Texas Instruments LMT87DCKR

Overview

LMT87DCKR from Texas Instruments is a precision analog-output CMOS temperature sensor with ±0.4°C typical accuracy, −50°C to +150°C operating range, and −13.6 mV/°C output slope. It delivers linear, inverse-temperature voltage output in a 5-pin SC70 (SOT-5) surface-mount package, optimized for low-power battery-operated systems such as drone thermal monitoring and automotive infotainment ambient sensing.

For engineers reviewing the LMT87DCKR datasheet, LMT87DCKR pinout, LMT87DCKR application, or LMT87DCKR equivalent, this page provides verified functional identity, validated SC70 package mapping, confirmed push-pull output drive capability (±50 µA), exact thermal time constant (0.7 ms power-on), and real-world substitution guidance against comparable TI LMT8x family members.

Technical Context

The LMT87DCKR implements a forward-biased base-emitter junction as its core sensing element, buffered by a rail-to-rail CMOS amplifier with push-pull output stage-enabling direct ADC interface without external buffering. Its transfer function follows a slight parabolic curve (−13.6 mV/°C nominal slope, with ±0.00433 mV/°C² curvature term), accurately modeled in Table 3 of the datasheet across −50°C to +150°C.

It operates from 2.7 V to 5.5 V with only 5.4 µA quiescent current and 0.7 ms power-on time, supporting aggressive power-cycling architectures. The SC70 package's GND pin is thermally connected to the die backside, enabling accurate thermal coupling when mounted on PCBs with thermal vias or copper pours.

Key Specifications

Pinout & Package

Package: SC70-5 (SOT-5), 2.00 mm × 1.25 mm surface-mount footprint, thermally enhanced with GND pin tied to die backside.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMT87DCKR, LMT86DCKR offers greater supply flexibility at lower sensitivity, while LMT84DCKR enables 1.5 V operation but sacrifices resolution-making LMT87DCKR optimal for battery-powered applications requiring both high sensitivity and 2.7 V minimum supply.

Availability

LMT87DCKR is available at Aetrix Electronics and suitable for automotive infotainment, industrial motor control, and drone thermal management requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LMT87DCKR 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 and embedded processing technologies, with decades of expertise in precision sensing, power management, and signal chain solutions.

The LMT87DCKR belongs to TI's LMT8x analog temperature sensor family, designed specifically for cost-sensitive, low-power, high-accuracy thermal monitoring in automotive, industrial, and consumer applications where digital interfaces add unnecessary complexity.

FAQ

What is the absolute maximum supply voltage for LMT87DCKR?

The absolute maximum supply voltage for LMT87DCKR is 6 V, per Section 7.1 of the SNIS170E datasheet. Operation above 5.5 V violates recommended conditions and risks permanent damage. For robust design, maintain VDD between 2.7 V and 5.5 V, with local 100 nF ceramic bypassing at the VDD pins.

Does LMT87DCKR require external calibration for ±0.4°C accuracy?

No, LMT87DCKR achieves ±0.4°C typical accuracy over 20°C–40°C without external calibration. This specification is factory-trimmed and guaranteed across process, voltage, and temperature. The transfer table (Table 3) and parabolic equation in the datasheet provide traceable reference data for system-level compensation if needed.

Can LMT87DCKR drive an ADC input directly without a buffer op-amp?

Yes, LMT87DCKR can directly drive most SAR ADC inputs due to its ±50 µA push-pull output and stability with ≤1100 pF capacitive loads. Its 0.7 ms power-on time and monotonic output ensure reliable sampling. For ADCs with >1100 pF input capacitance, add a series resistor per Table 4 in the datasheet.

How does the SC70 package of LMT87DCKR affect thermal response?

The SC70 package of LMT87DCKR has faster electrical response (0.7 ms) than mechanical thermal response. Its thermal time constant depends on PCB layout: with thermal vias and copper pour under the GND pad, it achieves ~10–20 s in still air. For faster thermal tracking, mount near heat sources with minimal thermal mass between sensor and target.

Is LMT87DCKR qualified for automotive applications?

LMT87DCKR itself is not AEC-Q100 qualified; however, the pin-compatible LMT87DCKR-Q1 variant is automotive-grade. The LMT87DCKR shares identical electrical specs and SC70 packaging, making it suitable for non-safety-critical automotive subsystems like infotainment ambient sensing-provided system-level qualification is performed per ISO 16750.