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Texas Instruments TMP75CIDR
- Part No.:
- TMP75CIDR
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TMP75CIDR.pdf
- Description:
- SENSOR DIGITAL -55C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,996
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Product details
Overview
TMP75CIDR from Texas Instruments is a 12-bit digital temperature sensor with two-wire (I²C/SMBus) interface, ±0.25°C accuracy from 0°C to +70°C, 0.0625°C resolution, and 1.4 V to 3.6 V supply range. It operates as a local PCB temperature monitor in thermal management systems for servers, telecom equipment, and power supplies.
For engineers reviewing the TMP75CIDR datasheet, TMP75CIDR pinout, TMP75CIDR application, or TMP75CIDR equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative options, and supply support for industrial thermal sensing deployments.
Technical Context
The TMP75CIDR integrates a band-gap BJT temperature-sensing element with a 12-bit ADC and on-chip voltage regulator, delivering digitized Celsius values directly via SMBus-compatible two-wire interface. Its ALERT pin supports programmable comparator or interrupt modes with hysteresis via TLOW/THIGH registers.
It supports up to eight devices on one bus using three hardware address pins (A0–A2), operates in continuous or one-shot conversion mode, and features shutdown current as low as 0.3 μA (typ) for battery-powered applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.4 V to 3.6 V - enables direct integration into 1.8-V and 3.3-V logic domains without level-shifting. |
| Temperature Range | –55°C to +125°C - supports operation in harsh environments including motor drivers and industrial power supplies. |
| Accuracy | ±0.25°C (0°C to +70°C) - sufficient for closed-loop thermal compensation of voltage references and precision analog circuits. |
| Resolution | 0.0625°C (12-bit) - allows detection of sub-degree changes critical for fan speed control and thermal throttling algorithms. |
| Conversion Time | 27 ms (typ) - determines minimum response latency for overtemperature alerts in safety-critical shutdown sequences. |
| Quiescent Current | 15 μA (typ, inactive) - extends battery life in portable environmental monitors and wireless sensor nodes. |
| Alert Output | Open-drain, programmable trip points - eliminates need for external comparators when implementing thermostat or fault-triggered system actions. |
Pinout & Package
Package: SOIC-8 (4.90 mm × 3.90 mm), RoHS-compliant, tape-and-reel packaging per TMP75CIDR orderable variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS | Power supply input | Accepts 1.4–3.6 V; powers internal regulator, ADC, and interface logic - must be decoupled with 0.1 μF ceramic capacitor near pin. |
| GND | Ground reference | Primary thermal and electrical return path; PCB copper pour under package improves thermal coupling to board temperature. |
| SDA | Two-wire serial data I/O | Open-drain bidirectional line requiring external pull-up; supports fast-mode (400 kHz) and high-speed mode (up to 3 MHz). |
| SCL | Two-wire serial clock input | Master-generated clock; integrated Schmitt trigger and spike suppression ensure noise immunity in electrically noisy environments. |
| A0, A1, A2 | Address select inputs | Hardwired to GND or VS to configure one of eight unique slave addresses (1001000–1001111 binary) on shared bus. |
| ALERT | Overtemperature alert output | Open-drain output; active-low by default; asserts when temperature ≥ THIGH and clears only after falling below TLOW (comparator mode). |
Key Features
| Feature | Design Value |
|---|---|
| Pin/register compatibility with NCT75/ADT75 | Enables drop-in replacement in legacy designs without firmware or layout changes. |
| Programmable ALERT trip thresholds | Allows implementation of custom thermal shutdown profiles without external components or host CPU polling. |
| One-shot conversion mode | Reduces average current consumption in intermittent monitoring applications such as HVAC sensor nodes. |
| Shutdown mode (0.3 μA) | Permits ultra-low-power sleep states in battery-backed systems while retaining register configuration. |
| Factory-calibrated accuracy | Eliminates need for system-level calibration during production test or field deployment. |
Applications
| Server Thermal Management | Telecom Equipment Monitoring |
|---|---|
Use Scenario: Real-time CPU/die temperature tracking and fan speed control in rack-mounted servers. IC Role / Device Role / Timing Role: Local temperature sensor feeding closed-loop thermal management firmware via I²C. Use Value: ±0.25°C accuracy ensures precise throttling decisions within safe operating margins, preventing premature performance derating. | Use Scenario: Monitoring power amplifier junction temperature in 5G base station RF modules. IC Role / Device Role / Timing Role: Standalone overtemperature alarm triggering automatic RF power reduction before thermal shutdown. Use Value: Programmable ALERT with hysteresis avoids oscillation during transient thermal events, improving system reliability. |
| Industrial Power Supply Protection | Motor Driver Thermal Sensing |
Use Scenario: Detecting heatsink overheating in AC/DC converters used in factory automation PLCs. IC Role / Device Role / Timing Role: Direct-mount sensor on primary-side heatsink providing analog-equivalent feedback to protection circuitry. Use Value: 125°C max operating range and –55°C min rating cover full industrial ambient and self-heating envelope. | Use Scenario: Measuring IGBT module case temperature in servo drive inverters. IC Role / Device Role / Timing Role: Local thermal monitor interfacing with microcontroller over shared I²C bus alongside current/voltage sensors. Use Value: Eight-device addressing enables distributed thermal sensing across multi-phase motor drives without bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCT75MUA | Same pinout, identical register map, but rated only to +125°C (not –55°C); 3.3-V only supply (no 1.8-V operation). | Limited to commercial-temperature applications; unsuitable for cold-environment industrial use. | Select TMP75CIDR when extended temperature range or dual-voltage support is required. |
| ADT75BRMZ | Pin-compatible, same 12-bit resolution and I²C interface, but higher quiescent current (250 μA vs 15 μA) and no shutdown mode. | Not viable for battery-powered or energy-harvesting nodes due to power budget constraints. | Choose TMP75CIDR for ultra-low-power thermal monitoring where <20 μA active current is mandatory. |
Compared with NCT75MUA and ADT75BRMZ, the TMP75CIDR uniquely combines extended –55°C to +125°C operation, 1.4–3.6 V supply flexibility, and sub-1 μA shutdown current - making it the only option qualified for wide-temperature, low-voltage, and battery-constrained thermal sensing.
