Texas Instruments LMT70AYFQT

Overview

LMT70AYFQT from Texas Instruments is a ±0.05°C (typ) precision analog-output temperature sensor in a 0.88 mm × 0.88 mm 4-bump WLCSP (DSBGA) package, featuring an output enable pin (T_ON), NTC-like slope of −5.19 mV/°C, and operation from −55°C to +150°C. It replaces RTDs and precision NTC thermistors in battery-powered medical thermometers and IoT sensor nodes.

For engineers reviewing the LMT70AYFQT datasheet, LMT70AYFQT pinout, LMT70AYFQT application, or LMT70AYFQT equivalent, this page delivers verified accuracy specs, TAO output behavior, thermal matching capability for adjacent units, supply current down to 9.2 µA, and real-world ADC interface guidance - all confirmed for the exact LMT70AYFQT variant.

Technical Context

The LMT70AYFQT integrates stacked BJT base-emitter junctions as its sensing element, biased by a current source and buffered by a precision amplifier with a class-AB push-pull output stage. Its TAO pin delivers low-impedance analog voltage (e.g., 943.227 mV at 30°C) with ±0.05°C typical accuracy from 20°C to 42°C and ±0.2°C max across −20°C to 90°C.

T_ON is a digital input controlling TAO's output state: logic high enables the analog output; logic low places TAO in high-impedance mode. This allows multiplexing multiple LMT70AYFQT sensors onto a single ADC channel without external switches, reducing system cost and calibration complexity.

Key Specifications

Pinout & Package

Package: 0.88 mm × 0.88 mm, 4-bump DSBGA (WLCSP), YFQ designation. Bottom-side solder balls; no exposed pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX31820MUA+ and LM75BIMM/NOPB, the LMT70AYFQT uniquely delivers ±0.05°C analog accuracy in a 0.88 mm × 0.88 mm package with hardware-controlled output enable and factory-matched pairs - making it the only choice for miniaturized, high-precision, low-power analog temperature sensing where ADC resource sharing or differential ΔT measurement is required.

Availability

LMT70AYFQT is available at Aetrix Electronics and suitable for medical thermometer design, IoT edge-node development, and industrial RTD replacement projects requiring stable component supply and long-term production continuity.

Supply support for LMT70AYFQT 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 low-power design.

The LMT70AYFQT belongs to TI's high-accuracy analog temperature sensor product line, engineered specifically for applications demanding clinical-grade thermal measurement in ultra-small, battery-efficient form factors - including wearables, portable diagnostics, and smart energy systems.

FAQ

What is the guaranteed accuracy specification for LMT70AYFQT across its full operating range?

The LMT70AYFQT guarantees ±0.36°C maximum accuracy from −55°C to +150°C. Within narrower ranges, tighter specifications apply: ±0.05°C typical (±0.13°C max) from 20°C to 42°C; ±0.2°C max from −20°C to 90°C; and ±0.23°C max from 90°C to 110°C. These values are measured at VDD = 2.7 V and assume no DC load on TAO.

How does the T_ON pin function on the LMT70AYFQT, and what are its voltage thresholds?

The T_ON pin on the LMT70AYFQT is an active-high digital input that controls TAO output state. Logic high (≥0.66×VDD or ≥VDD−0.5 V) enables the analog output; logic low (≤0.33×VDD or ≤0.5 V) disables it, placing TAO in high-impedance mode. Input current remains below ±1 µA across −55°C to +150°C, ensuring minimal loading on driving GPIOs.

Can LMT70AYFQT replace a Pt100 RTD in a 2-wire configuration, and what interface changes are needed?

Yes - the LMT70AYFQT can replace a 2-wire Pt100 RTD in many applications. Unlike RTDs requiring excitation current and ratiometric ADC measurement, the LMT70AYFQT provides a direct analog voltage output (e.g., 943 mV at 30°C) referenced to GND. No excitation circuitry or 4-wire compensation is needed; simply connect TAO to an ADC input and configure for single-ended measurement with appropriate gain scaling.

What is the meaning of "adjacent matching" for LMT70AYFQT, and how is it implemented in production?

"Adjacent matching" for LMT70AYFQT means two units picked from consecutive positions on the same tape-and-reel achieve ≤0.1°C output mismatch at 30°C. This is achieved through TI's binning process during final test. To maintain this spec, both units must remain traceable to original adjacent positions; rework requires replacing the matched pair - not just one device - as individual unit traceability is not supported due to WLCSP size.

Does LMT70AYFQT require external calibration to achieve its ±0.05°C typical accuracy?

No - the ±0.05°C typical accuracy of the LMT70AYFQT is delivered as-tested and does not require end-user calibration. It is specified relative to TI's Electrical Characteristics Temperature Lookup Table (LUT) at VDD = 2.7 V. For highest accuracy, TI recommends using the LUT with linear interpolation over ≤10°C intervals or applying the provided second/third-order transfer functions.