Texas Instruments LM4132BMFX-3.3/NOPB

Overview

LM4132BMFX-3.3/NOPB from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 3.3 V output with 0.1% initial accuracy (B-grade), 10 ppm/°C temperature coefficient (0°C to 85°C), 60 µA supply current, and 20 mA output drive capability. It operates from VIN = VREF + 400 mV up to 5.5 V and features an enable pin for 3 µA shutdown mode - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4132BMFX-3.3/NOPB datasheet, LM4132BMFX-3.3/NOPB pinout, LM4132BMFX-3.3/NOPB application, or LM4132BMFX-3.3/NOPB equivalent, key selection criteria include dropout voltage at 10 mA (175 mV), load regulation (25 ppm/mA), line regulation (85 ppm/V), long-term stability (50 ppm over 1000 hrs), and SOT-23-5 package compatibility with low-ESR ceramic capacitors.

Technical Context

The LM4132BMFX-3.3/NOPB uses EEPROM-trimmed CMOS bandgap architecture to achieve laser-trimmed bipolar-level precision without requiring external buffer amplifiers or output capacitors. Its curvature correction and tempco compensation are programmed at package level to counteract assembly-induced shifts.

It implements a series topology with active enable control, supporting direct connection to precision analog signal chains. The device maintains 0.5% output accuracy down to 400 mV input-to-output differential and delivers stable 3.3 V reference under load currents from 0 to 20 mA across –40°C to +125°C ambient.

Key Specifications

Pinout & Package

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

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 LM4132BMFX-3.3/NOPB uniquely balances 20 mA drive capability, 60 µA IQ, and 175 mV dropout - making it optimal for mixed-signal systems needing both precision and moderate load delivery without external buffering.

Availability

LM4132BMFX-3.3/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC analog I/O modules, medical patient monitoring devices, and automotive battery management systems requiring stable component supply and long-term calibration integrity.

Supply support for LM4132BMFX-3.3/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 industrial-grade components.

The LM4132 family was designed to deliver laser-trimmed voltage reference performance using cost-effective, EEPROM-programmable CMOS processes - targeting high-accuracy data acquisition, test equipment, and automotive sensor interfaces where stability and low dropout are critical.

FAQ

What is the maximum load current supported by the LM4132BMFX-3.3/NOPB?

The LM4132BMFX-3.3/NOPB 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 precision DAC and ADC reference applications. The device sustains this performance across its full operating temperature range (–40°C to +125°C) and input voltage range (3.7 V to 5.5 V). Exceeding 20 mA may cause output voltage deviation beyond specification limits.

Does the LM4132BMFX-3.3/NOPB require an output capacitor (COUT) for stability?

No, the LM4132BMFX-3.3/NOPB is internally compensated and stable without an output capacitor. A 10 nF ceramic capacitor (COUT) may be added to improve power supply rejection ratio (PSRR) above 10 kHz, but it is optional. Only the input capacitor (CIN ≥1 µF ceramic) is mandatory per the datasheet. This simplifies layout and reduces BOM count compared to many competing references that mandate COUT for phase margin.

What is the dropout voltage specification for the LM4132BMFX-3.3/NOPB at 10 mA load?

The dropout voltage for the LM4132BMFX-3.3/NOPB is 175 mV at 10 mA load and 25°C, defined as the minimum VIN − VREF differential required to maintain output accuracy within 0.5% of nominal 3.3 V. At worst-case temperature (–40°C to +125°C), dropout increases to 400 mV. This low dropout enables operation from single-cell Li-ion (3.0–3.6 V) or regulated 3.3 V rails with minimal headroom.

How does the enable (EN) pin function on the LM4132BMFX-3.3/NOPB?

The EN pin on the LM4132BMFX-3.3/NOPB is an active-high digital control input. When pulled to ≥65% of VIN, the device operates normally; when held ≤35% of VIN, it enters shutdown mode drawing only 3 µA. The pin has no internal pull-up/down and must be driven externally. Transition time from shutdown to active is typically <1 µs, supporting fast wake-up in duty-cycled measurement systems.

Is the LM4132BMFX-3.3/NOPB suitable for automotive applications?

The LM4132BMFX-3.3/NOPB itself is not AEC-Q100 qualified; however, the pin-compatible LM4132-3.3-Q1 variant (e.g., LM4132CQMF3.3/NOPB) is certified for automotive Grade 1 (–40°C to +125°C ambient) and meets HBM ESD Level 2. For non-automotive industrial or medical use, the LM4132BMFX-3.3/NOPB provides identical electrical performance in the same SOT-23-5 package with B-grade accuracy and 10 ppm/°C tempco.