Texas Instruments LMT88DCKT

Overview

LMT88DCKT from Texas Instruments is a precision analog-output CMOS temperature sensor operating from −55°C to 130°C at 2.4 V–5.5 V supply, delivering ±1.5°C accuracy at 30°C with a parabolic transfer function VO = (−3.88×10⁻⁶×T²) + (−1.15×10⁻²×T) + 1.8639 V, and quiescent current <10 µA - used for direct connection to MCU ADC inputs in battery-powered thermal monitoring.

For engineers reviewing the LMT88DCKT datasheet, LMT88DCKT pinout, LMT88DCKT application, or LMT88DCKT equivalent, this page delivers verified package mapping (SC-70-5), terminal functions, curvature-compensated voltage output behavior, self-heating <0.02°C, and real-world interface guidance for sampling ADCs and noisy environments.

Technical Context

The LMT88DCKT implements a forward-biased base-emitter junction as its sensing element, buffered by a Class-A output amplifier that sources up to 16 µA and sinks 1 µA. Its output impedance is ≤160 Ω across −55°C to 130°C, enabling direct drive of high-impedance ADC inputs without external buffering.

It operates in a single functional mode: analog voltage output inversely proportional to temperature, with predictable parabolic curvature optimized for software linearization. No digital interface, configuration registers, or shutdown control lines are present - power gating is achieved externally via V+ control.

Key Specifications

Pinout & Package

Package: SC-70-5 (DCK), body size 2.00 mm × 1.25 mm, thermally enhanced with exposed die attach paddle connected to Pin 2 (GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMT88DCKT, LMT87DCKT offers superior sensitivity and accuracy but demands revised calibration and signal chain scaling, while LM73CIMK-0 replaces analog design complexity with digital integration - neither is pin-compatible, and both require PCB layout and firmware changes.

Availability

LMT88DCKT is available at Aetrix Electronics and suitable for industrial motor control, HVAC system monitoring, and automotive cabin climate applications requiring stable component supply despite its TI-obsolete status.

Supply support for LMT88DCKT 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 and low-power IC design.

The LMT88DCKT belongs to TI's LMT analog temperature sensor family, engineered for cost-sensitive, battery-operated systems where simplicity, ultra-low power, and direct ADC interfacing are prioritized over digital features.

FAQ

What is the operating temperature range of the LMT88DCKT, and how does supply voltage affect it?

The LMT88DCKT operates from −55°C to 130°C when supplied with 2.7 V to 5.5 V. At 2.4 V supply, the lower limit shifts to −30°C while the upper limit remains 130°C. This voltage-dependent range is explicitly defined in the datasheet's Recommended Operating Conditions table and must be accounted for in low-voltage battery designs. The LMT88DCKT's transfer function remains valid across the active range.

Can the LMT88DCKT be directly connected to a microcontroller's ADC input without external components?

Yes - the LMT88DCKT's ≤160 Ω output impedance and ability to drive up to 300 pF make it compatible with most SAR and delta-sigma ADC inputs without a buffer amplifier. For best results, place a 0.1 µF bypass capacitor between V+ and GND, and route VO with minimal trace length. The LMT88DCKT's output voltage spans ~0.3 V to 2.5 V across its full range, fitting standard 3.3 V ADC references.

Is the LMT88DCKT pin-compatible with other devices in the LMT family, such as LMT84 or LMT86?

No - the LMT88DCKT uses a 5-pin SC-70 (DCK) package with NC, GND, VO, V+, GND pinout, while LMT84/LMT86 use 6-pin SOT-23 packages with different pin assignments (e.g., LMT84 has V+, GND, VO, NC, NC, NC). Substituting requires PCB redesign. The LMT88DCKT's unique pin 1 (NC) and dual-GND configuration are not shared across the family.

How is temperature calculated from the LMT88DCKT's analog output voltage?

Temperature is derived using the parabolic equation VO = (−3.88×10⁻⁶×T²) + (−1.15×10⁻²×T) + 1.8639 V. Solving for T yields T = [−(−1.15×10⁻²) ± √((−1.15×10⁻²)² − 4×(−3.88×10⁻⁶)×(1.8639 − VO))]/(2×(−3.88×10⁻⁶)). Precomputed lookup tables or second-order polynomial firmware routines are recommended. The LMT88DCKT's datasheet provides a full voltage-vs.-temperature table for verification.

Why is the LMT88DCKT marked as Obsolete by Texas Instruments, and is it still supported for new designs?

Texas Instruments lists LMT88DCKT as Obsolete in its packaging addendum, meaning no new production lots are planned. However, Aetrix Electronics maintains active inventory with full traceability and provides lifecycle coordination support. The LMT88DCKT remains technically viable for legacy refreshes and cost-sensitive analog-sensor applications where its performance, package, and supply characteristics meet requirements - no functional replacement has identical pinout and transfer function.