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Analog Devices Inc./Maxim Integrated MAX6508UT9155+T
- Part No.:
- MAX6508UT9155+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Thermostats - Solid State
- Package:
- SOT-23-6
- Datasheet:
-
MAX6508UT9155+T.pdf
- Description:
- THERMOSTAT 25/85DEGC SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,856
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Product details
Overview
MAX6508UT9155+T from Maxim Integrated is a dual-threshold, push-pull output temperature switch in SOT23-6 packaging, factory-programmed with TUNDER = +91°C and TOVER = +55°C (window mode), 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 microprocessor thermal monitoring and fan control.
For engineers reviewing the MAX6508UT9155+T datasheet, MAX6508UT9155+T pinout, MAX6508UT9155+T application, or MAX6508UT9155+T equivalent, key selection criteria include push-pull OVER/OK logic polarity, pin-selectable 2°C/10°C hysteresis via S0, factory-set window thresholds, SOT23 thermal coupling capability, and absence of external components for trip-point configuration.
Technical Context
The MAX6508UT9155+T implements a fully integrated BiCMOS temperature-sensing architecture with two factory-trimmed bandgap references-one positive and one negative temperature coefficient-whose intersection defines TOVER and TUNDER. It operates in temperature-window mode: OK asserts high when die temperature is strictly between +55°C and +91°C; OVER asserts high above +91°C.
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. No internal hysteresis is applied to the warning threshold since the device lacks WARN functionality (exclusive to MAX6505/MAX6506).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.5V to +5.5V - supports direct interface with 3.3V and 5V logic rails without level-shifting. |
| Threshold Accuracy (typ) | ±0.5°C - enables precise thermal margining in CPU/GPU thermal management without calibration. |
| Supply Current (typ) | 30µA - minimizes self-heating (<0.3°C die rise) and eliminates need for power-gating in always-on monitoring. |
| Factory-Set Thresholds | TUNDER = +55°C, TOVER = +91°C - defines a 36°C operational window optimized for industrial-grade processor thermal envelope control. |
| Output Type | Push-pull (active-high OVER, active-low OK) - drives logic inputs directly without pull-up resistors or external buffering. |
| Hysteresis Selection | Pin-selectable 2°C or 10°C via S0 - prevents output chatter during slow thermal transients near trip points. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and telecom base station environments. |
Pinout & Package
MAX6508UT9155+T is housed in a RoHS-compliant 6-pin SOT23 package (package code U6SN+1), with 1.3mm × 0.8mm footprint and 1.0mm height, optimized for PCB space-constrained thermal sensing adjacent to heat sources.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OK | Push-pull active-low output: low = temperature within window (+55°C < T < +91°C); high = out-of-window condition. |
| 2 | GND | Ground reference for internal bandgap references and output stage; must be low-impedance connection to minimize thermal measurement error. |
| 3 | S0 | Hysteresis select input: GND = 2°C hysteresis, VCC = 10°C hysteresis - no pull-up/down required; direct MCU GPIO control possible. |
| 4 | VCC | Power supply input (+2.5V to +5.5V); requires local 0.1µF ceramic bypass capacitor to suppress supply noise affecting threshold stability. |
| 5 | N.C. | No internal connection - left unconnected; no routing or stubs permitted to avoid parasitic coupling. |
| 6 | OVER | Push-pull active-high output: high = die temperature > +91°C; used for immediate thermal shutdown signaling without external inversion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-programmed thresholds | +55°C (TUNDER) and +91°C (TOVER) - eliminates trimming circuitry and reduces BOM count in volume thermal monitor designs. |
| Push-pull output stage | Drives CMOS/TTL loads directly - removes need for external pull-ups, simplifies layout, and improves noise immunity vs. open-drain alternatives. |
| Pin-selectable hysteresis | 2°C or 10°C via single S0 pin - enables adaptive response to system thermal ramp rates without firmware or hardware changes. |
| ±0.5°C typical threshold accuracy | Validated across full –40°C to +125°C range - ensures reliable trip-point behavior in uncontrolled ambient environments without recalibration. |
| No external components required | Zero external passives for trip-point definition - reduces assembly cost, improves long-term reliability, and accelerates time-to-market. |
Applications
| Microprocessor Thermal Monitoring | Fan Speed Control Interface |
|---|---|
|
Use Scenario: Real-time die temperature tracking of x86 or ARM-based processors in embedded industrial controllers. IC Role / Device Role / Timing Role: Dual-threshold window comparator providing independent OVER (shutdown) and OK (in-spec operation) signals to host controller. Use Value: Enables dynamic fan speed staging: OK signal maintains baseline cooling; OVER triggers immediate 100% fan duty cycle or system reset before thermal throttling occurs. |
Use Scenario: Closed-loop thermal management in network switch chassis with multiple ASICs and power supplies. IC Role / Device Role / Timing Role: Local temperature window detector feeding fan controller PWM input; OVER acts as emergency override signal. Use Value: Eliminates software polling latency - hardware-level response (<100µs) to overtemperature events ensures fan reacts before junction exceeds safe limits. |
| Industrial Motor Drive Protection | Telecom Power Amplifier Monitoring |
|
