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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Texas Instruments LM4040D50QDBZR

Name: LM4040D50QDBZR
Brand: Texas Instruments
SKU: LM4040D50QDBZR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D50QDBZR

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: LM4040D50QDBZR.pdf

Description:: IC VREF SHUNT 1% SOT23-3

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Product details

Overview

LM4040D50QDBZR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 5.0 V output with ±1.0% initial accuracy (D grade), 150 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and operation across –40°C to 125°C. It serves as a stable voltage reference in high-accuracy analog signal chains for industrial sensing and automotive control modules.

For engineers reviewing the LM4040D50QDBZR datasheet, LM4040D50QDBZR pinout, LM4040D50QDBZR application, or LM4040D50QDBZR equivalent, key selection criteria include its extended temperature rating, low 45 μA minimum cathode current, stability with all capacitive loads, and SOT-23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The LM4040D50QDBZR operates as a two-terminal shunt reference, sinking cathode current (I_Z) to maintain a precise 5.0 V reverse breakdown voltage (V_Z) across its cathode-anode terminals. Its Zener-zap trimmed silicon design achieves D-grade tolerance without external components.

It features low dynamic impedance (≤1.1 Ω at 1 mA), thermal hysteresis of 0.08%, and long-term stability of 120 ppm over 1000 hours - enabling reliable performance in closed-loop feedback and calibration-critical systems where drift must remain bounded across thermal cycling and time.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.0 V nominal; provides stable reference for ADC/DAC biasing and sensor excitation circuits
Initial Accuracy	±1.0% max at 25°C; defines worst-case DC offset in precision measurement front-ends
Temp Coefficient	150 ppm/°C max; contributes ≤±0.75% error over –40°C to 125°C operating range
Min Cathode Current	45 μA typical; enables ultra-low-power operation in battery-powered field transmitters
Output Noise	35 μV_RMS (10 Hz–10 kHz); supports <16-bit effective resolution in high-dynamic-range data acquisition
Dynamic Impedance	≤1.1 Ω at 1 mA; minimizes load-induced voltage shift in varying-current applications
Operating Temp	–40°C to +125°C; qualified for under-hood automotive and industrial control environments

Pinout & Package

SOT-23-3 (DBZ) package: compact 2.92 mm × 1.30 mm footprint with gull-wing leads, optimized for automated assembly and thermal dissipation in dense layouts.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (Pin 1)	Shunt current input / voltage sense node	Connected to regulated supply rail; sinks I_Z to maintain V_Z = 5.0 V relative to anode
Anode (Pin 2)	Reference ground / common return	Typically tied to system ground; forms the 0 V reference point for V_Z measurement
NC (Pin 3)	No internal connection	Unused terminal; must be left floating or optionally tied to anode per EMI mitigation guidance

Key Features

Feature	Design Value
Stable with all capacitive loads	Eliminates need for output capacitor - simplifies layout and reduces BOM count in space-limited modules
Wide operating current range	45 μA to 15 mA cathode current support enables use from ultra-low-power sensors to higher-current reference buffers
Extended temperature qualification	–40°C to +125°C operation ensures reliability in automotive engine control units and industrial motor drives
Low wideband noise	35 μV_RMS noise floor preserves SNR in precision instrumentation amplifiers and sigma-delta ADC references
Fuse/Zener-zap trimming	Enables D-grade 1.0% tolerance without laser trimming - improves cost-performance balance for high-volume applications

Applications

Energy Infrastructure	Automotive Electronics
Use Scenario: High-voltage battery monitoring in grid-tied solar inverters and EV charging stations. IC Role / Device Role / Timing Role: Provides stable 5.0 V reference for isolated ADCs measuring DC-link voltage and cell stack voltages. Use Value: ±1.0% initial accuracy and 150 ppm/°C TC ensure <0.5% total measurement error across full operating temperature range.	Use Scenario: Reference for pressure and temperature sensors in engine control modules (ECMs). IC Role / Device Role / Timing Role: Supplies excitation voltage and ADC reference for analog sensor signal conditioning. Use Value: Stable 5.0 V output with 35 μV_RMS noise maintains sensor linearity and repeatability under thermal cycling.
Analog Input Module	Field Transmitter
Use Scenario: Modular 4–20 mA transmitter with integrated analog front-end for process automation. IC Role / Device Role / Timing Role: Precision reference for DAC-based current loop control and sensor signal scaling. Use Value: 45 μA min cathode current allows direct biasing from low-power microcontrollers, reducing standby power.	Use Scenario: Two-wire smart transmitter in hazardous industrial zones (e.g., oil & gas refineries). IC Role / Device Role / Timing Role: Shunt reference establishing accurate 5.0 V rail for HART modem and sensor interface ICs. Use Value: Stability with all capacitive loads eliminates output capacitor - critical for intrinsic safety compliance and board area reduction.

Energy Infrastructure

Automotive Electronics

Use Scenario: High-voltage battery monitoring in grid-tied solar inverters and EV charging stations.

IC Role / Device Role / Timing Role: Provides stable 5.0 V reference for isolated ADCs measuring DC-link voltage and cell stack voltages.

Use Value: ±1.0% initial accuracy and 150 ppm/°C TC ensure <0.5% total measurement error across full operating temperature range.

Use Scenario: Reference for pressure and temperature sensors in engine control modules (ECMs).

IC Role / Device Role / Timing Role: Supplies excitation voltage and ADC reference for analog sensor signal conditioning.

