Texas Instruments LM4132DMFX-2.5

Overview

LM4132DMFX-2.5 from Texas Instruments is a precision low-dropout (LDO) voltage reference IC delivering a stable 2.5 V output with 0.05% initial accuracy (A-grade), 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA quiescent current. It operates from VIN = VREF + 400 mV (min) up to 5.5 V, supports 20 mA load current, and features an enable pin for 3 µA shutdown mode - ideal for high-accuracy ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4132DMFX-2.5 datasheet, LM4132DMFX-2.5 pinout, LM4132DMFX-2.5 application, or LM4132DMFX-2.5 equivalent, key selection criteria include dropout voltage at 10 mA (175 mV typ), 0.1–10 Hz noise (240 µV_PP), line regulation (50 ppm/V), thermal hysteresis (75 ppm), and SOT-23-5 package compatibility with low-ESR ceramic capacitors.

Technical Context

The LM4132DMFX-2.5 uses EEPROM-trimmed CMOS band-gap architecture to achieve laser-trimmed bipolar-level precision without requiring output buffering or external capacitors. Its curvature correction and tempco compensation are programmed at package level to counteract assembly-induced shifts.

It implements a series-shunt topology with internal error amplifier, reference core, and pass element - enabling true LDO operation (dropout ≤400 mV over full temp range), enable-controlled sleep mode, and stable performance under varying load (0–20 mA) and input (2.9–5.5 V) conditions.

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, moisture sensitivity level 1.

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 uniquely combines A-grade tempco (10 ppm/°C), enable functionality, and ultra-low 3 µA shutdown - making it optimal for portable, intermittently active precision systems where both accuracy and power agility are required.

Availability

LM4132DMFX-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin sensors, industrial process controllers, and battery-powered medical monitors requiring stable component supply with guaranteed long-term sourcing.

Supply support for LM4132DMFX-2.5 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 leadership in precision analog ICs.

The LM4132 family was designed to deliver laser-trimmed reference performance using cost-effective CMOS EEPROM trimming - targeting high-accuracy data acquisition, test equipment, and automotive sensing applications where stability, low power, and small size are critical.

FAQ

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

The LM4132DMFX-2.5 delivers up to 20 mA of output current while maintaining specified accuracy and regulation. This capability eliminates the need for external buffer amplifiers in most precision applications, including driving ADC reference inputs, DAC outputs, or low-power op-amp bias networks. The device sustains this current across its full operating temperature range (–40°C to +125°C) and input voltage range (2.9 V to 5.5 V).

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

No, the LM4132DMFX-2.5 is internally compensated and stable without an output capacitor - a key differentiator from many competing references. While C_OUT is optional, adding ≥1 µF ceramic capacitor improves PSRR and transient response. In contrast, the input capacitor C_IN is mandatory per datasheet requirements to ensure proper startup and noise rejection.

What does the "DMFX" suffix indicate in LM4132DMFX-2.5?

The "DMFX" suffix denotes the SOT-23-5 (DBV) package, tape-and-reel packaging (M), and commercial temperature grade (–40°C to +125°C). It specifically identifies the A-grade (0.05% initial accuracy) version with 2.5 V output. This ordering code aligns with Texas Instruments' standardized nomenclature for the LM4132 family and confirms full compliance with the LM4132-2.5 A-grade electrical specifications.

How does the enable pin function on the LM4132DMFX-2.5?

The EN pin on the LM4132DMFX-2.5 is an active-high digital control input. When pulled to ≥65% of VIN, the device operates normally; when pulled to ≤35% of VIN, it enters a 3 µA shutdown state. The pin includes built-in hysteresis to prevent chatter during slow transitions. This enables precise power-gating control via microcontroller GPIOs, extending battery life in duty-cycled systems without external logic.

Is the LM4132DMFX-2.5 suitable for automotive applications?

Yes - the LM4132DMFX-2.5 is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), with HBM ESD rating of ±2000 V. It meets automotive reliability requirements for cabin modules, body control units, and sensor interfaces. Its low dropout (175 mV typ), low noise (240 µV_PP), and enable functionality make it especially well-suited for infotainment, ADAS proximity sensors, and battery monitoring systems where precision and power efficiency coexist.