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

Diodes Incorporated LM4040B41FTA

Name: LM4040B41FTA
Brand: Diodes Incorporated
SKU: LM4040B41FTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040B41FTA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: LM4040B41FTA.pdf

Description:: IC VREF SHUNT 0.2% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:2,995

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Product details

Overview

LM4040B41FTA from Diodes Incorporated is a precision micropower shunt voltage reference delivering 4.096 V ±0.2% at +25°C, with 30 ppm/°C max temperature coefficient over –40°C to +125°C, 64 µV_RMS noise (10 Hz–10 kHz), and stable operation from 83 µA to 15 mA reverse current - used in automotive data acquisition systems for ADC biasing and sensor signal conditioning.

For engineers reviewing the LM4040B41FTA datasheet, LM4040B41FTA pinout, LM4040B41FTA application, or LM4040B41FTA equivalent, key selection criteria include initial tolerance, thermal drift, noise performance, capacitive load stability, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The LM4040B41FTA operates as a two-terminal bandgap-based shunt reference, requiring only an external series resistor to regulate voltage across variable loads. Its design maintains regulation with no output capacitor needed and tolerates wide capacitive loading without oscillation.

It achieves precision via curvature-compensated bandgap core architecture, with dynamic impedance of 1.0 Ω at 1 mA and long-term stability of 120 ppm over 1000 hours - enabling high-accuracy analog front-ends in harsh automotive environments.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V ±8.2 mV at +25°C - enables direct interface with 12-bit SAR ADCs requiring exact 4.096 V full-scale reference.
Initial Tolerance	±0.2% (B-grade) - ensures ≤8.2 mV absolute error at room temperature for high-precision calibration circuits.
Temp Coefficient	≤30 ppm/°C (–40°C to +125°C) - limits worst-case drift to ±12.3 mV across full automotive temperature range.
Noise (10 Hz–10 kHz)	64 µV_RMS - contributes <0.016 LSB noise to 12-bit 4.096 V ADC systems.
Operating Current	83 µA to 15 mA - supports ultra-low-power sensor nodes and high-current reference buffering in same footprint.
Dynamic Impedance	1.0 Ω at 1 mA - minimizes load-induced voltage shift during transient current demand changes.
Long-Term Stability	120 ppm (1000 hrs) - guarantees reference accuracy retention in safety-critical automotive modules over time.

Pinout & Package

SOT23-3 package (JEDEC TO-236AB); die attached to pin 3, electrically connecting pins 2 and 3 - requires pin 3 to be left floating or tied to pin 2 per layout guidelines.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Reference ground return path	Must connect to system ground; forms current sink return for shunt operation.
Cathode (Pin 2)	Output voltage node	Provides regulated 4.096 V; connects to ADC REF+ or sensor excitation circuitry.
Tab / Die Attach (Pin 3)	Internal die substrate connection	Electrically tied to cathode (Pin 2); must not be independently biased - float or short to Pin 2.

Key Features

Feature	Design Value
No-output-capacitor operation	Stable under all capacitive loads up to 1 µF tantalum - eliminates BOM cost and PCB area for external stabilization.
AEC-Q100 qualified	Qualified to Grade 1 (–40°C to +125°C) with PPAP support - meets automotive functional safety baseline requirements.
Low minimum operating current	83 µA at +25°C - enables use in always-on battery-backed modules with sub-100 µA quiescent budgets.
Green, lead-free SOT23	Halogen- and antimony-free, RoHS 3 compliant - satisfies strict automotive environmental compliance mandates.
Thermal hysteresis	0.08% - ensures repeatable voltage output after thermal cycling, critical for calibration traceability.

Applications

Automotive Cabin Temperature Sensing

EV Battery Cell Monitoring

Use Scenario: High-accuracy NTC thermistor biasing in HVAC control units, operating continuously across –40°C to +85°C ambient.

IC Role / Device Role / Timing Role: Shunt reference providing stable 4.096 V excitation for ratiometric temperature measurement.

Use Value: Enables ±0.1°C temperature resolution using 12-bit ADC, with drift <±0.3°C over full life due to low TC and hysteresis.

