Texas Instruments LM4132DMFX-1.8/NOPB

Overview

LM4132DMFX-1.8/NOPB from Texas Instruments is a precision low-dropout (LDO) voltage reference IC delivering a stable 1.8 V output with ±0.05% initial accuracy (A-grade), 10 ppm/°C temperature coefficient (0°C to 85°C), 60 µA supply current, and 230 mV dropout at 10 mA load. It operates from VIN = VREF + 400 mV to 5.5 V and supports shutdown via EN pin, enabling 3 µA quiescent current in disabled state - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4132DMFX-1.8/NOPB datasheet, LM4132DMFX-1.8/NOPB pinout, LM4132DMFX-1.8/NOPB application, or LM4132DMFX-1.8/NOPB equivalent, key selection criteria include guaranteed 1.8 V output stability over –40°C to +125°C, compatibility with low-ESR ceramic capacitors without mandatory output capacitance, and SOT-23-5 package suitability for space-constrained PCB layouts in battery-powered test equipment and automotive sensor modules.

Technical Context

The LM4132DMFX-1.8/NOPB implements a CMOS band-gap architecture with EEPROM-based curvature and tempco correction, enabling laser-trimmed reference performance in cost-effective plastic packaging. Its enable-controlled LDO topology eliminates need for external buffer amplifiers while supporting up to 20 mA output current.

Unlike shunt references, it draws only 60 µA quiescent current and maintains regulation down to 400 mV input-to-output differential, making it suitable for single-cell Li-ion (3.0–3.6 V) and dual-cell alkaline (2.4–3.2 V) systems where headroom and power efficiency are critical.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, 1.3 mm height; thermally enhanced for 164.1°C/W junction-to-ambient resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF3018AIDBZR and ADR3418ARJZ-R7, LM4132DMFX-1.8/NOPB uniquely combines A-grade 10 ppm/°C tempco, integrated enable, and 60 µA IQ in a pin-compatible SOT-23-5 footprint - enabling direct replacement where dynamic power control and minimal thermal drift are design-critical.

Availability

LM4132DMFX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor modules, and industrial process controllers requiring stable component supply with guaranteed long-term parametric consistency and AEC-Q100 compliance.

Supply support for LM4132DMFX-1.8/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 ICs and automotive-grade components.

The LM4132 family was designed to deliver laser-trimmed reference performance using cost-effective CMOS EEPROM trimming, targeting high-accuracy data acquisition, test equipment, and safety-critical automotive sensor interfaces.

FAQ

What is the maximum load current supported by the LM4132DMFX-1.8/NOPB?

The LM4132DMFX-1.8/NOPB delivers up to 20 mA output current while maintaining regulation within specified accuracy limits. This capability eliminates the need for external buffer amplifiers in most precision analog designs, including driving ADC reference inputs and low-power DACs. The device sustains this current across its full operating temperature range (–40°C to +125°C) with guaranteed dropout and load regulation performance.

Does the LM4132DMFX-1.8/NOPB require an output capacitor for stability?

No, the LM4132DMFX-1.8/NOPB is stable with low-ESR ceramic capacitors and does not require an output capacitor (COUT) for basic operation. A 1 µF input capacitor (CIN) is mandatory for transient immunity and PSRR optimization, but COUT is optional and used only to further reduce output noise or improve load transient response in sensitive applications.

What is the enable logic threshold for the LM4132DMFX-1.8/NOPB?

The LM4132DMFX-1.8/NOPB EN pin activates when voltage exceeds 65% of VIN and deactivates below 35% of VIN, providing hysteresis to prevent chatter near the switching threshold. For example, with VIN = 3.3 V, VIH(min) = 2.15 V and VIL(max) = 1.16 V. This rail-ratio behavior ensures robust enable control across varying input supply conditions without external level-shifting.

Is the LM4132DMFX-1.8/NOPB qualified for automotive applications?

Yes, the LM4132DMFX-1.8/NOPB is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), with verified HBM ESD rating of ±2000 V. It meets automotive reliability requirements for under-hood and cabin applications, including engine control sensors, battery management monitors, and ADAS subsystems requiring precision voltage references with long-term stability.

How does the LM4132DMFX-1.8/NOPB achieve 0.05% initial accuracy without laser trimming?

The LM4132DMFX-1.8/NOPB uses EEPROM registers to digitally correct curvature, temperature coefficient, and initial offset in its CMOS band-gap core - compensating for assembly-induced shifts in plastic SOT-23 packages. This post-package programming replaces laser trimming, achieving 0.05% accuracy at room temperature and 10 ppm/°C tempco over 0°C to 85°C without costly hybrid packaging or wafer-level trimming.