Texas Instruments LM4140BCM-2.0/NOPB

Overview

LM4140BCM-2.0/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 2.048 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (A 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 analog signal chains in battery-powered instrumentation.

For engineers reviewing the LM4140BCM-2.0/NOPB datasheet, LM4140BCM-2.0/NOPB pinout, LM4140BCM-2.0/NOPB application, or LM4140BCM-2.0/NOPB equivalent, key selection considerations include its 2.048 V output voltage, ultra-low 2.2 µV_PP (0.1–10 Hz) noise, 1.8 V minimum operating voltage, SOIC-8 package, and enable-controlled shutdown consuming ≤1 µA.

Technical Context

The LM4140BCM-2.0/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming-enabling sub-bandgap 2.048 V output with 3 ppm/°C drift over 0°C to 70°C. Its P-channel pass transistor architecture supports operation down to VIN = VREF + 20 mV (typical) while maintaining regulation.

It integrates internal charge-discharge circuitry on the enable pin to rapidly disable VREF and sink the output capacitor's stored charge to ground, achieving full turn-off in <200 µs and restoring regulation within 200 µs on enable assertion. The device requires a mandatory 1 µF output capacitor for loop stability and transient response.

Key Specifications

Pinout & Package

LM4140BCM-2.0/NOPB is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with exposed pad not present. Pin functions are validated per TI SNVS053F Rev F datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5020IDR and ADR4520BRZ, LM4140BCM-2.0/NOPB uniquely combines enable control, sub-1 µA shutdown, and 2.2 µV_PP noise in a cost-optimized SOIC-8 package-making it optimal for battery-constrained, intermittently active precision systems.

Availability

LM4140BCM-2.0/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, battery-powered medical devices, and automotive body electronics requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for LM4140BCM-2.0/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, embedded processing, and connectivity technologies with broad industrial, automotive, and consumer applications.

The LM4140 product line delivers high-accuracy, low-drift voltage references optimized for portable, battery-powered, and precision measurement systems where low dropout, low noise, and enable-controlled power management are essential.

FAQ

What is the exact output voltage tolerance and temperature coefficient of LM4140BCM-2.0/NOPB?

The LM4140BCM-2.0/NOPB has a guaranteed initial accuracy of ±0.1% at 25°C and a temperature coefficient of 3 ppm/°C (A grade) over 0°C to 70°C. These specifications are production-tested and documented in TI's SNVS053F datasheet. The 2.048 V nominal output is trimmed via EEPROM and DAC, ensuring tight distribution without laser adjustment. LM4140BCM-2.0/NOPB maintains this performance across its full operating range when used with the required 1 µF output capacitor.

Does LM4140BCM-2.0/NOPB require an external output capacitor, and what type is recommended?

Yes, LM4140BCM-2.0/NOPB requires a minimum 1 µF output capacitor connected between VREF and GND for loop stability and transient response. TI validates solid tantalum (e.g., Kemet T491A105M010AS) and multilayer ceramic capacitors (e.g., Murata GRM42-6Y5V225Z16) meeting ESR requirements. Aluminum electrolytics are discouraged below 0°C due to ESR rise. LM4140BCM-2.0/NOPB will not regulate stably without this capacitor.

How does the enable pin function on LM4140BCM-2.0/NOPB, and what happens to the output during shutdown?

The enable pin (Pin 3) controls LM4140BCM-2.0/NOPB's operational state: pulled high (≥0.8×V_IN) for normal operation; pulled low (≤0.4 V) for shutdown. During shutdown, LM4140BCM-2.0/NOPB actively discharges the output capacitor to ground via internal circuitry, bringing VREF to 0 V within microseconds. Supply current drops to ≤1 µA, and VREF resumes within 200 µS upon re-enable.

Can LM4140BCM-2.0/NOPB operate from a 1.8 V supply, and what is its minimum input voltage?

Yes, LM4140BCM-2.0/NOPB supports 1.8 V minimum supply voltage. Its dropout voltage is 20 mV (typical) at 1 mA load, so the minimum valid input is 2.068 V (2.048 V + 20 mV) at room temperature. At full temperature range and 8 mA load, dropout rises to 45 mV, requiring VIN ≥2.093 V. This enables direct use with single-cell Li-ion (3.0–4.2 V) and alkaline (1.8–3.0 V) sources.

Is LM4140BCM-2.0/NOPB pin-compatible with other members of the LM4140 family, such as LM4140ACM-2.5/NOPB?

Yes, all LM4140 variants-including LM4140BCM-2.0/NOPB and LM4140ACM-2.5/NOPB-share identical 8-pin SOIC packaging and pinout (Pins 1,4,7,8=GND; 2=VIN; 3=EN; 5=NC; 6=VREF). Only the output voltage and grade (A/B/C) differ. This allows drop-in replacement across voltage options in existing PCB layouts, provided the 1 µF output capacitor and enable logic levels are verified for the new variant.