Texas Instruments LMT90DBZT

Overview

LMT90DBZT from Texas Instruments is a precision analog centigrade temperature sensor in SOT-23-3 package, delivering 10 mV/°C linear output with 500 mV offset at 0°C, ±3°C max accuracy at 25°C, and operation from −40°C to +125°C on 4.5 V–10 V supply. It serves as a drop-in functional equivalent to LM50C in single-supply thermal monitoring circuits for battery management and consumer electronics.

For engineers reviewing the LMT90DBZT datasheet, LMT90DBZT pinout, LMT90DBZT application, or LMT90DBZT equivalent, key selection considerations include its industry-standard 10 mV/°C gain, low 95 µA quiescent current enabling <0.2°C self-heating, ±4°C full-range accuracy, 2 kΩ typical output impedance, and compatibility with high-capacitive loads without external buffering.

Technical Context

The LMT90DBZT uses a delta-V_BE sensing element buffered by a Class-A amplifier, producing a strictly linear analog voltage output governed by VO = (10 mV/°C × T) + 500 mV. Its output impedance ranges from 2 kΩ (typ) to 4 kΩ (max), with 1300 ppm/°C drift, enabling direct ADC interfacing across −40°C to +125°C.

No digital interface, calibration, or software linearization is required. The device operates exclusively in analog output mode, with no sleep, shutdown, or programmable features - its functionality is fully defined by its transfer function, thermal stability, and supply rejection (±1.2 mV/V line regulation).

Key Specifications

Pinout & Package

Package: SOT-23-3 (DBZ), 2.37 mm × 2.92 mm footprint, surface-mount, lead-free (NIPDAU/Sn), MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM50CDBZT and TMP235DBZR, the LMT90DBZT delivers optimal balance of drop-in replaceability, industrial temperature range, and cost-efficiency - retaining LM50C's pinout and transfer function while offering documented ±4°C full-range accuracy and proven integration in battery, printer, and PSU designs.

Availability

LMT90DBZT is available at Aetrix Electronics and suitable for battery management systems, consumer electronics thermal monitoring, and industrial power supply modules requiring stable component supply, long-lifecycle support, and consistent wafer-trimmed accuracy.

Supply support for LMT90DBZT 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and power management ICs.

The LMT90DBZT belongs to TI's centigrade temperature sensor product line, designed specifically to replace discrete thermistor networks with low-cost, calibrated, single-supply analog solutions for consumer, industrial, and computing applications.

FAQ

What is the output voltage range of the LMT90DBZT over its full operating temperature range?

The LMT90DBZT produces a linear analog output ranging from 100 mV at −40°C to 1.75 V at +125°C, following VO = (10 mV/°C × T) + 500 mV. This 1.65 V span simplifies interfacing with 12-bit or higher ADCs having 2.5 V or 3.3 V reference voltages, and eliminates the need for external amplification or level shifting in most implementations of the LMT90DBZT.

Does the LMT90DBZT require external calibration or trimming during system assembly?

No, the LMT90DBZT does not require external calibration or trimming. It undergoes wafer-level trimming to achieve ±3°C accuracy at 25°C and ±4°C over −40°C to +125°C, and its transfer function is fully characterized per Equation 1 in the datasheet. System-level calibration is optional and only needed for applications demanding sub-degree resolution beyond the LMT90DBZT's inherent accuracy.

Can the LMT90DBZT drive a 1 µF capacitor directly without oscillation or instability?

Yes, the LMT90DBZT can drive a 1 µF capacitor directly. With a maximum output impedance of 4 kΩ, it forms a 40 Hz low-pass filter with 1 µF, which does not significantly affect the device's thermal response time (dominated by package and mounting). TI confirms no decoupling is required for capacitive loads, and Figure 8-2 in the LMT90DBZT datasheet explicitly validates this capability.

How does self-heating affect measurement accuracy in the LMT90DBZT?

The LMT90DBZT's typical 95 µA quiescent current results in <0.2°C self-heating in still air, as confirmed in Section 8.5.3 and Figure 6-7 of the LMT90DBZT datasheet. This low self-heating preserves measurement fidelity when mounted on PCBs or metal surfaces, especially compared to higher-current alternatives - making the LMT90DBZT suitable for contact-based thermal monitoring where minimal thermal perturbation is critical.

Is the LMT90DBZT pin-compatible with the LM50CDBZT?

Yes, the LMT90DBZT is pin-compatible with the LM50CDBZT: both use the SOT-23-3 (DBZ) package with identical +VS, VO, and GND pin assignments and share the same 10 mV/°C gain and 500 mV offset. TI explicitly states "drop-in functional equivalent" in the LMT90DBZT datasheet Feature section, confirming mechanical and electrical interchangeability without PCB or firmware changes.