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Analog Devices Inc./Maxim Integrated MAX6504UKN045
- Part No.:
- MAX6504UKN045
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6504UKN045.pdf
- Description:
- MICROPOWER TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:2,228
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Product details
Overview
MAX6504UKN045 from Maxim Integrated is a cold-temperature threshold, push-pull output temperature switch with factory-programmed trip point of -45°C, ±0.5°C typical accuracy, 2.7V to 5.5V supply range, and 30µA quiescent current. It asserts an active-high signal when die temperature falls below -45°C and is used in thermal underrange alarms for industrial controllers and embedded power systems.
For engineers reviewing the MAX6504UKN045 datasheet, MAX6504UKN045 pinout, MAX6504UKN045 application, or MAX6504UKN045 equivalent, key selection criteria include cold-trip behavior, pin-selectable hysteresis (2°C or 10°C), SOT23-5 package compatibility, push-pull drive capability (800µA source / 3.2mA sink), and operation across -55°C to +135°C ambient.
Technical Context
The MAX6504UKN045 integrates two on-die temperature-dependent voltage references-one with positive and one with negative temperature coefficient-whose intersection defines the -45°C trip point. Its internal comparator drives a push-pull output stage that sources up to 800µA at VCC > 4.5V and sinks up to 3.2mA.
Hysteresis is selected via the HYST pin: grounded for 2°C, tied to VCC for 10°C. The device features internal power-on reset guaranteeing defined output state for 50µs at startup and operates without external components beyond optional pull-up resistors for open-drain variants (not applicable here).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Temperature Threshold | -45°C cold-trip point; output goes high when die temperature falls below this value |
| Threshold Accuracy | ±0.5°C typical over full operating range; enables precise low-temperature alarm triggering |
| Supply Voltage Range | +2.7V to +5.5V; compatible with 3.3V and 5V logic rails without level-shifting |
| Quiescent Current | 30µA typical; supports battery-powered or ultra-low-power thermal monitoring |
| Output Type | Push-pull active-high; directly drives fan control logic or CMOS inputs without external pull-up |
| Hysteresis Options | PIN-selectable 2°C (HYST = GND) or 10°C (HYST = VCC); prevents output oscillation near trip point |
| Operating Temp Range | -55°C to +135°C ambient; validated for industrial and extended-temperature environments |
Pinout & Package
SOT23-5 package with exposed pad not electrically connected; thermal resistance θJA = 140°C/W; pins 1 and 2 are both GND with pin 2 offering lowest thermal resistance to die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 GND | Ground reference | Both pins must be connected together near chip; pin 2 provides optimal thermal path to die |
| 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, comparator, and output stage |
| 5 TUNDER | Active-high push-pull output | Goes high when die temperature falls below -45°C; sinks 3.2mA / sources 800µA |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed cold threshold | -45°C trip point laser-trimmed during production; eliminates calibration overhead |
| No external components required | Self-contained sensing and switching; no resistors, capacitors, or trimming needed |
| Low thermal self-heating | 30µA supply current + low output loading limits ΔTJ to <0.05°C under typical conditions |
| Robust output drive | Push-pull stage delivers rail-to-rail logic levels with 3.2mA sink capability for direct interface to fan drivers or logic gates |
| Fail-safe power-on reset | Internal POR holds output in known state for 50µs at startup; prevents spurious alarms during power ramp |
Applications
| Industrial PLC Thermal Safety | Telecom Power Shelf Monitoring |
|---|---|
Use Scenario: Monitors baseplate temperature in outdoor telecom power shelves to prevent operation below minimum storage spec (-40°C). IC Role / Device Role / Timing Role: Cold-temperature switch asserting active-high signal when ambient drops below -45°C. Use Value: Prevents condensation-induced short circuits and electrolytic capacitor failure by disabling power sequencing until safe temperature is reached. |
Use Scenario: Detects sub-zero cooling failure in forced-air cooled telecom rectifier modules. IC Role / Device Role / Timing Role: Undertemperature alarm trigger feeding into system management controller. Use Value: Enables graceful shutdown before cold-induced solder joint fracture or mechanical stress damage occurs. |
| Medical Diagnostic Equipment Storage | Automotive Battery Management Preconditioning |
Use Scenario: Ensures MRI or ultrasound equipment remains above minimum storage temperature during winter transport. IC Role / Device Role / Timing Role: Cold-trip sensor interfacing directly with microcontroller GPIO to log underrange events. Use Value: Provides tamper-resistant, component-level verification that storage conditions met manufacturer's -40°C minimum requirement. |
Use Scenario: Verifies battery pack temperature exceeds -45°C before enabling high-current charging in EV battery preconditioning cycles. IC Role / Device Role / Timing Role: Dedicated cold-threshold monitor with push-pull output driving charge enable FET gate. Use Value: Eliminates need for ADC sampling and firmware threshold checking-reduces BOM count and boot-time latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar cold-temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6503UKN045 | Same -45°C cold threshold and SOT23-5 package, but open-drain active-low output | Requires external pull-up resistor; suited for wired-OR alarm buses or µP reset inputs | Select MAX6503UKN045 only if system requires open-drain signaling or shared interrupt lines |
| LM75BIMM-3/NOPB | Digital I²C temperature sensor with programmable thresholds; no factory-trimmed analog switch function | Provides full temperature readback and dual thresholds but adds MCU firmware dependency and I²C bus overhead | Choose LM75BIMM-3/NOPB only when digital temperature telemetry and flexible threshold reconfiguration are required |
Compared with MAX6504UKN045, MAX6503UKN045 offers identical thermal sensing but demands external biasing and lacks direct logic drive, while LM75BIMM-3/NOPB trades simplicity and deterministic response for configurability and measurement capability-making MAX6504UKN045 optimal for fixed-threshold, zero-firmware, high-reliability cold-alarm roles.