Use Value: Stable 5.0 V output with 35 μV_RMS noise maintains sensor linearity and repeatability under thermal cycling.

Analog Input Module

Field Transmitter

Use Scenario: Modular 4–20 mA transmitter with integrated analog front-end for process automation.

IC Role / Device Role / Timing Role: Precision reference for DAC-based current loop control and sensor signal scaling.

Use Value: 45 μA min cathode current allows direct biasing from low-power microcontrollers, reducing standby power.

Use Scenario: Two-wire smart transmitter in hazardous industrial zones (e.g., oil & gas refineries).

IC Role / Device Role / Timing Role: Shunt reference establishing accurate 5.0 V rail for HART modem and sensor interface ICs.

Use Value: Stability with all capacitive loads eliminates output capacitor - critical for intrinsic safety compliance and board area reduction.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL4050C50IDBZR	Same 5.0 V output, ±0.5% initial accuracy (C grade), 100 ppm/°C TC, 35 μV_RMS noise, same SOT-23-3 package	Higher accuracy and lower TC suit metrology-grade instruments; requires tighter layout for ESD sensitivity	Select when ±0.5% tolerance and 100 ppm/°C TC are mandatory; verify ESD robustness in noisy environments
MAX6005EUR+T	5.0 V output, ±0.2% initial accuracy (B grade), 75 ppm/°C TC, 20 μV_RMS noise, SOT-23-3 package, 60 μA min cathode current	Lower noise and TC improve high-resolution data acquisition; slightly higher min current limits ultra-low-power use	Prefer for audio-grade or 24-bit ADC reference where sub-25 μV noise is critical; confirm 60 μA supply capability

Compared with TL4050C50IDBZR and MAX6005EUR+T, LM4040D50QDBZR offers the widest operating temperature range (–40°C to 125°C) and lowest minimum cathode current (45 μA), making it optimal for cost-sensitive, thermally demanding automotive and industrial applications where D-grade accuracy suffices.

Availability

LM4040D50QDBZR is available at Aetrix Electronics and suitable for energy infrastructure monitoring, automotive engine control, analog input modules, and field transmitter designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040D50QDBZR 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 and automotive-grade qualification.

The LM4040 series was engineered for high-accuracy, low-power shunt reference applications in industrial, automotive, and instrumentation systems - prioritizing thermal stability, noise performance, and ease of integration without external compensation.

FAQ

What is the maximum cathode current rating for LM4040D50QDBZR?

The absolute maximum cathode current for LM4040D50QDBZR is 25 mA, as specified in the Absolute Maximum Ratings table. However, the recommended operating condition specifies a maximum cathode current of 15 mA to ensure stable regulation and thermal reliability within the SOT-23-3 package's power dissipation limits. Exceeding 15 mA may elevate junction temperature beyond safe margins, especially at high ambient temperatures.

Does LM4040D50QDBZR require an output capacitor for stability?

No, LM4040D50QDBZR is inherently stable with all capacitive loads and does not require an external output capacitor. This is confirmed in both the Features list and the Description section of the datasheet. The device's internal design ensures phase margin retention across load capacitance variations, simplifying layout and eliminating capacitor-related aging or ESR concerns in long-life applications.

What is the thermal hysteresis specification for LM4040D50QDBZR?

The thermal hysteresis for LM4040D50QDBZR is 0.08%, defined as the voltage difference measured at 25°C after thermal cycling from –40°C versus after cycling from 125°C. This value is consistent across all LM4040 grades and packages, including the DBZ variant, and reflects minimal memory effect in the Zener structure - critical for repeatable calibration in field-deployed equipment.

Can LM4040D50QDBZR be used in automotive under-hood applications?

Yes, LM4040D50QDBZR is explicitly characterized for operation from –40°C to +125°C and carries the "Q" suffix denoting automotive-grade qualification per TI's internal standards. Its extended temperature range, 150 ppm/°C temperature coefficient, and robust construction make it suitable for under-hood engine control, transmission control, and battery management subsystems where ambient temperatures exceed 105°C.

How does the 45 μA minimum cathode current of LM4040D50QDBZR impact low-power system design?

The 45 μA typical minimum cathode current of LM4040D50QDBZR enables direct biasing from ultra-low-power microcontrollers or energy-harvesting sources without additional current-boosting circuitry. In sleep-mode sensor nodes, this allows the reference to remain active while consuming less than 0.23 mW (5 V × 45 μA), preserving battery life in wireless field transmitters and portable diagnostic tools.

LM4040D50QDBZR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 80µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 95 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4040D50QDBZR FAQ

1.How can I place an order for LM4040D50QDBZR through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D50QDBZR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM4040D50QDBZR reliable?

The price and inventory of LM4040D50QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D50QDBZR is usually 5 days.

3.What payment methods are accepted for LM4040D50QDBZR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D50QDBZR transactions.

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4.How is shipping managed for LM4040D50QDBZR?

LM4040D50QDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D50QDBZR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM4040D50QDBZR?

For technical support, including LM4040D50QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D50QDBZR requirements.

6.How does Aetrix verify that LM4040D50QDBZR is sourced from the original manufacturer or authorized distributors?

All LM4040D50QDBZR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM4040D50QDBZR meets industry standards.

7.What is the process for return or replacement of LM4040D50QDBZR?

All LM4040D50QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D50QDBZR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM4040D50QDBZR part is unused and in its original packaging.

Return procedure for LM4040D50QDBZR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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