Texas Instruments LM4120IM5-2.5/NOPB

Overview

LM4120IM5-2.5/NOPB from Texas Instruments is a precision micropower low-dropout bandgap voltage reference delivering 2.5 V ±0.5% initial accuracy, 50 ppm/°C temperature coefficient, and 120 mV typical dropout at 1 mA load. It features enable-controlled power-down (ISS < 2 µA), ±5 mA source/sink capability, and operates from 2 V to 12 V input across −40°C to 85°C - ideal for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the LM4120IM5-2.5/NOPB datasheet, LM4120IM5-2.5/NOPB pinout, LM4120IM5-2.5/NOPB application, or LM4120IM5-2.5/NOPB equivalent, key selection criteria include dropout voltage under load, enable logic thresholds (VL = 0.4 V, VH = 2.4 V), output noise (46 µVPP, 0.1–10 Hz), long-term stability (100 ppm over 1000 hrs), and SOT-23-5 thermal performance (RθJA = 170.4°C/W).

Technical Context

The LM4120IM5-2.5/NOPB implements a bandgap-based reference core with internal error amplifier and pass transistor, enabling low-noise, high-accuracy regulation without external components. Its enable pin controls analog startup via ~6 µA input current and requires ≥0.003 V/µs slew rate to avoid output glitches.

It supports stable operation with 0.022–0.047 µF ceramic output capacitors (ESR 0.1–0.5 Ω) and tolerates up to 1 µF tantalum for improved transient response. The unconnected REF pin is highly noise-sensitive and must be isolated in layout to prevent voltage drift from capacitive coupling or mechanical stress.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 1.60 mm × 2.90 mm body size, RoHS-compliant, tape-and-reel packaging (1000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C25IDBZR and REF3025AIDBZR, the LM4120IM5-2.5/NOPB uniquely combines enable-driven ultra-low-power shutdown, lowest dropout in its class, and SOT-23-5 footprint - making it the only option for compact, battery-operated systems requiring both precision and aggressive power gating.

Availability

LM4120IM5-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial data loggers, and automotive cabin electronics requiring stable component supply with guaranteed long-term continuity.

Supply support for LM4120IM5-2.5/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 specializing in analog and embedded processing technologies, with decades of expertise in precision analog ICs and voltage references.

The LM4120 product line delivers micropower, low-dropout voltage references optimized for battery-powered and space-constrained applications where accuracy, stability, and power efficiency are critical.

FAQ

What is the maximum input voltage for LM4120IM5-2.5/NOPB?

The absolute maximum input voltage for LM4120IM5-2.5/NOPB is 14 V, but recommended operating conditions specify a maximum of 12 V. Exceeding 12 V risks accelerated aging and reduced long-term stability, especially at elevated temperatures. The device is designed for 2–12 V operation to ensure optimal performance across its −40°C to +85°C industrial temperature range.

Does LM4120IM5-2.5/NOPB require an output capacitor?

Yes, LM4120IM5-2.5/NOPB requires a minimum 0.022 µF ceramic output capacitor for loop stability and low-noise operation. Values up to 0.047 µF ceramic are fully supported; larger values (up to 1 µF) require tantalum construction and a 50-pF capacitor between VOUT and REF. Omitting the capacitor causes oscillation and increased output noise.

What is the logic threshold for enabling LM4120IM5-2.5/NOPB?

LM4120IM5-2.5/NOPB enables when the EN pin voltage exceeds 2.4 V (VH, min) and disables when pulled to ≤0.4 V (VL, max) at TA = 25°C. Over −40°C to +85°C, VL may drop to 0.2 V and VH remains 2.4 V. A direct connection to VIN ensures reliable activation; floating the EN pin is not permitted and causes undefined behavior.

Can LM4120IM5-2.5/NOPB drive a 5 mA load continuously?

Yes, LM4120IM5-2.5/NOPB is rated for continuous ±5 mA output current. At 5 mA load, dropout voltage rises to 180–210 mV (typ/max), and junction temperature must remain within limits - with RθJA = 170.4°C/W, power dissipation stays below 15 mW, ensuring safe operation in standard SOT-23 layouts without heatsinking.

Is the REF pin on LM4120IM5-2.5/NOPB connected internally?

No, the REF pin on LM4120IM5-2.5/NOPB is not connected internally and must remain unconnected in all applications. It is a sensitive node tied to the internal bandgap reference and is highly susceptible to noise and capacitive loading. PCB layout guidelines require complete isolation - no traces, vias, or copper pours near this pin to prevent output voltage drift and thermal hysteresis.