Analog Devices Inc./Maxim Integrated LM4040DIX3-3.0+T

Overview

LM4040DIX3-3.0+T from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±150ppm/°C temperature coefficient over –40°C to +85°C, 60μA–15mA operating current range, and 1.1Ω dynamic impedance at 1mA. It serves as a stable reference in portable battery-powered systems where space and low quiescent current are critical.

For engineers reviewing the LM4040DIX3-3.0+T datasheet, LM4040DIX3-3.0+T pinout, LM4040DIX3-3.0+T application, or LM4040DIX3-3.0+T equivalent, key selection criteria include guaranteed reverse breakdown voltage tolerance (±30mV at +25°C), no-output-capacitor stability, ultra-small 1.8mm × 1.8mm footprint, and compatibility with capacitive loads in high-density PCB layouts.

Technical Context

The LM4040DIX3-3.0+T implements a bandgap-based shunt reference architecture, functioning like a precision zener diode with cathode-anode reverse bias operation. Its internal laser-trimmed resistor network ensures fixed 3.000V output without external components, while the SC70-3 package's thermal resistance (340°C/W on four-layer board) supports operation up to +85°C ambient.

It requires no output capacitor for stability and tolerates arbitrary capacitive loading-enabling direct use in ADC reference, sensor excitation, and power-supply feedback paths. The device draws only 60μA minimum shunt current and maintains regulation across 15mA max, with 45μVRMS wideband noise (10Hz–10kHz) and 120ppm long-term drift after 1000 hours.

Key Specifications

Pinout & Package

Package: SC70-3 (1.8mm × 1.8mm, 0.95mm height), RoHS-compliant, tape-and-reel delivery. Pin 3 is NC and must be left unconnected or tied to pin 2 per datasheet requirement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBVR and MAX6008AEUR+T, the LM4040DIX3-3.0+T offers the lowest BOM count (no external resistors), smallest footprint, and best cost-performance balance for fixed 3.0V reference needs in space-constrained industrial and portable designs-while trading off some accuracy and tempco for manufacturability and supply chain maturity.

Availability

LM4040DIX3-3.0+T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power management, and industrial process transmitters requiring stable component supply with consistent lead times and traceable sourcing.

Supply support for LM4040DIX3-3.0+T 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

Maxim Integrated designs precision analog and mixed-signal semiconductors for industrial, medical, and communications applications, emphasizing high reliability and small-form-factor solutions.

The LM4040 product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-temperature environments-targeting applications demanding stable reference voltages without external compensation.

FAQ

What is the guaranteed reverse breakdown voltage tolerance of LM4040DIX3-3.0+T at +25°C?

The LM4040DIX3-3.0+T has a guaranteed reverse breakdown voltage tolerance of ±30mV (±1.0%) at +25°C, corresponding to a 2.970V to 3.030V range. This specification is validated per Maxim's production test flow and applies to all units shipped in the D-grade (1.0% accuracy) variant. The LM4040DIX3-3.0+T maintains this tolerance across its rated temperature range when combined with its ±150ppm/°C temperature coefficient.

Can LM4040DIX3-3.0+T operate without an external output capacitor?

Yes, the LM4040DIX3-3.0+T is designed to be stable with no external output capacitor and remains stable across any capacitive load from 0 to ≥10µF. This eliminates the need for external decoupling components in most applications-including ADC references and sensor excitation circuits-reducing BOM count and layout complexity. The LM4040DIX3-3.0+T achieves this through internal compensation and low dynamic impedance (1.1Ω at 1mA).

What is the minimum shunt current required for LM4040DIX3-3.0+T to maintain regulation?

The LM4040DIX3-3.0+T requires a minimum shunt current of 60μA to maintain regulation across its full temperature range (–40°C to +85°C). Below this threshold, the device may not sustain its specified 3.000V output, leading to increased output impedance and voltage droop. The LM4040DIX3-3.0+T datasheet specifies IRMIN = 67μA typical at +25°C, but 60μA is the guaranteed minimum under worst-case conditions.

Is LM4040DIX3-3.0+T suitable for automotive applications?

The LM4040DIX3-3.0+T itself is rated for –40°C to +85°C and is not AEC-Q100 qualified. However, Maxim offers automotive-grade variants such as LM4040DEX3-3.0/V+T (same SC70-3 package, –40°C to +125°C, AEC-Q100 qualified). For non-automotive industrial or consumer applications operating within its temperature range, the LM4040DIX3-3.0+T is fully suitable-but automotive deployment requires the /V suffix variant.

How does the SC70-3 package of LM4040DIX3-3.0+T compare thermally to SOT23-3?

The SC70-3 package of LM4040DIX3-3.0+T has a junction-to-ambient thermal resistance (θJA) of 340.4°C/W on a four-layer board-slightly higher than the SOT23-3 variant's 336°C/W. This results in ~1.2°C higher junction temperature rise at identical power dissipation. However, the SC70-3's 50% smaller footprint (1.8mm × 1.8mm vs. 2.9mm × 1.6mm) makes it preferable for space-constrained designs where thermal margin remains sufficient, as confirmed by LM4040DIX3-3.0+T's 235mW power rating at +70°C.