Texas Instruments TMP303BDRLT

Overview

TMP303BDRLT from Texas Instruments is a factory-programmed temperature switch with dual trip points (TL = 0°C, TH = 55°C), ±0.2°C typical accuracy from –40°C to 125°C, 5 μA maximum quiescent current, and push-pull active-high output - used for battery thermal protection in portable electronics.

For engineers reviewing the TMP303BDRLT datasheet, TMP303BDRLT pinout, TMP303BDRLT application, or TMP303BDRLT equivalent, key selection criteria include factory-set trip window, selectable 1/2/5/10°C hysteresis via HYSTSET pins, 1.4 V to 3.6 V supply operation, SOT-563 micropackage footprint, and SOH test-enabling functionality.

Technical Context

The TMP303BDRLT implements a fixed-window comparator architecture with internal temperature sensor, digital hysteresis logic controlled by two binary inputs (HYSTSET0/HYSTSET1), and a push-pull output stage that drives high when measured temperature exceeds TH or falls below TL. No external components are required beyond a 0.1-μF bypass capacitor.

It operates in a single functional mode: power-on reset asserts OUT high for ≤35 ms, then transitions based on real-time temperature vs. factory-trimmed thresholds. The SOH pin provides deterministic override capability independent of thermal state, enabled by an internal 100-kΩ pulldown resistor.

Key Specifications

Pinout & Package

SOT-563 (DRL) package: 1.60 mm × 1.20 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 and LM75BIMM/NOPB, the TMP303BDRLT delivers lower power consumption, smaller footprint, and hardware-configurable hysteresis - making it optimal for autonomous, battery-critical thermal cutoff functions without MCU dependency.

Availability

TMP303BDRLT is available at Aetrix Electronics and suitable for battery thermal protection, wireless heat detection, and consumer electronics thermal guard applications requiring stable component supply across long-lifecycle programs.

Supply support for TMP303BDRLT 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, power management, and signal chain solutions.

The TMP303 product line is designed for ultra-low-power, autonomous thermal monitoring in space-constrained, battery-operated systems - targeting applications where firmware-free, deterministic thermal response is mandatory.

FAQ

What is the factory-programmed trip temperature range for TMP303BDRLT?

The TMP303BDRLT is factory-programmed with a fixed temperature window of TL = 0°C and TH = 55°C. This means the device asserts its active-high output (OUT) when temperature rises above 55°C or falls below 0°C. Hysteresis is applied symmetrically around these thresholds, and the exact return point depends on the HYSTSET0/HYSTSET1 configuration. No field reprogramming is supported - alternative trip points require ordering different variants like TMP303ADRLT or TMP303CDRLT.

Does TMP303BDRLT require an external pull-up resistor on the OUT pin?

No, TMP303BDRLT does not require an external pull-up resistor on the OUT pin because it features a push-pull output stage capable of actively driving both high and low states. When the output is high, it sources current up to 0.5 mA (at VS ≥ 2 V); when low, it sinks up to 1 mA. This eliminates external components and ensures robust interfacing with MCU GPIOs, FET gates, or logic inputs without signal degradation due to weak pull-ups.

How is hysteresis configured on TMP303BDRLT?

Hysteresis on TMP303BDRLT is configured using two digital input pins: HYSTSET0 and HYSTSET1. Each pin must be tied either to GND or VS (supply voltage) to select one of four hysteresis values: 1°C (both pins GND), 2°C (HYSTSET0 = VS, HYSTSET1 = GND), 5°C (HYSTSET0 = GND, HYSTSET1 = VS), or 10°C (both pins VS). These connections are static and determine the temperature margin between trip assertion and release - critical for preventing output oscillation near threshold boundaries.

What is the role of the SOH pin on TMP303BDRLT?

The SOH (Set Output High) pin on TMP303BDRLT provides hardware-level output override: when pulled high, it forces the OUT pin to assert high regardless of measured temperature or hysteresis state. Internally, SOH is pulled down with a 100-kΩ resistor, so leaving it floating or grounding it has no effect on normal operation. This feature enables production test verification of the entire output signal path - including PCB traces, connectors, and downstream logic - without requiring thermal cycling equipment.

Can TMP303BDRLT operate from a 1.5 V alkaline battery?

Yes, TMP303BDRLT supports operation down to 1.4 V, making it compatible with single-cell alkaline (1.5 V nominal) and NiMH (1.2 V nominal) batteries across their full discharge curve. Its 5 μA maximum quiescent current ensures minimal voltage droop under load, and its push-pull output maintains valid logic levels even at 1.4 V supply (VOH ≥ 0.8 × VS, VOL ≤ 0.2 × VS). This enables reliable use in legacy battery-powered devices where regulated supplies are unavailable.