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Analog Devices Inc./Maxim Integrated MAX6686AU75L
- Part No.:
- MAX6686AU75L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6686AU75L.pdf
- Description:
- DUAL TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,843
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Product details
Overview
MAX6686AU75L from Maxim Integrated is a dual-output remote-junction temperature switch using an external diode-connected transistor for precision die-temperature monitoring. It features factory-programmed +120°C upper trip threshold, pin-selectable lower threshold range of +75°C to +115°C (in 5°C steps), open-drain active-low THIGH and TLOW outputs, ±1.5°C accuracy, and operates from 3.0V to 5.5V with 200µA typical supply current. It is used in CPU thermal protection and FPGA temperature throttling circuits.
For engineers reviewing the MAX6686AU75L datasheet, MAX6686AU75L pinout, MAX6686AU75L application, or MAX6686AU75L equivalent, key selection criteria include its dual-threshold remote-sensing architecture, µMAX package footprint, open-drain output configuration for both alarms, and compatibility with on-die PNP sensing junctions in high-performance processors.
Technical Context
The MAX6686AU75L integrates a BiCMOS remote-junction sensor front-end with oversampling and noise filtering to reject interference from switching regulators and high-speed digital traces. Its DXP/DXN differential inputs source/sink 8–12µA bias current and require a 2200pF ceramic capacitor for stable threshold accuracy.
Threshold logic is implemented via S1/S2 pin strapping at power-up to select one of nine lower-trip points between +75°C and +115°C; the upper threshold is fixed at +120°C. Both outputs feature 5°C hysteresis to prevent chatter near trip points, and THIGH/TLOW assert independently based on remote junction temperature crossing their respective thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Upper Trip Threshold | +120°C factory-programmed; triggers THIGH low for system shutdown or clock throttling |
| Lower Trip Range | +75°C to +115°C in 5°C increments; selected by S1/S2 pin states at power-on |
| Temperature Accuracy | ±1.5°C over -40°C to +125°C ambient; ensures reliable thermal margining in CPU/FPGA applications |
| Supply Voltage Range | 3.0V to 5.5V; compatible with 3.3V and 5V logic rails without level-shifting |
| Average Supply Current | 200µA typical; enables low-power thermal monitoring in always-on subsystems |
| Output Type | Open-drain, active-low THIGH and TLOW; supports wired-OR alarm aggregation and flexible pull-up voltage selection up to 5.5V |
| Hysteresis | 5°C typical; prevents oscillation during slow thermal transients near threshold boundaries |
Pinout & Package
The MAX6686AU75L is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), pin-compatible with industry-standard uSOP-8 footprints and specified under drawing 21-0036J.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.0V–5.5V main supply; requires 0.1µF bypass capacitor to GND for noise immunity |
| GND | Ground reference | System ground return; shortest possible trace to DXN for remote-sense integrity |
| DXP | Remote diode anode connection | Sources 8–12µA bias current into external PNP base-emitter junction |
| DXN | Remote diode cathode connection | Sinks matching current from external junction; must tie directly to GND with minimal trace length |
| THIGH | Upper-threshold alarm output | Open-drain, active-low; pulls down when remote temperature exceeds +120°C |
| TLOW | Lower-threshold alarm output | Open-drain, active-low; pulls down when remote temperature exceeds selected lower threshold (+75°C to +115°C) |
| S1 | Lower threshold select input | Strap to VDD/GND/floating at power-on to set lower trip point per Table 1 |
| S2 | Lower threshold select input | Paired with S1; determines exact +75°C to +115°C trip value in 5°C steps |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent temperature alarms | Enables hierarchical thermal response: early warning (TLOW) and critical shutdown (THIGH) from single sensor interface |
| Pin-strapped lower threshold | Eliminates need for I²C or SMBus configuration; reduces BOM count and firmware dependency |
| ±1.5°C remote-junction accuracy | Supports tight thermal margins in high-clock-rate CPUs and FPGAs where 1°C error impacts performance headroom |
| 2200pF DXP/DXN noise-filtering cap | Ensures stable threshold behavior in electrically noisy environments like VRM proximity or PCIe slot zones |
| BiCMOS process with oversampling | Rejects high-frequency noise without external RC filtering, simplifying PCB layout around sensing lines |
Applications
| CPU Temperature Protection | Fan Control |
|---|---|
Use Scenario: Monitoring die temperature of x86 or ARM-based processors with integrated PNP sensing diodes. IC Role / Device Role / Timing Role: Remote-junction temperature switch providing two independent logic alarms for dynamic thermal management. Use Value: Enables immediate clock throttling at +75°C (TLOW) and full core shutdown at +120°C (THIGH), preventing silicon damage while maximizing compute uptime. | Use Scenario: Controlling multi-speed cooling fans in embedded industrial controllers based on board-level thermal gradients. IC Role / Device Role / Timing Role: Dual-threshold sensor feeding fan PWM drivers or discrete MOSFET switches. Use Value: Allows staged fan activation-low speed at +85°C, high speed at +100°C-reducing acoustic noise and power consumption below critical thresholds. |
| Multichip Modules | FPGA Temperature Protection |
Use Scenario: Thermal supervision of stacked memory/processor SiPs where internal junctions are inaccessible to external sensors. IC Role / Device Role / Timing Role: Remote diode interface capturing temperature at multiple chiplets via shared DXP/DXN routing. Use Value: Provides accurate per-die thermal data without requiring dedicated ADC channels or complex calibration per chiplet. | Use Scenario: Protecting high-density FPGA fabrics during configuration and high-throughput data processing. IC Role / Device Role / Timing Role: Dual-alarm switch interfacing with FPGA's thermal management IP block or external CPLD sequencer. Use Value: Triggers partial reconfiguration at +95°C (TLOW) and initiates safe state entry at +120°C (THIGH), preserving configuration integrity and avoiding bitstream corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold remote temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6685AU75L | CMOS push-pull, active-high TLOW output instead of open-drain active-low; identical THIGH, thresholds, and accuracy | Requires active-high logic interface; not compatible with wired-OR alarm buses or 5V-tolerant pull-ups | Select MAX6685AU75L only when system logic design mandates active-high assertion and no shared alarm lines exist |
| LM95235CIMM/NOPB | 12-bit remote diode sensor with SMBus interface; no built-in comparators or dual logic outputs | Requires external microcontroller to poll temperature and generate alarms; adds firmware overhead and latency | Choose LM95235CIMM/NOPB when programmable thresholds, logging, or multi-zone monitoring are required beyond simple dual-switch operation |
Compared with MAX6685AU75L and LM95235CIMM/NOPB, the MAX6686AU75L delivers deterministic, zero-latency dual-alarm response using only hardware strapping-ideal for safety-critical thermal shutdown paths where MCU intervention introduces unacceptable delay or failure modes.
