Texas Instruments TMP235A4DBZT

Overview

TMP235A4DBZT from Texas Instruments is a precision analog-output temperature sensor in a 3-pin SOT-23 package, delivering ±1°C typical accuracy over 0°C to +70°C and ±5°C maximum over –40°C to +150°C, with 10 mV/°C positive-slope output, 500 mV offset at 0°C, and 2.3 V to 5.5 V supply range - used for thermal monitoring in industrial power supplies and automotive control modules.

For engineers reviewing the TMP235A4DBZT datasheet, TMP235A4DBZT pinout, TMP235A4DBZT application, or TMP235A4DBZT equivalent, key selection criteria include its A4-level accuracy grade, low 9 µA quiescent current, strong 500 µA output drive capability, 1000 pF capacitive load tolerance, and compatibility with SAR ADC sample-and-hold inputs in battery-constrained or high-reliability systems.

Technical Context

The TMP235A4DBZT implements a CMOS-based linear analog temperature sensing architecture with a class-AB output driver optimized for direct interface to ADC input stages. Its piecewise-linear transfer function uses three temperature segments (–40°C to +100°C, +100°C to +125°C, +125°C to +150°C) to maintain accuracy across its full operating range.

It operates with no external components, requires no calibration, and features short-circuit protected output, line regulation of ±0.1°C/V, and thermal response time of 1.3 s (SC70) - though the DBZ package exhibits higher R_θJA (167°C/W) than SC70 (275°C/W), enabling tighter thermal coupling in compact PCB layouts.

Key Specifications

Pinout & Package

Package: 3-pin SOT-23 (DBZ), body size 2.92 mm × 1.30 mm, surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog-output temperature sensing applications.

Compared with TMP235A4DBZT, LMT86DBVR offers superior accuracy and lower voltage operation but requires board redesign due to SC70-5 footprint, while LM20CIM7/NOPB provides SOT-23 compatibility but sacrifices ±5°C max accuracy for ±2.5°C - making TMP235A4DBZT optimal for applications needing A4-grade precision in legacy SOT-23 layouts.

Availability

TMP235A4DBZT is available at Aetrix Electronics and suitable for industrial power supplies, automotive cabin controllers, and factory automation PLCs requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TMP235A4DBZT 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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.

The TMP23x product line was developed to deliver high-accuracy, low-power analog temperature sensing in standard surface-mount packages - specifically targeting cost-sensitive, space-constrained applications where thermistor calibration overhead or digital sensor complexity is undesirable.

FAQ

What is the operating temperature range of the TMP235A4DBZT?

The TMP235A4DBZT operates from –40°C to +150°C. Its accuracy specification is ±5°C maximum across this full range, with ±1°C typical accuracy maintained from 0°C to +70°C. This makes the TMP235A4DBZT suitable for under-hood automotive, industrial motor drives, and power converter thermal monitoring where extreme ambient conditions occur.

Does the TMP235A4DBZT require external calibration?

No, the TMP235A4DBZT does not require external calibration. It is factory-trimmed for accuracy and delivers its specified ±1°C typical (0°C to +70°C) and ±5°C maximum (–40°C to +150°C) performance without user adjustment. The device uses an internal piecewise-linear compensation algorithm to maintain linearity across temperature, eliminating need for lookup tables or polynomial correction in most applications.

Can the TMP235A4DBZT drive a 1000 pF capacitive load directly?

Yes, the TMP235A4DBZT is characterized to drive up to 1000 pF total capacitive load - including ADC sampling capacitance, multiplexer capacitance, and external filter capacitance - without oscillation or excessive settling delay. Its class-AB output stage delivers 500 µA maximum current, ensuring reliable settling within 800 µs to ±0.5°C accuracy even under full capacitive loading.

What is the supply voltage range for the TMP235A4DBZT?

The TMP235A4DBZT operates from 2.3 V to 5.5 V. This wide supply range allows direct connection to common rails including single-cell Li-ion (3.0–4.2 V), 3.3 V microcontroller domains, and legacy 5 V systems - without requiring voltage regulation. Line regulation is specified at ±0.1°C/V, meaning output temperature error shifts less than 0.1°C per volt change in VDD.

Is the TMP235A4DBZT pin-compatible with other TI temperature sensors?

Yes, the TMP235A4DBZT in SOT-23 (DBZ) package is footprint-compatible with TI's LMT8x-Q1 and LM20 series sensors. Pin 1 is VDD, pin 2 is VOUT, and pin 3 is GND - matching the same pinout and pad dimensions. This allows mechanical and layout reuse in existing designs, though electrical characteristics (gain, offset, accuracy) differ and firmware scaling must be verified.