Texas Instruments LM94023BITMX/NOPB

Overview

LM94023BITMX/NOPB from Texas Instruments is a precision analog-output CMOS temperature sensor with dual-gain selection (−5.5 mV/°C or −8.2 mV/°C), 1.5V minimum supply operation, ±50 µA push-pull output drive, and ±1.5°C accuracy from −20°C to +40°C - deployed in battery-powered wireless transceivers and automotive cabin temperature monitoring.

For engineers reviewing the LM94023BITMX/NOPB datasheet, LM94023BITMX/NOPB pinout, LM94023BITMX/NOPB application, or LM94023BITMX/NOPB equivalent, key selection criteria include gain-selectable sensitivity, ultra-low quiescent current (5.4 µA typ), DSBGA-4 package footprint compatibility with LM20, and short-circuit protected class-AB output for direct ADC sampling without external buffers.

Technical Context

The LM94023BITMX/NOPB implements a rail-to-rail class-AB analog output stage enabling bidirectional ±50 µA drive into capacitive loads up to 1100 pF - critical for transient-heavy SAR ADC input charging. Its dual-gain architecture uses a single logic-level GS pin to select between −5.5 mV/°C (GS = 0) and −8.2 mV/°C (GS = 1), with defined VIH/VIL thresholds (VDD−0.5V / 0.5V) and sub-1 µA input leakage.

Thermal sensing relies on die-to-GND thermal conduction via the exposed backside of the DSBGA package (θJA = 122.6°C/W), and its transfer function exhibits slight parabolic nonlinearity - fully characterized in the 151-point LM94023 Transfer Table for lookup-based compensation. Accuracy limits exclude load regulation but include line regulation and output voltage shift effects.

Key Specifications

Pinout & Package

LM94023BITMX/NOPB uses a 0.8 mm × 0.8 mm, 4-bump DSBGA package (TI package code YFQ0004), with GND and VDD on opposite corners and GS/VOUT on the remaining corners - optimized for minimal board area and thermal coupling to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM20YDSET/NOPB and MAX6610ASA+, the LM94023BITMX/NOPB uniquely supports 1.5V operation and runtime gain switching - enabling adaptive resolution in battery-constrained systems where supply headroom and diagnostic flexibility are critical.

Availability

LM94023BITMX/NOPB is available at Aetrix Electronics and suitable for cell phone thermal management, automotive cabin sensing, and battery pack safety monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM94023BITMX/NOPB 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 signal chains and low-power sensor interfaces.

The LM94023BITMX/NOPB belongs to TI's precision analog temperature sensor product line, designed specifically for ultra-low-voltage, high-accuracy thermal monitoring in space-constrained portable and automotive electronics.

FAQ

What is the minimum supply voltage required for reliable operation of the LM94023BITMX/NOPB?

The LM94023BITMX/NOPB operates reliably down to 1.5 V across its full −50°C to +150°C temperature range when configured in the lower-gain mode (GS = 0). At 1.5 V, it maintains ±2.7°C accuracy over the entire range and delivers full functionality including push-pull output drive and gain-select logic interface - making it suitable for single-cell lithium or alkaline battery systems.

How does the Gain Select (GS) pin affect the LM94023BITMX/NOPB's output voltage vs. temperature relationship?

The GS pin selects between two calibrated slopes: −5.5 mV/°C (GS = 0) or −8.2 mV/°C (GS = 1). This changes the output voltage span - e.g., at 25°C, VOUT is ~900 mV (GS=0) or ~1350 mV (GS=1). The LM94023BITMX/NOPB Transfer Table provides exact mV values per °C for both modes, enabling precise lookup-based temperature calculation without interpolation errors.

Can the LM94023BITMX/NOPB drive an ADC input directly without external components?

Yes - the LM94023BITMX/NOPB's ±50 µA class-AB push-pull output can directly drive typical microcontroller SAR ADC sample capacitors (1–10 pF) with ≤1.9 ms power-on time. No series resistor or op-amp buffer is required if load capacitance stays ≤1100 pF and trace lengths are short. For larger capacitive loads, a series resistor (e.g., 800 Ω for 1 µF) restores stability per Figure 14 in the datasheet.

What is the thermal resistance (θJA) of the LM94023BITMX/NOPB, and how does it impact measurement accuracy?

The LM94023BITMX/NOPB has a θJA of 122.6°C/W in still air. Self-heating error is calculated as TJ = TA + θJA × (VDD × IQ + (VDD − VOUT) × IL). With 5.4 µA quiescent current and 2 µA load, self-heating remains <0.02°C - negligible for most applications. Accurate measurement requires mounting the GND pin to a thermally conductive plane, as the die backside is bonded directly to that terminal.

Is the LM94023BITMX/NOPB pin-compatible with the LM20 temperature sensor?

Yes - the LM94023BITMX/NOPB uses the same DSBGA-4 footprint (0.8 mm × 0.8 mm, YFQ0004) and identical pinout (GND/A2, GS/A1, VOUT/B1, VDD/B2) as the LM20YDSET/NOPB. This allows direct mechanical replacement in existing layouts, though electrical differences (gain select, 1.5V operation, improved accuracy) require firmware or schematic validation for full functional equivalence.