute voltage and designed for nominal +12V fans. Driving a 24V fan violates the device's absolute maximum rating and risks catastrophic failure of the internal MOSFET. The MAX6670AUB45+T datasheet explicitly states "Do not connect the fan to a power supply of higher than 12V nominal, 15V maximum." For 24V systems, an external level-shifted driver stage is mandatory.
What remote sensing components are compatible with MAX6670AUB45+T?
MAX6670AUB45+T is compatible with discrete diode-connected transistors such as 2N3904, CMPT3904, SST3904, and KST3904-TF - all listed in the MAX6670AUB45+T datasheet Table 1. These devices must be small-signal types with collector-base shorted, forward voltage >0.25V at 10µA (max temp), <0.95V at 100µA (min temp), and base resistance <100Ω. CPUs with on-die thermal diodes (e.g., Intel Core i-series) are also supported per the MAX6670AUB45+T functional description.
MAX6670AUB45+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:
- 45°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
MAX6670AUB45+T FAQ
1.How can I place an order for MAX6670AUB45+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6670AUB45+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 MAX6670AUB45+T reliable?
The price and inventory of MAX6670AUB45+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6670AUB45+T is usually 5 days.
3.What payment methods are accepted for MAX6670AUB45+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6670AUB45+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6670AUB45+T?
MAX6670AUB45+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6670AUB45+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 MAX6670AUB45+T?
For technical support, including MAX6670AUB45+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6670AUB45+T requirements.
6.How does Aetrix verify that MAX6670AUB45+T is sourced from the original manufacturer or authorized distributors?
All MAX6670AUB45+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 MAX6670AUB45+T meets industry standards.
7.What is the process for return or replacement of MAX6670AUB45+T?
All MAX6670AUB45+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6670AUB45+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 MAX6670AUB45+T part is unused and in its original packaging.
Return procedure for MAX6670AUB45+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6670AUB45+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…
