Texas Instruments TMP303ADRLT

Overview

TMP303ADRLT from Texas Instruments is a factory-programmed temperature switch with fixed trip window (TL = 0°C, TH = 60°C), ±0.2°C typical accuracy over –40°C to 125°C, 5 μA max quiescent current, and push-pull active-high output. It operates from 1.4 V to 3.6 V and delivers precise thermal monitoring in battery-powered consumer electronics and wireless heat detectors.

For engineers reviewing the TMP303ADRLT datasheet, TMP303ADRLT pinout, TMP303ADRLT application, or TMP303ADRLT equivalent, key selection factors include factory-set 0°C/60°C trip points, selectable 1/2/5/10°C hysteresis via HYSTSET0/HYSTSET1 pins, SOT-563 package footprint (1.60 × 1.60 × 0.6 mm), and SOH pin for forced-output test functionality.

Technical Context

The TMP303ADRLT integrates a precision bandgap temperature sensor, digital trip-point logic, and push-pull output driver - all operating autonomously without microcontroller intervention. Its hysteresis is configured statically via two digital input pins (HYSTSET0/HYSTSET1), supporting four discrete windows (1/2/5/10°C) determined by GND/VS logic levels.

It features an internal 100-kΩ pulldown on the SOH pin, enabling system-level output verification independent of temperature. Power-up behavior asserts OUT = high for up to 35 ms before settling, with conversion timing stabilized at ≤1 s per thermal transition after initial start-up.

Key Specifications

Pinout & Package

SOT-563 (DRL) package: 1.60 mm × 1.60 mm × 0.6 mm body size, 6-pin surface-mount, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6505UTP+T, TMP303ADRLT offers lower quiescent current and push-pull output eliminating pull-up resistors; compared with LM75BIMM/NOPB, it provides true hardware autonomy and 50× lower active current but lacks digital configurability.

Availability

TMP303ADRLT is available at Aetrix Electronics and suitable for battery thermal protection, wireless heat detection, and consumer electronics thermal guard applications requiring stable component supply and long-lifecycle support.

Supply support for TMP303ADRLT 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 delivering analog and embedded processing solutions, with leadership in precision analog, low-power design, and industrial-grade reliability.

The TMP303 product line delivers factory-programmed, ultra-low-power temperature switches for autonomous thermal monitoring in space- and energy-constrained systems - targeting battery-powered IoT sensors, portable electronics, and industrial safety controls.

FAQ

What is the factory-configured trip temperature range for TMP303ADRLT?

The TMP303ADRLT is factory-programmed with a fixed low trip point (TL) of 0°C and high trip point (TH) of 60°C. This configuration is permanent and cannot be altered in-circuit. The device asserts its active-high OUT pin when temperature rises above 60°C and clears only after falling below (60°C – hysteresis), where hysteresis is set via HYSTSET0/HYSTSET1 pins. No reprogramming or calibration is supported for TMP303ADRLT.

Does TMP303ADRLT require external components to operate?

No, TMP303ADRLT operates autonomously with no external components required for basic functionality. Only a 0.1-μF ceramic bypass capacitor between VS and GND is recommended for supply noise suppression. Unlike comparator-based solutions, it needs no resistors, thermistors, or reference voltage sources. The push-pull output eliminates the need for a pull-up resistor, and hysteresis is configured solely via HYSTSET0/HYSTSET1 logic levels - making TMP303ADRLT a true single-component thermal switch.

How does the SOH pin function on TMP303ADRLT?

The SOH (Set Output High) pin on TMP303ADRLT is a digital input with an internal 100-kΩ pulldown resistor. When left floating or grounded, SOH has no effect on device operation. When pulled high (≥0.7 × VS), it forces the OUT pin into a high state immediately - regardless of measured temperature or hysteresis settings. This feature enables production test verification of the output path without thermal cycling, simplifying functional testing in manufacturing. TMP303ADRLT's SOH behavior is defined in Section 8.3.1 of the SBOS486I datasheet.

What hysteresis values are supported by TMP303ADRLT and how are they selected?

TMP303ADRLT supports four discrete hysteresis values: 1°C, 2°C, 5°C, and 10°C. Selection is performed by setting logic levels on HYSTSET0 and HYSTSET1 pins: both GND = 1°C; HYSTSET0 = GND, HYSTSET1 = VS = 2°C; HYSTSET0 = VS, HYSTSET1 = GND = 5°C; both VS = 10°C. These pins must be hard-wired to GND or VS (not left floating) to ensure deterministic hysteresis. The mapping is documented in Table 1 of the TMP303 datasheet (SBOS486I), and applies identically to TMP303ADRLT.

Is TMP303ADRLT compatible with 1.8 V and 3.3 V supply rails?

Yes, TMP303ADRLT operates across 1.4 V to 3.6 V, fully covering both 1.8 V and 3.3 V nominal supply rails. At 1.8 V, output high voltage (VOH) is guaranteed ≥1.4 V (VS – 0.4 V), and output low voltage (VOL) is ≤0.4 V - compatible with standard 1.8 V logic inputs. At 3.3 V, VOH reaches ≥2.9 V and VOL ≤0.4 V, ensuring robust interfacing with 3.3 V MCUs and peripherals. Electrical characteristics across this range are specified in Section 7.5 of the SBOS486I datasheet for TMP303ADRLT.