Texas Instruments LM4040DIZ-2.5/NOPB

Overview

LM4040DIZ-2.5/NOPB from Texas Instruments is a precision micropower shunt voltage reference in TO-92 package, delivering a stable 2.5 V reverse breakdown voltage with ±25 mV (±1%) initial tolerance at 25°C, 100 ppm/°C max temperature coefficient, and 35 μV_rms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 15 mA over −40°C to +85°C and requires no output capacitor.

For engineers reviewing the LM4040DIZ-2.5/NOPB datasheet, LM4040DIZ-2.5/NOPB pinout, LM4040DIZ-2.5/NOPB application, or LM4040DIZ-2.5/NOPB equivalent, key selection criteria include industrial-grade temperature range, shunt topology compatibility with high-impedance bias networks, low-noise analog sensing requirements, and TO-92 through-hole mounting for legacy or test-board designs.

Technical Context

The LM4040DIZ-2.5/NOPB uses Zener-zap trimming during wafer sort to achieve ±1% initial accuracy and incorporates bandgap-derived temperature drift curvature correction. Its shunt architecture relies on external current limiting and regulates by sinking variable current to maintain fixed cathode-to-anode voltage.

It features low dynamic impedance (≤1.1 Ω at 1 mA), tolerates capacitive loads without oscillation, and maintains stability across its full 60 μA–15 mA operating current range - enabling use in low-power data acquisition and field transmitter biasing where supply headroom is constrained.

Key Specifications

Pinout & Package

LM4040DIZ-2.5/NOPB is housed in a 3-pin TO-92 package (body size 4.30 mm × 4.30 mm), with leads designed for through-hole PCB assembly and manual prototyping. Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is NC (no connect), which must be left floating or tied to Anode per TI layout guidance for EMI-sensitive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040CIZ-2.5/NOPB, the LM4040DIZ-2.5/NOPB trades 0.5% initial accuracy for lower cost and sufficient performance in industrial field instruments; versus TL431ACLP, it offers superior noise, lower min current, and simpler two-terminal implementation - but lacks adjustability and high-current capability.

Availability

LM4040DIZ-2.5/NOPB is available at Aetrix Electronics and suitable for field transmitters, energy infrastructure monitoring, and analog input modules requiring stable component supply with long-lifecycle support and consistent TO-92 through-hole form factor.

Supply support for LM4040DIZ-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.

The LM4040-N series was designed specifically for space-constrained, low-power shunt reference applications in industrial, automotive, and energy systems - prioritizing accuracy, thermal stability, and ease of use without external compensation.

FAQ

What is the maximum operating temperature range for LM4040DIZ-2.5/NOPB?

The LM4040DIZ-2.5/NOPB is rated for industrial temperature operation from −40°C to +85°C. It is not qualified for extended temperature grades (−40°C to +125°C); that specification applies only to LM4040-N-Q1 automotive variants or specific grade-E versions in other packages. Always verify ambient and junction temperature limits using the 170°C/W thermal resistance value for TO-92 in your layout.

Does LM4040DIZ-2.5/NOPB require an external capacitor for stability?

No, the LM4040DIZ-2.5/NOPB does not require an external capacitor for stability. Its internal design eliminates the need for output capacitance, and it remains stable even with capacitive loads - a key advantage over older shunt references. This simplifies PCB layout and reduces BOM count in analog signal conditioning circuits using the LM4040DIZ-2.5/NOPB.

What is the minimum cathode current needed for LM4040DIZ-2.5/NOPB to regulate properly?

The LM4040DIZ-2.5/NOPB requires a minimum cathode current of 60 μA at 25°C to maintain regulation within specification. At temperature extremes (−40°C or +85°C), the minimum increases to 65 μA. Below this threshold, output voltage deviates significantly from 2.5 V; ensure the series bias resistor delivers ≥65 μA across the full operating temperature range when designing with LM4040DIZ-2.5/NOPB.

How does the NC pin (Pin 3) function on LM4040DIZ-2.5/NOPB?

Pin 3 of the LM4040DIZ-2.5/NOPB is a no-connect terminal. Per TI's datasheet, it must either be left floating or connected to the Anode (Pin 2). In high-EMI environments - such as near switching power supplies or motor drives - TI recommends tying Pin 3 to Anode to reduce noise coupling. It is not an active signal and carries no current in normal operation of the LM4040DIZ-2.5/NOPB.

Is LM4040DIZ-2.5/NOPB RoHS compliant and lead-free?

Yes, LM4040DIZ-2.5/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes "No Lead (Pb)-Free", confirming compliance with EU RoHS Directive 2011/65/EU and JEDEC JS-001 ESD standards. The TO-92 package uses matte tin lead finish, and the device meets TI's green chemistry and halogen-free material requirements as documented in the official LM4040-N product folder.