Texas Instruments LM4140CCMX-4.1/NOPB

Overview

LM4140CCMX-4.1/NOPB from Texas Instruments is a high-precision, low-noise, low-dropout series voltage reference delivering 4.096 V output with ±0.1% initial accuracy, 3 ppm/°C temperature coefficient (C grade), and 2.2 µV_PP (0.1–10 Hz) output noise. It operates from as low as 1.8 V input, supports up to 8 mA load, and features an enable pin for power management - ideal for precision ADC/DAC biasing in portable instrumentation.

For engineers reviewing the LM4140CCMX-4.1/NOPB datasheet, LM4140CCMX-4.1/NOPB pinout, LM4140CCMX-4.1/NOPB application, or LM4140CCMX-4.1/NOPB equivalent, key selection criteria include dropout voltage at 1 mA (20 mV typ), supply current in active mode (265 µA typ), disable current (0.01 µA typ), thermal hysteresis (20 ppm), and required 1-µF output capacitor for stability.

Technical Context

The LM4140CCMX-4.1/NOPB uses EEPROM-trimmed CMOS DACs for curvature-corrected temperature compensation and output voltage trimming - enabling sub-bandgap output voltages (e.g., 4.096 V) with higher resolution than conventional bandgap references. Its P-channel pass transistor architecture supports low dropout and reverse-current protection via intrinsic body diode.

It operates in two functional modes: normal operation (EN = VIN) and shutdown (EN = GND), with VREF restored in <200 µs on enable assertion. The device requires external 1-µF output capacitance for loop stability and transient response, with ESR constraints validated for tantalum, ceramic, and aluminum electrolytic types.

Key Specifications

Pinout & Package

LM4140CCMX-4.1/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 LM4140CCMX-4.1/NOPB, REF5040IDR offers superior accuracy at the cost of 5× higher supply current, while ADR444BRZ delivers marginally lower noise but omits integrated enable control - making LM4140CCMX-4.1/NOPB the optimal balance of precision, ultra-low power, and functional integration for portable and battery-constrained systems.

Availability

LM4140CCMX-4.1/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and medical data acquisition systems requiring stable component supply, long-term calibration retention, and guaranteed lifecycle continuity.

Supply support for LM4140CCMX-4.1/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, embedded processing, and connectivity technologies, with decades of leadership in precision analog ICs.

The LM4140 product line was designed specifically for high-accuracy, low-power, low-dropout voltage reference applications in portable, battery-operated, and space-constrained systems - emphasizing factory-trimmed stability without external components.

FAQ

What is the maximum load current supported by the LM4140CCMX-4.1/NOPB?

The LM4140CCMX-4.1/NOPB can source or sink up to 8 mA while maintaining specified output voltage accuracy and stability. This capability allows direct driving of ADC reference inputs, op-amp bias networks, and small-signal transducers without external buffering. Exceeding 8 mA may cause increased dropout voltage and output deviation beyond ±0.1% tolerance.

Does the LM4140CCMX-4.1/NOPB require an output capacitor, and why?

Yes, the LM4140CCMX-4.1/NOPB requires a minimum 1-µF capacitor between VREF and GND for loop stability and transient response. This capacitor compensates the internal feedback network and supplies instantaneous current during load steps. Omitting it risks oscillation, overshoot, or prolonged settling - especially under dynamic loads like successive-approximation ADC sampling.

How does the enable function operate on the LM4140CCMX-4.1/NOPB?

The LM4140CCMX-4.1/NOPB enable pin (Pin 3) controls output state: pulling it to GND disables VREF and reduces supply current to 0.01 µA (typ), while connecting it to VIN enables normal operation. During disable, internal circuitry actively discharges the output capacitor to GND - ensuring fast, deterministic power-down without floating reference states.

What is the significance of the "4.1" in LM4140CCMX-4.1/NOPB?

The "4.1" in LM4140CCMX-4.1/NOPB denotes the nominal output voltage of 4.096 V - a precision value chosen to align exactly with 2¹² (4096), enabling seamless full-scale mapping in 12-bit digital systems. This avoids fractional scaling factors and minimizes code-to-voltage conversion errors in microcontroller-based measurement applications.

Can the LM4140CCMX-4.1/NOPB be used with ceramic output capacitors?

Yes, multilayer ceramic capacitors (MLCCs) can be used with the LM4140CCMX-4.1/NOPB, but must meet minimum ESR requirements (typically ≥100 mΩ) and minimum capacitance (≥0.2 µF). Some MLCCs exhibit very low ESR and strong voltage/temperature coefficients - consult the capacitor manufacturer's datasheet and verify stability per TI's Figure 22–24 ESR guidelines before final selection.