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Analog Devices Inc./Maxim Integrated MAX6512UT045
- Part No.:
- MAX6512UT045
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SOT-23-6
- Datasheet:
-
MAX6512UT045.pdf
- Description:
- REMOTE TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,985
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Product details
Overview
MAX6512UT045 from Maxim Integrated is a remote temperature switch IC that uses an external P-N junction (e.g., diode-connected transistor) to monitor remote die or board temperature, asserting an active-low open-drain output when temperature exceeds +45°C. It operates from +3.0V to +5.5V, consumes 400µA typical supply current, and features pin-selectable 5°C or 10°C hysteresis - ideal for microprocessor reset or interrupt signaling in CPU thermal monitoring.
For engineers reviewing the MAX6512UT045 datasheet, MAX6512UT045 pinout, MAX6512UT045 application, or MAX6512UT045 equivalent, this device delivers factory-trimmed trip accuracy (±3°C over –5°C to +55°C ambient), <100ms response time, and immunity to series parasitic resistance up to 100Ω - critical for reliable thermal management in space-constrained SOT23-6 designs.
Technical Context
The MAX6512UT045 integrates a precision bandgap reference, chopper-stabilized amplifier, current source, and comparator to measure forward voltage across an external diode-connected transistor and compute temperature. Its architecture rejects noise via oversampling and integrated filtering, requiring only a 2200pF ceramic capacitor on DXP/DXN for stable threshold accuracy.
Hysteresis is controlled by the HYST pin (VDD = 10°C, GND = 5°C), preventing output chatter near the +45°C trip point. The open-drain TOVER output sinks current only and must be pulled up externally - enabling direct interface with µP reset inputs, interrupt lines, or logic-level fan controllers without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Threshold | +45°C factory-programmed trip point - fixed, non-adjustable, enables precise overtemperature detection for early-stage thermal shutdown. |
| Accuracy | ±3°C at TA = –5°C to +55°C - ensures reliable triggering within tight thermal margins for CPU and battery-pack protection. |
| Supply Voltage Range | +3.0V to +5.5V - compatible with standard 3.3V and 5V system rails without external regulation. |
| Supply Current | 400µA typical - minimizes power impact in always-on thermal monitoring circuits. |
| Response Time | 70–120ms - fast enough to react to rapid thermal transients in high-speed computing environments. |
| Hysteresis | PIN-selectable 5°C or 10°C - configurable via HYST pin to balance noise immunity vs. temperature recovery granularity. |
| Output Type | Active-low open-drain - requires external pull-up; supports wired-OR configurations and voltage-level flexibility. |
Pinout & Package
MAX6512UT045 is housed in a 6-pin SOT23-6 package (package code U6F-6, drawing 21-0058I), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not present. Standard JEDEC MO-178 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +3.0V to +5.5V; requires 0.1µF bypass capacitor to GND for noise suppression. |
| GND | Ground reference | System ground return for all internal circuitry and sensing bias currents. |
| HYST | Hysteresis selection input | CMOS-compatible; tie to VDD for 10°C hysteresis, GND for 5°C - must not float. |
| TOVER | Active-low open-drain output | Sinks current only; connects to µP reset/interrupt line with external pull-up resistor (e.g., 10kΩ). |
| DXN | Negative sense terminal | Connects to cathode of external P-N junction (e.g., MMBT3904 base-collector node); must be tied to GND. |
| DXP | Positive sense terminal | Connects to anode of external P-N junction; pairs with DXN for differential remote temperature measurement. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed +45°C trip threshold | Eliminates external resistor networks or calibration; guarantees repeatable activation point across production lots. |
| Insensitivity to ≤100Ω series parasitic resistance | Enables robust operation despite PCB trace resistance or connector contact resistance in remote-sensing paths. |
| Pin-selectable hysteresis (5°C or 10°C) | Allows trade-off between thermal stability and recovery sensitivity without changing BOM or layout. |
| <100ms response time | Supports real-time reaction to thermal events in high-performance processors and power modules. |
| Open-drain output with 1mA sink capability | Permits flexible interfacing with 1.8V–5V logic families and enables multi-device alarm bus architectures. |
Applications
| CPU Temperature Monitoring | Fan Control |
|---|---|
|
Use Scenario: Monitoring die temperature of high-speed x86 or ARM processors during burst-load operation. IC Role / Device Role / Timing Role: Remote temperature switch providing overtemperature interrupt signal to processor's thermal management unit. Use Value: Triggers immediate throttling or safe shutdown before silicon damage occurs at +45°C, leveraging factory-trimmed accuracy and fast response. |
Use Scenario: Activating cooling fans in embedded industrial controllers when ambient or heatsink temperature rises. IC Role / Device Role / Timing Role: Thermal alarm driver interfacing with fan controller IC or discrete MOSFET gate via open-drain output. Use Value: Eliminates need for external comparator or microcontroller polling - reduces component count and firmware overhead. |
| Battery Pack Protection | Temperature Alarm System |
|
Use Scenario: Detecting unsafe cell temperature in Li-ion battery packs during charging or discharge cycles. IC Role / Device Role / Timing Role: Standalone thermal cutoff device asserting fault signal to battery management system (BMS) supervisor. Use Value: Provides fail-safe hardware-level protection independent of BMS software, with ±3°C accuracy ensuring compliance with IEC 62133 limits. |
Use Scenario: Generating audible/visual alerts in medical or telecom equipment when enclosure temperature exceeds safe operating range. IC Role / Device Role / Timing Role: Primary thermal sensor interface driving LED driver or buzzer enable line via open-drain output. Use Value: Enables simple, low-power alarm circuit with no active components beyond pull-up resistor and indicator load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar remote temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6511UT045 | Active-low CMOS output (not open-drain); higher output drive strength (+50mA sink/source), no external pull-up required. | Better suited for direct driving of logic inputs without pull-up; less flexible for mixed-voltage or wired-OR buses. | Select when interfacing directly with CMOS inputs and board space prohibits pull-up resistors. |
| LM75BIMM-3/NOPB | I²C digital output, 9-bit temperature reading, programmable thresholds, no remote diode interface - measures local die temperature only. | Requires microcontroller firmware support; cannot monitor remote ICs or discrete transistors; lacks open-drain alarm assertion. | Select when digital temperature telemetry and configurability outweigh need for hardware-fast remote sensing. |
Compared with MAX6511UT045 and LM75BIMM-3/NOPB, the MAX6512UT045 uniquely combines factory-set +45°C trip, open-drain alarm output, and true remote P-N junction sensing - delivering simpler, faster, and more deterministic thermal protection than digital alternatives or local-only sensors.
