Texas Instruments LM4132BMFX-1.8

Overview

LM4132BMFX-1.8 from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 1.8 V output with ±0.1% initial accuracy (B grade), 10 ppm/°C temperature coefficient (0°C to 85°C), 60 µA supply current, and 230 mV dropout at 10 mA load - used in high-resolution ADCs, portable instrumentation, and battery-powered data acquisition systems.

For engineers reviewing the LM4132BMFX-1.8 datasheet, LM4132BMFX-1.8 pinout, LM4132BMFX-1.8 application, or LM4132BMFX-1.8 equivalent, key selection considerations include its enable-controlled shutdown (3 µA), SOT-23-5 package compatibility, 1.8 V output stability over –40°C to +125°C, and ability to drive up to 20 mA without external buffer or output capacitor.

Technical Context

The LM4132BMFX-1.8 implements a CMOS band-gap architecture with EEPROM-based curvature and tempco correction, enabling laser-trimmed-level precision in cost-effective plastic packaging. Its internal LDO regulator eliminates need for output capacitance while maintaining 0.5% output accuracy down to 230 mV input-to-output differential.

It features an active-high enable pin (VIH = 65% VIN, VIL = 35% VIN), supports input voltages from VREF + 400 mV (2.2 V) to 5.5 V, and delivers 20 mA output current with <25 ppm/mA load regulation and <30 ppm/V line regulation - critical for precision analog front-ends in automotive and industrial sensors.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6126AUT18+ and ADR3418ARJZ-R7, the LM4132BMFX-1.8 uniquely balances B-grade precision, enable-controlled ultra-low-power shutdown (3 µA), and capacitor-free operation - making it optimal for portable, intermittently powered, and space-constrained systems where both accuracy and energy efficiency are co-prioritized.

Availability

LM4132BMFX-1.8 is available at Aetrix Electronics and suitable for portable instrumentation, automotive sensor interfaces, and industrial process controllers requiring stable component supply with guaranteed long-term availability and traceable lot documentation.

Supply support for LM4132BMFX-1.8 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 analog ICs and automotive-qualified components.

The LM4132 family was designed to deliver laser-trimmed voltage reference performance using cost-effective CMOS + EEPROM trimming - targeting high-accuracy, low-power, and space-constrained applications in test equipment, medical devices, and automotive electronics.

FAQ

What is the maximum load current supported by the LM4132BMFX-1.8?

The LM4132BMFX-1.8 supports up to 20 mA of continuous output current while maintaining 0.5% output accuracy. This capability eliminates the need for external buffer amplifiers in most data acquisition and sensor interface designs. The device sustains this rating across its full operating temperature range (–40°C to +125°C) and remains stable with low-ESR ceramic capacitors on the input only.

Does the LM4132BMFX-1.8 require an output capacitor for stability?

No, the LM4132BMFX-1.8 is internally compensated and stable without an output capacitor - a key differentiator from many competing references. TI's datasheet explicitly states COUT is optional, and typical applications use only the required CIN (≥1 µF ceramic). This simplifies layout, reduces component count, and improves reliability in compact PCBs.

What is the enable pin behavior and voltage threshold for the LM4132BMFX-1.8?

The LM4132BMFX-1.8 features an active-high enable pin (EN) with VIH = 65% of VIN and VIL = 35% of VIN, ensuring robust noise immunity across input voltage variations. When EN is low, the device enters shutdown mode drawing only 3 µA. The enable function is fully specified from –40°C to +125°C and supports fast turn-on (<10 µs) for duty-cycled systems.

How does the LM4132BMFX-1.8 achieve 0.1% initial accuracy without laser trimming?

The LM4132BMFX-1.8 uses EEPROM registers to digitally correct curvature, temperature coefficient, and initial offset in its CMOS band-gap core - a technique that compensates for assembly-induced shifts in plastic SOT-23 packages. This architecture delivers B-grade (±0.1%) accuracy at wafer sort and final test, eliminating costly post-packaging laser trimming.

Is the LM4132BMFX-1.8 qualified for automotive applications?

The LM4132BMFX-1.8 itself is not AEC-Q100 qualified; however, the LM4132-Q1 variant (e.g., LM4132BQMF-1.8) is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient). For automotive designs requiring qualification, engineers should select the Q1 suffix version - the BMFX-1.8 is intended for industrial and portable applications where extended temperature operation is needed but formal automotive certification is not required.