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Analog Devices Inc./Maxim Integrated MAX6503UKN035
- Part No.:
- MAX6503UKN035
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6503UKN035.pdf
- Description:
- MICROPOWER TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:1,571
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Product details
Overview
MAX6503UKN035 from Maxim Integrated is a cold-temperature threshold, open-drain, micropower temperature switch with factory-trimmed trip point of -35°C, ±0.5°C typical accuracy, 2.7V–5.5V supply range, and 30µA quiescent current. It asserts an active-low output when die temperature falls below -35°C and is used for low-temperature alarm and system shutdown in embedded thermal management.
For engineers reviewing the MAX6503UKN035 datasheet, MAX6503UKN035 pinout, MAX6503UKN035 application, or MAX6503UKN035 equivalent, this device delivers precise cold-temperature detection in SOT23-5 with pin-selectable 2°C/10°C hysteresis, no external components required, and compatibility with µP reset inputs in space-constrained industrial and computing systems.
Technical Context
The MAX6503UKN035 integrates two on-die temperature-dependent voltage references (one positive, one negative TC) and a comparator to define its -35°C trip point. Its open-drain TUNDER output sinks current only and requires an external pullup resistor (e.g., 100kΩ), enabling level-shifting above VCC.
Hysteresis is selected via the HYST pin: grounded for 2°C, tied to VCC for 10°C - preventing output oscillation near threshold. The device features internal power-on reset guaranteeing defined output state for 50µs at startup and operates across -55°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Threshold | -35°C factory-programmed cold-trip point; triggers output low when die temperature falls below this value |
| Threshold Accuracy | ±0.5°C (typ), ±6°C (max); enables high-confidence low-temp alarm without calibration |
| Supply Voltage Range | +2.7V to +5.5V; compatible with 3.3V and 5V logic rails and battery-backed systems |
| Supply Current | 30µA (typ); supports always-on thermal monitoring in ultra-low-power applications |
| Output Type | Active-low, open-drain TUNDER; allows wired-OR with other switches and level-flexible interfacing |
| Hysteresis Options | PIN-selectable 2°C (HYST = GND) or 10°C (HYST = VCC); prevents chatter during slow thermal transitions |
| 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 die-to-PCB heat transfer |
| 3 HYST | Hysteresis select input | CMOS-compatible; tie to GND for 2°C hysteresis, VCC for 10°C; floating causes increased ICC |
| 4 VCC | Positive supply input | Accepts +2.7V to +5.5V; powers internal references, comparator, and output stage |
| 5 TUNDER | Active-low open-drain output | Sinks current when TDI < -35°C; requires external pullup; supports voltage higher than VCC |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed -35°C trip point | Eliminates need for external calibration or trimming resistors in cold-alarm designs |
| ±0.5°C typical threshold accuracy | Reduces false alarms in precision low-temperature monitoring (e.g., battery cold-charge lockout) |
| No external components required | Enables single-chip thermal protection with only a pullup resistor - minimal BOM and layout area |
| 30µA supply current | Supports continuous monitoring in energy-harvested or coin-cell-powered systems |
| Pin-selectable hysteresis | Allows design flexibility: tight 2°C control for stable setpoints or wide 10°C margin for noisy thermal environments |
Applications
| Industrial Freezer Monitoring | Low-Temperature Battery Protection |
|---|---|
Use Scenario: Monitoring storage environment for lithium-ion batteries in arctic logistics or cold-chain transport. IC Role / Device Role / Timing Role: Cold-temperature switch asserting system shutdown when ambient drops below -35°C to prevent irreversible cell damage. Use Value: Prevents plating and dendrite formation by disabling charge/discharge circuits before electrolyte freezing occurs. |
Use Scenario: Embedded battery management in outdoor IoT sensors operating down to -40°C. IC Role / Device Role / Timing Role: Die-temperature sensor triggering MCU reset or sleep mode entry when cell temperature falls below safe operating limit. Use Value: Enables fail-safe operation with 30µA quiescent draw - extends shelf life and field deployment duration. |
| Telecom Equipment Cold-Start Assurance | Medical Diagnostic Instrument Low-Temp Alarm |
Use Scenario: Base station radios deployed in northern climates requiring verified functionality after sub-zero power-up. IC Role / Device Role / Timing Role: Cold-trip monitor verifying minimum operating temperature before enabling RF amplifiers and clock synthesis. Use Value: Avoids parametric failure and thermal stress by gating power-on sequence until die reaches -35°C or above. |
Use Scenario: Portable ultrasound or blood analyzer requiring operational validation below 0°C during field use. IC Role / Device Role / Timing Role: Directly mounted under microcontroller to detect enclosure cold soak and inhibit unsafe self-test sequences. Use Value: Meets IEC 60601-1 environmental compliance with traceable, factory-calibrated cold-threshold response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar cold-temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6503UKN025 | Factory-trimmed -25°C trip point; identical package, pinout, and electrical specs except threshold | Triggers at warmer cold limit; suitable where -25°C is system-defined alarm boundary | Select when thermal margin must be less aggressive than -35°C - e.g., for wider ambient tolerance in consumer electronics |
| LM75BIMM/NOPB | Digital I²C temperature sensor with programmable thresholds; 8-pin VSSOP; requires MCU firmware support | Provides full temperature readback and dual over/under thresholds; not a direct hardware reset solution | Choose when system needs diagnostic logging or adaptive trip points - not for simple hardware reset assertion |
Compared with MAX6503UKN035, MAX6503UKN025 offers a +10°C warmer trip point with identical form/function, while LM75BIMM/NOPB adds digital interface and measurement capability at the cost of added software complexity and larger footprint - neither is pin-compatible, but both serve adjacent cold-monitoring roles.
