Texas Instruments LM4132AMFX-4.1

Overview

LM4132AMFX-4.1 from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 4.096 V output with ±0.05% initial accuracy, 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA supply current. It operates from VIN = VREF + 400 mV up to 5.5 V and supports up to 20 mA load current - used in high-resolution ADC/DAC biasing, portable instrumentation, and automotive sensor signal conditioning.

For engineers reviewing the LM4132AMFX-4.1 datasheet, LM4132AMFX-4.1 pinout, LM4132AMFX-4.1 application, or LM4132AMFX-4.1 equivalent, key selection criteria include its A-grade accuracy, SOT-23-5 package compatibility, enable-controlled shutdown (3 µA), dropout performance at 175 mV (10 mA), and stability with ceramic capacitors without requiring an output buffer.

Technical Context

The LM4132AMFX-4.1 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 pin provides digital on/off control, and internal design eliminates need for output capacitance or external buffers.

This device functions as a series-connected, three-terminal precision reference: input (VIN), ground (GND), enable (EN), and output (VREF). It achieves 0.5% accuracy retention down to 175 mV dropout at 10 mA and maintains long-term stability of ≤50 ppm over 1000 hours.

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, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4132AMFX-4.1, REF3440IDBVR offers superior temperature stability but lacks enable control and demands an output capacitor, increasing BOM and layout complexity; ADR3440ARJZ-R7 trades 0.05% accuracy for broader availability and similar enable functionality but doubles supply current - making LM4132AMFX-4.1 optimal for power-sensitive, high-accuracy, capacitor-free designs.

Availability

LM4132AMFX-4.1 is available at Aetrix Electronics and suitable for high-precision data acquisition systems, automotive sensor modules, and industrial process controllers requiring stable component supply with guaranteed long-term continuity.

Supply support for LM4132AMFX-4.1 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-grade components.

The LM4132 family was designed to deliver laser-trimmed reference performance using programmable CMOS technology - targeting cost-sensitive, space-constrained applications in instrumentation, automotive, and industrial automation where accuracy, stability, and low power are critical.

FAQ

What is the maximum input voltage for LM4132AMFX-4.1?

The absolute maximum input voltage for LM4132AMFX-4.1 is 6 V, but the recommended operating maximum is 5.5 V. Operation above VREF + 400 mV (i.e., ≥4.496 V) is required for regulation; exceeding 5.5 V risks permanent damage per Absolute Maximum Ratings. Always use a minimum 1 µF ceramic input capacitor (CIN) between VIN and GND.

Does LM4132AMFX-4.1 require an output capacitor?

No, LM4132AMFX-4.1 is explicitly designed to be stable without an output capacitor - a key differentiator from most competing references. The datasheet states COUT is optional and only recommended for specific noise-reduction scenarios. Adding COUT may improve low-frequency noise but is not needed for stability or basic regulation.

What does the 'MFX' suffix indicate in LM4132AMFX-4.1?

The 'MFX' suffix denotes the SOT-23-5 (DBV) package with tape-and-reel delivery and commercial temperature range (–40°C to +125°C ambient). The 'A' prefix indicates A-grade accuracy (±0.05%), and '-4.1' specifies the 4.096 V output voltage option - consistent with TI's standardized naming for the LM4132 family.

Can LM4132AMFX-4.1 drive a 10 kΩ load directly?

Yes. With a 4.096 V output and maximum 20 mA output current, LM4132AMFX-4.1 can directly drive a minimum load resistance of 204.8 Ω (4.096 V / 20 mA). A 10 kΩ load draws only 409.6 µA - well within specification - and introduces negligible error (<0.01% load regulation shift) given its 25 ppm/mA spec.

Is LM4132AMFX-4.1 qualified for automotive applications?

Yes - LM4132AMFX-4.1 is part of the LM4132-Q1 qualified family and meets AEC-Q100 Grade 1 requirements (–40°C to +125°C ambient), including HBM ESD Level 2 (±2000 V). While the 'Q1' suffix appears on automotive-grade orderables, the LM4132AMFX-4.1 shares identical die, test flow, and qualification data per TI's documentation.