Texas Instruments TMP122AIDBVR

Overview

TMP122AIDBVR 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, 50µA quiescent current, and operation up to +150°C - used for thermal protection in battery management and notebook computers.

For engineers reviewing the TMP122AIDBVR datasheet, TMP122AIDBVR pinout, TMP122AIDBVR application, or TMP122AIDBVR equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts, and supply-chain support for industrial and embedded thermal monitoring designs.

Technical Context

The TMP122AIDBVR integrates a precision silicon diode temperature sensor, sigma-delta A/D converter, oscillator, control logic, and SPI serial interface - all on a single die. Its ALERT pin supports comparator, interrupt, or interrupt-comparator modes via programmable TM1/TM0 bits and fault queue (F1/F0) for noise-immune thermal event detection.

Communication uses a 16-bit SPI frame with sign-bit-first MSB-aligned data; CS initiates transfers, SCK clocks data, and SO/I serves as bidirectional serial I/O. The internal READ address register (P1/P0) selects Temperature, Configuration, TLOW, or THIGH registers - enabling full configuration without external components beyond a pull-up resistor on ALERT and 0.1µF V+ bypass capacitor.

Key Specifications

Pinout & Package

SOT23-6 surface-mount package (DBV), 1.45 mm max height, JEDEC MO-178 compliant, moisture sensitivity level 2 (260°C peak reflow, 1 year floor life). Pin 1 marked by index area; tape-and-reel packaging (3000 pcs/reel), Q3 quadrant orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMP122AIDBVR, TMP124AIDR offers identical functionality in a larger SO-8 package with extended low-temperature capability, while LM75BIMM/NOPB provides a lower-cost I²C alternative with reduced feature set and no pin compatibility - making TMP122AIDBVR optimal for space-constrained, SPI-based, high-flexibility thermal monitoring.

Availability

TMP122AIDBVR is available at Aetrix Electronics and suitable for battery management, notebook computer thermal protection, and office machine safety applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing.

Supply support for TMP122AIDBVR 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 leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in precision sensing and low-power IC design.

The TMP122 product line was designed specifically for high-accuracy, low-quiescent-current digital temperature sensing in space-constrained, battery-operated, and thermally critical applications - emphasizing SPI simplicity, configurability, and robustness across extended industrial temperature ranges.

FAQ

What is the maximum operating temperature of the TMP122AIDBVR?

The TMP122AIDBVR is specified for operation from –40°C to +125°C and can function up to +150°C, though accuracy degrades beyond the specified range. Its junction temperature limit is +150°C, and thermal resistance (θJA) is 200°C/W in the SOT23-6 package - requiring careful PCB thermal design for sustained high-temperature use. The TMP122AIDBVR maintains functional integrity at these extremes but should be derated per application-specific reliability requirements.

Does the TMP122AIDBVR require external components to operate?

Yes - the TMP122AIDBVR requires only two external components: a 0.1µF ceramic bypass capacitor on the V+ pin (placed within 2 mm of the device) and a pull-up resistor (typically 4.7kΩ to V+) on the open-drain ALERT pin. No external crystal, reference, or signal conditioning is needed. All timing, conversion, and interface logic are fully integrated, making the TMP122AIDBVR a true single-chip solution for digital temperature sensing.

How does the programmable resolution affect conversion time in the TMP122AIDBVR?

In the TMP122AIDBVR, resolution directly determines conversion time: 9-bit mode takes 30ms, 10-bit 60ms, 11-bit 120ms, and 12-bit 240ms (typical). This linear relationship arises from the sigma-delta ADC's oversampling architecture - higher resolution requires more samples to reduce quantization noise. Firmware can dynamically adjust R1/R0 bits in the Configuration Register to balance measurement precision against system latency and power consumption.

Can the TMP122AIDBVR be used with an I²C host controller?

No - the TMP122AIDBVR implements a 3-wire SPI-compatible interface (CS/SCK/SO-I) and does not support I²C protocol. It lacks I²C address pins, ACK/NACK signaling, or clock stretching capability. Attempting I²C communication will result in failed reads/writes and undefined behavior. For I²C systems, consider alternatives like the LM75B or TMP102 - but note these differ in accuracy, resolution, and feature set versus the TMP122AIDBVR.

What is the purpose of the fault queue setting in the TMP122AIDBVR?

The fault queue (F1/F0 bits) in the TMP122AIDBVR configures how many consecutive out-of-limit temperature readings are required before the ALERT pin activates - preventing false triggers from transient noise or short spikes. Settings range from 1 to 6 faults; default is 1. This feature is especially valuable in electrically noisy environments like motor drives or switch-mode power supplies, where the TMP122AIDBVR maintains thermal event integrity without requiring external filtering or firmware debouncing.