Specifications
| Type | Description |
|---|---|
| Part Number | TMP125 |
| Manufacturer | Texas Instruments |
| Product Type | Digital temperature sensor |
| Category | Sensor |
| Package / Case | SOT23-6 (DBV), dimensions not provided |
| Sensor Interface | SPI-compatible digital output |
| Temperature Resolution | 10-bit, 0.25 °C |
| Temperature Measurement Range | -40 to +125 °C |
| Temperature Accuracy (-25 °C to +85 °C) | ±0.5 °C typ, ±2.0 °C max |
| Temperature Accuracy (-40 °C to +125 °C) | ±1.0 °C typ, ±2.5 °C max |
| Temperature Measurement Noise | 0.1 LSB |
| Temperature Measurement Noise Condition | TA=-40 °C to +125 °C, VS=2.7 V to 5.5 V |
| Input Logic High Voltage | 0.7 x V+ min |
| Input Logic Low Voltage | 0.3 x V+ max |
| Input Current | ±1 µA max |
| Input Current Condition | SI, SCK, CS; 0 V <= VIN <= V+ |
| Output Low Voltage | 0.4 V max |
| Output Low Voltage Condition | SO, ISINK=3 mA |
| Output High Voltage | V+ - 0.4 V min |
| Output High Voltage Condition | SO, ISOURCE=2 mA |
| Input Capacitance | 2.5 pF typ |
| Input Capacitance Condition | SI, SCK, CS |
| Conversion Time | 60 ms max |
| Conversion Time Condition | 10-bit conversion |
| Update Rate | 120 ms max |
| Update Rate Condition | Temperature update period |
| Supply Voltage Operating Range | 2.7 to 5.5 V |
| Quiescent Current | 36 µA typ, 50 µA max |
| Quiescent Current Condition | TA=25 °C, serial bus inactive |
| Quiescent Current Over Temperature | 60 µA max |
| Quiescent Current Over Temperature Condition | -40 °C to +125 °C |
| Shutdown Current | 0.1 µA typ, 1 µA max |
| Shutdown Current Condition | Shutdown mode |
| Shutdown Current Over Temperature | 1 µA max |
| Shutdown Current Over Temperature Condition | Shutdown mode over temperature |
| Specified Temperature Range | -40 to +125 °C |
| Operating Temperature Range | -55 to +125 °C |
| Storage Temperature Range | -60 to +150 °C |
| Thermal Resistance | 200 °C/W |
| Thermal Resistance Condition | Theta JA, SOT23-6 surface-mount |
| Absolute Maximum Supply Voltage | +7 V |
| Absolute Maximum Supply Voltage Condition | Stress rating only |
| Absolute Maximum Input Voltage | -0.3 to +7 V |
| Absolute Maximum Input Voltage Condition | Stress rating only |
| Absolute Maximum Input Current | ±10 mA |
| Absolute Maximum Input Current Condition | Stress rating only |
| Output Short Circuit | Continuous |
| Output Short Circuit Condition | Short-circuit to ground |
| Absolute Maximum Junction Temperature | +150 °C |
| Absolute Maximum Junction Temperature Condition | TJ max |
| Lead Temperature | +300 °C |
| Lead Temperature Condition | Soldering |
| ESD Rating (Human Body Model) | 4000 V |
| ESD Rating (Charged Device Model) | 1000 V |
| SCK Period | 100 ns min |
| SCK Period Condition | SPI timing parameter t1 |
| Data In to Rising Edge SCK Setup Time | 20 ns min |
| Data In to Rising Edge SCK Setup Time Condition | SPI timing parameter t2 |
| SCK Falling Edge to Output Data Delay | 30 ns max |
| SCK Falling Edge to Output Data Delay Condition | SPI timing parameter t3 |
| SCK Rising Edge to Input Data Hold Time | 20 ns min |
| SCK Rising Edge to Input Data Hold Time Condition | SPI timing parameter t4 |
| CS to Rising Edge SCK Setup Time | 40 ns min |
| CS to Rising Edge SCK Setup Time Condition | SPI timing parameter t5 |
| CS to Output Data Delay | 30 ns max |
| CS to Output Data Delay Condition | SPI timing parameter t6 |
| CS Rising Edge to Output High Impedance | 30 ns max |
| CS Rising Edge to Output High Impedance Condition | SPI timing parameter t7 |
| Temperature Register Width | 16-bit read-only register |
| Temperature Register Width Condition | Stores most recent conversion; temperature represented by 10 bits |
| Temperature Data Format | Signed two's complement |
| Temperature Data Format Condition | Use only 10 temperature data bits |
| Recommended Supply Bypass Capacitor | 0.1 µF |
| Recommended Supply Bypass Capacitor Condition | Typical connection recommendation |
| Pin Count | 6 pins |
| Pin Count Condition | SOT23-6 package |
| Pin Functions | GND, SI, V+, SCK, CS, SO |
| Pin Functions Condition | Pin configuration |
| Datasheet Status | request_only |
Product Overview
The TMP125 from Texas Instruments is a digital temperature sensor with an SPI-compatible digital output. Temperature conversion is provided as a 10-bit value with 0.25 °C resolution, and the temperature register is a 16-bit read-only register containing the most recent conversion. Temperature data uses signed two's complement format, with only the 10 temperature data bits used for measurement interpretation.
