Texas Instruments LM4132AMFX-1.8/NOPB

Overview

LM4132AMFX-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, 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA quiescent current. It features an enable pin for 3 µA shutdown mode, supports up to 20 mA load current, and operates from VIN = VREF + 400 mV to 5.5 V - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4132AMFX-1.8/NOPB datasheet, LM4132AMFX-1.8/NOPB pinout, LM4132AMFX-1.8/NOPB application, or LM4132AMFX-1.8/NOPB equivalent, key selection criteria include dropout voltage at 10 mA (230 mV typ), line regulation (30 ppm/V), load regulation (25 ppm/mA), thermal hysteresis (75 ppm), and compatibility with low-ESR ceramic capacitors without requiring an output buffer.

Technical Context

The LM4132AMFX-1.8/NOPB uses EEPROM-trimmed CMOS band-gap architecture to achieve laser-trimmed bipolar-level accuracy while overcoming plastic-package assembly shifts. Its curvature correction and tempco calibration occur at package level, enabling A-grade performance (0.05%, 10 ppm/°C) in cost-effective SOT-23 packaging.

Unlike shunt references, it draws only 60 µA supply current and does not idle full-load current under no-load conditions. The integrated enable function allows fast transition between active (60 µA) and shutdown (3 µA) states, supporting battery-sensitive systems requiring dynamic power management.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin package, 2.90 mm × 1.60 mm body size, with exposed pad for thermal enhancement (R_θJA = 164.1°C/W).

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, the LM4132AMFX-1.8/NOPB uniquely combines A-grade accuracy, ultra-low IQ, enable-controlled shutdown, and automotive qualification in a single SOT-23-5 package - making it optimal for space-constrained, battery-aware, and safety-critical designs.

Availability

LM4132AMFX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and automotive sensor modules requiring stable component supply with guaranteed long-term availability and traceable lot control.

Supply support for LM4132AMFX-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 leader specializing in analog, embedded processing, and connectivity technologies with decades of precision reference design heritage.

The LM4132 family was engineered to deliver laser-trimmed bipolar reference performance using cost-effective, EEPROM-calibrated CMOS processes - targeting high-accuracy, low-power, and automotive-grade applications where stability and manufacturability are critical.

FAQ

What is the minimum input voltage required for stable operation of the LM4132AMFX-1.8/NOPB?

The LM4132AMFX-1.8/NOPB requires a minimum input voltage of VREF + 400 mV, i.e., 2.2 V, to maintain output regulation within 0.5% accuracy at 10 mA load. At lower inputs, dropout behavior begins, and output voltage drops proportionally. This 230 mV typical dropout enables use in single-cell Li-ion or two-cell alkaline systems.

Does the LM4132AMFX-1.8/NOPB require an output capacitor for stability?

No, the LM4132AMFX-1.8/NOPB is internally compensated and stable with low-ESR ceramic capacitors - including zero-output-capacitor configurations. While C_OUT is optional and improves transient response, it is not required for loop stability, simplifying layout and reducing BOM count compared to many competing references.

How does the enable pin of the LM4132AMFX-1.8/NOPB interface with standard logic levels?

The LM4132AMFX-1.8/NOPB enable pin accepts rail-to-rail input: VIH ≥ 65% of VIN enables the output, and VIL ≤ 35% of VIN places it in 3 µA shutdown. For a 3.3 V system, this translates to VIH ≥ 2.15 V and VIL ≤ 1.16 V - compatible with 3.3 V CMOS outputs without level-shifting.

Is the LM4132AMFX-1.8/NOPB suitable for automotive applications?

Yes - the LM4132AMFX-1.8/NOPB is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), with HBM ESD rating of ±2000 V. It meets automotive reliability and thermal stress requirements for engine control units, battery monitors, and ADAS sensor interfaces where precision and robustness are mandatory.

What is the long-term stability specification for the LM4132AMFX-1.8/NOPB?

The LM4132AMFX-1.8/NOPB exhibits ≤50 ppm change in output voltage after 1000 hours of operation at 25°C - equivalent to ±0.0009 V drift on a 1.8 V reference. This stability is measured under controlled conditions and supports applications requiring recalibration intervals exceeding five years.