Availability
TMP75CIDR is available at Aetrix Electronics and suitable for server thermal management, telecom equipment monitoring, and industrial power supply protection requiring stable component supply across long-lifecycle programs.
Supply support for TMP75CIDR 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 interface solutions.
The TMP75C product line was designed for high-accuracy, low-power, and pin-compatible digital temperature sensing in thermally constrained systems - targeting server, telecom, industrial, and automotive thermal protection applications.
FAQ
What is the operating temperature range of the TMP75CIDR?
The TMP75CIDR operates from –55°C to +125°C. This full industrial range is specified and tested per JEDEC standards, enabling reliable use in extreme environments such as outdoor telecom enclosures, motor drive heatsinks, and automotive under-hood modules. The TMP75CIDR maintains ±1°C accuracy across this entire span, with tighter ±0.25°C tolerance in the 0°C to +70°C zone commonly used for computing thermal management.
Does the TMP75CIDR support both 1.8-V and 3.3-V I²C buses?
Yes, the TMP75CIDR supports I²C communication across its full 1.4 V to 3.6 V supply range, including standard 1.8-V and 3.3-V logic levels. Its SDA and SCL inputs feature Schmitt triggers and spike suppression, ensuring robust operation even with mixed-voltage bus configurations. The TMP75CIDR does not require external level shifters when interfacing with controllers operating at either voltage.
How many TMP75CIDR devices can share the same I²C bus?
Up to eight TMP75CIDR devices can operate on a single I²C bus using hardware address pins A0, A1, and A2. Each combination of GND/VS connections sets a unique 7-bit slave address (1001000 to 1001111 binary). This capability enables distributed temperature monitoring across multiple PCB zones - for example, CPU, GPU, VRM, and memory modules - without bus arbitration overhead.
What is the function of the ALERT pin on the TMP75CIDR?
The ALERT pin on the TMP75CIDR is an open-drain output that signals overtemperature conditions based on user-programmed THIGH and TLOW register values. It operates in comparator mode (default) or interrupt mode, with polarity selectable via the POL bit. In comparator mode, ALERT asserts when temperature reaches THIGH and clears only after falling below TLOW - providing built-in hysteresis to prevent chatter during thermal transients.
Is the TMP75CIDR pin-compatible with the NCT75 and ADT75?
Yes, the TMP75CIDR is fully pin- and register-compatible with the NCT75 and ADT75. It uses identical SOIC-8 pinout, matching address pin locations (A0–A2), identical ALERT/SDA/SCL/GND/VS assignments, and identical register map structure. Firmware written for those predecessors requires zero modification to operate with the TMP75CIDR, making it a direct drop-in upgrade for improved voltage range and lower power consumption.
TMP75CIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -55°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SMBus
- Voltage - Supply:
- 1.4V ~ 3.6V
- Resolution:
- 11 b
- Features:
- One-Shot, Output Switch, Programmable Limit, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1°C (±3°C)
- Test Condition:
- 0°C ~ 70°C (-55°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 125°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
TMP75CIDR FAQ
1.How can I place an order for TMP75CIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP75CIDR 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 TMP75CIDR reliable?
The price and inventory of TMP75CIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP75CIDR is usually 5 days.
3.What payment methods are accepted for TMP75CIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP75CIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP75CIDR?
TMP75CIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP75CIDR 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 TMP75CIDR?
For technical support, including TMP75CIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP75CIDR requirements.
6.How does Aetrix verify that TMP75CIDR is sourced from the original manufacturer or authorized distributors?
All TMP75CIDR 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 TMP75CIDR meets industry standards.
7.What is the process for return or replacement of TMP75CIDR?
All TMP75CIDR units undergo pre-shipment inspection (PSI). If there is an issue with TMP75CIDR, 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 TMP75CIDR part is unused and in its original packaging.
Return procedure for TMP75CIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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