Texas Instruments LMT84QDCKTQ1

Overview

LMT84QDCKTQ1 from Texas Instruments is an AEC-Q100 Grade 0 qualified analog-output CMOS temperature sensor with ±0.4°C typical accuracy, −5.5 mV/°C output gain, and 1.5-V to 5.5-V supply operation. It delivers linear, inverse-temperature voltage output (e.g., 1247 mV at −40°C, 419 mV at 110°C), features push-pull output with ±50 µA drive, and targets automotive powertrain and infotainment thermal monitoring where low quiescent current (5.4 µA) and fast power-on time (0.7 ms) are critical.

For engineers reviewing the LMT84QDCKTQ1 datasheet, LMT84QDCKTQ1 pinout, LMT84QDCKTQ1 application, or LMT84QDCKTQ1 equivalent, this page provides verified technical context, package mapping to SC70-5, confirmed pin functions, real-world accuracy behavior across −50°C to +150°C, and validated automotive-grade alternatives for thermal sensing in safety-critical embedded systems.

Technical Context

The LMT84QDCKTQ1 uses a forward-biased base-emitter junction as its sensing element, buffered by a rail-to-rail amplifier with push-pull output stage-enabling direct ADC interface without external buffering. Its transfer function follows a slight parabolic shape, accurately modeled by Equation 1 in TI's datasheet, with linearity maintained across full range via calibrated lookup table (Table 3).

Thermal response is enhanced by direct die attachment to GND pin, minimizing self-heating error (<0.015°C at 30°C ambient, 5.4 µA supply current). Output noise immunity is supported by supply-noise gain attenuation (measured per Figure 8) and optional bypass capacitance within 5 cm of VDD.

Key Specifications

Pinout & Package

Package: SC70-5 (SOT-5), 2.00 mm × 1.25 mm surface-mount footprint, AEC-Q100 qualified, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMT84QDCKTQ1, LMT85QDCKRQ1 offers 49% greater output slope for improved ADC resolution but raises minimum supply to 1.8 V, while LMT86QDCKRQ1 further increases slope to −10.9 mV/°C at 2.2 V minimum-both retain identical automotive qualification, package, and thermal performance.

Availability

LMT84QDCKTQ1 is available at Aetrix Electronics and suitable for automotive powertrain systems, infotainment thermal management, and drone battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LMT84QDCKTQ1 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 sensing and automotive-grade IC design.

The LMT8x-Q1 product line was engineered specifically for AEC-Q100-compliant automotive thermal monitoring-delivering high-accuracy, low-power, linear analog temperature sensing in compact SC70 packages for under-hood and cabin applications.

FAQ

What is the operating temperature range of the LMT84QDCKTQ1?

The LMT84QDCKTQ1 operates from −50°C to +150°C, with guaranteed ±2.7°C maximum accuracy across this full range and ±0.4°C typical accuracy over −50°C to +150°C at 2.3 V–5.5 V supply. This range meets AEC-Q100 Grade 0 requirements and supports under-hood automotive use cases such as engine coolant and transmission oil monitoring where extreme thermal exposure occurs.

Does the LMT84QDCKTQ1 require calibration for automotive applications?

No, the LMT84QDCKTQ1 does not require system-level calibration for automotive applications. Its ±2.7°C maximum accuracy over −50°C to +150°C is specified without calibration, and it is AEC-Q100 Grade 0 qualified. The device achieves this through factory-trimmed circuitry and a stable parabolic transfer function documented in Table 3 of the datasheet-making LMT84QDCKTQ1 suitable for production deployment in infotainment, cluster, and powertrain systems.

How does the LMT84QDCKTQ1 interface with an ADC?

The LMT84QDCKTQ1 interfaces directly with SAR ADC inputs using its ±50 µA push-pull output to charge sampling capacitors. For optimal performance, add a 1–10 nF CFILTER capacitor between OUT and GND near the ADC input to absorb instantaneous charge demand. The LMT84QDCKTQ1 supports capacitive loads up to 1100 pF without oscillation, eliminating need for external op-amp buffers in most microcontroller-based designs.

What is the supply current consumption of the LMT84QDCKTQ1 at 25°C?

The LMT84QDCKTQ1 draws 5.4 µA typical supply current at 25°C and 1.5 V–5.5 V supply, rising to 9 µA maximum across −50°C to +150°C. This ultra-low quiescent current enables battery-powered applications like drones and wireless sensor nodes to implement aggressive power cycling-achieving sub-microamp average current when sampled at low duty cycles-without sacrificing response speed (0.7 ms power-on time).

Is the LMT84QDCKTQ1 pin-compatible with the LM35 or LM20?

Yes, the LMT84QDCKTQ1 is footprint-compatible with the LM20 and LM35 temperature sensors in SC70-5 (DCK) package, sharing identical pinout: GND (Pins 1,2,5), OUT (Pin 3), and VDD (Pin 4). This allows direct mechanical replacement in existing layouts. However, note that LMT84QDCKTQ1 outputs an inverse voltage (decreasing with temperature) versus LM35's positive slope-firmware or signal conditioning must account for polarity difference when substituting LMT84QDCKTQ1.