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Analog Devices Inc./Maxim Integrated MAX6687AU40L+
- Part No.:
- MAX6687AU40L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6687AU40L+.pdf
- Description:
- THERMOSTAT ACT LOW OPEN DR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,606
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Product details
Overview
MAX6687AU40L+ from Maxim Integrated is a dual local/remote temperature switch IC in an 8-pin µMAX package, featuring factory-programmed +120°C remote trip threshold and pin-selectable +40°C to +80°C local threshold in 5°C increments. It delivers ±1.5°C accuracy, 2Hz sampling, and open-drain active-low outputs for CPU/FPGA thermal shutdown and fan control applications.
For engineers reviewing the MAX6687AU40L+ datasheet, MAX6687AU40L+ pinout, MAX6687AU40L+ application, or MAX6687AU40L+ equivalent, key selection criteria include remote diode interface compatibility, local threshold programming via S1/S2 pins, open-drain output drive capability, ±1.5°C trip accuracy over -40°C to +125°C, and 215µA average supply current at 3.3V.
Technical Context
The MAX6687AU40L+ integrates two independent temperature comparators: one monitors an external P-N junction (e.g., CPU die's substrate PNP) via DXP/DXN with fixed +120°C trip, and the other senses its own die temperature using internal thermal sensing with user-configurable local thresholds. Both paths employ oversampling and noise filtering to reject transient faults.
It uses BiCMOS process technology (7765 transistors), supports 3.0V–5.5V supply, and incorporates power-on reset (POR) with 1.0V–2.0V threshold and 50mV hysteresis to prevent false triggering during startup. The device asserts outputs only after stable temperature crossing-no single-sample assertion occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Trip Threshold | +120°C factory-programmed; triggers TREMOTE on sustained exceedance, not transient spikes |
| Local Trip Threshold Range | +40°C to +80°C in 5°C steps; set by S1/S2 pin states before power-up |
| Accuracy | ±1.5°C at +25°C; ±3.0°C over 0°C to +85°C operating range |
| Supply Current | 215µA typical average; enables low-power thermal monitoring in always-on systems |
| Output Type | Two open-drain active-low outputs (TREMOTE, TLOCAL); require external pull-ups |
| Temperature Sampling Rate | 2Hz (500ms sample period); balances responsiveness and power efficiency |
| Hysteresis | 5.0°C for both local and remote thresholds; prevents output oscillation near trip point |
Pinout & Package
Package: 8-pin µMAX (3.05mm × 3.05mm × 0.8mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.0V–5.5V main supply; requires 0.1µF bypass capacitor to GND |
| GND | Ground reference | Common return path; DXN must connect directly to this pin |
| DXP | Remote sense anode input | Sources 8–12µA into external P-N junction (e.g., CPU base-emitter); pair with DXN |
| DXN | Remote sense cathode input | Sinks current from external junction; must tie to GND at package pin |
| TREMOTE | Open-drain active-low output | Asserts low when remote temperature > +120°C; needs external pull-up resistor |
| TLOCAL | Open-drain active-low output | Asserts low when local die temperature exceeds S1/S2-selected threshold |
| S1 | Local threshold select input | Logic input (0.4V/1.8V thresholds); state latched at power-on; floating = high-impedance |
| S2 | Local threshold select input | Logic input (0.4V/1.8V thresholds); state latched at power-on; floating = high-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed remote threshold | +120°C (L suffix) ensures precise CPU/FPGA overtemperature shutdown without calibration |
| Pin-programmable local threshold | 9 discrete settings (+40°C to +80°C) via S1/S2 enable board-level thermal policy without firmware |
| Noise-immune remote sensing | Oversampling + 2200pF DXP/DXN filter capacitor rejects EMI from switching regulators and digital noise |
| Startup-safe operation | No output assertion on power-up or single-sample faults eliminates spurious system shutdown |
| Low quiescent current | 215µA average draw extends battery life in portable thermal monitoring systems |
Applications
| CPU Thermal Shutdown | FPGA Board Monitoring |
|---|---|
Use Scenario: Monitors CPU die temperature via integrated substrate PNP transistor to prevent thermal damage during sustained load. IC Role / Device Role / Timing Role: Remote temperature switch asserting TREMOTE to system PMIC or reset controller upon +120°C exceedance. Use Value: Prevents irreversible CPU degradation by initiating controlled shutdown before junction temperature reaches 150°C limit. |
Use Scenario: Tracks FPGA package temperature on PCB to activate cooling before configuration logic errors occur. IC Role / Device Role / Timing Role: Local temperature switch using S1/S2 = GND/GND for +40°C trip, driving fan enable line via TLOCAL. Use Value: Maintains FPGA timing margins and signal integrity by limiting board temperature rise during high-speed transceiver operation. |
| Fan Speed Control Interface | Industrial Controller Overtemperature Alarm |
Use Scenario: Provides binary fan-on signal based on local board temperature, synchronized with processor activity cycles. IC Role / Device Role / Timing Role: Local switch with S1/S2 = VDD/VDD for +80°C threshold; TLOCAL drives optocoupler input for isolated fan control. Use Value: Reduces acoustic noise and power consumption by delaying fan activation until thermal load justifies full speed. |
Use Scenario: Detects abnormal enclosure heating in DIN-rail mounted PLCs due to failed heatsinking or ambient drift. IC Role / Device Role / Timing Role: Dual-sense function: local for enclosure air temp, remote for critical ASIC; both outputs feed OR-gated alarm latch. Use Value: Enables predictive maintenance by distinguishing between ambient rise (+75°C local) and component failure (+120°C remote). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar local/remote temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6688AU40L+ | Push-pull active-high outputs instead of open-drain; identical thresholds, accuracy, and pinout | Eliminates need for external pull-up resistors; better suited for direct MCU GPIO interfacing | Select when system logic requires active-high signaling and no external biasing is desired |
| LM95235CIMM/NOPB | Provides digital SMBus output instead of analog-comparator outputs; ±1.0°C accuracy; 10-bit remote reading | Enables dynamic threshold adjustment and temperature logging; not a drop-in replacement | Select when programmable thresholds and telemetry data are required over simple shutdown signaling |
Compared with MAX6687AU40L+, MAX6688AU40L+ offers identical thermal sensing but simplifies interface design with push-pull outputs, while LM95235CIMM/NOPB trades simplicity for digital configurability and higher measurement resolution-neither is pin-compatible, but both serve overlapping thermal protection roles.
