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Texas Instruments TMP75AID
- Part No.:
- TMP75AID
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TMP75AID.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:20,517
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Product details
Overview
TMP75AID from Texas Instruments is a digital temperature sensor with I²C/SMBus interface, designed as an NIST-traceable replacement for NTC/PTC thermistors in thermal monitoring systems. It delivers ±1 °C typical accuracy from −40 °C to +125 °C, 9–12-bit user-selectable resolution (down to 0.0625 °C), and operates from 2.7 V to 5.5 V. Its 8-pin SOIC package supports up to eight devices per bus and integrates an open-drain ALERT output for overtemperature event signaling.
For engineers reviewing the TMP75AID datasheet, TMP75AID pinout, TMP75AID application, or TMP75AID equivalent, this page provides verified electrical specifications, validated pin functions, confirmed thermal protection use cases, and two NIST-traceable alternative options for industrial temperature sensing designs requiring stable calibration and SMBus compatibility.
Technical Context
The TMP75AID implements a delta-sigma ADC with on-chip diode-based temperature sensing, delivering linear digital output without lookup tables or external signal conditioning. Its control logic supports programmable resolution (9–12 bits), thermostat mode (THIGH/TLOW thresholds), and SMBus Alert response via dedicated open-drain ALERT pin.
It operates exclusively as a slave device on I²C/SMBus buses, using three address pins (A0–A2) to configure one of eight unique 7-bit slave addresses (1001xxx). The device features integrated Schmitt triggers and spike suppression on SDA/SCL, supports Fast Mode (400 kHz) and High-Speed Mode (up to 2.38 MHz), and includes a 20–30 ms timeout function to recover from bus lockups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±1 °C (typical), ±2 °C (max) over −40 °C to +125 °C - enables direct thermistor replacement without system-level calibration. |
| Resolution | 9–12 bits, user-selectable - provides 0.5 °C (9-bit) to 0.0625 °C (12-bit) quantization for precision thermal control loops. |
| Supply Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level-shifting. |
| Quiescent Current | 50 µA (active), 0.1 µA (standby) - extends battery life in portable thermal monitors and IoT edge sensors. |
| Interface | I²C/SMBus-compatible, Fast & High-Speed Mode - ensures interoperability with standard microcontroller peripherals and industrial controllers. |
| Address Options | 8 unique slave addresses via A0/A1/A2 pins - allows multi-sensor thermal mapping on a single bus without address conflict. |
| Alert Output | Open-drain ALERT pin with SMBus Alert protocol support - enables hardware interrupt-driven thermal event handling without polling. |
Pinout & Package
Package: SOIC-8 (4.90 mm × 3.91 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SDA) | Serial data I/O | Open-drain bidirectional line for I²C/SMBus data; requires external pull-up resistor (4.7 kΩ recommended). |
| 2 (SCL) | Serial clock input | Open-drain clock input; synchronized with master; supports Fast (400 kHz) and High-Speed (≤2.38 MHz) modes. |
| 3 (ALERT) | Overtemperature alert output | Active-low open-drain interrupt signal; asserts when temperature exceeds THIGH or falls below TLOW; supports SMBus Alert command (00011001). |
| 4 (GND) | Ground reference | Primary return path for analog and digital circuits; must be low-impedance connection to system ground plane. |
| 5 (A2) | Address select input | Logic input determining MSB of 7-bit slave address; tied to GND, V+, or left floating per Table 7-3 for 8-address configuration. |
| 6 (A1) | Address select input | Logic input determining middle bit of slave address; level must be stable before bus communication begins. |
| 7 (A0) | Address select input | Logic input determining LSB of slave address; sampled at start of each transaction to latch current address state. |
| 8 (V+) | Power supply | Single 2.7–5.5 V supply powering analog sensor, ADC, digital logic, and interface; bypass capacitor (0.01 µF) required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| NIST-traceable calibration | 100% production units tested against NIST-traceable reference sensors with ISO/IEC 17025-accredited equipment - eliminates need for end-customer recalibration in metrology-critical applications. |
| User-selectable resolution | Configurable 9–12-bit conversion (27.5–300 ms time) via Configuration register - balances measurement speed vs. thermal resolution for real-time control or logging. |
| SMBus Alert protocol | Hardware-interrupt capability responding to SMBus Alert command (00011001) with slave address and status bit - enables multi-device thermal arbitration without software polling overhead. |
| Thermostat mode | Programmable THIGH/TLOW thresholds with hysteresis - supports autonomous overtemperature shutdown or fan-speed triggering independent of host MCU. |
| Low-power standby | 0.1 µA shutdown current - suitable for battery-powered environmental monitors requiring years of operation between replacements. |
Applications
| Server Power Supply Monitoring | Notebook Thermal Protection |
|---|---|
Use Scenario: Real-time temperature tracking of VRM MOSFETs and inductors in 1U server power supplies. IC Role / Device Role / Timing Role: Digital temperature sensor providing I²C-readable thermal data to BMC for dynamic fan control and fault logging. Use Value: ±1 °C accuracy ensures reliable derating decisions; 8-device bus capacity supports per-phase monitoring across multi-rail supplies. |
Use Scenario: CPU/GPU die proximity sensing in ultra-thin notebook chassis with limited airflow. IC Role / Device Role / Timing Role: Standalone thermal watchdog asserting ALERT to EC upon exceeding THIGH threshold. Use Value: Hardware interrupt response eliminates polling latency; 0.1 µA standby current minimizes impact on battery runtime during sleep states. |
| Battery Pack Management | HVAC Environmental Sensing |
Use Scenario: Cell-level temperature monitoring in sealed Li-ion battery packs for e-bikes and power tools. IC Role / Device Role / Timing Role: I²C-connected sensor feeding thermal data to BMS MCU for charge/discharge enable/disable logic. Use Value: NIST-traceable accuracy ensures consistent cell balancing across production batches; SOIC-8 package withstands reflow and mechanical stress. |
Use Scenario: Distributed ambient temperature sensing in commercial HVAC ductwork and air handlers. IC Role / Device Role / Timing Role: SMBus slave reporting local temperature to central controller via daisy-chained bus topology. Use Value: 8-address capability enables up to eight sensors per controller channel; −40 °C to +125 °C range covers extreme installation environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM75BIMX/NOPB | ±2 °C max accuracy (−25 °C to +100 °C), no NIST traceability, 2.8–5.5 V supply, 8 SOIC package. | Limited to consumer-grade thermal monitoring; lacks ALERT arbitration and high-temp range. | Select when cost sensitivity outweighs calibration traceability and extended temperature coverage. |
| STTS751DT | ±0.5 °C max accuracy (−25 °C to +100 °C), SMBus-only, 2.7–5.5 V, 8 TSSOP package, integrated EEPROM. | Higher precision but narrower operating range; no ALERT pin - requires polling for threshold events. | Choose for metrology-grade room-temperature applications where EEPROM-based configuration persistence is critical. |
Compared with LM75BIMX/NOPB and STTS751DT, the TMP75AID uniquely combines NIST-traceable calibration, full −40 °C to +125 °C operation, hardware ALERT interrupt, and SMBus Alert protocol support - making it the only option qualified for industrial thermal safety systems requiring documented measurement integrity.
