Texas Instruments LM4132CMFX-1.8/NOPB

Overview

LM4132CMFX-1.8/NOPB from Texas Instruments is a precision low-dropout (LDO) series 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 quiescent current. It operates from VIN = VREF + 400 mV to 5.5 V, supports up to 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 LM4132CMFX-1.8/NOPB datasheet, LM4132CMFX-1.8/NOPB pinout, LM4132CMFX-1.8/NOPB application, or LM4132CMFX-1.8/NOPB equivalent, key selection criteria include dropout voltage ≤230 mV at 10 mA, line regulation ≤30 ppm/V, load regulation ≤25 ppm/mA, thermal hysteresis ≤75 ppm, and compatibility with low-ESR ceramic capacitors without requiring an output buffer.

Technical Context

The LM4132CMFX-1.8/NOPB implements a CMOS band-gap architecture with EEPROM-based curvature, tempco, and accuracy correction - enabling package-level programming to compensate for assembly-induced shifts. This eliminates laser trimming while matching bipolar reference performance.

It functions as a three-terminal series reference with active enable control, internal overcurrent protection, and no requirement for an output capacitor. Its SOT-23-5 package integrates VIN, GND, EN, VREF, and N/C pins - supporting space-constrained, battery-powered systems where low quiescent current and tight voltage tolerance are critical.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body size, surface-mount, lead-free (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 LM4132CMFX-1.8/NOPB uniquely combines AEC-Q100 Grade 1 qualification, enable-controlled 3 µA shutdown, and 10 ppm/°C tempco in a production-proven SOT-23-5 package - making it the only option qualified for automotive BMS and industrial field instruments requiring both low power and high stability.

Availability

LM4132CMFX-1.8/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC analog inputs, medical patient monitors, and automotive battery management systems requiring stable component supply with long-term calibration integrity.

Supply support for LM4132CMFX-1.8/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 automotive-grade components.

The LM4132 family was designed to deliver laser-trimmed bipolar reference performance using cost-effective, EEPROM-programmable CMOS technology - targeting high-accuracy data acquisition, test equipment, and safety-critical automotive sensor systems.

FAQ

What is the maximum input voltage for LM4132CMFX-1.8/NOPB?

The LM4132CMFX-1.8/NOPB supports a maximum input voltage of 5.5 V, as specified in the Recommended Operating Conditions table. Exceeding this voltage risks permanent damage per Absolute Maximum Ratings. The device requires a minimum input of VREF + 400 mV (i.e., ≥2.2 V) to maintain regulation, and its dropout voltage is 230 mV at 10 mA load - meaning 2.03 V input sustains 1.8 V output under that condition. Always include a ≥1 µF ceramic input capacitor (CIN) for stability.

Does LM4132CMFX-1.8/NOPB require an output capacitor?

No, the LM4132CMFX-1.8/NOPB is stable without an output capacitor (COUT), unlike many LDO references. The datasheet explicitly states COUT is optional and only recommended to improve transient response under fast load changes. Stability is guaranteed with just the required input capacitor (CIN ≥1 µF, low-ESR ceramic). Omitting COUT reduces component count, PCB area, and cost - a key advantage in space-constrained designs.

What is the enable pin logic level threshold for LM4132CMFX-1.8/NOPB?

The LM4132CMFX-1.8/NOPB enable pin uses ratio-metric thresholds: VIH (minimum high level) is 65% of VIN, and VIL (maximum low level) is 35% of VIN - ensuring robust operation across its full 2.2 V to 5.5 V input range. For example, at VIN = 3.3 V, EN must exceed 2.15 V to activate and fall below 1.16 V to enter 3 µA shutdown. This design prevents false triggering during power ramp-up or brownout conditions.

Is LM4132CMFX-1.8/NOPB qualified for automotive applications?

Yes, the LM4132CMFX-1.8/NOPB is AEC-Q100 qualified for Automotive Grade 1 (–40°C to +125°C ambient operating temperature), with HBM ESD rating of ±2000 V. It meets stringent reliability and thermal cycling requirements for under-hood and ADAS applications. While the standard LM4132 part number is automotive-capable, note that the Q1 variant (e.g., LM4132Q1) includes additional automotive-specific testing - but LM4132CMFX-1.8/NOPB itself carries full Grade 1 qualification per the official datasheet.

How does the LM4132CMFX-1.8/NOPB achieve 0.05% initial accuracy without laser trimming?

The LM4132CMFX-1.8/NOPB achieves 0.05% initial accuracy using EEPROM registers to digitally correct curvature, temperature coefficient, and absolute voltage error on a CMOS band-gap core. This package-level programming compensates for die-to-package assembly shifts that degrade laser-trimmed devices - enabling high precision at lower cost and higher yield. Each unit is individually calibrated during final test, with correction data stored permanently in on-chip EEPROM.