Texas Instruments TMP235A2DBZT

Overview

TMP235A2DBZT from Texas Instruments is a precision analog-output temperature sensor in a 3-pin SOT-23 package, delivering ±0.5°C typical accuracy from –40°C to +150°C, 10 mV/°C gain, and 500 mV output at 0°C. It operates from 2.3 V to 5.5 V supply, draws only 9 µA quiescent current, and drives up to 1000 pF capacitive loads-ideal for battery-powered industrial temperature monitoring.

For engineers reviewing the TMP235A2DBZT datasheet, TMP235A2DBZT pinout, TMP235A2DBZT application, or TMP235A2DBZT equivalent, this page delivers verified electrical characteristics, thermal performance data, ADC interface guidance, and validated alternative options for analog temperature sensing in constrained-space designs.

Technical Context

The TMP235A2DBZT implements a CMOS-based linear analog temperature transducer with piecewise-linear calibration across three temperature segments (–40°C to +100°C, +100°C to +125°C, +125°C to +150°C) to maintain ±0.5°C typical accuracy over its full operating range. Its class-AB output driver enables direct connection to SAR ADC sample-and-hold inputs without external buffering.

It uses a fixed 500 mV offset at 0°C and 10 mV/°C nominal slope, with line regulation of ±0.1 °C/V and load regulation under ±0.1 °C at 100 µA-enabling stable analog readings even under varying supply and capacitive loading conditions typical in embedded measurement systems.

Key Specifications

Pinout & Package

Package: 3-pin SOT-23 (DBZ), body size 2.92 mm × 1.30 mm, surface-mount, RoHS-compliant, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMT87DBVR and LM20BIM8, TMP235A2DBZT delivers superior ±0.5°C typical accuracy and ultra-low 9 µA supply current in a compact 3-pin SOT-23, making it optimal for next-generation industrial and automotive thermal sensing where precision and power efficiency are co-prioritized.

Availability

TMP235A2DBZT is available at Aetrix Electronics and suitable for industrial motor control, automotive cabin sensing, grid-scale power electronics, and portable test equipment requiring stable component supply and long-term lifecycle support.

Supply support for TMP235A2DBZT 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 sensing, power management, and signal chain solutions.

The TMP23x product line was designed specifically for high-accuracy, low-power analog temperature measurement in space-constrained industrial, automotive, and infrastructure applications-replacing thermistors with integrated CMOS sensor ICs.

FAQ

What is the operating temperature range of the TMP235A2DBZT?

The TMP235A2DBZT operates from –40°C to +150°C with ±0.5°C typical accuracy across this full range. Its piecewise-linear calibration ensures consistent performance up to 150°C, validated per TI SBOS857E datasheet Section 6.5. The device maintains specified accuracy without external compensation, making it suitable for under-hood automotive and industrial power electronics applications where extreme thermal margins are required. TMP235A2DBZT achieves this using segmented gain and offset parameters defined in Table 1 of the datasheet.

Does the TMP235A2DBZT require external components for basic operation?

No, the TMP235A2DBZT requires only a 0.1 µF ceramic bypass capacitor between VDD and GND for stable operation. Unlike many analog sensors, it does not need external resistors, op-amps, or trimming components. Its class-AB output driver directly drives capacitive loads up to 1000 pF-sufficient for most SAR ADC inputs-including sampling capacitance, multiplexer capacitance, and optional filtering caps. This simplifies design and reduces BOM count while maintaining ±0.5°C accuracy. TMP235A2DBZT's internal architecture eliminates the need for external calibration or signal conditioning.

How does the TMP235A2DBZT interface with an ADC?

The TMP235A2DBZT interfaces directly with SAR ADC inputs using its robust 500 µA output drive and low 20 Ω output impedance at 100 Hz. TI recommends adding a 680 pF CFILTER capacitor between VOUT and GND to absorb instantaneous charge demand during ADC sampling, keeping total CLOAD ≤1000 pF. An optional 100 Ω RFILTER may be added in series for additional noise rejection. This configuration ensures minimal sampling error and preserves the ±0.5°C accuracy of TMP235A2DBZT without requiring buffer amplifiers or complex layout constraints.

Is the TMP235A2DBZT pin-compatible with other temperature sensors?

Yes, the TMP235A2DBZT is footprint-compatible with industry-standard LMT8x-Q1 and LM20 temperature sensors in the same SOT-23 (DBZ) package. Pin 1 is VDD, Pin 2 is VOUT, and Pin 3 is GND-identical to LM20BIM8 and LMT87DBVR. However, note that LM20BIM8 has two NC pins (Pins 4–5), so only the 3-pin variant mapping applies. This mechanical compatibility enables drop-in replacement in legacy designs, though electrical differences (e.g., accuracy, gain, supply range) must be verified. TMP235A2DBZT retains identical solder pad dimensions and thermal vias requirements.

What is the self-heating effect of the TMP235A2DBZT in typical PCB layouts?

In a standard JEDEC High-K board with thermal vias, the TMP235A2DBZT exhibits a junction-to-board thermal resistance (RθJB) of 146 °C/W. At its 9 µA typical supply current and 2.3 V minimum supply, power dissipation is ~21 µW-resulting in <0.003°C self-heating. Even under worst-case 5.5 V operation (50 µW), self-heating remains below 0.008°C. This negligible thermal rise ensures measurement fidelity in static-air environments and makes TMP235A2DBZT suitable for high-accuracy applications where sensor self-warming would otherwise corrupt readings.