Availability
MAX6687AU40L+ is available at Aetrix Electronics and suitable for CPU thermal protection, FPGA board monitoring, and industrial controller overtemperature alarms requiring stable component supply across extended temperature ranges.
Supply support for MAX6687AU40L+ 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 and mixed-signal ICs for power, sensing, and interface applications in industrial, computing, and communications systems.
The MAX6687/MAX6688 product line delivers robust, low-power thermal monitoring solutions specifically for microprocessor, FPGA, and ASIC thermal management where deterministic shutdown behavior and noise immunity are critical.
FAQ
What is the remote temperature sensing method used by the MAX6687AU40L+?
The MAX6687AU40L+ measures remote temperature using an external P-N junction-typically the base-emitter junction of a substrate PNP transistor integrated into a CPU, FPGA, or ASIC die. It sources 8–12µA from DXP and sinks matching current at DXN, measuring the forward voltage drop to compute junction temperature. Discrete diodes are not supported; only transistor-based sensing junctions meet accuracy requirements.
How do I configure the local temperature trip threshold on the MAX6687AU40L+?
The local trip threshold of the MAX6687AU40L+ is set by connecting pins S1 and S2 to VDD, GND, or leaving them floating *before* applying power to VDD-the configuration is latched at power-on and cannot be changed dynamically. For example, S1=GND and S2=GND selects +40°C, while S1=VDD and S2=VDD selects +80°C. Table 1 in the datasheet defines all nine combinations across the +40°C to +80°C range.
Does the MAX6687AU40L+ assert its outputs immediately when temperature crosses the threshold?
No. The MAX6687AU40L+ does not assert TREMOTE or TLOCAL on transient or single-sample faults. It requires sustained temperature exceedance over multiple samples (2Hz sampling, ~500ms period) before output assertion, and includes 5°C hysteresis to prevent chatter. This behavior, combined with power-on reset suppression, ensures reliable system shutdown without false triggers during startup or brief thermal spikes.
What is the recommended capacitor value for the DXP/DXN inputs on the MAX6687AU40L+?
A 2200pF ceramic capacitor must be placed directly across DXP and DXN, as close as possible to the MAX6687AU40L+ package pins. This capacitor filters high-frequency noise from switching regulators and digital circuits, maintaining ±1.5°C trip accuracy. Using >3300pF (50% over nominal) can introduce up to ±1°C error; values below 1500pF degrade noise immunity and may cause erratic trip behavior.
Can the MAX6687AU40L+ operate from a 2.8V supply?
No. The MAX6687AU40L+ requires a minimum supply voltage of 3.0V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 3.0V risks improper POR circuit function, inaccurate temperature conversion, and undefined output states. The specified range is strictly 3.0V to 5.5V; for lower-voltage systems, consider the MAX6683 or similar 1.7V–5.5V alternatives-but those lack dual-sensing capability.
MAX6687AU40L+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 40°C ~ 80°C, 120°C
- Accuracy:
- ±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:
- 215µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-uMAX
MAX6687AU40L+ FAQ
1.How can I place an order for MAX6687AU40L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6687AU40L+ 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 MAX6687AU40L+ reliable?
The price and inventory of MAX6687AU40L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6687AU40L+ is usually 5 days.
3.What payment methods are accepted for MAX6687AU40L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6687AU40L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6687AU40L+?
MAX6687AU40L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6687AU40L+ 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 MAX6687AU40L+?
For technical support, including MAX6687AU40L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6687AU40L+ requirements.
6.How does Aetrix verify that MAX6687AU40L+ is sourced from the original manufacturer or authorized distributors?
All MAX6687AU40L+ 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 MAX6687AU40L+ meets industry standards.
7.What is the process for return or replacement of MAX6687AU40L+?
All MAX6687AU40L+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6687AU40L+, 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 MAX6687AU40L+ part is unused and in its original packaging.
Return procedure for MAX6687AU40L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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