Use Scenario: IGBT module temperature supervision in servo drive inverters operating at 85°C ambient. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting OVER when heatsink temperature exceeds +91°C, independent of main controller health. Use Value: Provides fail-safe shutdown path even during MCU lockup - critical for functional safety compliance (IEC 61800-5-2). |
Use Scenario: GaN FET bias temperature regulation in 5G mmWave power amplifiers with tight thermal margins. IC Role / Device Role / Timing Role: Window-mode sensor confirming PA operates within optimal efficiency band (+55°C to +91°C); OK enables RF transmission. Use Value: Prevents RF performance degradation by disabling transmit path when temperature drifts outside linear gain region - improves EVM and ACLR. |
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 |
|---|---|---|---|
| MAX6507UT9155+T | Open-drain OVER and OK outputs; identical thresholds and hysteresis selection. | Requires external pull-up resistors; compatible only where bus-sharing or wired-OR logic is needed. | Select when interfacing with shared interrupt lines or legacy 3.3V systems with weak pull-ups. |
| LTC2992IMS#PBF | 12-bit digital temperature sensor with I²C interface, programmable thresholds, and voltage monitoring - not pin-compatible. | Provides continuous temperature readback and multi-channel sensing; higher cost and firmware dependency. | Select when real-time temperature telemetry, logging, or multi-zone monitoring is required beyond simple window detection. |
Compared with MAX6507UT9155+T, the MAX6508UT9155+T eliminates external pull-ups and simplifies board layout; compared with LTC2992IMS#PBF, it delivers deterministic sub-100µs response without MCU involvement - essential for safety-critical thermal cutoffs.
Availability
MAX6508UT9155+T is available at Aetrix Electronics and suitable for microprocessor thermal monitoring, industrial motor drive protection, telecom power amplifier monitoring, and fan speed control interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6508UT9155+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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6505–MAX6508 family was designed specifically for low-cost, high-reliability thermal monitoring in space-constrained systems - delivering factory-calibrated dual-threshold switching without external components or calibration overhead.
FAQ
What is the exact temperature window programmed into MAX6508UT9155+T?
The MAX6508UT9155+T is factory-programmed with TUNDER = +55°C and TOVER = +91°C, establishing a 36°C operational window. This configuration is confirmed by the "9155" suffix per Maxim's Table 4 hex-code mapping: "91" = +91°C (TOVER), "55" = +55°C (TUNDER). The device asserts OK only when temperature is strictly between these two points.
Does MAX6508UT9155+T require external pull-up resistors on its outputs?
No. The MAX6508UT9155+T features push-pull output drivers on both OVER and OK pins, enabling direct connection to CMOS/TTL inputs without external pull-up resistors. This eliminates BOM items, reduces PCB area, and improves noise immunity compared to open-drain variants like MAX6507UT9155+T.
How is hysteresis configured on MAX6508UT9155+T, and what values are supported?
Hysteresis on MAX6508UT9155+T is set exclusively via the S0 pin: grounding S0 selects 2°C hysteresis, while tying S0 to VCC selects 10°C hysteresis. This applies identically to both OVER and OK outputs. S1 is unused (N.C.) in MAX6508 devices and must remain unconnected.
Can MAX6508UT9155+T be used in automotive under-hood applications?
Yes. The MAX6508UT9155+T is rated for operation from –40°C to +125°C and packaged in a qualified SOT23-6 (U6SN+1) with RoHS-compliant finish. Its ±0.5°C typical threshold accuracy and 30µA supply current make it suitable for engine control unit (ECU) thermal monitoring and power module supervision where passive reliability and minimal self-heating are critical.
What is the function of Pin 5 (N.C.) on MAX6508UT9155+T, and how should it be handled?
Pin 5 on MAX6508UT9155+T is designated N.C. (No Connection) - it has no internal connection and must remain unconnected on the PCB. Routing traces to or placing solder pads on this pin may introduce parasitic capacitance or noise coupling; best practice is to omit the pad entirely or leave it floating with no copper attachment.
MAX6508UT9155+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:
- -25°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
MAX6508UT9155+T FAQ
1.How can I place an order for MAX6508UT9155+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6508UT9155+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 MAX6508UT9155+T reliable?
The price and inventory of MAX6508UT9155+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6508UT9155+T is usually 5 days.
3.What payment methods are accepted for MAX6508UT9155+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6508UT9155+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6508UT9155+T?
MAX6508UT9155+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6508UT9155+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 MAX6508UT9155+T?
For technical support, including MAX6508UT9155+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6508UT9155+T requirements.
6.How does Aetrix verify that MAX6508UT9155+T is sourced from the original manufacturer or authorized distributors?
All MAX6508UT9155+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 MAX6508UT9155+T meets industry standards.
7.What is the process for return or replacement of MAX6508UT9155+T?
All MAX6508UT9155+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6508UT9155+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 MAX6508UT9155+T part is unused and in its original packaging.
Return procedure for MAX6508UT9155+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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