Availability
MAX6503UKN035 is available at Aetrix Electronics and suitable for industrial freezer monitoring, low-temperature battery protection, telecom cold-start assurance, medical diagnostic instrument alarms, and embedded thermal shutdown requiring stable component supply and long-lifecycle support.
Supply support for MAX6503UKN035 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, with emphasis on integration, reliability, and low-power operation.
The MAX6501–MAX6504 family was designed specifically for cost-sensitive, space-constrained thermal monitoring - delivering factory-calibrated temperature switching in SOT23-5 with zero external components and micropower operation.
FAQ
What is the exact factory-programmed temperature threshold of the MAX6503UKN035?
The MAX6503UKN035 has a factory-programmed cold-temperature trip threshold of -35°C. This means the TUNDER output goes active-low when the die temperature falls below -35°C. The threshold is trimmed during manufacturing and specified with ±0.5°C typical accuracy over the full operating range, as confirmed in the device's Selector Guide and Table 2 marking code documentation.
Does the MAX6503UKN035 require external components to operate?
No, the MAX6503UKN035 requires no external components for basic operation. Only an external pullup resistor on the TUNDER pin is needed to establish the logic-high state when the output is inactive. The device integrates all necessary references, comparator, and hysteresis control - making it a true single-component thermal switch solution.
How is hysteresis configured on the MAX6503UKN035?
Hysteresis on the MAX6503UKN035 is configured via the HYST pin: connect HYST to GND for 2°C hysteresis or to VCC for 10°C hysteresis. The datasheet explicitly warns against leaving HYST floating, as that increases supply current. The actual hysteresis value also varies slightly with the programmed trip point, as shown in Figure MAX6501 TOC8.
Can the MAX6503UKN035 output drive a microprocessor reset input directly?
Yes, the MAX6503UKN035's open-drain TUNDER output is specifically intended to interface with a microprocessor reset input. When the die temperature drops below -35°C, TUNDER pulls low - asserting reset. A pullup resistor (e.g., 100kΩ) completes the interface, and the output can be pulled up to a voltage higher than VCC, enabling flexible voltage-domain interfacing.
What is the operating temperature range and supply voltage specification for the MAX6503UKN035?
The MAX6503UKN035 operates across an ambient temperature range of -55°C to +125°C and accepts a supply voltage from +2.7V to +5.5V. These specifications are guaranteed over the full range, with supply current remaining stable at 30µA typical. Absolute maximum ratings extend to -65°C storage and +7V supply, but functional operation is validated only within the stated ranges.
MAX6503UKN035 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:
- -35°C
- Accuracy:
- ±6°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
MAX6503UKN035 FAQ
1.How can I place an order for MAX6503UKN035 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6503UKN035 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 MAX6503UKN035 reliable?
The price and inventory of MAX6503UKN035 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6503UKN035 is usually 5 days.
3.What payment methods are accepted for MAX6503UKN035?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6503UKN035 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6503UKN035?
MAX6503UKN035 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6503UKN035 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 MAX6503UKN035?
For technical support, including MAX6503UKN035 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6503UKN035 requirements.
6.How does Aetrix verify that MAX6503UKN035 is sourced from the original manufacturer or authorized distributors?
All MAX6503UKN035 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 MAX6503UKN035 meets industry standards.
7.What is the process for return or replacement of MAX6503UKN035?
All MAX6503UKN035 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6503UKN035, 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 MAX6503UKN035 part is unused and in its original packaging.
Return procedure for MAX6503UKN035:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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