Texas Instruments LM4128AQ1MF4.1/NOPB

Overview

LM4128AQ1MF4.1/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified, precision micropower series voltage reference in a 5-pin SOT-23 package, delivering 4.096 V output with ±0.1% initial accuracy, 75 ppm/°C max temperature coefficient, and 60 µA supply current. It enables battery-powered instrumentation and automotive sensor signal conditioning where low dropout (175 mV @10 mA), shutdown mode (3 µA), and stability with up to 10 µF capacitive loads are critical.

For engineers reviewing the LM4128AQ1MF4.1/NOPB datasheet, LM4128AQ1MF4.1/NOPB pinout, LM4128AQ1MF4.1/NOPB application, or LM4128AQ1MF4.1/NOPB equivalent, this page provides verified specifications, validated pin functions, automotive-grade thermal performance (−40°C to +125°C), and real-world design implications for precision ADC biasing, sensor excitation, and closed-loop regulator references.

Technical Context

The LM4128AQ1MF4.1/NOPB uses an internal band-gap-derived architecture optimized for low quiescent current and minimal thermal drift. Its enable-controlled series topology eliminates external stabilization capacitors while maintaining stability across load currents from 0 to 20 mA and output capacitance up to 10 µF.

It operates with VIN ≥ VREF + 400 mV (min 4.496 V at 10 mA load) and supports rail-to-rail enable logic (VIH = 65% VIN, VIL = 35% VIN). The device features indefinite short-circuit protection (75 mA limit) and exhibits 350 µVPP integrated noise (0.1–10 Hz) - critical for 12-bit+ data acquisition systems requiring stable reference excitation.

Key Specifications

Pinout & Package

LM4128AQ1MF4.1/NOPB is housed in a RoHS-compliant 5-pin SOT-23 (DBV) package, 2.9 mm × 1.6 mm × 1.15 mm, rated for −40°C to +125°C junction temperature and compatible with standard reflow profiles (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4128AQ1MF4.1/NOPB, REF3440RTER trades 35 µA higher supply current for 0.05% tighter accuracy and 72× lower tempco, while ADR3440ARJZ-R7 matches initial tolerance but delivers 7.5× better temperature stability - both require validation of enable logic compatibility and PCB layout changes.

Availability

LM4128AQ1MF4.1/NOPB is available at Aetrix Electronics and suitable for automotive sensor modules, portable instrumentation, and industrial PLC analog input designs requiring stable component supply, AEC-Q100 compliance, and long-term parametric consistency.

Supply support for LM4128AQ1MF4.1/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and automotive-grade manufacturing.

The LM4128 product line delivers micropower, high-accuracy series voltage references optimized for space-constrained, battery-operated, and automotive applications demanding guaranteed performance across extended temperature ranges.

FAQ

What is the minimum input voltage required for stable operation of LM4128AQ1MF4.1/NOPB?

The LM4128AQ1MF4.1/NOPB requires VIN ≥ VREF + 400 mV for regulation at full 10 mA load, i.e., ≥4.496 V. At lighter loads, dropout decreases - e.g., 175 mV at 10 mA yields 4.271 V minimum. Below this threshold, output voltage collapses nonlinearly. Always verify VIN margin across worst-case temperature and aging conditions in final design.

Does LM4128AQ1MF4.1/NOPB require an input capacitor, and what value is recommended?

Yes - LM4128AQ1MF4.1/NOPB requires a minimum 0.1 µF ceramic input capacitor (X5R/X7R) for stability. When using COUT, CIN must be ≥ COUT; for 10 µF COUT, use ≥10 µF CIN. Larger values (4.7–22 µF) reduce startup overshoot and improve PSRR above 10 kHz. Mount CIN within 2 mm of VIN and GND pins to minimize inductance.

How does the enable pin (EN) function on LM4128AQ1MF4.1/NOPB, and what are its voltage thresholds?

The EN pin on LM4128AQ1MF4.1/NOPB is active-high with internal ~2 µA pull-up. VIH = 65% VIN and VIL = 35% VIN define switching thresholds - e.g., at VIN = 5 V, EN activates above 3.25 V and deactivates below 1.75 V. Leaving EN unconnected defaults to enabled state. Do not drive EN above VIN, as it may cause latch-up or damage.

What is the thermal hysteresis specification for LM4128AQ1MF4.1/NOPB, and how does it impact calibration?

LM4128AQ1MF4.1/NOPB exhibits ≤75 ppm thermal hysteresis over −40°C to +125°C cycling, equivalent to ≤0.307 mV shift at 4.096 V. This represents the maximum reversible output voltage difference after temperature excursion - critical for systems performing factory calibration at 25°C then deployed across wide ambient swings, as it bounds post-thermal-settling error without re-trimming.

Can LM4128AQ1MF4.1/NOPB drive a 10 µF ceramic output capacitor, and what effect does this have on transient response?

Yes - LM4128AQ1MF4.1/NOPB is explicitly characterized stable with up to 10 µF ceramic COUT. Adding COUT improves load transient response: step-load recovery time drops from ~100 µs (no COUT) to ~20 µs (10 µF), reducing output droop by >60%. However, turn-on time increases from 33.2 µs (1 µF) to 78.8 µs (10 µF), which must be accounted for in power sequencing.