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Analog Devices Inc./Maxim Integrated MAX6509CAUK
- Part No.:
- MAX6509CAUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6509CAUK.pdf
- Description:
- PROGRAMMABLE TEMPERATURE SWITCH
- Quantity:
- Payment:
- Shipping:
Inventory:523
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Product details
Overview
MAX6509CAUK from Maxim Integrated is a resistor-programmable SOT23-5 temperature switch with set-cold trip functionality, ±0.5°C typical threshold accuracy, 2°C or 10°C pin-selectable hysteresis, open-drain output, and operation from +2.7V to +5.5V supply. It interfaces directly with microprocessor reset inputs for thermal shutdown in embedded computing systems.
For engineers reviewing the MAX6509CAUK datasheet, MAX6509CAUK pinout, MAX6509CAUK application, or MAX6509CAUK equivalent, this page provides verified functional identity, validated SOT23-5 package mapping, confirmed -40°C to +85°C operating range, exact pin roles, and two technically documented alternative parts for thermal monitoring designs.
Technical Context
The MAX6509CAUK integrates dual temperature-dependent references (one positive, one negative TC) and a comparator to determine trip point. Its SET pin accepts a 1% external resistor to program thresholds from -40°C to +125°C, though the CAUK variant is rated for -40°C to +85°C.
Hysteresis is selected via HYST pin (GND = 2°C, VCC = 10°C); unconnected HYST increases supply current and is prohibited. The open-drain OUT sinks current only and requires an external pull-up for logic-high assertion - no internal pull-up is present, distinguishing it from the MAX6510 series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +2.7V to +5.5V - supports direct interface with 3.3V and 5V logic domains without level-shifting. |
| Temperature Range | -40°C to +85°C - industrial-grade operating envelope matching common PCB thermal profiles. |
| Threshold Accuracy | ±0.5°C (typ), ±4.7°C (max) - enables precise thermal event triggering without calibration. |
| Supply Current | 32µA (typ) - allows battery-backed or low-power always-on thermal monitoring. |
| Hysteresis Options | 2°C or 10°C (pin-selectable) - prevents output oscillation near trip point in noisy thermal environments. |
| Output Type | Open-drain - enables wired-OR configuration with other MAX6509 devices for window detection. |
| SET Resistor Tempco | ≤100ppm/°C (1% tolerance required) - ensures stable trip point across temperature with standard metal-film resistors. |
Pinout & Package
SOT23-5 package (drawing 21-0057), 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant (Pb-free option available as MAX6509CAUK+).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal references and comparator; must be low-impedance connection to system ground plane. |
| 2 | VCC | Positive supply input; bypass with 0.1µF ceramic capacitor close to pin for noise immunity. |
| 3 | OUT | Open-drain output; sinks current when asserted (trip condition met); requires external pull-up for logic-high state. |
| 4 | HYST | Hysteresis select input; connect to GND (2°C) or VCC (10°C); floating causes increased ICC and unreliable behavior. |
| 5 | SET | Temperature set-point input; connect 1% resistor between SET and GND to define trip temperature per datasheet equations. |
Key Features
| Feature | Design Value |
|---|---|
| Set-cold trip mode | Asserts output when temperature falls below programmed threshold - essential for low-temp alarm and cold-start protection. |
| Resistor-programmable threshold | Single 1% external resistor sets trip point across full -40°C to +125°C range; eliminates need for trimming or digital configuration. |
| Low quiescent current | 32µA typical ICC enables integration into power-constrained systems such as portable instrumentation and sensor nodes. |
| Wired-OR capability | Open-drain output allows direct connection of multiple MAX6509CAUK devices to a shared interrupt line using one pull-up resistor. |
| Thermal self-heating mitigation | Typical θJA = 115°C/W; <1.5mW added dissipation at 5mA sink ensures <0.2°C die-to-package offset under fan-control loads. |
Applications
| Microprocessor Thermal Reset | Fan Control Activation |
|---|---|
|
Use Scenario: Monitors CPU die temperature on high-speed computing boards where thermal runaway must trigger immediate reset before damage occurs. IC Role / Device Role / Timing Role: Set-cold configured MAX6509CAUK asserts OUT when temperature drops below safe startup threshold (e.g., -10°C), preventing boot under condensation or cold ambient. Use Value: Eliminates need for external ADC and firmware polling; provides hardware-level fail-safe reset with <1ms response latency. |
Use Scenario: Activates cooling fan when board temperature exceeds safe operating limit in industrial motor drives or power supplies. IC Role / Device Role / Timing Role: MAX6509CAUK configured as set-hot device drives fan enable line via transistor switch; HYST = GND selects 2°C hysteresis to prevent fan chatter near threshold. Use Value: Reduces system BOM by replacing discrete thermistor + comparator + hysteresis circuit with single 5-pin IC. |
| Temperature Window Detection | Fail-Safe Cold-Start Monitor |
|
Use Scenario: Detects out-of-range temperature in medical diagnostic equipment requiring operation only within +15°C to +40°C ambient. IC Role / Device Role / Timing Role: Paired MAX6509CAUK (set-cold) and MAX6509HAUK (set-hot) outputs wire-OR'd to single interrupt line; trip points defined by separate RSET values. Use Value: Achieves accurate window detection without microcontroller involvement; hysteresis prevents false triggers during slow thermal transients. |
Use Scenario: Ensures outdoor telecom equipment does not power up below minimum storage temperature (-40°C) to avoid electrolytic capacitor failure. IC Role / Device Role / Timing Role: MAX6509CAUK placed adjacent to power supply section; configured for -40°C trip; OUT holds system in reset until ambient rises above threshold. Use Value: Prevents irreversible component stress during cold power-on; operates independently of main controller firmware state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6509HAUK | Same SOT23-5 package, identical electrical specs, but set-hot trip mode (asserts on rising temperature) | Used where overtemperature shutdown is required instead of cold-start prevention | Select MAX6509HAUK when trip action must occur on temperature increase; MAX6509CAUK is mandatory for cold-trip use cases. |
| LM20BIM7 | Analog output temperature sensor (not switch); requires external comparator and hysteresis circuitry | Provides continuous temperature readout rather than binary trip signal | Choose LM20BIM7 only if analog feedback or variable threshold control is needed; MAX6509CAUK delivers simpler, lower-cost binary decision logic. |
Compared with MAX6509HAUK, the MAX6509CAUK provides inverted trip polarity critical for cold-start lockout; compared with LM20BIM7, it eliminates external components and reduces design cycle time for fixed-threshold alarms.
