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Texas Instruments TMP124AIDG4
- Part No.:
- TMP124AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog and Digital Output
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TMP124AIDG4.pdf
- Description:
- SENSOR DIGITAL -40C-125C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
TMP124AIDG4 from Texas Instruments is a SPI-compatible digital temperature sensor in SO-8 package, delivering ±2.0°C accuracy from –40°C to +125°C with programmable 9- to 12-bit resolution, 50µA quiescent current, and operation up to +150°C - used for thermal protection in power supplies and notebook computers.
For engineers reviewing the TMP124AIDG4 datasheet, TMP124AIDG4 pinout, TMP124AIDG4 application, or TMP124AIDG4 equivalent, key selection criteria include SPI interface timing compliance, ALERT pin polarity configuration, programmable fault queue depth, and thermal accuracy across extended industrial temperature range.
Technical Context
The TMP124AIDG4 integrates a precision silicon diode temperature sensor, delta-sigma A/D converter, oscillator, and SPI serial interface logic. Its internal register architecture supports independent read/write access to Temperature, Configuration, TLOW, and THIGH registers via 16-bit command framing.
It implements three thermostat modes (Comparator, Interrupt, Interrupt/Comparator) controlled by TM1/TM0 bits, with ALERT output polarity configurable via POL bit and fault detection requiring consecutive over-limit readings defined by F1/F0 bits - all managed through the Configuration Register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±2.0°C max over –40°C to +125°C - ensures reliable thermal trip point enforcement in industrial environments |
| Resolution | Programmable 9–12 bits + sign - enables trade-off between measurement granularity (0.0625°C at 12-bit) and conversion time (240 ms) |
| Supply Range | 2.7V to 5.5V - compatible with single-supply 3.3V and 5V systems without level-shifting |
| Quiescent Current | 50 µA typical - supports battery-powered or low-power always-on monitoring applications |
| Shutdown Current | 0.1 µA to 1 µA - reduces system standby power when temperature polling is infrequent |
| Operating Temp | –55°C to +150°C - validated for under-hood automotive or high-temp industrial enclosures |
| SPI Timing | t1 ≥ 100 ns SCK period - meets standard SPI master timing margins without custom clock tuning |
Pinout & Package
SO-8 surface-mount package (JEDEC MS-012, variation AA), 3.9 mm × 4.9 mm body, 1.75 mm max height, 1.27 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SI/O) | Serial Data I/O | Open-drain bidirectional SPI data line - requires external pull-up; transmits temperature data and receives commands |
| 2 (SCK) | Serial Clock Input | Master-generated clock synchronizing all SPI transfers; minimum 100 ns period supported |
| 3 (NC) | No Connection | Internally unconnected; must be left floating or tied to GND per layout guidelines |
| 4 (GND) | Ground Reference | Analog/digital common return; requires low-inductance connection to minimize noise coupling into sensor core |
| 5 (V+) | Power Supply | 2.7V–5.5V analog/digital supply; decoupling with 0.1 µF ceramic capacitor mandatory at pin |
| 6 (CS) | Chip Select Input | Active-low SPI enable; falling edge initiates communication sequence and resets internal read address pointer |
| 7 (NC) | No Connection | Internally unconnected; must be left floating or tied to GND per layout guidelines |
| 8 (ALERT) | Interrupt Output | Open-drain active-Low (default) or active-High (configurable) alert signal - asserts on temperature threshold violation |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Resolution | 9–12-bit + sign selection via Configuration Register R1/R0 bits - balances precision (0.0625°C) against conversion latency (240 ms) |
| Configurable ALERT Polarity | POL bit toggles ALERT output between active-Low and active-High - simplifies integration with host MCU GPIO interrupt logic |
| Three Thermostat Modes | Comparator, Interrupt, and Interrupt/Comparator modes selectable via TM1/TM0 - supports both latching and auto-clearing thermal alerts |
| Consecutive Fault Queue | F1/F0 bits set fault count (1, 2, 4, or 6) before ALERT assertion - prevents false triggers from transient thermal noise |
| Shutdown Command Support | 16-bit WRITE with last 8 bits = 1 places device in sub-1 µA shutdown - enables ultra-low-power periodic wake-up sensing |
Applications
| Power-Supply Thermal Monitoring | Notebook Computer Thermal Protection |
|---|---|
Use Scenario: Real-time temperature tracking of DC-DC converter MOSFETs and inductors during load transients. IC Role / Device Role / Timing Role: Digital temperature sensor providing SPI-readable 12-bit measurements every 240 ms at full resolution. Use Value: Enables dynamic throttling before thermal derating occurs, preserving power delivery stability within ±2.0°C accuracy. | Use Scenario: CPU/GPU die proximity sensing to trigger fan speed ramp or system sleep on thermal violation. IC Role / Device Role / Timing Role: ALERT-driven interrupt source with programmable THIGH/TLOW thresholds and fault queue filtering. Use Value: Reduces false alarms from ambient airflow fluctuations while maintaining fast response to actual hotspots. |
| Battery Management Systems | Office Equipment Thermal Control |
Use Scenario: Li-ion pack temperature supervision during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: Low-quiescent-current (50 µA) sensor operating from battery rail, entering shutdown (<1 µA) between reads. Use Value: Extends battery life by minimizing background current draw while retaining precise thermal safety margin. | Use Scenario: Laser printer fuser assembly temperature regulation to prevent paper jams or toner offset. IC Role / Device Role / Timing Role: Comparator-mode ALERT output directly driving solid-state relay control logic. Use Value: Eliminates need for external comparator IC and reference, reducing BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital temperature sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31820 | 1-Wire interface, ±0.5°C accuracy (–10°C to +85°C), 1.8V–5.5V supply, TO-92 package | Single-wire bus reduces pin count but lacks SPI register-level control; lower accuracy spec outside narrow range | Select for cost-sensitive, low-pin-count designs where SPI is unavailable and ±0.5°C accuracy suffices |
| LMT70AIDSC | Analog output (ratiometric voltage), ±0.1°C accuracy (20°C–42°C), 1.4V–3.6V supply, SC70-6 package | Requires external ADC; superior accuracy in narrow band but no digital alert or programmable thresholds | Select when highest local accuracy needed and host has spare ADC channel; not suitable for standalone alerting |
Compared with MAX31820 and LMT70AIDSC, TMP124AIDG4 provides SPI-configurable alert behavior, wider operating temperature range (–55°C to +150°C), and guaranteed ±2.0°C accuracy across full industrial range - making it optimal for embedded thermal management requiring deterministic digital interface and robustness.