Availability
MAX6686AU75L is available at Aetrix Electronics and suitable for CPU thermal protection, FPGA temperature throttling, multichip module supervision, and industrial fan control applications requiring stable component supply across extended product lifecycles.
Supply support for MAX6686AU75L 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, computing, and communications systems.
The MAX6686AU75L belongs to the MAX6685/MAX6686 family of remote-junction temperature switches engineered specifically for real-time, hardware-based thermal management in high-performance processors and programmable logic devices.
FAQ
What is the upper temperature trip threshold for MAX6686AU75L?
The MAX6686AU75L has a factory-programmed upper temperature trip threshold of +120°C. When the remote junction temperature exceeds this value, the THIGH output asserts low. This threshold is fixed and cannot be adjusted via pins or registers. The +120°C setting is confirmed in the Ordering Information table and applies specifically to all MAX6686AU75x variants, including MAX6686AU75L.
How is the lower temperature trip threshold configured on MAX6686AU75L?
The lower temperature trip threshold of MAX6686AU75L is set by strapping the S1 and S2 pins to VDD, GND, or floating before power is applied to VDD. For the AU75L variant, this selects a value within the +75°C to +115°C range in 5°C increments (e.g., +75°C, +80°C, ..., +115°C). Configuration must occur at power-up; changing S1/S2 after VDD is stable has no effect. This behavior is documented in Table 1 of the datasheet.
What type of output does TLOW have on MAX6686AU75L?
The TLOW output on MAX6686AU75L is an open-drain, active-low signal. It pulls low when the remote temperature exceeds the selected lower threshold and remains high-impedance otherwise. A pull-up resistor (typically 10kΩ) to a positive supply ≤5.5V is required. This differs from the MAX6685 series, which uses a CMOS push-pull active-high TLOW output.
Which external sensing element is compatible with MAX6686AU75L?
MAX6686AU75L requires an external diode-connected transistor-not a discrete diode-as the remote temperature sensor. Recommended devices include the 2N3904, CMPT3904, SST3904, and KST3904-TF, all configured with base shorted to collector. These PNP substrate transistors are optimized for use with on-die CPU/FPGA junctions. Diodes alone do not meet the device's forward-voltage characterization requirements.
What package and footprint does MAX6686AU75L use?
MAX6686AU75L uses the 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), also referenced as uSOP-8 and documented under package drawing 21-0036J. It is mechanically and solder-reflow compatible with standard 8-lead SOIC and MSOP footprints but offers a 40% smaller area. The package is RoHS-compliant in + suffix versions; the base MAX6686AU75L variant is leaded.
MAX6686AU75L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Cold, Hot
- Switching Temperature:
- 75°C
- Accuracy:
- ±1.5°C
- Current - Output (Max):
- 20mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /OverTemp
- Selectable Hysteresis:
- No
- Features:
- Selectable Trip Point
- Voltage - Supply:
- 3 V ~ 5.5 V
- Current - Supply:
- 200µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-µMAX
MAX6686AU75L FAQ
1.How can I place an order for MAX6686AU75L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6686AU75L 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 MAX6686AU75L reliable?
The price and inventory of MAX6686AU75L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6686AU75L is usually 5 days.
3.What payment methods are accepted for MAX6686AU75L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6686AU75L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6686AU75L?
MAX6686AU75L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6686AU75L 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 MAX6686AU75L?
For technical support, including MAX6686AU75L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6686AU75L requirements.
6.How does Aetrix verify that MAX6686AU75L is sourced from the original manufacturer or authorized distributors?
All MAX6686AU75L 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 MAX6686AU75L meets industry standards.
7.What is the process for return or replacement of MAX6686AU75L?
All MAX6686AU75L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6686AU75L, 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 MAX6686AU75L part is unused and in its original packaging.
Return procedure for MAX6686AU75L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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