Electrical operation is specified over a 2.7 to 5.5 V supply range. The temperature input range is -40 to +125 °C, with accuracy specified as ±0.5 °C typical and ±2.0 °C maximum from -25 °C to +85 °C, and ±1.0 °C typical and ±2.5 °C maximum from -40 °C to +125 °C. Conversion time is 60 ms maximum, and the temperature update period is 120 ms maximum.
The device is offered in a 6-pin SOT23-6 (DBV) package with GND, SI, V+, SCK, CS, and SO pins. A 0.1 µF supply bypass capacitor is recommended in the typical connection.
Key Features
- SPI-compatible digital output for temperature data
- 10-bit temperature conversion with 0.25 °C resolution
- -40 to +125 °C temperature measurement range
- ±0.5 °C typical accuracy from -25 °C to +85 °C
- 2.7 to 5.5 V supply operating range
- 36 µA typical quiescent current at 25 °C
- 0.1 µA typical shutdown current
- 60 ms maximum 10-bit conversion time
- 120 ms maximum temperature update period
- 16-bit read-only temperature register
- Signed two's complement temperature data format
- 6-pin SOT23-6 package with SPI pins
Typical Applications
- SPI temperature monitoring
- Board-level thermal measurement
- Low-current embedded sensing
- Shutdown-mode temperature nodes
- Microcontroller temperature interfaces
- SOT23-6 temperature sensing designs
Procurement Notes
When requesting a quote for TMP125, buyers should confirm the manufacturer, package or case, required quantity, target date code, compliance documents, packing method, destination country and expected delivery schedule.
If alternatives are acceptable, buyers should share the approved vendor list, required electrical or optical limits, package constraints and qualification requirements. Any alternative part should be reviewed by the buyer's engineering team before production use.
For analog and signal-chain sourcing, supply voltage, bandwidth, accuracy, noise level, package, temperature grade, input/output configuration and qualification requirements should be verified before approval.
FAQ
What interface does the TMP125 use for temperature output?
The TMP125 provides an SPI-compatible digital output. Its pin functions include SI, SCK, CS, and SO, along with V+ and GND, supporting serial temperature data access through the 6-pin SOT23-6 package.
What temperature range is specified for the TMP125?
The temperature measurement range is -40 to +125 °C, and the device specified temperature range is also -40 to +125 °C. The broader operating temperature range is listed as -55 to +125 °C.
How is TMP125 temperature data formatted?
The TMP125 stores the most recent conversion in a 16-bit read-only temperature register. Temperature is represented by 10 data bits, and the temperature data format is signed two's complement.
What supply voltage and current levels apply to the TMP125?
The TMP125 operates from a 2.7 to 5.5 V supply. Quiescent current is 36 µA typical and 50 µA maximum at 25 °C with the serial bus inactive, while shutdown current is 0.1 µA typical and 1 µA maximum.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 7, 2026.
This page is based on manufacturer datasheet information and LDeepAI sourcing review. Specifications should be verified against the official manufacturer datasheet before final procurement or design approval. Final electrical, optical and reliability approval should be confirmed by the buyer's engineering team.