Analog Devices Inc./Maxim Integrated LM4040BIM3-5.0+T

Overview

LM4040BIM3-5.0+T from Maxim Integrated is a precision 5.000V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±100ppm/°C temperature coefficient, and 60μA–15mA operating current range. It delivers stable reverse-breakdown voltage for analog-to-digital converter (ADC) reference, portable battery-powered instrumentation, and industrial sensor signal conditioning circuits.

For engineers reviewing the LM4040BIM3-5.0+T datasheet, LM4040BIM3-5.0+T pinout, LM4040BIM3-5.0+T application, or LM4040BIM3-5.0+T equivalent, key selection criteria include guaranteed -40°C to +85°C operation, no external capacitor requirement, low 80µVRMS wideband noise (10Hz–10kHz), and compatibility with capacitive loads in space-constrained designs.

Technical Context

The LM4040BIM3-5.0+T uses bandgap-based shunt architecture to maintain a precise 5.000V reverse breakdown voltage across its anode and cathode terminals. Its laser-trimmed internal resistors ensure 0.2% initial accuracy at +25°C, with temperature drift bounded by ±100ppm/°C over -40°C to +85°C.

It operates as a two-terminal device requiring only a series source resistor to regulate shunt current between 60μA and 15mA. With 0.5Ω typical dynamic impedance at 1mA and stability under any capacitive load, it eliminates need for output capacitance while supporting fast load-transient response (e.g., <90µs startup time at 5V).

Key Specifications

Pinout & Package

LM4040BIM3-5.0+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 unconnected (N.C.) and must remain floating or tied to pin 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBVR and ADR3450ARJZ-R7, the LM4040BIM3-5.0+T offers optimal balance of size (SC70), guaranteed 60μA start-up, and automotive-qualified variants-making it ideal for compact, battery-sensitive, and automotive-adjacent designs where fixed 5.0V and simplicity are prioritized.

Availability

LM4040BIM3-5.0+T is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor signal chains, and automotive body control modules requiring stable component supply, long-term parametric consistency, and RoHS-compliant sourcing.

Supply support for LM4040BIM3-5.0+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 industrial, medical, and communications applications.

The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, battery-operated, and high-reliability systems where stability, low noise, and minimal external components are critical.

FAQ

What is the guaranteed operating temperature range for LM4040BIM3-5.0+T?

The LM4040BIM3-5.0+T is specified for operation from -40°C to +85°C. This grade (I-grade) is distinct from the E-grade (e.g., LM4040BEM3-5.0+T), which extends to +125°C. The datasheet guarantees all electrical parameters-including 5.000V output, 0.2% accuracy, and ±100ppm/°C tempco-within this industrial temperature range.

Does LM4040BIM3-5.0+T require an external output capacitor?

No, LM4040BIM3-5.0+T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference inputs or op-amp feedback networks. This eliminates BOM cost, board area, and potential phase-margin issues associated with capacitor selection and placement.

What is the purpose of Pin 3 (N.C.) on LM4040BIM3-5.0+T?

Pin 3 on LM4040BIM3-5.0+T is designated N.C. (No Connection) and has no internal function. Per the datasheet, it must be left unconnected or tied directly to Pin 2 (cathode). Connecting Pin 3 to any other net-or leaving it floating without tying to Pin 2-may compromise performance or reliability, as it is electrically isolated from the reference circuitry.

How does the 60μA minimum operating current of LM4040BIM3-5.0+T impact circuit design?

The 60μA minimum shunt current requirement dictates the maximum value of the series source resistor (RS) used to bias LM4040BIM3-5.0+T. For example, with a 5.5V supply and 5.0V reference, RS must be ≤8.33kΩ to guarantee ≥60μA at minimum supply voltage and maximum load current-ensuring regulation is maintained across all operating conditions.

Is LM4040BIM3-5.0+T suitable for automotive applications?

LM4040BIM3-5.0+T itself is rated for -40°C to +85°C and is not AEC-Q100 qualified. However, the same 5.0V B-grade device is available in automotive-qualified versions: LM4040BEM3-5.0+T (SOT23) and LM4040BEX3-5.0+T (SC70), both certified to AEC-Q100 Grade 1 (-40°C to +125°C). These alternatives provide identical electrical specs with automotive reliability validation.