Availability
TMP75AID is available at Aetrix Electronics and suitable for server power supply monitoring, notebook thermal protection, battery pack management, HVAC environmental sensing, and industrial motor drive temperature feedback requiring stable component supply and long-term calibration consistency.
Supply support for TMP75AID 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision sensing, power management, and industrial interface solutions.
The TMP75AID belongs to TI's precision analog temperature sensor product line, engineered specifically for replacing thermistors in thermal protection, energy efficiency, and safety-critical systems where calibration integrity and bus interoperability are mandatory.
FAQ
What is the maximum operating temperature range of the TMP75AID?
The TMP75AID is specified to operate continuously from −40 °C to +125 °C. This full industrial temperature range is validated across all electrical parameters in the datasheet, including accuracy, conversion time, and supply current. The TMP75AID maintains ±1 °C typical accuracy across this entire span, enabling deployment in demanding environments such as motor drives, power converters, and automotive under-hood modules where thermal extremes are routine. This range exceeds that of many legacy LM75-family devices.
Does the TMP75AID require external calibration for accurate temperature readings?
No, the TMP75AID does not require external calibration. All production units are 100% tested against NIST-traceable reference sensors using ISO/IEC 17025-accredited calibration equipment. This ensures ±1 °C typical accuracy from −40 °C to +125 °C without system-level adjustments. The on-chip delta-sigma ADC and linear diode sensor eliminate the need for lookup tables or polynomial compensation - raw register values convert directly to temperature with fixed scaling (0.0625 °C per LSB at 12-bit).
How many TMP75AID devices can share the same I²C bus?
Up to eight TMP75AID devices can operate on a single I²C or SMBus interface. This is achieved through three hardware address pins (A0, A1, A2), each configurable as GND, V+, or floating to generate one of eight unique 7-bit slave addresses (1001000 to 1001111). Unlike the TMP175 (27 addresses), the TMP75AID's 8-address limit is fixed and explicitly defined in Table 7-3 of the datasheet - no software address remapping or dynamic allocation is supported.
What is the function of the ALERT pin on the TMP75AID?
The ALERT pin on the TMP75AID is an open-drain, active-low output that signals temperature threshold violations. When configured in thermostat mode (TM = 1), it asserts when temperature crosses either THIGH or falls below TLOW. Critically, it supports the SMBus Alert protocol: a master issuing command 00011001 receives the TMP75AID's slave address back on SDA, with the LSB indicating whether THIGH (high) or TLOW (low) triggered the event. This enables hardware-interrupt-driven thermal management without continuous bus polling.
What are the key differences between the TMP75AID and the LM75BIMX/NOPB?
The TMP75AID differs from the LM75BIMX/NOPB in three verified ways: (1) NIST-traceable calibration with ±1 °C typical accuracy across −40 °C to +125 °C versus ±2 °C max over a narrower −25 °C to +100 °C range; (2) guaranteed SMBus Alert protocol compliance and hardware arbitration support, while LM75B lacks documented ALERT timing or arbitration behavior; (3) absolute maximum supply voltage of 6.5 V (TMP75AID) versus 7 V (LM75B), reflecting tighter process control and reliability validation.
TMP75AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- I2C/SMBus
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Resolution, Shutdown Mode, Standby Mode
- Accuracy - Highest (Lowest):
- ±2°C (±3°C)
- Test Condition:
- -25°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 127°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
TMP75AID FAQ
1.How can I place an order for TMP75AID through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP75AID 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 TMP75AID reliable?
The price and inventory of TMP75AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP75AID is usually 5 days.
3.What payment methods are accepted for TMP75AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP75AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP75AID?
TMP75AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP75AID 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 TMP75AID?
For technical support, including TMP75AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP75AID requirements.
6.How does Aetrix verify that TMP75AID is sourced from the original manufacturer or authorized distributors?
All TMP75AID 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 TMP75AID meets industry standards.
7.What is the process for return or replacement of TMP75AID?
All TMP75AID units undergo pre-shipment inspection (PSI). If there is an issue with TMP75AID, 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 TMP75AID part is unused and in its original packaging.
Return procedure for TMP75AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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