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Analog Devices Inc./Maxim Integrated MAX6503UKN005
- Part No.:
- MAX6503UKN005
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6503UKN005.pdf
- Description:
- MICROPOWER TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,377
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Product details
Overview
MAX6503UKN005 from Maxim Integrated is a cold-temperature threshold, open-drain, micropower temperature switch with factory-programmed trip point of –5°C, ±0.5°C typical accuracy, 2°C/10°C pin-selectable hysteresis, and 30µA supply current. It operates from +2.7V to +5.5V and interfaces directly with µP reset inputs in thermal monitoring circuits for industrial controllers and embedded systems.
For engineers reviewing the MAX6503UKN005 datasheet, MAX6503UKN005 pinout, MAX6503UKN005 application, or MAX6503UKN005 equivalent, this device delivers precise sub-zero temperature detection with no external components, SOT23-5 footprint compatibility, and verified cold-trip behavior for fail-safe system shutdown and alarm triggering.
Technical Context
The MAX6503UKN005 integrates two on-die temperature-dependent voltage references (one positive, one negative TC) whose intersection defines the –5°C trip point. Its comparator output drives an active-low open-drain stage, requiring only a pull-up resistor for µP reset assertion.
Hysteresis is selected via the HYST pin: grounded for 2°C, tied to VCC for 10°C - a configuration confirmed in the Pin Description and Typical Operating Characteristics. The device features internal power-on reset guaranteeing stable output for 50µs at startup and operates across –55°C to +125°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Threshold | –5°C factory-programmed cold-trip point; asserts output low when die temperature falls below –5°C |
| Threshold Accuracy | ±0.5°C (typ), ±6°C (max); enables reliable sub-zero alarm triggering without calibration |
| Supply Voltage Range | +2.7V to +5.5V; compatible with 3.3V and 5V logic rails in embedded control systems |
| Supply Current | 30µA typical; supports battery-powered or ultra-low-power thermal monitoring |
| Output Type | Active-low open-drain; sinks up to 1.2mA, compatible with standard µP reset inputs and external pull-ups |
| Hysteresis | PIN-selectable 2°C (HYST = GND) or 10°C (HYST = VCC); prevents output oscillation near trip point |
| Package | SOT23-5; compact 2.9mm × 1.6mm footprint with Pin 2 optimized for lowest thermal resistance to die |
Pinout & Package
SOT23-5 package with exposed thermal pad not electrically connected; Pin 2 provides lowest thermal resistance path to die for accurate sensing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | GND | Ground reference; both pins must be connected together near chip; Pin 2 is thermally critical for sensing accuracy |
| 3 | HYST | Hysteresis select input; CMOS-compatible; tie to GND for 2°C hysteresis, to VCC for 10°C; must not float |
| 4 | VCC | Positive supply input; accepts +2.7V to +5.5V; powers internal references and comparator |
| 5 | TUNDER | Active-low open-drain output; sinks current when die temperature falls below –5°C; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed cold threshold | –5°C trip point laser-trimmed at wafer level; eliminates need for external calibration or trimming components |
| No external components required | Self-contained sensing and switching; only pull-up resistor needed on TUNDER for µP interface |
| Pin-selectable hysteresis | 2°C or 10°C hysteresis selected by single HYST pin connection; avoids BOM proliferation for different stability needs |
| Micropower operation | 30µA supply current enables >1-year battery life in coin-cell–powered thermal alarms |
| Thermal design optimization | Pin 2 designated as lowest-θJA path; enables direct mounting under µP sockets for accurate processor temperature monitoring |
Applications
| Industrial PLC Temperature Alarm | Embedded System Cold-Start Monitor |
|---|---|
Use Scenario: Monitors ambient cabinet temperature in programmable logic controllers to prevent operation below –5°C, avoiding condensation-induced failure. IC Role / Device Role / Timing Role: Cold-temperature switch asserting active-low reset signal to halt CPU boot sequence until safe temperature is reached. Use Value: Prevents firmware corruption and mechanical stress during cold-start; leverages ±0.5°C accuracy to meet IEC 61131-2 environmental compliance. |
Use Scenario: Detects sub-zero temperature before power-up in outdoor IoT gateways deployed in northern climates. IC Role / Device Role / Timing Role: Standalone cold-trip sensor driving µP reset line; ensures system remains held in reset until die temperature exceeds –5°C. Use Value: Eliminates need for software-based temperature polling; reduces boot-time latency and firmware complexity. |
| Medical Diagnostic Equipment Safety Interlock | Automotive ECUs Low-Temperature Validation |
Use Scenario: Verifies operating environment meets minimum –5°C specification before enabling high-voltage subsystems in portable ultrasound units. IC Role / Device Role / Timing Role: Hardware-level safety interlock; open-drain output wired-OR'd with other fault signals to global shutdown bus. Use Value: Provides fail-safe, analog-domain validation independent of MCU health; meets ISO 13485 risk management requirements. |
Use Scenario: Validates cold-weather startup capability of engine control units during production test at –40°C chambers. IC Role / Device Role / Timing Role: Cold-threshold detector feeding dedicated diagnostic GPIO; triggers automated pass/fail logging at –5°C boundary. Use Value: Enables deterministic, repeatable cold-margin testing without thermal chamber dwell time extension. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar cold-temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6503UKP005 | Same core functionality but hot-trip variant (+5°C); differs in polarity of trip condition and internal reference alignment | Designed for overtemperature detection, not cold-alarm; incompatible for sub-zero assertion use cases | Select only if application requires hot-trip behavior above +5°C instead of cold-trip below –5°C |
| LM20BIMAX/NOPB | Analog temperature sensor (output voltage proportional to temp); no built-in comparator or digital output; requires external circuitry for switching | Used where variable temperature readout is needed; not suitable for direct reset/assertion without ADC and firmware logic | Choose only when continuous temperature measurement is required alongside threshold detection |
Compared with MAX6503UKN005, MAX6503UKP005 serves opposite thermal polarity and cannot substitute in cold-alarm roles, while LM20BIMAX/NOPB lacks integrated switching and increases BOM count and firmware dependency - making MAX6503UKN005 the optimal choice for simple, reliable, hardware-based –5°C cold-trip assertion.
