Texas Instruments LM4040BIM3X-10

Overview

LM4040BIM3X-10 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a stable 10.0 V reverse breakdown voltage with ±0.2% initial tolerance (B-grade) at 25°C, 100 ppm/°C max temperature coefficient, and 35 μV_RMS wideband noise (10 Hz–10 kHz). It operates from 100 μA to 15 mA cathode current and supports industrial temperature range (−40°C to +85°C), enabling use in high-accuracy ADC/DAC biasing and portable energy metering.

For engineers reviewing the LM4040BIM3X-10 datasheet, LM4040BIM3X-10 pinout, LM4040BIM3X-10 application, or LM4040BIM3X-10 equivalent, key selection criteria include its fixed 10 V output, SOT-23 footprint compatibility, low dynamic impedance (≤0.8 Ω), no-output-capacitor requirement, and AEC-Q100 Grade 3 qualification for automotive subsystems.

Technical Context

The LM4040BIM3X-10 implements a bandgap-based Zener-zap trimmed shunt reference architecture with curvature-corrected temperature drift compensation. Its internal fuse-trimmed Zener diode ensures tight initial accuracy without external trimming components.

It functions as a two-terminal device: cathode sinks current to regulate voltage across an external load resistor, while anode connects to system ground. Stability is maintained across capacitive loads up to 10 nF without requiring an output capacitor - a key differentiator from series references.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 0.95 mm height, gull-wing leads. RoHS-compliant, Pb-free, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050B10IDBZR and MAX6012BEUR+T, the LM4040BIM3X-10 offers the lowest noise and dynamic impedance among 10 V shunt references with AEC-Q100 Grade 3 support - making it optimal for automotive and high-resolution measurement systems where stability under varying load and temperature is critical.

Availability

LM4040BIM3X-10 is available at Aetrix Electronics and suitable for portable energy meters, industrial data acquisition systems, automotive cabin sensors, and precision audio biasing requiring stable component supply across production lifecycles.

Supply support for LM4040BIM3X-10 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 50 years of precision reference design heritage.

The LM4040-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and automotive applications demanding high initial accuracy, low drift, and robust capacitive-load stability.

FAQ

What is the maximum operating current for LM4040BIM3X-10?

The LM4040BIM3X-10 supports a maximum cathode current of 15 mA. This limit ensures safe power dissipation within the SOT-23 package's 306 mW rating at 25°C ambient. Exceeding 15 mA risks thermal overload and parametric shift; design must include a series current-limiting resistor sized to maintain IR ≤15 mA under worst-case supply and load conditions. The LM4040BIM3X-10 datasheet specifies this as an absolute maximum rating - not a recommended operating point.

Does LM4040BIM3X-10 require an external output capacitor?

No, the LM4040BIM3X-10 does not require an external output capacitor. Its internal architecture provides inherent stability with capacitive loads up to 10 nF, eliminating the need for added capacitance in most applications. This feature reduces bill-of-materials cost and PCB area - especially valuable in compact designs like wearable sensors and handheld test equipment. The LM4040BIM3X-10 maintains regulation even when driving ADC sample-and-hold inputs directly, unlike many older shunt references.

What is the temperature coefficient specification for LM4040BIM3X-10?

The LM4040BIM3X-10 has a maximum average temperature coefficient of 100 ppm/°C over the industrial temperature range (−40°C to +85°C). This means its 10.0 V output may drift up to ±0.65 V across the full range - a 0.065% change. The coefficient is measured between 25°C and extremes, using the formula ΔV_R/ΔT = (V_R(T) − V_R(25°C)) / (T − 25) × 10⁶. This value is guaranteed for B-grade devices and confirmed in TI's Electrical Characteristics table (Section 6.21).

Is LM4040BIM3X-10 qualified for automotive applications?

Yes, the LM4040BIM3X-10 is AEC-Q100 Grade 3 qualified (−40°C to +85°C), making it suitable for non-safety-critical automotive cabin electronics such as infotainment power monitoring, HVAC sensor interfaces, and body control module voltage supervision. It meets stress testing requirements including temperature cycling, humidity bias, and ESD (±2000 V HBM). The LM4040BIM3X-10 is explicitly listed in TI's automotive-grade orderable addendum and carries the "-Q1" suffix variant (LM4040BIM3X-10Q1) for full automotive traceability.

How does the LM4040BIM3X-10 achieve ±0.2% initial accuracy?

The LM4040BIM3X-10 achieves ±0.2% initial accuracy at 25°C through wafer-level Zener-zap trimming combined with laser-fuse calibration during final test. This process adjusts the breakdown voltage of the bandgap-Zener hybrid structure to fall within ±20 mV of 10.0 V. Each unit undergoes 100% production testing at 25°C per TI's Electrical Characteristics table (Section 6.21), and the B-grade designation confirms this tolerance is guaranteed - not typical. The LM4040BIM3X-10's accuracy is maintained across current and temperature via curvature-compensated design.