Texas Instruments LM4140CCM-2.5/NOPB

Overview

LM4140CCM-2.5/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 2.5 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (C grade), 20 mV typical dropout at 1 mA, and 230 µA typical supply current. It features an enable pin for power management and supports precision data acquisition, portable instrumentation, and battery-powered systems requiring stable low-voltage references.

For engineers reviewing the LM4140CCM-2.5/NOPB datasheet, LM4140CCM-2.5/NOPB pinout, LM4140CCM-2.5/NOPB application, or LM4140CCM-2.5/NOPB equivalent, key selection considerations include its 2.5 V fixed output, SOIC-8 package, enable-controlled shutdown (<1 µA), ultra-low 0.1 Hz–10 Hz noise (2.2 µV_PP), and operation down to 1.8 V input.

Technical Context

The LM4140CCM-2.5/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling 3 ppm/°C drift over 0°C to 70°C and eliminating need for external laser trimming. Its P-channel pass transistor architecture enables low dropout (20 mV typ.) and reverse-current protection via intrinsic body diode.

It operates in two functional modes: normal regulation (EN = VIN) and shutdown (EN = GND), achieving full output recovery in <200 µs. The device requires a mandatory 1 µF output capacitor for loop stability and transient response, with ESR constraints validated for tantalum, ceramic, and aluminum electrolytic types.

Key Specifications

Pinout & Package

LM4140CCM-2.5/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm), optimized for automated assembly and thermal performance (R_θJA = 119.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5025IDR and ADR4525BRZ, LM4140CCM-2.5/NOPB uniquely balances 0.1% accuracy, 20 mV dropout, enable control, and 230 µA supply current - making it optimal for space-constrained, battery-operated systems needing regulated 2.5 V at minimal overhead.

Availability

LM4140CCM-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and battery charging systems requiring stable component supply, long-term calibration retention, and industrial temperature-grade performance.

Supply support for LM4140CCM-2.5/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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.

The LM4140 product line delivers high-accuracy, low-noise, low-dropout voltage references for precision measurement and portable electronics - engineered to replace traditional bandgap references with EEPROM-trimmed DAC-based architectures.

FAQ

What is the minimum input voltage required for LM4140CCM-2.5/NOPB to regulate at 2.5 V?

The LM4140CCM-2.5/NOPB requires a minimum input voltage of 2.52 V (2.5 V + 20 mV typical dropout) at 1 mA load and 25°C. Over temperature (0°C to 70°C), the maximum dropout rises to 45 mV, so VIN must be ≥2.545 V to guarantee regulation across the full range. Input below this threshold causes output collapse and loss of reference stability.

Does LM4140CCM-2.5/NOPB require an output capacitor, and what value is mandatory?

Yes - LM4140CCM-2.5/NOPB requires a 1 µF output capacitor connected between VREF and GND for loop stability and transient response. TI specifies this as mandatory; omitting it risks oscillation or overshoot during load steps. The capacitor must meet ESR limits shown in Figures 22–24 of the datasheet, with solid tantalum (e.g., Kemet T491A105M010AS) being the most validated choice.

How does the enable pin function on LM4140CCM-2.5/NOPB, and what happens to the output during shutdown?

The enable pin (Pin 3) controls LM4140CCM-2.5/NOPB's operational state: pulled high to VIN for normal operation, pulled low to GND for shutdown. During shutdown, LM4140CCM-2.5/NOPB actively discharges the output capacitor to ground via internal circuitry, bringing VREF to 0 V within microseconds and reducing supply current to ≤1 µA - preventing residual voltage from affecting downstream circuitry.

What is the output noise specification for LM4140CCM-2.5/NOPB, and how does it scale with output voltage?

LM4140CCM-2.5/NOPB delivers 2.2 µV_PP (0.1 Hz to 10 Hz) output noise, measured at its 2.5 V output. Per datasheet Section 6.5 Note 7, noise is linearly proportional to VREF - meaning a 1.25 V version would exhibit ~1.1 µV_PP, while a 4.096 V version would show ~3.6 µV_PP. This scaling enables predictable noise budgeting across the LM4140 family.

Can LM4140CCM-2.5/NOPB drive a 10 kΩ load directly, and what is its load regulation performance?

Yes - LM4140CCM-2.5/NOPB can directly drive a 10 kΩ load (250 µA at 2.5 V) well within its ±8 mA output capability. Load regulation is specified as 1–20 ppm/mA (typ.), translating to ≤0.02 mV change over 0–250 µA - ensuring <0.001% error for typical precision ADC biasing and sensor excitation applications.