Availability
MAX6509CAUK is available at Aetrix Electronics and suitable for microprocessor thermal reset, fan control activation, and temperature window detection requiring stable component supply across industrial, computing, and telecom applications.
Supply support for MAX6509CAUK 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 demanding industrial, automotive, and communications applications.
The MAX6509CAUK belongs to Maxim's resistor-programmable temperature switch product line, engineered for cost-sensitive, space-constrained thermal monitoring where programmability, accuracy, and low power are essential.
FAQ
What is the operating temperature range of the MAX6509CAUK?
The MAX6509CAUK is specified for operation from -40°C to +85°C. This range is distinct from the wider -40°C to +125°C capability of the MAX6509 family's H-grade variants. The CAUK suffix explicitly denotes the commercial temperature grade, validated per Maxim's datasheet Rev 2 (19-1617).
Does the MAX6509CAUK include an internal pull-up resistor on the OUT pin?
No, the MAX6509CAUK has an open-drain output without internal pull-up. Unlike the MAX6510 series, it requires an external pull-up resistor (typically 10kΩ) on the OUT pin to assert a logic-high state when de-asserted. This is confirmed in the Pin Description table and Typical Operating Circuit (Figure 2) of the MAX6509/MAX6510 datasheet.
How is hysteresis selected on the MAX6509CAUK?
Hysteresis on the MAX6509CAUK is selected by connecting the HYST pin to either GND (2°C hysteresis) or VCC (10°C hysteresis). The datasheet explicitly warns against leaving HYST unconnected, as it increases supply current and causes undefined behavior. This pin-selectable feature is electrically validated and tested across temperature.
What does the 'C' suffix in MAX6509CAUK indicate?
The 'C' in MAX6509CAUK denotes the commercial temperature grade (-40°C to +85°C), while the 'A' indicates assembly/test at Maxim's facility, and 'UK' specifies the SOT23-5 package. This full suffix is documented in Maxim's ordering information table and corresponds to drawing code U5-1* per package outline 21-0057.
Can the MAX6509CAUK be used for temperature window detection?
Yes, the MAX6509CAUK can be paired with a set-hot variant (e.g., MAX6509HAUK) to implement temperature window detection. Their open-drain outputs can be wire-OR'd using a single external pull-up resistor, as shown in Figure 5 of the datasheet. This configuration requires no additional logic and maintains independent trip point programming for each device.
MAX6509CAUK 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:
- Programmable
- Accuracy:
- ±4.7°C
- Current - Output (Max):
- 20mA
- Output Type:
- Open Drain
- Output:
- Active Low
- Output Function:
- /OverTemp
- Selectable Hysteresis:
- Yes
- Features:
- Selectable Trip Point
- Voltage - Supply:
- 2.7 V ~ 5.5 V
- Current - Supply:
- 32µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-5
MAX6509CAUK FAQ
1.How can I place an order for MAX6509CAUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6509CAUK 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 MAX6509CAUK reliable?
The price and inventory of MAX6509CAUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6509CAUK is usually 5 days.
3.What payment methods are accepted for MAX6509CAUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6509CAUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6509CAUK?
MAX6509CAUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6509CAUK 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 MAX6509CAUK?
For technical support, including MAX6509CAUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6509CAUK requirements.
6.How does Aetrix verify that MAX6509CAUK is sourced from the original manufacturer or authorized distributors?
All MAX6509CAUK 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 MAX6509CAUK meets industry standards.
7.What is the process for return or replacement of MAX6509CAUK?
All MAX6509CAUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX6509CAUK, 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 MAX6509CAUK part is unused and in its original packaging.
Return procedure for MAX6509CAUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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