Texas Instruments TMP122AIDBVT

Overview

TMP122AIDBVT from Texas Instruments is a SPI-compatible digital temperature sensor in SOT23-6 package, delivering ±1.5°C accuracy from –25°C to +85°C and ±2.0°C from –40°C to +125°C, with programmable 9–12-bit resolution and active-low ALERT output for thermal event detection in embedded power-supply monitoring systems.

For engineers reviewing the TMP122AIDBVT datasheet, TMP122AIDBVT pinout, TMP122AIDBVT application, or TMP122AIDBVT equivalent, this page provides verified functional specifications, validated SOT23-6 terminal mapping, confirmed thermal accuracy over industrial temperature range, and two documented alternative parts with explicit resolution, alert logic, and interface differences.

Technical Context

The TMP122AIDBVT integrates a precision silicon diode temperature sensor, sigma-delta A/D converter, oscillator, control logic, and SPI-compatible serial interface - all on a single die. Its architecture supports continuous conversion with user-selectable resolution (9–12 bits), programmable high/low temperature thresholds, and configurable alert polarity and fault queue depth.

It operates from 2.7V to 5.5V, draws only 50µA quiescent current, and enters sub-1µA shutdown mode via SPI command. The device uses a 16-bit read/write register map (Temperature, Configuration, TLOW, THIGH) with pointer-based addressing and supports full-duplex SPI timing compliant with t1 ≥100ns SCK period and t2 ≥20ns setup requirements.

Key Specifications

Pinout & Package

SOT23-6 surface-mount package (DBV), 1.45 mm max height, JEDEC MO-178 compliant, with 0.95 mm lead pitch and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor applications.

Compared with TMP122AIDBVT, TMP117MDSGR offers superior accuracy but sacrifices SPI compatibility and hardware alert signaling, while MAX31820MUA+ reduces wiring count via 1-Wire yet removes resolution programming and configurable thermostat modes - making TMP122AIDBVT optimal for SPI-based industrial thermal management with deterministic interrupt response.

Availability

TMP122AIDBVT is available at Aetrix Electronics and suitable for power-supply monitoring, computer peripheral protection, and battery management applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TMP122AIDBVT 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 analog and embedded processing chips for industrial, automotive, and communications markets since 1930.

The TMP122 product line delivers highly integrated, low-power digital temperature sensors targeting thermal protection and management in space-constrained, battery-sensitive, and industrial-grade electronic systems.

FAQ

What is the maximum operating temperature of the TMP122AIDBVT?

The TMP122AIDBVT is specified for operation from –40°C to +125°C and functions up to +150°C. Its absolute maximum junction temperature is +150°C, and it maintains ±2.0°C accuracy across the full –40°C to +125°C range. Operation beyond +125°C is possible for short durations but degrades long-term reliability and is not covered by TI's production test limits.

Does the TMP122AIDBVT require external components to operate?

Yes - the TMP122AIDBVT requires a 0.1µF bypass capacitor between V+ and GND, and a pull-up resistor (typically 4.7kΩ) on the ALERT pin. No external crystal, reference, or signal conditioning components are needed. All timing, conversion, and interface logic are fully integrated, making the TMP122AIDBVT a true single-component thermal sensing solution.

How does the ALERT pin function in Comparator Mode on the TMP122AIDBVT?

In Comparator Mode (TM1/TM0 = 0/0), the TMP122AIDBVT's ALERT pin goes active-low when temperature reaches or exceeds the THIGH register value and remains asserted until temperature falls below the TLOW register value - both subject to the configured fault queue count (F1/F0). This provides hysteresis-based thermal switching without host processor involvement.

Can the TMP122AIDBVT be used with an I²C host controller?

No - the TMP122AIDBVT supports SPI-compatible 3-wire serial communication only (CS, SCK, SO/I). It does not implement I²C protocol, address decoding, or open-drain bidirectional SDA/SCL signaling. Attempting I²C connection will result in communication failure. For I²C systems, consider TI's TMP117 or TMP235 families instead.

What is the default resolution setting of the TMP122AIDBVT after power-up?

The TMP122AIDBVT powers up with R1/R0 bits set to 1/1, configuring the ADC for 12-bit resolution (0.0625°C step size). This is confirmed in the Configuration Register description in SBOS272B Rev. December 2003, where "power-up/reset value of the Configuration Register bits R1/R0 equal 1/1" is explicitly stated. Conversion time defaults to 240ms.