Texas Instruments TMP303GDRLT

Overview

TMP303GDRLT from Texas Instruments is a factory-programmed temperature switch with fixed trip window (0°C to 90°C), push-pull active-high output, and user-selectable hysteresis (1/2/5/10°C). It operates from 1.4 V to 3.6 V, draws ≤5 μA quiescent current, and delivers ±0.2°C typical trip accuracy over –40°C to 125°C - enabling battery thermal protection in ultra-low-power wireless sensors.

For engineers reviewing the TMP303GDRLT datasheet, TMP303GDRLT pinout, TMP303GDRLT application, or TMP303GDRLT equivalent, key selection criteria include factory-set 0°C/90°C trip points, SOT-563 micropackage footprint (1.60 × 1.20 mm), hysteresis configuration via HYSTSET0/HYSTSET1 pins, and SOH test functionality for output verification without temperature cycling.

Technical Context

The TMP303GDRLT integrates a precision bandgap temperature sensor, digital trip-point logic, and push-pull output driver - all operating autonomously without microcontroller intervention. Its trip thresholds are laser-trimmed at wafer level for 0°C (TL) and 90°C (TH), with hysteresis selected by static logic levels on two dedicated input pins (HYSTSET0/HYSTSET1).

Functional behavior is defined by three independent control paths: (1) temperature sensing → trip comparison → OUT state change; (2) SOH pin override forcing OUT high regardless of temperature; (3) hysteresis window selection determining return threshold (e.g., TH − hysteresis = 80°C for 10°C hysteresis). Power-up sequence asserts OUT high for ≤35 ms before settling to temperature-dependent state.

Key Specifications

Pinout & Package

SOT-563 package: 1.60 mm × 1.20 mm body, 0.6 mm height, 6-pin leadless construction with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6505UTP+T and LM75BIMM/NOPB, the TMP303GDRLT provides tighter trip accuracy (±0.2°C vs ±3°C or ±2°C), lower power (5 μA vs 12 μA or 250 μA), and smaller footprint (SOT-563 vs SC70-5 or MSOP-8) - making it optimal for space- and energy-constrained thermal cutoff applications.

Availability

TMP303GDRLT is available at Aetrix Electronics and suitable for battery thermal protection, wireless heat detection, and simple fan control requiring stable component supply across industrial, medical, and consumer electronics programs.

Supply support for TMP303GDRLT 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and low-power sensor solutions.

The TMP303 product line delivers factory-programmed, micropackage temperature switches for ultra-low-power thermal monitoring - designed specifically for battery-operated IoT endpoints, wearables, and safety-critical thermal cutoff systems.

FAQ

What is the factory-set trip temperature range for TMP303GDRLT?

The TMP303GDRLT is factory-programmed with a fixed low-trip point (TL) of 0°C and high-trip point (TH) of 90°C. This specific variant (G-grade) cannot be reconfigured in the field - trip points are laser-trimmed during manufacturing. The device asserts its active-high output when temperature exceeds 90°C and clears it only after falling below (90°C − hysteresis), where hysteresis is set via HYSTSET0/HYSTSET1 pins. No external components or firmware are needed to achieve this behavior.

How does the SOH pin function on TMP303GDRLT?

The SOH (Set Output High) pin on TMP303GDRLT is a dedicated diagnostic input with an internal 100 kΩ pulldown resistor. When left floating or grounded, it has no effect on TMP303GDRLT operation. When pulled high (to VS), it forces the OUT pin into a high state immediately - regardless of measured temperature or hysteresis settings. This enables hardware-level verification of the output path (e.g., checking MCU GPIO interrupt response or fan driver connection) without requiring thermal chamber cycling or temperature simulation.

What hysteresis values can be selected on TMP303GDRLT and how are they configured?

TMP303GDRLT supports four discrete hysteresis values: 1°C, 2°C, 5°C, and 10°C. These are selected by applying logic levels (GND or VS) to the HYSTSET0 and HYSTSET1 pins per the truth table in the datasheet: GND/GND = 1°C, GND/VS = 2°C, VS/GND = 5°C, VS/VS = 10°C. Configuration is static - no dynamic control or voltage thresholds. For example, tying both pins to GND configures TMP303GDRLT to assert OUT high above 90°C and clear it only below 89°C (10°C hysteresis would yield 80°C clearance threshold).

Can TMP303GDRLT operate from a 1.5 V alkaline battery?

Yes, TMP303GDRLT operates across 1.4 V to 3.6 V, making it fully compatible with 1.5 V alkaline batteries throughout their discharge curve. At 1.5 V, specifications remain valid: trip accuracy holds at ±0.2°C typical, quiescent current stays ≤5 μA, and output logic levels meet VOH ≥ 1.3 V (VS − 0.2 V) and VOL ≤ 0.3 V (0.2 × VS). The device powers up cleanly with no brown-out reset circuitry required - start-up time remains ≤35 ms even at minimum supply.

Is a bypass capacitor required for stable operation of TMP303GDRLT?

Yes, TI strongly recommends a 0.1 µF X5R or X7R ceramic capacitor placed as close as possible between VS and GND pins of TMP303GDRLT. This capacitor suppresses supply noise and prevents false trips caused by transient voltage droop during output switching or thermal events. Layout guidelines specify minimizing the loop area formed by the capacitor, VS, and GND traces. Omitting the capacitor may cause erratic OUT behavior, especially in noisy environments or when driving capacitive loads like long PCB traces or optocoupler inputs.