Analog Devices Inc./Maxim Integrated LM4040BIX3-3.0+T

Overview

LM4040BIX3-3.0+T from Maxim Integrated is a precision 3.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±100ppm/°C temperature coefficient, and stable operation from -40°C to +85°C. It delivers low 45µV_RMS noise (10Hz–10kHz), 60µA–15mA shunt current range, and no external capacitor requirement-ideal for space-constrained analog sensing and ADC reference circuits.

For engineers reviewing the LM4040BIX3-3.0+T datasheet, LM4040BIX3-3.0+T pinout, LM4040BIX3-3.0+T application, or LM4040BIX3-3.0+T equivalent, key selection criteria include guaranteed reverse breakdown tolerance (±6.0mV at +25°C), dynamic impedance ≤0.8Ω at 1mA, long-term stability of 120ppm over 1000h, and AEC-Q100 qualification eligibility via /V variants.

Technical Context

The LM4040BIX3-3.0+T uses bandgap-based shunt regulation to maintain a precise 3.000V reverse breakdown voltage across its anode and cathode terminals. Its laser-trimmed internal resistor network ensures tight initial accuracy without external calibration.

It operates as a two-terminal device with no enable pin or reference output buffer-voltage regulation is achieved solely by sinking variable shunt current (60µA–15mA) through the cathode-to-anode path. Stability is maintained across capacitive loads up to 1µF and over full industrial temperature range without external compensation.

Key Specifications

Pinout & Package

The LM4040BIX3-3.0+T is housed in a RoHS-compliant 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23 equivalents. Pin 3 is internally unconnected and must be left floating 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 TL4050B30IDBZR and ADR3430ARJZ-R7, the LM4040BIX3-3.0+T offers optimal balance of SC70 size, 0.2% accuracy, 100ppm/°C tempco, and true two-terminal simplicity-making it ideal for compact, low-cost, high-stability shunt reference applications where enable control is unnecessary.

Availability

LM4040BIX3-3.0+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, automotive cabin sensors, and smart energy meters requiring stable component supply and long-term parametric consistency.

Supply support for LM4040BIX3-3.0+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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and medical applications.

The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained systems requiring stable, low-noise, capacitor-free reference sources across extended temperature ranges.

FAQ

What is the exact reverse breakdown voltage tolerance of LM4040BIX3-3.0+T at +25°C?

The LM4040BIX3-3.0+T has a guaranteed reverse breakdown voltage of 3.000V ±6.0mV at +25°C (Grade B, 0.2% accuracy). This corresponds to a min/max range of 2.994V to 3.006V under nominal test conditions, as specified in the Electrical Characteristics table for the 3.000V variant.

Can LM4040BIX3-3.0+T operate without an external capacitor?

Yes, the LM4040BIX3-3.0+T is inherently stable and does not require an external output capacitor. It remains stable with any capacitive load-including 0µF up to 1µF-as confirmed in the Applications Information section and Typical Operating Characteristics plots.

What is the minimum operating current for LM4040BIX3-3.0+T, and why is it critical?

The LM4040BIX3-3.0+T requires a minimum shunt current of 67µA (typical) to maintain regulation, with 60µA guaranteed across temperature. Falling below this threshold risks loss of reference accuracy and increased output impedance-critical for low-power sensor biasing where current budgets are tight.

Is LM4040BIX3-3.0+T qualified for automotive applications?

The base LM4040BIX3-3.0+T is not AEC-Q100 qualified, but Maxim offers automotive-grade variants (e.g., LM4040BEX3-3.0/V+T) with identical electrical specs and extended -40°C to +125°C operation. These /V parts undergo full AEC-Q100 stress testing and are marked accordingly.

How does the SC70-3 package of LM4040BIX3-3.0+T compare to SOT23-3 in thermal performance?

The SC70-3 package of LM4040BIX3-3.0+T has a junction-to-ambient thermal resistance (θ_JA) of 340.4°C/W on a four-layer board-slightly higher than SOT23-3 (336°C/W). However, its 50% smaller footprint makes it preferable for space-constrained designs where moderate power dissipation (<75mW) is managed via layout and copper area.