Specifications
| Type | Description |
|---|---|
| Part Number | TMP121 |
| Manufacturer | Texas Instruments |
| Product Type | Digital temperature sensor |
| Category | Sensor |
| Package / Case | SOT23-6, package designator DBV |
| Interface | SPI-compatible digital output |
| Temperature Resolution | 12-bit + sign, 0.0625 °C |
| Temperature Input Range | -40 to +125 °C; electrical characteristics, TA=-40°C to +125°C, V+=2.7V to 5.5V |
| Temperature Accuracy | typ ±0.5 °C, max ±1.5 °C; -25°C to +85°C |
| Temperature Accuracy | typ ±1.0 °C, max ±2.0 °C; -40°C to +125°C |
| Temperature Accuracy | typ ±1.5 °C; -40°C to +150°C |
| Temperature Error vs Supply | min -0.3 °C/V, typ 0.1 °C/V, max +0.3 °C/V |
| Digital Temperature Resolution | ±0.0625 °C |
| Input High Voltage | min 0.7 × V+ V; VIH digital input logic level |
| Input Low Voltage | max 0.3 × V+ V; VIL digital input logic level |
| Input Current | max ±1 µA; SO, SCK, CS; 0V ≤ VIN ≤ V+ |
| Output Low Voltage | max 0.4 V; SO, ISINK=3 mA |
| Output High Voltage | min V+ - 0.4 V; SO, ISOURCE=2 mA |
| Digital Output Resolution | 12 bits |
| Input Capacitance | typ 2.5 pF; SO, SCK, CS |
| Conversion Time | typ 240 ms, max 320 ms; 12-bit conversion |
| Conversion Period | typ 480 ms, max 640 ms; 12-bit conversion; period between conversion starts |
| Supply Voltage Operating Range | 2.7 to 5.5 V |
| Quiescent Current | typ 35 µA, max 50 µA; serial bus inactive |
| Shutdown Current | typ 0.1 µA, max 1 µA; TMP121, serial bus inactive |
| Specified Temperature Range | -40 to +125 °C |
| Operating Temperature Range | -55 to +150 °C |
| Storage Temperature Range | -60 to +150 °C |
| Thermal Resistance | 200 °C/W; θJA, SOT23-6 surface-mount |
| Absolute Maximum Supply Voltage | 7 V; power supply V+ |
| Absolute Maximum Input Voltage | -0.3 to +7 V; applies to all TMP121 and TMP123 input voltages |
| Absolute Maximum Input Current | 10 mA |
| Absolute Maximum Operating Temperature Range | -55 to +150 °C |
| Absolute Maximum Storage Temperature Range | -60 to +150 °C |
| Maximum Junction Temperature | +150 °C; TJ max |
| Lead Temperature | +300 °C; soldering |
| Temperature Register Width | 16-bit signed read-only register; stores most recent conversion output |
| Temperature Data Format | Binary two's complement, sign bit first; 16-bit data word output |
| Power-up Temperature Register Value | 0 °C; following power-up or reset until first conversion is complete |
| SCK Period | min 100 ns; SPI timing parameter t1 |
| SCK Falling Edge to Output Data Delay | max 30 ns; SPI timing parameter t2 |
| CS to Rising Edge SCK Setup Time | min 40 ns; SPI timing parameter t3 |
| CS to Output Data Delay | max 30 ns; SPI timing parameter t4 |
| CS Rising Edge to Output High Impedance | max 30 ns; SPI timing parameter t5 |
| Recommended Bypass Capacitor | 0.1 µF; supply bypass capacitor recommended; no external components required for operation |
| Pin Count | 6 pins; SOT23-6 package |
| TMP121 Pinout | Pin 1 NC, Pin 2 GND, Pin 3 V+, Pin 4 SCK, Pin 5 CS, Pin 6 SO; top view SOT23-6 |
| Datasheet Status | request_only |
Product Overview
TMP121 is a Texas Instruments digital temperature sensor with an SPI-compatible serial output. It stores the most recent conversion in a 16-bit signed read-only temperature register and outputs a 16-bit data word in binary two's complement format with the sign bit first. Following power-up or reset, the temperature register reads 0 °C until the first conversion is complete.
The device supports 12-bit digital output resolution with 0.0625 °C temperature resolution. Accuracy is specified as typical ±0.5 °C and maximum ±1.5 °C from -25 °C to +85 °C, and typical ±1.0 °C and maximum ±2.0 °C across -40 °C to +125 °C. The 12-bit conversion time is 240 ms typical and 320 ms maximum.
TMP121 is supplied in a 6-pin SOT23-6 package, designator DBV. The top-view pinout is NC, GND, V+, SCK, CS, and SO. Operation uses a 2.7 to 5.5 V supply, and a 0.1 µF supply bypass capacitor is recommended while no external components are required for operation.
Key Features
- SPI-compatible digital temperature output
- 12-bit plus sign temperature resolution
- 0.0625 °C digital temperature step size
- 2.7 V to 5.5 V supply operation
- 35 µA typical quiescent current
- 0.1 µA typical shutdown current
- 240 ms typical 12-bit conversion time
- 16-bit signed read-only temperature register
- Binary two's-complement temperature data format
- SOT23-6 DBV package with six pins
Typical Applications
- SPI digital temperature measurement
- Board-level thermal sensing
- Low-current temperature monitoring
- SOT23-6 compact sensor designs
- 2.7 V to 5.5 V systems
- Two's-complement temperature data handling
Procurement Notes
When requesting a quote for TMP121, 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 TMP121 use for temperature data?
The TMP121 provides an SPI-compatible digital output. Its serial interface uses SCK, CS, and SO pins, and the temperature data is output as a 16-bit word in binary two's-complement format with the sign bit first.
What temperature resolution is specified for the TMP121?
The TMP121 has 12-bit plus sign temperature resolution with a 0.0625 °C step size. The datasheet also lists digital output resolution as 12 bits and digital temperature resolution as ±0.0625 °C.
What supply voltage range does the TMP121 support?
The specified operating supply voltage range is 2.7 V to 5.5 V. The absolute maximum supply voltage for the V+ power supply pin is 7 V.
What package and pinout are used by the TMP121?
The TMP121 is supplied in a SOT23-6 package with package designator DBV. The top-view pinout is Pin 1 NC, Pin 2 GND, Pin 3 V+, Pin 4 SCK, Pin 5 CS, and Pin 6 SO.
Technical Review & Sourcing Note
Prepared by LDeepAI Component Sourcing Team. Reviewed for RFQ, documentation and alternative sourcing use. Last updated: July 8, 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.