Availability
TMP124AIDG4 is available at Aetrix Electronics and suitable for power-supply thermal monitoring, notebook computer thermal protection, and battery management systems requiring stable component supply and long-term industrial-grade availability.
Supply support for TMP124AIDG4 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 headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and connectivity products for industrial, automotive, and consumer markets.
The TMP124AIDG4 belongs to TI's precision analog temperature sensor product line, engineered specifically for SPI-based thermal monitoring in space-constrained, low-power industrial and computing systems.
FAQ
What is the absolute maximum supply voltage for TMP124AIDG4?
The absolute maximum supply voltage for TMP124AIDG4 is 7 V. Exceeding this rating may cause permanent damage. The recommended operating range remains 2.7 V to 5.5 V per specifications. Operation at 7 V is not functional - it is a stress limit only. Always use appropriate decoupling and ensure V+ stays within the specified operating window during normal use of TMP124AIDG4.
Does TMP124AIDG4 support true 12-bit resolution with 0.0625°C step size?
Yes, TMP124AIDG4 supports true 12-bit + sign resolution yielding 0.0625°C per LSB, confirmed in Electrical Characteristics table and Table XI. This resolution is achieved when R1/R0 bits in the Configuration Register are set to 1/1. Conversion time at this setting is 240 ms typical. The TMP124AIDG4 maintains this resolution across its full –40°C to +125°C specified range.
How does the ALERT pin behave in Comparator Mode with default settings?
In default Comparator Mode (TM1/TM0 = 0/0), the ALERT pin of TMP124AIDG4 goes active-Low when temperature reaches or exceeds THIGH (power-up default: 80°C), remains asserted until temperature falls below TLOW (default: 75°C), and requires consecutive faults per F1/F0 setting. With default F1/F0 = 0/0, one fault triggers ALERT. POL = 0 sets active-Low output, matching standard microcontroller interrupt inputs.
Can TMP124AIDG4 be used beyond its specified –40°C to +125°C range?
Yes, TMP124AIDG4 is rated for operation from –55°C to +150°C per Absolute Maximum Ratings, though accuracy degrades to ±1.5°C over –55°C to +150°C. The device remains functional and electrically stable in this extended range, but full ±2.0°C accuracy is only guaranteed from –40°C to +125°C. Applications requiring certified accuracy must stay within the specified range for TMP124AIDG4.
What is the purpose of the NC pins on TMP124AIDG4?
The two NC (No Connection) pins on TMP124AIDG4 - Pin 3 and Pin 7 - are internally unconnected and serve mechanical or package compatibility purposes. They must be left floating or tied to GND per TI's layout recommendations; routing signals to them will not affect functionality but may compromise thermal or electrical performance. Their presence maintains SO-8 footprint compatibility across TI's sensor family.
TMP124AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Sensor Type:
- Digital, Local
- Sensing Temperature - Local:
- -40°C ~ 125°C
- Sensing Temperature - Remote:
- -
- Output Type:
- SPI
- Voltage - Supply:
- 2.7V ~ 5.5V
- Resolution:
- 12 b
- Features:
- Output Switch, Programmable Resolution, Shutdown Mode
- Accuracy - Highest (Lowest):
- ±1.5°C (±2°C)
- Test Condition:
- -25°C ~ 85°C (-40°C ~ 125°C)
- Operating Temperature:
- -55°C ~ 150°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
TMP124AIDG4 FAQ
1.How can I place an order for TMP124AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TMP124AIDG4 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 TMP124AIDG4 reliable?
The price and inventory of TMP124AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMP124AIDG4 is usually 5 days.
3.What payment methods are accepted for TMP124AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMP124AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMP124AIDG4?
TMP124AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMP124AIDG4 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 TMP124AIDG4?
For technical support, including TMP124AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMP124AIDG4 requirements.
6.How does Aetrix verify that TMP124AIDG4 is sourced from the original manufacturer or authorized distributors?
All TMP124AIDG4 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 TMP124AIDG4 meets industry standards.
7.What is the process for return or replacement of TMP124AIDG4?
All TMP124AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with TMP124AIDG4, 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 TMP124AIDG4 part is unused and in its original packaging.
Return procedure for TMP124AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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