Texas Instruments LM4132AMFX-3.3

Overview

LM4132AMFX-3.3 from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 3.3 V output with 0.05% initial accuracy, 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA quiescent current - used in high-resolution ADCs, battery-powered instrumentation, and automotive sensor signal conditioning.

For engineers reviewing the LM4132AMFX-3.3 datasheet, LM4132AMFX-3.3 pinout, LM4132AMFX-3.3 application, or LM4132AMFX-3.3 equivalent, this page provides verified specifications, SOT-23-5 package details, enable-controlled shutdown functionality, load regulation performance up to 20 mA, and validated alternative options for precision reference design.

Technical Context

The LM4132AMFX-3.3 implements a CMOS band-gap architecture with EEPROM-based curvature and tempco correction, enabling laser-trimmed-level accuracy without laser trimming. It operates as a series reference with internal error amplifier and pass element, supporting input voltages from 3.7 V (VREF + 400 mV) to 5.5 V.

Its enable pin (EN) controls transition between active mode (60 µA IQ) and shutdown mode (3 µA IQ), and it delivers full 20 mA output current without requiring an output capacitor - unlike most LDO references - making it suitable for space-constrained, low-power systems where stability with ceramic capacitors is critical.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, surface-mount, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3333AIDBVR and ADR3433ARJZ-R7, the LM4132AMFX-3.3 uniquely combines A-grade 0.05% accuracy, enable-controlled 3 µA shutdown, 20 mA drive, and capacitor-free stability - making it optimal for high-precision, space-constrained, and battery-sensitive designs where reference integrity cannot be compromised.

Availability

LM4132AMFX-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin electronics, and industrial analog I/O modules requiring stable component supply, long-term calibration retention, and AEC-Q100-compliant performance.

Supply support for LM4132AMFX-3.3 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 for high-accuracy, low-power reference applications in instrumentation, medical devices, and automotive systems - addressing the need for laser-trimmed performance in cost-effective CMOS packaging.

FAQ

What is the maximum load current supported by the LM4132AMFX-3.3?

The LM4132AMFX-3.3 supports up to 20 mA of continuous output current while maintaining specified accuracy and regulation. This allows direct driving of multiple ADC references, op-amp bias networks, or small logic loads without external buffering - a key advantage over many competing references limited to 5–10 mA.

Does the LM4132AMFX-3.3 require an output capacitor for stability?

No, the LM4132AMFX-3.3 is explicitly designed to be stable without an output capacitor, even under full 20 mA load. The datasheet confirms stability with only the required input capacitor (CIN). Adding COUT is optional and may slightly improve noise but is not necessary for loop stability - simplifying layout and reducing BOM count.

What is the minimum input voltage required for the LM4132AMFX-3.3 to regulate at 3.3 V?

The LM4132AMFX-3.3 requires a minimum input voltage of VREF + 400 mV = 3.7 V to maintain regulation within 0.5% of nominal output. At 10 mA load, the typical dropout is 175 mV, allowing operation down to 3.475 V - but 3.7 V is the guaranteed minimum across temperature and process variation per datasheet specifications.

How does the enable pin (EN) function on the LM4132AMFX-3.3?

The EN pin on the LM4132AMFX-3.3 is an active-high digital control input. When pulled ≥65% of VIN, the device operates normally (60 µA IQ). When pulled ≤35% of VIN, it enters shutdown mode drawing only 3 µA. No external pull-up/down is required; the pin has no internal bias and must be driven actively for reliable state control.

Is the LM4132AMFX-3.3 qualified for automotive applications?

The LM4132AMFX-3.3 is not the automotive-grade variant; it is the commercial version. For automotive use, TI specifies the LM4132QAMFX-3.3 (or LM4132-3.3-Q1), which is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), has enhanced ESD robustness (HBM ±2 kV), and undergoes additional reliability testing - the LM4132AMFX-3.3 lacks these qualifications.