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Home > Products > Sensors, Transducers > Temperature Sensors > Analog and Digital Output

STMicroelectronics STLM75M2E

Name: STLM75M2E
Brand: STMicroelectronics
SKU: STLM75M2E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STLM75M2E

Manufacturer:: STMicroelectronics

Category:: Analog and Digital Output

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STLM75M2E.pdf

Description:: SENSOR DIGITAL -55C-125C 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:4,497

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Product details

Overview

STLM75M2E from STMicroelectronics is a digital temperature sensor IC with integrated sigma-delta ADC and I²C/SMBus interface, functioning as a thermal watchdog in system-level thermal management. It delivers ±0.5°C typical accuracy from –55°C to +125°C, operates from 2.7 V to 5.5 V, draws 125 µA typical supply current, and features an open-drain OS/INT pin configurable as comparator or interrupt output - deployed in PC motherboard thermal monitoring, power supply modules, and industrial controller thermal protection.

For engineers reviewing the STLM75M2E datasheet, STLM75M2E pinout, STLM75M2E application, or STLM75M2E equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (comparator/interrupt), real-world thermal alarm use cases, and documented alternatives for drop-in or functional replacement scenarios.

Technical Context

The STLM75M2E implements a bandgap-based temperature sensing element paired with a 9-bit sigma-delta ADC, delivering 16-bit two's complement temperature data with resolution of 0.5°C per LSB. Its digital core includes programmable TOS (overlimit) and THYS (hysteresis) registers, fault-tolerance logic (FT0/FT1 bits), and polarity control (POL bit) for OS/INT output.

It supports full I²C bus timing up to 400 kHz, uses A0–A2 address pins to configure one of eight slave addresses (1001000 to 1001111), and integrates bus timeout detection. Power-up defaults enable immediate thermostat operation without host initialization - critical for fail-safe thermal shutdown in embedded systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Temperature Range	–55°C to +125°C; full-range operation enables use in automotive under-hood and industrial ambient environments.
Accuracy	±0.5°C (typ) at 25°C; ±2°C (max) from –25°C to +100°C - sufficient for fan speed control and overtemperature warning thresholds.
Supply Voltage	2.7 V to 5.5 V; compatible with both 3.3 V and 5 V logic domains without level-shifting.
Quiescent Current	125 µA (typ); enables always-on thermal monitoring in battery-backed or low-power systems.
Conversion Time	150 ms (max); allows rapid response to thermal transients while maintaining low average power.
Interface	I²C/SMBus-compatible, 400 kHz max clock; supports multi-drop bus with 8-device addressing via A0–A2 pins.
Output Pin	OS/INT open-drain; dual-mode (comparator or interrupt) with user-programmable hysteresis and fault tolerance queue.

Pinout & Package

STLM75M2E is available in MSOP8 (TSSOP8) package - 8-lead, 3 mm × 3 mm, 0.65 mm pitch, thin shrink outline - optimized for space-constrained PCB layouts in power supplies and embedded controllers.

Pin/Terminal	Circuit Role	Design Meaning
1: SDA	Open-drain bidirectional serial data	Requires external pull-up; handles I²C read/write transactions and register access without direction control.
2: SCL	Input serial clock	Master-generated clock synchronizes all data transfers; supports standard/fast-mode I²C timing.
3: OS/INT	Open-drain overlimit/interrupt output	Asserts on thermal threshold breach; polarity and mode (comparator/interrupt) configured via register bits.
4: GND	Power ground reference	Must be connected directly to system ground plane to ensure stable ADC reference and noise immunity.
5: A2	Address input (LSB)	Configures I²C slave address bit A2; tied high/low to select one of eight unique bus addresses.
6: A1	Address input (middle bit)	Configures I²C slave address bit A1; used with A0/A2 for multi-device bus topology.
7: A0	Address input (MSB)	Configures I²C slave address bit A0; enables up to eight STLM75M2E devices on same I²C bus.
8: VDD	Supply voltage input	Accepts 2.7–5.5 V; requires local 0.1 µF ceramic bypass capacitor for ADC stability and noise rejection.

Key Features

Feature	Design Value
Pin- and software-compatible with LM75B	Drop-in replacement in existing LM75B designs - no layout or firmware changes required.
Programmable thermal thresholds	TOS and THYS registers allow runtime adjustment of trip and hysteresis points via I²C, enabling adaptive thermal policies.
Fault-tolerant alarm logic	FT0/FT1 bits configure 1–4 consecutive overtemp readings before OS/INT assertion - suppresses false alarms in noisy environments.
Standalone thermostat operation	Power-up defaults enable immediate comparator-mode operation without host MCU intervention - critical for safety-critical thermal shutdown.
Shutdown mode	Reduces current to <1 µA; preserves register state and allows fast wake-up for periodic thermal sampling.

Applications

Server CPU Thermal Monitoring

Industrial PLC Temperature Guarding

Use Scenario: Real-time die temperature tracking on x86 server CPUs to trigger dynamic frequency scaling or fan ramp-up.

IC Role / Device Role / Timing Role: Digital temperature sensor providing calibrated 16-bit readings every 150 ms to BMC or host controller via I²C.

Use Value: ±2°C accuracy in –25°C to +100°C range ensures reliable throttling decisions before thermal damage occurs.

Use Scenario: Monitoring enclosure ambient temperature in programmable logic controllers to prevent processor lockup during extended operation.

