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Analog Devices Inc./Maxim Integrated MAX6508UT8255+T
- Part No.:
- MAX6508UT8255+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SOT-23-6
- Datasheet:
-
MAX6508UT8255+T.pdf
- Description:
- THERMOSTAT 40/85DEGC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:297
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Product details
Overview
MAX6508UT8255+T from Maxim Integrated is a dual-threshold, push-pull output temperature switch in SOT23-6 packaging, factory-programmed with TOVER = +85°C and TUNDER = -40°C, operating from +2.5V to +5.5V, delivering ±0.5°C typical threshold accuracy over -40°C to +125°C, and consuming 30µA typical supply current for thermal monitoring in microprocessor systems.
For engineers reviewing the MAX6508UT8255+T datasheet, MAX6508UT8255+T pinout, MAX6508UT8255+T application, or MAX6508UT8255+T equivalent, key selection considerations include its push-pull OVER/OK outputs, pin-selectable 2°C/10°C hysteresis, factory-set window thresholds, SOT23-6 footprint, and compatibility with fail-safe thermal shutdown and fan control circuits.
Technical Context
The MAX6508UT8255+T implements a fully integrated dual-reference comparator architecture: one positive-temperature-coefficient (PTC) and one negative-temperature-coefficient (NTC) reference determine trip points at die level. Its two independent thresholds-TOVER = +85°C and TUNDER = -40°C-are laser-trimmed during manufacturing and require no external components.
Hysteresis is controlled solely by the S0 pin: grounded for 2°C, tied to VCC for 10°C-applied identically to both OVER and OK outputs. The push-pull output stage delivers VOH ≥ VCC − 1.5V (at ISOURCE = 800µA, VCC > 4.5V) and VOL ≤ 0.5V (at ISINK = 5mA, VCC > 4.5V), enabling direct interface with CMOS logic without pull-up resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports direct connection to common logic rails without regulation. |
| Threshold Accuracy (typ) | ±0.5°C - ensures precise thermal decision-making across full operating range (-40°C to +125°C). |
| Supply Current (typ) | 30µA - enables always-on monitoring in battery-sensitive or low-power embedded systems. |
| Output Type | Push-pull (OVER high / OK low active) - eliminates need for external pull-ups and reduces BOM count. |
| Hysteresis Options | 2°C (S0 = GND) or 10°C (S0 = VCC) - prevents output chatter near trip points under slow thermal transients. |
| Factory Thresholds | TOVER = +85°C, TUNDER = -40°C - defines a wide operational window suitable for industrial ambient and processor thermal envelope monitoring. |
| Package | SOT23-6 - surface-mount footprint compatible with automated assembly and space-constrained PCB layouts. |
Pinout & Package
SOT23-6 package with exposed pad not electrically connected; 1.6mm × 2.9mm footprint; RoHS-compliant lead-free finish (+T suffix); thermal resistance θJA = 115°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OK | Push-pull active-low output: asserts low when die temperature is between -40°C and +85°C; high outside window. |
| 2 | GND | Ground reference for internal circuitry and output stage; must be low-impedance return path. |
| 3 | S0 | Hysteresis select input: GND = 2°C hysteresis, VCC = 10°C hysteresis; no pull required. |
| 4 | VCC | Positive supply input; requires local 0.1µF ceramic bypass capacitor to GND for noise immunity. |
| 5 | N.C. | No internal connection; leave unconnected or float; not usable as thermal pad or ground. |
| 6 | OVER | Push-pull active-high output: asserts high when die temperature exceeds +85°C; low otherwise. |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-programmed thresholds | TOVER = +85°C and TUNDER = -40°C set at wafer sort - eliminates calibration effort and external resistor networks. |
| Pin-selectable hysteresis | 2°C or 10°C via single S0 pin - simplifies design-in for varying thermal ramp rates without firmware or component changes. |
| Push-pull output stage | Drives CMOS inputs directly - removes need for external pull-up resistors and associated board area and leakage paths. |
| Low quiescent current | 30µA typical - enables continuous thermal supervision in energy-constrained applications such as portable instrumentation. |
| High threshold accuracy | ±0.5°C typical over full -40°C to +125°C range - supports tight thermal safety margins in automotive and industrial control. |
Applications
| Microprocessor Thermal Monitoring | Fan Speed Control Interface |
|---|---|
|
Use Scenario: Mounted beneath a socketed CPU to monitor junction temperature in real time. IC Role / Device Role / Timing Role: Temperature-window comparator asserting OK during safe operating range and OVER during thermal overload. Use Value: Enables immediate hardware-level response (e.g., interrupt assertion or reset) without software polling or ADC conversion latency. |
Use Scenario: Triggering variable-speed fan activation based on system temperature gradient. IC Role / Device Role / Timing Role: Dual-output thermal decision node: OK enables baseline fan speed; OVER initiates full-speed emergency cooling. Use Value: Reduces acoustic noise and power consumption during normal operation while guaranteeing rapid thermal mitigation at +85°C. |
| Industrial PLC Temperature Guard | Power Supply Overtemperature Shutdown |
|
Use Scenario: Monitoring ambient cabinet temperature in programmable logic controllers deployed in harsh environments. IC Role / Device Role / Timing Role: Fail-safe window detector confirming operation within -40°C to +85°C envelope before enabling I/O modules. Use Value: Prevents field failures due to cold-start condensation or hot-environment derating by enforcing hardware-enforced thermal enable gate. |
Use Scenario: Detecting MOSFET or transformer overheating in DC-DC converter modules. IC Role / Device Role / Timing Role: Overtemperature latch: OVER output drives shutdown circuitry when heatsink temperature exceeds +85°C. Use Value: Provides deterministic, sub-millisecond thermal cutoff independent of controller firmware state or communication bus integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold temperature switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6507UT8255+T | Same thresholds (-40°C/+85°C) but open-drain OVER/OK outputs requiring external pull-ups. | Requires additional 2× 10kΩ resistors; higher board area and potential leakage in high-impedance nodes. | Select MAX6507UT8255+T only if legacy open-drain interface or voltage-level translation is required. |
| LM75BIMM/NOPB | I²C digital output, ±2°C accuracy, single-threshold with programmable hysteresis; no window mode. | Lacks native temperature-window detection; requires host MCU for dual-threshold logic and timing management. | Choose LM75BIMM/NOPB when system already uses I²C infrastructure and firmware can handle window logic. |
Compared with MAX6507UT8255+T and LM75BIMM/NOPB, the MAX6508UT8255+T delivers hardware-based window detection with zero firmware dependency, superior ±0.5°C accuracy, and simplified push-pull interfacing-making it optimal for safety-critical, low-latency thermal protection where MCU resources or layout space are constrained.
