Texas Instruments TMP122AMDBVTEP

Overview

TMP122AMDBVTEP from Texas Instruments is a military-grade, 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 –55°C to 125°C, with programmable 9–12-bit resolution, 50 µA quiescent current, and operation up to 150°C - deployed in aerospace thermal protection and defense system monitoring.

For engineers reviewing the TMP122AMDBVTEP datasheet, TMP122AMDBVTEP pinout, TMP122AMDBVTEP application, or TMP122AMDBVTEP equivalent, this page delivers verified electrical specs, register-level interface behavior, military-qualified thermal performance, and real-world design implications for high-reliability embedded sensing.

Technical Context

The TMP122AMDBVTEP implements a sigma-delta ADC with programmable resolution (9–12 bits + sign), internal reference, and continuous conversion mode. Its SPI-compatible serial interface supports MSB-first 16-bit read/write transfers with CS-controlled frame synchronization and embedded register addressing via D4/D3 bits.

It features three user-accessible registers - Temperature (read-only), Configuration (R1/R0 resolution, TM1/TM0 thermostat mode, POL polarity, F1/F0 fault queue), and dual threshold registers (TLOW/THIGH) - enabling autonomous alerting without host intervention in comparator, interrupt, or hybrid modes.

Key Specifications

Pinout & Package

SOT23-6 package (DBV), 1.45 mm max height, JEDEC MO-178 compliant, with exposed metal pad for thermal enhancement and mechanical stability in high-vibration environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX31820MUA+T and LM75BIMMX/NOPB, the TMP122AMDBVTEP uniquely combines military qualification, SPI-native operation with zero-polling alerting, and programmable resolution/fault response - making it the only option qualified for defense/aerospace thermal management where deterministic timing and field reliability are non-negotiable.

Availability

TMP122AMDBVTEP is available at Aetrix Electronics and suitable for aerospace engine monitoring, defense system thermal protection, and medical imaging power supply monitoring requiring stable component supply across extended product lifecycles and controlled baselines.

Supply support for TMP122AMDBVTEP 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 high-reliability components, with decades of heritage in precision sensing and military-grade IC development.

The TMP122-EP product line was engineered specifically for defense, aerospace, and medical applications demanding extended temperature operation, controlled manufacturing baselines, and long-term supply chain assurance - not general-purpose thermal sensing.

FAQ

What is the absolute maximum junction temperature for the TMP122AMDBVTEP?

The absolute maximum junction temperature for the TMP122AMDBVTEP is 150°C, as specified in the Absolute Maximum Ratings table. This value is distinct from its qualified operating range of –55°C to 125°C and reflects the thermal limit beyond which permanent damage may occur. Operation at or near 150°C is permissible only for short durations and requires careful thermal design - including PCB copper area, airflow, and proximity to heat sources - to ensure sustained reliability. The TMP122AMDBVTEP datasheet confirms this rating applies across all SOT23-6 packaged variants.

Does the TMP122AMDBVTEP support true SPI mode or only SPI-compatible timing?

The TMP122AMDBVTEP implements SPI-compatible timing and protocol but does not support all four standard SPI modes (CPOL/CPHA combinations). It operates exclusively in Mode 0 (CPOL = 0, CPHA = 0): SCK idles low, data sampled on the first rising edge, and data shifted out on the falling edge. Its CS-active-low framing, MSB-first 16-bit transfers, and embedded register addressing align with SPI conventions, enabling direct interface with standard SPI controllers without bit-banging. The TMP122AMDBVTEP datasheet explicitly states "SPI-Compatible Interface" and provides timing diagrams confirming Mode 0 compliance.

How does the fault queue setting affect ALERT pin behavior in Comparator Mode for the TMP122AMDBVTEP?

In Comparator Mode (TM1/TM0 = 0/0), the TMP122AMDBVTEP requires the number of consecutive temperature violations defined by the F1/F0 bits (1, 2, 4, or 6) before asserting the ALERT pin. Once asserted, ALERT remains active until the temperature falls below TLOW for the same number of consecutive measurements. This dual-threshold, multi-sample validation prevents spurious alerts from noise or transient overshoot. For example, with F1/F0 = 1/0 (4 faults), the TMP122AMDBVTEP will not trigger ALERT until four successive conversions exceed THIGH, and will hold ALERT until four successive readings fall below TLOW - a behavior confirmed in the APPLICATION INFORMATION section of the TMP122AMDBVTEP datasheet.

Can the TMP122AMDBVTEP be used without an external pull-up resistor on the ALERT pin?

No - the TMP122AMDBVTEP ALERT pin is open-drain and requires an external pull-up resistor to function correctly. The datasheet specifies a recommended 4.7 kΩ pull-up to V+ for proper logic-level definition and noise immunity. Without this resistor, the ALERT pin cannot drive a valid HIGH state, rendering autonomous alerting in Comparator or Interrupt Mode nonfunctional. This requirement is explicitly stated in the APPLICATION INFORMATION section and reflected in Figure 1 (Typical Connections) of the TMP122AMDBVTEP datasheet. Omitting the pull-up compromises the core value proposition of hardware-based thermal supervision.

What is the power-on default configuration for resolution and thermostat mode in the TMP122AMDBVTEP?

At power-on or reset, the TMP122AMDBVTEP defaults to 12-bit resolution (R1/R0 = 1/1) and Comparator Mode (TM1/TM0 = 0/0). These values are stored in the Configuration Register, whose power-up state is defined in Table 6 of the datasheet. The 12-bit default yields 0.0625°C resolution and 240 ms typical conversion time, while Comparator Mode enables immediate autonomous ALERT assertion upon crossing THIGH/TLOW thresholds without host intervention. All other Configuration Register bits (POL, F1/F0, D1/D0 delay) also initialize to documented default states - ensuring predictable, repeatable startup behavior critical for safety-critical deployments of the TMP122AMDBVTEP.