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Analog Devices Inc./Maxim Integrated MAX6687AU75L
- Part No.:
- MAX6687AU75L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6687AU75L.pdf
- Description:
- TEMPERATURE SWITCHES
- Quantity:
- Payment:
- Shipping:
Inventory:3,343
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Product details
Overview
MAX6687AU75L from Maxim Integrated is a dual local/remote temperature switch IC with open-drain active-low outputs, factory-programmed +120°C remote trip threshold, and pin-selectable local trip range of +75°C to +115°C in 5°C increments. It operates from 3.0V to 5.5V, delivers ±1.5°C accuracy over –40°C to +125°C, and is used for CPU/FPGA thermal shutdown and fan control in embedded systems.
For engineers reviewing the MAX6687AU75L datasheet, MAX6687AU75L pinout, MAX6687AU75L application, or MAX6687AU75L equivalent, this page provides verified technical context, exact pin functions, local/remote trip configuration logic, supply current behavior at temperature extremes, and validated alternative parts for thermal protection design.
Technical Context
The MAX6687AU75L integrates two independent thermal comparators: one monitors an external P-N junction (e.g., base-emitter of a CPU-embedded transistor) via DXP/DXN inputs, while the other senses its own die temperature. Remote trip is fixed at +120°C (L suffix), and local trip is set by S1/S2 logic states before power-up - changes after VDD application are ignored.
It uses oversampling and integrated noise filtering to reject transient faults, with 2 Hz sampling rate, 0.25 s typical conversion time, and 5°C hysteresis on both thresholds. Output assertion requires sustained over-temperature - no response occurs at power-on or during single-sample anomalies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Remote Trip Threshold | +120°C factory-programmed; triggers TREMOTE low when external diode junction exceeds this value |
| Local Trip Range | +75°C to +115°C in 5°C steps; selected by S1/S2 pin states (e.g., S1=VDD, S2=FLOAT = +75°C) |
| Accuracy | ±1.5°C at +25°C; ±3.0°C over 0°C to +85°C; ±5.0°C over full –40°C to +125°C operating range |
| Supply Current | 215 µA average at +25°C; increases to ~300 µA at +100°C; supports low-power thermal monitoring |
| Output Type | Open-drain active-low TREMOTE and TLOCAL; require external pull-up resistors (typically 10 kΩ) |
| Package | 8-pin µMAX (3 mm × 3 mm); RoHS-compliant; thermal path optimized for PCB-mounted board-temp sensing |
| Supply Voltage | 3.0 V to 5.5 V; includes POR circuit with 1.0 V to 2.0 V reset threshold and 50 mV hysteresis |
Pinout & Package
MAX6687AU75L is housed in an 8-pin µMAX package (3 mm × 3 mm, 0.6 mm height), with exposed pad for thermal conduction and GND connection. Pin 1 is VDD; pins 3 and 4 form the differential remote-sensing interface (DXP/DXN); pins 5 and 6 are open-drain outputs (TREMOTE/TLOCAL); pins 7 and 8 (S1/S2) configure local trip point.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Power supply input | 3.0 V–5.5 V supply; bypass with 0.1 µF capacitor to GND for stability |
| GND (Pin 2) | Ground reference | Common return for all analog/digital circuits; connects DXN to ground at package |
| DXP (Pin 3) | Remote sense anode input | Sources 8–12 µA into external P-N junction; connects to emitter of sensing transistor |
| DXN (Pin 4) | Remote sense cathode input | Sinks matching current from external junction; must be tied to GND at pin; pairs with DXP for noise rejection |
| TREMOTE (Pin 5) | Remote overtemp output | Open-drain active-low; asserts low when remote junction > +120°C; requires external pull-up |
| TLOCAL (Pin 6) | Local overtemp output | Open-drain active-low; asserts low when die temp > pin-configured threshold (+75°C to +115°C) |
| S1 (Pin 7) | Local threshold select | Logic input (GND/VDD/floating); sets local trip with S2 per Table 1; latched at power-on |
| S2 (Pin 8) | Local threshold select | Logic input (GND/VDD/floating); used with S1 to select one of nine local thresholds in +75°C–+115°C range |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed remote trip | +120°C threshold with ±5.0°C max error over full temperature range ensures reliable CPU/FPGA shutdown |
| Pin-programmable local trip | Nine discrete thresholds between +75°C and +115°C enable precise board-level thermal management without firmware |
| No false triggering | Internal oversampling and 2 Hz sampling prevent assertion on transients or power-up glitches |
| Low quiescent current | 215 µA average supply current enables always-on thermal monitoring in battery-backed or energy-constrained systems |
| Differential remote sensing | DXP/DXN interface rejects common-mode noise and supports long trace routing away from noisy digital/switching domains |
Applications
| CPU Thermal Shutdown | FPGA Die Protection |
|---|---|
|
Use Scenario: Monitors temperature of high-performance CPU die using on-chip substrate PNP transistor as remote sensor. IC Role / Device Role / Timing Role: Remote temperature switch asserting TREMOTE low to initiate system shutdown when CPU junction exceeds +120°C. Use Value: Prevents permanent damage by halting operation before thermal runaway; leverages factory-trimmed +120°C threshold for consistent, calibration-free response. |
Use Scenario: Tracks FPGA die temperature via internal P-N junction, triggering cooling or throttling before logic errors occur. IC Role / Device Role / Timing Role: Remote temperature switch providing fail-safe overtemperature signal to FPGA management controller. Use Value: Enables deterministic thermal response without FPGA firmware involvement; ±1.5°C accuracy ensures tight margin control. |
| Board-Level Fan Control | Industrial Ambient Alarm |
|