Availability
MAX6504UKN045 is available at Aetrix Electronics and suitable for industrial PLC thermal safety, telecom power shelf monitoring, medical diagnostic equipment storage, and automotive battery management preconditioning requiring stable component supply and long-term lifecycle support.
Supply support for MAX6504UKN045 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, and computing applications.
The MAX6501–MAX6504 family was designed specifically for low-cost, micropower, factory-trimmed temperature switching in space-constrained systems-emphasizing integration, accuracy, and ease of use over programmability.
FAQ
What is the exact temperature trip point of the MAX6504UKN045?
The MAX6504UKN045 has a factory-programmed cold-temperature trip threshold of -45°C. When the die temperature falls below this value, the TUNDER output transitions high. This threshold is laser-trimmed and specified with ±0.5°C typical accuracy over the full -55°C to +135°C operating range, as confirmed in the device's Electrical Characteristics table and Selector Guide.
Does the MAX6504UKN045 require external components to operate?
No, the MAX6504UKN045 requires no external components for basic operation. It integrates all necessary temperature references, comparator, and push-pull output stage. Only the HYST pin must be tied to either GND or VCC-no resistors, capacitors, or trimming networks are needed. This is explicitly stated in the Features section and General Description of the official datasheet.
How is hysteresis selected on the MAX6504UKN045?
Hysteresis on the MAX6504UKN045 is selected via the HYST pin: connect it to GND for 2°C hysteresis or to VCC for 10°C hysteresis. The datasheet warns that leaving HYST floating increases supply current and is prohibited. The actual hysteresis value also depends on the programmed trip point, as shown in the Typical Operating Characteristics plot "Hysteresis vs. Trip Temperature".
What is the output drive capability of the MAX6504UKN045?
The MAX6504UKN045 features a push-pull output capable of sourcing 800µA (VOH ≥ VCC – 1.5V at VCC > 4.5V) and sinking 3.2mA (VOL ≤ 0.4V at VCC > 4.5V). This allows direct interface with CMOS logic inputs, fan control ICs, or discrete transistor gates without external buffering-unlike the open-drain variants MAX6501/MAX6503 which require pull-up resistors.
Can the MAX6504UKN045 be used in a temperature window alarm configuration?
Yes, the MAX6504UKN045 is designed for temperature window alarms when paired with a hot-trip device like MAX6502UKP075. Its TUNDER output (active high below -45°C) can be ORed with a hot-trip device's TOVER output using discrete diodes or logic gates, as demonstrated in Figure 4 of the datasheet. This creates a combined out-of-range signal for thermal shutdown or recalibration triggers.
MAX6504UKN045 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:
- -45°C
- Accuracy:
- ±6°C
- Current - Output (Max):
- 20mA
- Output Type:
- Push-Pull
- Output:
- Active High
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Supplier Device Package:
- SOT-23-5
MAX6504UKN045 FAQ
1.How can I place an order for MAX6504UKN045 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6504UKN045 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 MAX6504UKN045 reliable?
The price and inventory of MAX6504UKN045 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6504UKN045 is usually 5 days.
3.What payment methods are accepted for MAX6504UKN045?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6504UKN045 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6504UKN045?
MAX6504UKN045 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6504UKN045 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 MAX6504UKN045?
For technical support, including MAX6504UKN045 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6504UKN045 requirements.
6.How does Aetrix verify that MAX6504UKN045 is sourced from the original manufacturer or authorized distributors?
All MAX6504UKN045 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 MAX6504UKN045 meets industry standards.
7.What is the process for return or replacement of MAX6504UKN045?
All MAX6504UKN045 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6504UKN045, 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 MAX6504UKN045 part is unused and in its original packaging.
Return procedure for MAX6504UKN045:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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