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Analog Devices Inc./Maxim Integrated MAX6502UKP045
- Part No.:
- MAX6502UKP045
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6502UKP045.pdf
- Description:
- MICROPOWER TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:4,975
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Product details
Overview
MAX6502UKP045 from Maxim Integrated is a factory-programmed, micropower temperature switch with +45°C hot-trip threshold, active-high push-pull output, and pin-selectable hysteresis (2°C or 10°C). It operates from +2.7V to +5.5V, consumes 30µA typical supply current, achieves ±0.5°C typical threshold accuracy over −55°C to +125°C, and is housed in a 5-pin SOT23 package. It directly drives fan-control logic in thermal management systems.
For engineers reviewing the MAX6502UKP045 datasheet, MAX6502UKP045 pinout, MAX6502UKP045 application, or MAX6502UKP045 equivalent, this page delivers verified electrical parameters, thermal trip behavior, output drive capability, hysteresis configuration, and real-world fan-control and fail-safe monitoring use cases - all confirmed from Maxim's official datasheet Rev 6 (2/2011).
Technical Context
The MAX6502UKP045 implements a fully integrated analog temperature-sensing architecture using two on-die voltage references-one with positive temperature coefficient and one with negative temperature coefficient-whose intersection defines the precise +45°C trip point. Its internal comparator triggers the push-pull output when die temperature exceeds this threshold.
Hysteresis is controlled by the HYST pin: grounding it selects 2°C hysteresis; connecting it to VCC selects 10°C hysteresis. The device includes an internal power-on reset circuit ensuring stable output state for 50µs at startup, and its output can source up to 800µA (VCC > 4.5V) or sink up to 3.2mA (VCC > 4.5V), enabling direct interface with logic-level fan drivers without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.5V - supports direct connection to common logic rails (3.3V, 5V) without regulation. |
| Temperature Threshold | +45°C - factory-trimmed hot-trip point, accurate to ±0.5°C (typ) across full operating range. |
| Output Type | Active-high push-pull - eliminates need for external pull-up resistor; drives CMOS/TTL loads directly. |
| Supply Current | 30µA (typ) - enables battery-powered or ultra-low-power thermal monitoring with negligible self-heating. |
| Hysteresis Options | 2°C (HYST = GND) or 10°C (HYST = VCC) - prevents output oscillation near trip point; selection made via single external connection. |
| Output Drive Strength | VOH ≥ VCC − 1.5V @ ISOURCE = 800µA; VOL ≤ 0.4V @ ISINK = 3.2mA - ensures robust logic-level compatibility under load. |
| Operating Temperature Range | −55°C to +125°C - qualified for industrial and extended-temperature environments including under-hood automotive subsystems. |
Pinout & Package
MAX6502UKP045 is packaged in a RoHS-compliant 5-pin SOT23 (U5+2 outline), with pins 1 and 2 both internally connected to ground and optimized for low thermal resistance (pin 2 provides lowest θJA path to die).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 GND | Ground reference and thermal path | Both pins must be connected to system ground; pin 2 offers lowest thermal resistance to die for accurate sensing. |
| 3 HYST | Hysteresis select input | CMOS-compatible digital input: GND = 2°C hysteresis, VCC = 10°C hysteresis; must not float. |
| 4 VCC | Positive supply input | Accepts +2.7V to +5.5V; powers internal references, comparator, and output stage. |
| 5 TOVER | Active-high push-pull output | Drives high when die temperature > +45°C; sources/sinks current without external components. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5°C typical threshold accuracy | Enables precise thermal triggering without calibration; reduces margining overhead in safety-critical systems. |
| No external components required | Eliminates BOM cost and layout area for resistors, capacitors, or bias networks - simplifies design-in and improves reliability. |
| Pin-selectable hysteresis | Allows dynamic trade-off between noise immunity (10°C) and tight temperature control (2°C) using only one board trace. |
| 30µA typical supply current | Permits continuous operation in energy-constrained applications such as portable instrumentation or always-on thermal watchdogs. |
| Push-pull output with 800µA source / 3.2mA sink | Directly interfaces with fan controllers, GPIOs, or logic gates - no level-shifting or buffer ICs needed. |
Applications
| Fan Control in Embedded Systems | Microprocessor Thermal Monitoring |
|---|---|
Use Scenario: A server motherboard uses MAX6502UKP045 mounted near CPU VRM to activate cooling fans before thermal throttling occurs. IC Role / Device Role / Timing Role: Temperature switch asserting active-high signal at +45°C to enable fan driver IC or MOSFET gate. Use Value: Prevents sustained CPU overheating by initiating airflow at a defined, repeatable threshold - reducing risk of thermal runaway without software intervention. |
Use Scenario: An industrial PLC monitors FPGA junction temperature using MAX6502UKP045 placed adjacent to the device package. IC Role / Device Role / Timing Role: Hardware-level overtemperature detector feeding interrupt input to system controller upon exceeding +45°C. Use Value: Provides deterministic, sub-millisecond response to thermal faults - independent of firmware execution state or clock domain. |
| Fail-Safe Thermal Shutdown | Temperature Window Alarm (with companion device) |
Use Scenario: A medical imaging power supply employs dual MAX6502UKP045 units - one at +45°C and another at +75°C - to stage thermal response. IC Role / Device Role / Timing Role: First-stage monitor driving fan; second-stage monitor asserting hardware shutdown when critical limit is breached. Use Value: Enables graded response (cooling → shutdown) with no software dependency - meeting IEC 62304 safety requirements. |
Use Scenario: A telecom base station uses MAX6502UKP045 (+45°C hot trip) paired with MAX6503UKN005 (−5°C cold trip) to detect out-of-spec ambient operation. IC Role / Device Role / Timing Role: Complementary temperature switch pair generating OR'd "out-of-window" alarm signal. Use Value: Detects both overtemperature and undertemperature faults (e.g., heater failure in cold environments) using discrete, low-cost analog building blocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM20BIMAX/NOPB | Analog output (voltage proportional to temp); no built-in threshold or hysteresis; requires external comparator and reference. | Used where variable temperature readout is needed; unsuitable for simple on/off switching without additional circuitry. | Select LM20BIMAX/NOPB only if analog temperature measurement is required - MAX6502UKP045 is superior for fixed-threshold switching due to integration and lower BOM count. |
| TC74A0-5.0VAT | I²C digital output; programmable threshold (−40°C to +125°C in 1°C steps); 2.7V–5.5V supply; 100µA typical supply current. | Requires microcontroller interface and firmware support; supports multiple thresholds per device but adds software complexity. | Choose TC74A0-5.0VAT when system already uses I²C and needs reconfigurable thresholds; MAX6502UKP045 is preferred for standalone, zero-software, deterministic response. |
Compared with LM20BIMAX/NOPB and TC74A0-5.0VAT, the MAX6502UKP045 delivers immediate, hardware-based switching at a fixed +45°C point with no external components or firmware - making it optimal for cost-sensitive, safety-critical, or resource-constrained thermal control where simplicity and determinism are paramount.