Use Scenario: Mounted near power MOSFETs or DC-DC converters to monitor PCB hotspot temperature. IC Role / Device Role / Timing Role: Local temperature switch asserting TLOCAL low when board reaches user-selected +95°C (S1=VDD, S2=VDD). Use Value: Activates cooling fan before adjacent components exceed rated operating limits; eliminates need for microcontroller polling. |
Use Scenario: Installed on industrial control board where ambient temperature must stay below +110°C to avoid derating. IC Role / Device Role / Timing Role: Local temperature switch configured for +110°C trip (S1=VDD, S2=FLOAT) to drive alarm LED or PLC input. Use Value: Provides hardware-level ambient monitoring with no software dependency; 5°C hysteresis prevents chatter near threshold. |
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 |
|---|---|---|---|
| MAX6688AU75L | Push-pull active-high outputs instead of open-drain; identical remote/local thresholds and accuracy | Eliminates need for external pull-up resistors; better suited for direct MCU GPIO interfacing without level-shifting | Select when system logic expects active-high assertion and board space is constrained by resistor placement |
| LM95235CIMM/NOPB | Remote-only digital temperature sensor with SMBus interface; no local switch or open-drain outputs | Requires host processor for interpretation; supports programmable remote trip but lacks autonomous shutdown capability | Choose only if digital readback and dynamic trip adjustment are required, and autonomous hardware shutdown is not needed |
Compared with MAX6687AU75L, MAX6688AU75L offers simplified interface via push-pull outputs but removes flexibility for wired-OR fault signaling; LM95235CIMM/NOPB adds digital configurability but introduces software dependency and latency, making it unsuitable for safety-critical immediate shutdown.
Availability
MAX6687AU75L is available at Aetrix Electronics and suitable for CPU thermal protection, FPGA die monitoring, and industrial board-level fan control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6687AU75L 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 applications.
The MAX6687 series targets autonomous thermal protection in space-constrained systems, delivering hardware-based local/remote switching without firmware overhead or external supervision.
FAQ
What is the remote temperature trip threshold for MAX6687AU75L?
The MAX6687AU75L has a factory-programmed remote temperature trip threshold of +120°C, indicated by the "L" suffix in the part number. This threshold applies to the external P-N junction sensed via DXP/DXN pins and triggers the TREMOTE output low when exceeded. The value is trimmed during manufacturing and guaranteed over the full –40°C to +125°C operating range.
How do I configure the local temperature trip point on MAX6687AU75L?
The local trip point of MAX6687AU75L is set by connecting pins S1 and S2 to GND, VDD, or leaving them floating - before applying power to VDD. For example, S1=VDD and S2=FLOAT selects +75°C, while S1=VDD and S2=VDD selects +80°C. The setting is latched at power-on; changing S1/S2 afterward has no effect. Table 1 in the datasheet lists all nine combinations for the +75°C to +115°C range.
Does MAX6687AU75L require external components for basic operation?
Yes - MAX6687AU75L requires a 0.1 µF bypass capacitor between VDD and GND, a 2200 pF ceramic capacitor across DXP/DXN for noise filtering, and pull-up resistors (typically 10 kΩ) on both TREMOTE and TLOCAL outputs due to their open-drain configuration. These components are mandatory for specified accuracy, noise immunity, and output functionality.
What is the accuracy specification of MAX6687AU75L over temperature?
MAX6687AU75L guarantees ±1.5°C accuracy at +25°C, ±3.0°C from 0°C to +85°C, and ±5.0°C over its full operating range of –40°C to +125°C. Remote diode accuracy includes contributions from ideality factor mismatch and series resistance; local die accuracy reflects internal sensor calibration and thermal coupling to the PCB.
Can MAX6687AU75L be used with discrete diodes as the remote sensor?
No - MAX6687AU75L is optimized for P-N junctions with ideality factor ~1.008, such as base-emitter junctions of substrate PNP transistors found in CPUs, FPGAs, or ASICs. Discrete diodes exhibit inconsistent ideality and poor VBE matching, leading to large trip errors. The datasheet explicitly states "Always use a transistor for the sensing junction; diodes do not work."
MAX6687AU75L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- MAX6687
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 75°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-µMAX
MAX6687AU75L FAQ
1.How can I place an order for MAX6687AU75L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6687AU75L 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 MAX6687AU75L reliable?
The price and inventory of MAX6687AU75L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6687AU75L is usually 5 days.
3.What payment methods are accepted for MAX6687AU75L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6687AU75L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6687AU75L?
MAX6687AU75L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6687AU75L 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 MAX6687AU75L?
For technical support, including MAX6687AU75L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6687AU75L requirements.
6.How does Aetrix verify that MAX6687AU75L is sourced from the original manufacturer or authorized distributors?
All MAX6687AU75L 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 MAX6687AU75L meets industry standards.
7.What is the process for return or replacement of MAX6687AU75L?
All MAX6687AU75L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6687AU75L, 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 MAX6687AU75L part is unused and in its original packaging.
Return procedure for MAX6687AU75L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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