Texas Instruments LM4132DMFX-2.5/NOPB

Overview

LM4132DMFX-2.5/NOPB from Texas Instruments is a precision low-dropout (LDO) series voltage reference IC delivering a stable 2.5 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 LM4132DMFX-2.5/NOPB datasheet, LM4132DMFX-2.5/NOPB pinout, LM4132DMFX-2.5/NOPB application, or LM4132DMFX-2.5/NOPB equivalent, key selection criteria include dropout voltage at 10 mA (175 mV typ), 0.1–10 Hz noise (240 µV_PP), thermal hysteresis (75 ppm), long-term stability (50 ppm over 1000 hrs), and SOT-23-5 package compatibility with low-ESR ceramic capacitors.

Technical Context

The LM4132DMFX-2.5/NOPB implements a CMOS band-gap architecture with EEPROM-based curvature and tempco correction, enabling laser-trimmed-level precision without laser trimming. Its internal architecture eliminates the need for an output capacitor or buffer amplifier while maintaining regulation under full 20 mA load.

It operates as a series reference with active enable control: EN pin accepts 35%–65% of VIN logic thresholds, entering 3 µA shutdown when pulled low. Dropout is defined as the minimum VIN–VREF differential sustaining 0.5% output accuracy - 175 mV typical at 10 mA and 400 mV max across –40°C to 125°C.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the LM4132DMFX-2.5/NOPB uniquely combines A-grade 0.05% accuracy, 10 ppm/°C tempco, integrated enable, and 3 µA shutdown - making it optimal for battery-critical, high-stability applications where both precision and dynamic power control are required.

Availability

LM4132DMFX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial analog I/O modules, medical patient monitors, and test & measurement equipment requiring stable component supply and guaranteed long-term availability.

Supply support for LM4132DMFX-2.5/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, power management, and signal chain solutions.

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

FAQ

What is the maximum load current supported by the LM4132DMFX-2.5/NOPB?

The LM4132DMFX-2.5/NOPB delivers up to 20 mA of output current while maintaining output voltage accuracy within 0.5% of nominal 2.5 V. This capability allows it to drive multiple precision ADC references or op-amp bias networks without external buffering. The device sustains this performance across its full operating temperature range (–40°C to +125°C) and input voltage range (VREF + 400 mV to 5.5 V).

Does the LM4132DMFX-2.5/NOPB require an output capacitor for stability?

No, the LM4132DMFX-2.5/NOPB is internally compensated and stable without an output capacitor. A 1 µF low-ESR ceramic capacitor on VIN is required, but COUT is optional. This simplifies layout and reduces BOM count - especially valuable in space-constrained designs like handheld test gear or wearable medical sensors where the LM4132DMFX-2.5/NOPB serves as the primary reference.

What is the enable pin logic threshold for the LM4132DMFX-2.5/NOPB?

The LM4132DMFX-2.5/NOPB EN pin uses ratio-metric thresholds: VIH ≥ 65% of VIN and VIL ≤ 35% of VIN. For example, with VIN = 5 V, EN must exceed 3.25 V to activate and drop below 1.75 V to enter 3 µA shutdown. This design ensures robust enable control across varying input rails - a key feature distinguishing the LM4132DMFX-2.5/NOPB from fixed-threshold alternatives.

How does the LM4132DMFX-2.5/NOPB achieve 10 ppm/°C temperature coefficient?

The LM4132DMFX-2.5/NOPB achieves 10 ppm/°C (0°C to 85°C) via EEPROM-programmable curvature correction applied to its CMOS band-gap core. Unlike laser-trimmed references, this method compensates for die-package stress shifts post-assembly - a major source of tempco degradation in plastic SOT-23 packages. This architecture is validated in the LM4132DMFX-2.5/NOPB's A-grade specification and confirmed in TI's SNVS372G datasheet Section 6.7.

Is the LM4132DMFX-2.5/NOPB suitable for automotive applications?

The LM4132DMFX-2.5/NOPB itself is not AEC-Q100 qualified; however, the pin-compatible LM4132Q1DMFX-2.5/NOPB (automotive grade) is available. That variant meets AEC-Q100 Grade 1 (–40°C to +125°C ambient), includes HBM ESD level 2 qualification, and shares identical electrical specs - including 0.05% accuracy and 10 ppm/°C tempco. For non-automotive industrial or medical use, the LM4132DMFX-2.5/NOPB remains fully appropriate.