Texas Instruments TMP300AIDBVT

Overview

TMP300AIDBVT from Texas Instruments is a resistor-programmable temperature switch and analog-output temperature sensor in SC70-6 package, featuring ±1°C typical accuracy at +25°C, 10 mV/°C analog output, programmable trip point via external RSET, 5°C/10°C selectable hysteresis, and open-drain digital output - used for overtemperature protection in DC-DC modules and power-supply systems.

For engineers reviewing the TMP300AIDBVT datasheet, TMP300AIDBVT pinout, TMP300AIDBVT application, or TMP300AIDBVT equivalent, key selection considerations include its 1.8 V to 18 V supply range, –40°C to +125°C operating range, SC70-6 thermal performance (θJA = 250°C/W), low 110 μA max quiescent current, and dual-function role as both thermal trip device and analog temperature monitor.

Technical Context

The TMP300AIDBVT integrates a precision bandgap-based temperature sensor with a comparator whose threshold is set by an external resistor (RSET) connected to the TSET pin. Its internal 3 μA bias current enables direct calculation of RSET using TSET = 50°C + 3×RSET(kΩ), supporting accurate trip-point programming across –40°C to +125°C.

Hysteresis is selected digitally via HYSTSET pin logic level: grounded for 5°C hysteresis, tied to V+ for 10°C hysteresis. The high-impedance (210 kΩ) VTEMP analog output provides 10 mV/°C scaling and can be used for system-level temperature monitoring or forced-trip testing without altering thermal conditions.

Key Specifications

Pinout & Package

Package: SC70-6 (DCK), body size 2.00 mm × 1.25 mm, 1.1 mm max height, JEDEC MO-203 AB compliant, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar temperature switch and analog sensor applications.

Compared with TMP300BIDCKR, TMP300AIDBVT trades guaranteed full-range accuracy for lower cost while retaining identical functionality and SC70-6 footprint; versus TMP235DBVT, it adds indispensable hardware-level overtemperature response but requires additional external components for analog signal conditioning due to higher output impedance.

Availability

TMP300AIDBVT is available at Aetrix Electronics and suitable for power-supply systems, DC-DC modules, and electronic protection systems requiring stable component supply, long-term lifecycle support, and consistent thermal performance across production batches.

Supply support for TMP300AIDBVT 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and power efficiency.

The TMP300 product line targets thermally constrained power systems needing simple, low-power, resistor-configurable thermal protection - designed specifically for integration into compact DC-DC converters, industrial power supplies, and safety-critical thermal monitoring circuits.

FAQ

What is the function of the HYSTSET pin on the TMP300AIDBVT?

The HYSTSET pin on the TMP300AIDBVT selects hysteresis mode: grounding it configures 5°C hysteresis, while connecting it to V+ sets 10°C hysteresis. This prevents output oscillation during slow thermal transitions near the trip point. The pin has defined logic thresholds (0.4 V low, VS – 0.4 V high), and its state is sampled continuously - ensuring reliable hysteresis behavior across the full –40°C to +125°C range of the TMP300AIDBVT.

How do I calculate the RSET resistor value for a desired trip temperature on the TMP300AIDBVT?

For the TMP300AIDBVT, use RSET (kΩ) = 10 × (50 + TC) / 3, where TC is the desired trip temperature in °C. For example, a 75°C trip requires RSET = 10 × (50 + 75) / 3 ≈ 417 kΩ. This equation derives from the device's internal 3 μA bias current and is valid across the full operating range. The TMP300AIDBVT datasheet confirms this relationship in Section 7.2.1 and validates it with ±2°C total accuracy over temperature.

Can the VTEMP pin of the TMP300AIDBVT be used to force a trip event for system testing?

Yes, the VTEMP pin of the TMP300AIDBVT can be driven externally with a voltage source to simulate a thermal event and trigger the OUT pin - enabling safe, repeatable validation of downstream protection circuitry without actual heating. As shown in Figure 7-1 of the TMP300AIDBVT datasheet, applying a voltage ≥ TSET threshold to VTEMP forces comparator activation. This feature is unique to the TMP300AIDBVT family and eliminates need for thermal chambers during functional test.

What is the maximum load that can be applied to the VTEMP pin of the TMP300AIDBVT without degrading accuracy?

The VTEMP pin of the TMP300AIDBVT has a nominal output resistance of 210 kΩ and must be loaded with ≥10 kΩ to avoid significant error (>0.5°C). Loading below 10 kΩ causes voltage droop and shifts the trip point. TI recommends buffering VTEMP with an op-amp (e.g., OPA335) when driving ADC inputs or long traces - as illustrated in Figure 7-2 of the TMP300AIDBVT datasheet - to preserve both analog measurement fidelity and digital trip accuracy.

Is the TMP300AIDBVT pin-compatible with other variants in the TMP300 family?

Yes, the TMP300AIDBVT is pin-compatible with all SC70-6 variants in the TMP300 family, including TMP300BIDCKR and TMP300BIDCKT, sharing identical DCK package outline, pin numbering, and electrical pin functions. However, TMP300AIDBVT differs in accuracy specification (±4°C max vs. ±2°C for 'B' grade) and lifecycle status (NRND vs. Active for TMP300BIDCKR). No PCB changes are required when substituting within the SC70-6 variant group.