IC Role / Device Role / Timing Role: Standalone thermal watchdog using OS/INT in comparator mode to assert hardware reset if ambient exceeds 85°C.

Use Value: Fault-tolerant logic (4-sample queue) prevents nuisance resets due to transient EMI or sensor noise.

AC-DC Power Supply Overtemp Protection

Battery Pack Safety Management

Use Scenario: Detecting MOSFET or transformer overheating in 500 W telecom power supplies to initiate graceful shutdown.

IC Role / Device Role / Timing Role: Primary thermal sensor feeding interrupt-driven shutdown logic via OS/INT pin, independent of main controller.

Use Value: Open-drain OS/INT output directly drives latch circuitry - eliminates need for additional GPIO or polling overhead.

Use Scenario: Monitoring cell stack temperature in Li-ion battery packs to enforce charge/discharge cutoffs per JEITA guidelines.

IC Role / Device Role / Timing Role: High-accuracy sensor interfaced to battery management IC via shared I²C bus; reads temperature every 500 ms.

Use Value: ±0.5°C typical accuracy at 25°C enables precise compliance with ±3°C thermal limits for safe charging protocols.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor and thermal watchdog applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM75BIMM/NOPB	Same pinout and register map; ±2°C max accuracy over –25°C to +100°C, but no bus timeout feature.	Lacks STLM75M2E's bus timeout detection - less robust in electrically noisy industrial I²C buses.	Select when legacy LM75B compatibility is mandatory and bus reliability is ensured by system-level design.
MAX31820	1-Wire interface (not I²C); ±0.5°C accuracy; integrated 12-bit ADC; requires parasitic power option or VDD connection.	Single-wire topology reduces PCB routing complexity but increases firmware dependency for timing-critical 1-Wire protocol.	Prefer for space-constrained designs where I²C bus loading must be minimized and microcontroller supports 1-Wire stack.

Compared with LM75BIMM/NOPB, STLM75M2E adds bus timeout protection and tighter accuracy spec; versus MAX31820, it offers simpler I²C integration and deterministic timing - making it optimal for industrial control and power supply thermal guardbanding where bus robustness and ease of validation matter.

Availability

STLM75M2E is available at Aetrix Electronics and suitable for server thermal management, industrial PLC guarding, and AC-DC power supply overtemperature protection requiring stable component supply across multi-year production cycles.

Supply support for STLM75M2E 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, mixed-signal, and power ICs for industrial, automotive, and consumer markets.

The STLM75 belongs to ST's precision analog sensor product line, engineered specifically for embedded thermal monitoring and fail-safe thermal watchdog applications in resource-constrained systems.

FAQ

What is the default OS/INT pin behavior at power-up?

At power-up, the OS/INT pin defaults to active-low comparator mode with TOS = +80°C and THYS = +75°C, enabling immediate standalone thermostat operation without I²C initialization. The fault tolerance is set to 1, and polarity is fixed low unless modified via the configuration register's POL bit.

Can STLM75M2E operate without external pull-up resistors?

No - SDA, SCL, and OS/INT are all open-drain outputs and require external pull-up resistors (typically 4.7 kΩ to VDD) to establish valid logic-high levels. Omitting them results in undefined bus states and non-functional communication or alarm signaling.

How does fault tolerance prevent false alarms?

Fault tolerance (configured via FT0/FT1 bits) requires 1–4 consecutive temperature readings above TOS before asserting OS/INT. This counters transient spikes caused by EMI or measurement noise - especially valuable in motor drives or switching power supplies with high dv/dt interference.

Is STLM75M2E RoHS-compliant and halogen-free?

Yes - STLM75M2E is manufactured in accordance with EU RoHS Directive 2011/65/EU and is halogen-free per STMicroelectronics' specification document AN4457, with lead-free MSOP8 package and matte tin terminal finish.

STLM75M2E Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tube

Product Status:: Obsolete

Sensor Type:: Digital, Local

Sensing Temperature - Local:: -55°C ~ 125°C

Sensing Temperature - Remote:: -

Output Type:: I2C/SMBus

Voltage - Supply:: 2.7V ~ 5.5V

Resolution:: 9 b

Features:: Output Switch, Programmable Limit, Shutdown Mode, Standby Mode

Accuracy - Highest (Lowest):: ±2°C (±3°C)

Test Condition:: -25°C ~ 100°C (-55°C ~ 125°C)

Operating Temperature:: -55°C ~ 125°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 8-SOIC

STLM75M2E FAQ

1.How can I place an order for STLM75M2E through Aetrix?

Please submit a Request for Quotation (RFQ) for STLM75M2E 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 STLM75M2E reliable?

The price and inventory of STLM75M2E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLM75M2E is usually 5 days.

3.What payment methods are accepted for STLM75M2E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLM75M2E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STLM75M2E?

STLM75M2E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STLM75M2E 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 STLM75M2E?

For technical support, including STLM75M2E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLM75M2E requirements.

6.How does Aetrix verify that STLM75M2E is sourced from the original manufacturer or authorized distributors?

All STLM75M2E 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 STLM75M2E meets industry standards.

7.What is the process for return or replacement of STLM75M2E?

All STLM75M2E units undergo pre-shipment inspection (PSI). If there is an issue with STLM75M2E, 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 STLM75M2E part is unused and in its original packaging.

Return procedure for STLM75M2E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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