Texas Instruments LM4040B50IDBZRG4

Overview

LM4040B50IDBZRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 5.0V output with ±0.2% initial accuracy (B grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current - used in high-accuracy analog input modules and data-acquisition systems.

For engineers reviewing the LM4040B50IDBZRG4 datasheet, LM4040B50IDBZRG4 pinout, LM4040B50IDBZRG4 application, or LM4040B50IDBZRG4 equivalent, key selection criteria include industrial-temperature-grade (–40°C to +85°C) performance, SOT-23-3 package compatibility, low-noise reference stability under capacitive loads, and tight tolerance across operating current range.

Technical Context

The LM4040B50IDBZRG4 operates as a two-terminal shunt reference, sinking cathode current to maintain precise 5.0V reverse breakdown voltage at the cathode terminal relative to anode ground. Its Zener-zap trimmed silicon design achieves B-grade accuracy without external components.

It features low dynamic impedance (≤0.8Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm over 1000 hours - enabling stable reference performance in portable and space-constrained industrial sensor signal chains where supply headroom is limited.

Key Specifications

Pinout & Package

LM4040B50IDBZRG4 is packaged in a 3-pin SOT-23 (DBZ) surface-mount package measuring 2.92mm × 1.30mm. The device uses a two-terminal shunt configuration with a third no-connect (NC) pin for mechanical stability and EMI mitigation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040C50IDBZR, LM4040B50IDBZRG4 delivers twice the initial accuracy for calibrated sensor interfaces; versus REF3050AIDBZR, it offers simpler two-terminal implementation and wider current range but trades off lower temperature coefficient and higher noise floor.

Availability

LM4040B50IDBZRG4 is available at Aetrix Electronics and suitable for industrial analog input modules, energy infrastructure monitoring systems, and field transmitter calibration equipment requiring stable component supply with guaranteed long-term sourcing.

Supply support for LM4040B50IDBZRG4 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 reference design.

The LM4040 family was developed for cost-effective, space-efficient shunt reference applications in portable instrumentation, industrial sensors, and data-acquisition systems demanding micropower operation and high accuracy without external components.

FAQ

What is the operating temperature range for LM4040B50IDBZRG4?

The LM4040B50IDBZRG4 is characterized for operation across the industrial temperature range of –40°C to +85°C. This specification is confirmed in Section 6.3 (Recommended Operating Conditions) and Table 6.16 (Electrical Characteristics) of the official Texas Instruments datasheet. The device maintains its ±0.2% initial accuracy and 100ppm/°C temperature coefficient across this full range, making LM4040B50IDBZRG4 suitable for deployment in factory automation and outdoor energy monitoring equipment.

Does LM4040B50IDBZRG4 require an output capacitor?

No, LM4040B50IDBZRG4 does not require an output capacitor. As stated in the Features section and Section 3 (Description) of the TI datasheet, the device is "stable with all capacitive loads" and "requires no external capacitors for operation." This two-terminal shunt architecture eliminates capacitor-related aging, leakage, and layout sensitivity - a key advantage of LM4040B50IDBZRG4 in space-constrained and high-reliability applications like portable calibrators and remote field transmitters.

What is the minimum cathode current needed for LM4040B50IDBZRG4 to regulate properly?

The minimum cathode current for LM4040B50IDBZRG4 is 45μA (typical) at 25°C, with a maximum of 80μA across the full –40°C to +85°C temperature range. This value is specified in Table 6.16 (LM4040A50I, LM4040B50I Electrical Characteristics) under I_Z,min. Maintaining ≥45μA ensures the device remains in regulation; below this threshold, LM4040B50IDBZRG4 exits breakdown and output voltage collapses. Designers must size the series resistor accordingly based on worst-case supply voltage and load conditions.

How does the pinout of LM4040B50IDBZRG4 differ from standard SOT-23 op-amps?

LM4040B50IDBZRG4 uses a non-standard SOT-23 pinout optimized for shunt operation: Pin 1 = Cathode, Pin 2 = Anode (ground), Pin 3 = NC (no connect). Unlike op-amps, there is no power supply or signal input pin - instead, LM4040B50IDBZRG4 functions as a two-terminal device where current flows into the cathode and out the anode. Pin 3 must either float or connect to the anode per TI's EMI mitigation guidance, distinguishing LM4040B50IDBZRG4 from conventional 3-pin active devices.

Is LM4040B50IDBZRG4 RoHS-compliant and lead-free?

Yes, LM4040B50IDBZRG4 is RoHS-compliant and lead-free. The "G4" suffix in the part number explicitly denotes TI's Green (RoHS-compliant, lead-free) packaging standard, as documented in TI's Packaging Information and Orderable Addendum. The SOT-23-3 (DBZ) package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), confirming full compliance with EU RoHS Directive 2011/65/EU and related environmental requirements for LM4040B50IDBZRG4.