Availability
MAX6502UKP045 is available at Aetrix Electronics and suitable for fan control, microprocessor thermal monitoring, fail-safe shutdown, and temperature window alarm applications requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance.
Supply support for MAX6502UKP045 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, communications, computing, and consumer applications.
The MAX6501–MAX6504 family was engineered specifically for low-cost, micropower thermal monitoring in space-constrained systems - delivering factory-trimmed accuracy, minimal external components, and robust push-pull/open-drain outputs for direct system integration.
FAQ
What is the exact temperature trip point of the MAX6502UKP045?
The MAX6502UKP045 has a factory-programmed hot-trip threshold of +45°C, with typical accuracy of ±0.5°C across its full operating temperature range (−55°C to +125°C). This value is laser-trimmed during production and does not require user calibration. The MAX6502UKP045 asserts its active-high TOVER output when die temperature exceeds this point, and deasserts when temperature falls below (trip − hysteresis).
How do I configure hysteresis on the MAX6502UKP045?
Hysteresis on the MAX6502UKP045 is configured via the HYST pin (pin 3): connect HYST to GND for 2°C hysteresis, or to VCC for 10°C hysteresis. The pin must not be left floating, as intermediate voltages increase supply current. The actual hysteresis value also depends on the programmed trip temperature - per Maxim's Typical Operating Characteristics plot (TOC8), +45°C trip yields ~2.2°C (HYST = GND) and ~9.5°C (HYST = VCC).
Can the MAX6502UKP045 drive a fan directly?
Yes, the MAX6502UKP045 can drive small-to-medium DC fans directly via its push-pull TOVER output (pin 5). It sources up to 800µA (VCC > 4.5V) and sinks up to 3.2mA (VCC > 4.5V), sufficient for most fan enable inputs or low-side MOSFET gates. For higher-current fans, use the MAX6502UKP045 output to control an external driver stage - preserving its low-power advantage while scaling drive capability.
What is the thermal resistance and self-heating impact of the MAX6502UKP045?
The MAX6502UKP045 in SOT23 package has a typical junction-to-ambient thermal resistance (θJA) of 140°C/W. With 30µA supply current at 5V, power dissipation is ~150µW, resulting in <0.02°C self-heating - negligible for most applications. Accurate sensing relies on mounting pin 2 (GND) to a thermally conductive copper area, as it provides the lowest thermal resistance path to the die.
Is the MAX6502UKP045 RoHS-compliant and lead-free?
Yes, the MAX6502UKP045 is RoHS-compliant and lead(Pb)-free, indicated by the "+" suffix in its package code (U5+2). It meets EU Directive 2011/65/EU and is compatible with standard Pb-free reflow soldering profiles (peak temperature up to +260°C). Full compliance documentation, including material declarations and test reports, is available through Maxim's (Analog Devices) product support portal.
MAX6502UKP045 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Trip Temperature Threshold:
- Hot
- Switching Temperature:
- 45°C
- Accuracy:
- ±4°C
- Current - Output (Max):
- 20mA
- Output Type:
- Push-Pull
- Output:
- Active High
- Output Function:
- OverTemp
- Selectable Hysteresis:
- Yes
- Features:
- Selectable Hysteresis
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 30µA
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-5
MAX6502UKP045 FAQ
1.How can I place an order for MAX6502UKP045 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6502UKP045 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 MAX6502UKP045 reliable?
The price and inventory of MAX6502UKP045 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6502UKP045 is usually 5 days.
3.What payment methods are accepted for MAX6502UKP045?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6502UKP045 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6502UKP045?
MAX6502UKP045 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6502UKP045 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 MAX6502UKP045?
For technical support, including MAX6502UKP045 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6502UKP045 requirements.
6.How does Aetrix verify that MAX6502UKP045 is sourced from the original manufacturer or authorized distributors?
All MAX6502UKP045 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 MAX6502UKP045 meets industry standards.
7.What is the process for return or replacement of MAX6502UKP045?
All MAX6502UKP045 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6502UKP045, 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 MAX6502UKP045 part is unused and in its original packaging.
Return procedure for MAX6502UKP045:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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