Texas Instruments LM4132CMFX-1.8

Overview

LM4132CMFX-1.8 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 battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the LM4132CMFX-1.8 datasheet, LM4132CMFX-1.8 pinout, LM4132CMFX-1.8 application, or LM4132CMFX-1.8 equivalent, key selection criteria include dropout voltage at 10 mA (230 mV typ), 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 uses EEPROM-trimmed CMOS band-gap architecture to correct curvature, tempco, and accuracy at package level-overcoming assembly-induced shifts that limit laser-trimmed bipolar references. Its internal LDO regulator eliminates need for external output capacitor or buffer amplifier.

It implements a precision enable interface with VIH = 65% VIN and VIL = 35% VIN, supporting seamless integration into power-managed systems. The device achieves long-term stability of 50 ppm over 1000 hours and maintains output accuracy across –40°C to +125°C ambient temperature range.

Key Specifications

Pinout & Package

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

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 uniquely combines A-grade 0.05% accuracy, enable-controlled 3 µA shutdown, and 10 ppm/°C tempco in a single SOT-23-5 package-making it optimal for high-precision, power-gated portable instrumentation.

Availability

LM4132CMFX-1.8 is available at Aetrix Electronics and suitable for portable data loggers, automotive sensor modules, industrial process transmitters, and medical patient monitors requiring stable component supply with guaranteed long-term availability.

Supply support for LM4132CMFX-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 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 reference performance using cost-effective CMOS EEPROM trimming-targeting high-accuracy, low-power, and space-constrained applications in instrumentation, automotive, and industrial systems.

FAQ

What is the minimum input voltage required for stable operation of the LM4132CMFX-1.8?

The LM4132CMFX-1.8 requires VIN ≥ VREF + 400 mV, i.e., ≥2.2 V, to maintain regulation within 0.5% of nominal 1.8 V output. At 10 mA load, typical dropout is 230 mV; worst-case (–40°C to +125°C) is 400 mV. Operation below 2.2 V risks output collapse or unregulated behavior. Always verify with CIN ≥1 µF ceramic placed near VIN pin.

Does the LM4132CMFX-1.8 require an output capacitor (COUT) for stability?

No, the LM4132CMFX-1.8 is internally compensated and stable without an output capacitor. A 1 µF ceramic COUT is optional and improves transient response and PSRR above 10 kHz-but is not required for basic regulation. This eliminates risk of instability with low-ESR ceramics and reduces BOM count versus shunt or older LDO references.

How does the enable pin (EN) function on the LM4132CMFX-1.8?

The EN pin is active-high with VIH ≥ 65% VIN and VIL ≤ 35% VIN. When pulled high, the LM4132CMFX-1.8 delivers full 1.8 V output; when pulled low or left floating (via internal weak pull-down), it enters 3 µA shutdown mode. No external pull-up is needed-EN may be driven directly from GPIO or open-drain logic.

What grade and accuracy does the 'C' in LM4132CMFX-1.8 indicate?

The 'C' denotes Grade C, specifying ±0.2% initial output voltage accuracy at 25°C and 20 ppm/°C maximum temperature coefficient over –40°C to +125°C. This grade balances cost and performance for industrial applications where A-grade (±0.05%) is unnecessary but tighter tolerance than Grade D/E is required.

Is the LM4132CMFX-1.8 qualified for automotive use?

Yes-the LM4132CMFX-1.8 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 non-safety-critical subsystems including cabin sensors, body control modules, and infotainment power rails-though not certified for ASIL-B or safety-critical domains.