Availability
MAX6512UT045 is available at Aetrix Electronics and suitable for CPU thermal monitoring, battery pack protection, fan control, and temperature alarm systems requiring stable component supply across industrial, computing, and medical product lifecycles.
Supply support for MAX6512UT045 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 semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, computing, and communications applications.
The MAX651x family was designed specifically for cost-sensitive, space-constrained remote temperature monitoring - delivering factory-trimmed accuracy, low quiescent current, and robust diode-interface performance in ultra-small SOT23 packages.
FAQ
What is the exact temperature trip point of the MAX6512UT045?
The MAX6512UT045 has a factory-programmed temperature threshold of +45°C. This value is laser-trimmed during production and is not adjustable. Accuracy is specified as ±3°C over ambient temperatures from –5°C to +55°C, and ±5°C from –40°C to +85°C. The trip point remains stable across its full supply range (+3.0V to +5.5V) with power-supply sensitivity of only ±0.6°C/V.
Does the MAX6512UT045 require an external pull-up resistor on the TOVER pin?
Yes, the MAX6512UT045 features an active-low open-drain TOVER output, which can only sink current. An external pull-up resistor (typically 4.7kΩ to 10kΩ) is required to establish a valid high logic level when the output is deasserted. Without it, TOVER remains floating and cannot drive downstream logic reliably. The pull-up voltage may differ from VDD, enabling level translation.
Which external P-N junction devices are recommended for use with the MAX6512UT045?
Maxim recommends diode-connected transistors such as the MMBT3904, CMPT3904, SST3904, KST3904-TF, SMBT3904, or FMMT3904CT-ND. These devices must have base shorted to collector to form the P-N junction. High forward-current-gain consistency ensures uniform VBE characteristics and optimal accuracy. Large power transistors are discouraged due to process variation and thermal mass effects.
Can the MAX6512UT045 measure temperature accurately if there is series resistance in the DXP/DXN path?
Yes - the MAX6512UT045 is specifically designed to reject errors from series parasitic resistance. Resistance values up to 100Ω in either the DXP or DXN line introduce less than ±1°C error in the trip threshold. This tolerance simplifies PCB routing and accommodates connector/contact resistance without calibration or compensation.
How is hysteresis configured on the MAX6512UT045, and why is it important?
Hysteresis on the MAX6512UT045 is set via the HYST pin: connect to VDD for 10°C hysteresis, or to GND for 5°C. It must never be left floating. Hysteresis prevents output oscillation when temperature hovers near the +45°C trip point - for example, with 10°C hysteresis, TOVER asserts at +45°C and clears only after temperature falls below +35°C. This ensures clean, chatter-free switching in noisy thermal environments.
MAX6512UT045 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 45°C
- Accuracy:
- ±5°C
- Current - Output (Max):
- 50mA
- Output Type:
- Open Drain
- Output:
- Active High
- Output Function:
- /OverTemp
- Selectable Hysteresis:
- Yes
- Features:
- Selectable Hysteresis
- Voltage - Supply:
- 3 V ~ 5.5 V
- Current - Supply:
- 400µA
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-6
MAX6512UT045 FAQ
1.How can I place an order for MAX6512UT045 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6512UT045 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 MAX6512UT045 reliable?
The price and inventory of MAX6512UT045 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6512UT045 is usually 5 days.
3.What payment methods are accepted for MAX6512UT045?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6512UT045 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6512UT045?
MAX6512UT045 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6512UT045 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 MAX6512UT045?
For technical support, including MAX6512UT045 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6512UT045 requirements.
6.How does Aetrix verify that MAX6512UT045 is sourced from the original manufacturer or authorized distributors?
All MAX6512UT045 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 MAX6512UT045 meets industry standards.
7.What is the process for return or replacement of MAX6512UT045?
All MAX6512UT045 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6512UT045, 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 MAX6512UT045 part is unused and in its original packaging.
Return procedure for MAX6512UT045:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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