Texas Instruments LM4132EMFX-1.8

Overview

LM4132EMFX-1.8 from Texas Instruments is a precision low-dropout (LDO) voltage reference IC delivering a stable 1.8 V output with ±0.05% initial accuracy (A-grade), 10 ppm/°C temperature coefficient (0°C to 85°C), and 60 µA supply 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 LM4132EMFX-1.8 datasheet, LM4132EMFX-1.8 pinout, LM4132EMFX-1.8 application, or LM4132EMFX-1.8 equivalent, key selection criteria include dropout voltage at 10 mA (230 mV typ), 0.1–10 Hz noise (170 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 LM4132EMFX-1.8 uses EEPROM-trimmed CMOS bandgap architecture to achieve laser-trimmed bipolar-level precision without laser trimming. Its curvature, tempco, and accuracy are corrected at package level to mitigate assembly-induced shifts - enabling consistent 1.8 V output across temperature and time.

It operates as a series (not shunt) reference, eliminating idle current waste under no-load conditions. The integrated enable logic accepts VIH ≥ 65% VIN and VIL ≤ 35% VIN, supporting direct microcontroller GPIO control without external level-shifting.

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 REF3018AIDBZR and ADR3418ARJZ-R7, the LM4132EMFX-1.8 uniquely combines A-grade 10 ppm/°C tempco, 3 µA shutdown, and 20 mA drive in a single SOT-23-5 package - making it optimal for battery-operated, high-accuracy systems requiring dynamic power management.

Availability

LM4132EMFX-1.8 is available at Aetrix Electronics and suitable for portable instrumentation, automotive engine control units, medical patient monitors, and industrial PLC analog input modules requiring stable component supply with guaranteed long-term availability.

Supply support for LM4132EMFX-1.8 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.

The LM4132 family was designed to deliver laser-trimmed reference performance using cost-effective, programmable CMOS technology - targeting high-accuracy data acquisition, test equipment, and automotive sensing applications.

FAQ

What is the minimum input voltage required for stable operation of the LM4132EMFX-1.8?

The LM4132EMFX-1.8 requires VIN ≥ VREF + 400 mV for guaranteed regulation, so minimum input is 2.2 V. At 10 mA load, typical dropout is 230 mV (VIN = 2.03 V), but TI specifies 400 mV worst-case over temperature - design to ≥2.2 V for margin. Operation below this risks output deviation exceeding 0.5%.

Does the LM4132EMFX-1.8 require an output capacitor for stability?

No, the LM4132EMFX-1.8 is internally compensated and stable without an output capacitor. However, adding a 1 µF low-ESR ceramic capacitor at the VREF pin improves PSRR above 10 kHz and reduces high-frequency noise coupling - recommended for mixed-signal systems sharing noisy digital supplies.

How does the enable pin interface with standard 3.3 V GPIOs?

The LM4132EMFX-1.8 EN pin accepts VIH ≥ 65% VIN and VIL ≤ 35% VIN. With VIN = 3.3 V, VIH ≥ 2.15 V and VIL ≤ 1.16 V - fully compatible with 3.3 V CMOS logic. No level-shifter needed; direct connection to MCU GPIO suffices for reliable on/off control.

What grade (A–E) does the 'E' in LM4132EMFX-1.8 indicate?

The 'E' in LM4132EMFX-1.8 denotes the device grade: E-grade offers ±0.5% initial accuracy and 30 ppm/°C max tempco (–40°C to 125°C). This differs from the A-grade (±0.05%, 10 ppm/°C) referenced in general family descriptions - the part number suffix explicitly defines its tested performance bin.

Can the LM4132EMFX-1.8 drive a 10 kΩ load directly?

Yes. With 1.8 V output and 10 kΩ load, current draw is 180 µA - well within the LM4132EMFX-1.8's 20 mA maximum output capability. Load regulation is specified at 25 ppm/mA, so expected output shift is <0.005% - negligible for most precision applications.