Availability
MAX6503UKN005 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive ECU validation, and embedded cold-start monitors requiring stable component supply and long-term lifecycle support.
Supply support for MAX6503UKN005 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 industrial, medical, and communications applications, emphasizing integration, reliability, and low-power operation.
The MAX6501–MAX6504 family was engineered specifically for cost-sensitive, space-constrained thermal monitoring - delivering factory-trimmed thresholds, micropower consumption, and SOT23 packaging for direct integration into µP reset and fan-control paths.
FAQ
What is the exact temperature trip point of the MAX6503UKN005?
The MAX6503UKN005 has a factory-programmed cold-temperature trip point of –5°C. This means its TUNDER output goes low when the die temperature falls below –5°C. The trip point is laser-trimmed during manufacturing and specified with ±0.5°C typical accuracy across the full operating range, as confirmed in the Electrical Characteristics table and Selector Guide.
Does the MAX6503UKN005 require external components to operate?
No, the MAX6503UKN005 requires no external passive components for basic operation. Only an external pull-up resistor on the TUNDER pin is needed to interface with a microprocessor reset input. The device integrates both temperature-dependent references, a comparator, and hysteresis control - eliminating the need for discrete sensors, op-amps, or resistive dividers in cold-trip detection circuits.
How is hysteresis configured on the MAX6503UKN005?
Hysteresis on the MAX6503UKN005 is configured via the HYST pin: connect HYST to GND for 2°C hysteresis or to VCC for 10°C hysteresis. This selection is explicitly documented in the Pin Description and Typical Operating Characteristics. Leaving HYST floating is prohibited, as it increases supply current and risks undefined output behavior near the trip point.
What is the supply voltage range and current consumption of the MAX6503UKN005?
The MAX6503UKN005 operates from +2.7V to +5.5V and draws 30µA typical supply current at +25°C. This micropower consumption is validated across temperature in the Typical Operating Characteristics plot (Figure MAX6501 TOC01), supporting battery-backed and energy-efficient thermal monitoring applications without compromising response time or accuracy.
Can the MAX6503UKN005 be used in a temperature window alarm configuration?
Yes, the MAX6503UKN005 is designed for temperature window alarms when paired with a hot-trip device like MAX6501UKP075. Its open-drain TUNDER output can be wire-OR'd with another device's TOVER output using a single pull-up resistor (as shown in Figure 4), generating a unified "out-of-range" signal when temperature falls below –5°C or rises above the companion hot threshold - all without additional logic ICs.
MAX6503UKN005 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:
- Cold
- Switching Temperature:
- -5°C
- Accuracy:
- ±4°C
- Current - Output (Max):
- 20mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /UnderTemp
- 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
MAX6503UKN005 FAQ
1.How can I place an order for MAX6503UKN005 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6503UKN005 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 MAX6503UKN005 reliable?
The price and inventory of MAX6503UKN005 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6503UKN005 is usually 5 days.
3.What payment methods are accepted for MAX6503UKN005?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6503UKN005 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6503UKN005?
MAX6503UKN005 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6503UKN005 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 MAX6503UKN005?
For technical support, including MAX6503UKN005 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6503UKN005 requirements.
6.How does Aetrix verify that MAX6503UKN005 is sourced from the original manufacturer or authorized distributors?
All MAX6503UKN005 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 MAX6503UKN005 meets industry standards.
7.What is the process for return or replacement of MAX6503UKN005?
All MAX6503UKN005 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6503UKN005, 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 MAX6503UKN005 part is unused and in its original packaging.
Return procedure for MAX6503UKN005:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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