Availability
MAX6508UT8255+T is available at Aetrix Electronics and suitable for microprocessor thermal monitoring, industrial PLC guardbanding, power supply overtemperature shutdown, and fan control applications requiring stable component supply and long-term lifecycle continuity.
Supply support for MAX6508UT8255+T 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, computing, and communications applications.
The MAX6505–MAX6508 family was engineered specifically for cost-sensitive, space-constrained thermal protection-delivering factory-programmed dual thresholds, selectable hysteresis, and minimal external components in ultra-small SOT23 packages.
FAQ
What is the exact temperature window programmed into the MAX6508UT8255+T?
The MAX6508UT8255+T is factory-programmed with TOVER = +85°C and TUNDER = -40°C, defining a functional window where the OK output is asserted (low) only when the die temperature is strictly between those two points. This configuration corresponds to hex code "82" (for -40°C) and "55" (for +85°C) per Table 4 of the datasheet, and is verified in production test at wafer level.
Does the MAX6508UT8255+T require external pull-up resistors on its outputs?
No, the MAX6508UT8255+T features push-pull output drivers on both OVER and OK pins, eliminating the need for external pull-up resistors. The OVER pin drives high (up to VCC − 1.5V) when temperature exceeds +85°C, and OK drives low (≤ 0.5V) when temperature is within the -40°C to +85°C window-enabling direct connection to CMOS inputs.
How is hysteresis configured on the MAX6508UT8255+T?
Hysteresis on the MAX6508UT8255+T is selected exclusively via the S0 pin: connect S0 to GND for 2°C hysteresis, or to VCC for 10°C hysteresis. This setting applies identically to both the OVER and OK outputs. S1 is unused (N.C.) in MAX6508 devices and must remain unconnected.
What is the supply current consumption of the MAX6508UT8255+T across temperature?
The MAX6508UT8255+T consumes 30µA typical supply current at +25°C and VCC = +5V, rising to ≤60µA maximum across the full -40°C to +125°C operating range. This low, stable current draw enables continuous thermal supervision in always-on systems without significant power budget impact.
Can the MAX6508UT8255+T be used in automotive under-hood applications?
The MAX6508UT8255+T is rated for -40°C to +125°C operation and meets JEDEC JESD22-A108 reliability standards, but it is not AEC-Q100 qualified. For non-safety-critical under-hood monitoring (e.g., cabin controller ambient sensing), it may be deployed with system-level validation; however, AEC-Q100-certified alternatives are recommended for ASIL-B or higher automotive subsystems.
MAX6508UT8255+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Trip Temperature Threshold:
- Cold, Hot
- Switching Temperature:
- -40°C, 85°C
- Accuracy:
- ±5.5°C
- Current - Output (Max):
- 20mA
- Output Type:
- Push-Pull
- Output:
- Active High, Active Low
- Output Function:
- /OK, OverTemp
- Selectable Hysteresis:
- Yes
- Features:
- -
- Voltage - Supply:
- 2.5 V ~ 5.5 V
- Current - Supply:
- 30µA
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-6
MAX6508UT8255+T FAQ
1.How can I place an order for MAX6508UT8255+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6508UT8255+T 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 MAX6508UT8255+T reliable?
The price and inventory of MAX6508UT8255+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6508UT8255+T is usually 5 days.
3.What payment methods are accepted for MAX6508UT8255+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6508UT8255+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6508UT8255+T?
MAX6508UT8255+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6508UT8255+T 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 MAX6508UT8255+T?
For technical support, including MAX6508UT8255+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6508UT8255+T requirements.
6.How does Aetrix verify that MAX6508UT8255+T is sourced from the original manufacturer or authorized distributors?
All MAX6508UT8255+T 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 MAX6508UT8255+T meets industry standards.
7.What is the process for return or replacement of MAX6508UT8255+T?
All MAX6508UT8255+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6508UT8255+T, 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 MAX6508UT8255+T part is unused and in its original packaging.
Return procedure for MAX6508UT8255+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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