Use Scenario: Reference for isolated delta-sigma ADCs measuring individual Li-ion cell voltages in 800 V battery packs.

IC Role / Device Role / Timing Role: Precision voltage reference for 16-bit isolation amplifier input stages in BMS front-end ICs.

Use Value: Maintains <±1 LSB error over –40°C to +125°C junction range, supporting ASIL-B diagnostic coverage.

ADAS Radar Signal Chain Calibration

Automotive Camera ISP Reference

Use Scenario: On-chip calibration of RF front-end gain blocks and IF amplifiers in 77 GHz radar transceivers.

IC Role / Device Role / Timing Role: Low-noise shunt reference supplying bias to programmable gain amplifiers and mixer LO paths.

Use Value: 64 µV_RMS noise prevents spurious sideband generation; stable output ensures consistent gain calibration across temperature.

Use Scenario: Reference for analog gamma correction DACs and white balance circuits in automotive-grade image signal processors.

IC Role / Device Role / Timing Role: Stable 4.096 V reference for 10-bit video DACs driving CCD/CMOS sensor analog bias rails.

Use Value: ±0.2% tolerance and <0.08% hysteresis prevent color channel drift between cold start and hot soak conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AQDBVRQ1	Adjustable output (2.5 V to 36 V), higher 100 µA min current, 90 ppm/°C max TC	Requires external resistors for 4.096 V setting; less precise for fixed-voltage use cases	Select when programmability or wider voltage range outweighs need for ±0.2% fixed accuracy
MAX6008BEUR+T	4.096 V fixed, ±0.5% C-grade, 75 ppm/°C max TC, 100 µA min current	Looser tolerance and higher drift reduce ADC effective resolution in demanding automotive sensing	Acceptable for cost-sensitive non-safety subsystems where ±0.5% and 75 ppm/°C meet spec

Compared with TLVH431AQDBVRQ1 and MAX6008BEUR+T, the LM4040B41FTA delivers superior fixed-voltage accuracy (±0.2%), lower temperature drift (30 ppm/°C), and lower noise (64 µV_RMS) - making it optimal for high-resolution automotive data acquisition where reference stability directly impacts functional safety metrics.

Availability

LM4040B41FTA is available at Aetrix Electronics and suitable for automotive cabin sensing, EV battery monitoring, ADAS radar calibration, and camera ISP reference applications requiring stable component supply, AEC-Q100 compliance, and long-term parametric consistency.

Supply support for LM4040B41FTA 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and products qualified to AEC-Q100 standards.

The LM4040Q series is part of Diodes' automotive-qualified precision analog portfolio, designed specifically for high-reliability voltage reference needs in engine control, powertrain, and ADAS systems operating across extended temperature ranges.

FAQ

What is the minimum operating current for LM4040B41FTA at –40°C?

The minimum operating current for LM4040B41FTA is 88 µA at –40°C, as specified in the Electrical Characteristics table for IR_MIN under "–40°C to +85°C" conditions. This ensures stable regulation even at cold-start temperatures in automotive environments.

Can LM4040B41FTA drive a 1 µF tantalum capacitor directly?

Yes - the LM4040B41FTA is explicitly designed for unconditional stability with capacitive loads up to 1 µF tantalum, as confirmed in the datasheet's "No Output Capacitor Required" feature and Application Information section. No series resistance or damping is needed.

Is pin 3 of the SOT23 package electrically isolated?

No - pin 3 is the internal die attach pad and is electrically connected to pin 2 (cathode) per the datasheet's PCB layout guidance. It must either be left floating or shorted to pin 2; independent biasing will cause malfunction or damage.

How does LM4040B41FTA's 64 µV_RMS noise impact a 12-bit ADC system?

With a 4.096 V full-scale range, each LSB equals 1 mV; 64 µV_RMS noise represents ~0.064 LSB RMS, contributing negligible quantization uncertainty and preserving >11.5 ENOB in well-designed signal chains - critical for automotive sensor accuracy requirements.

LM4040B41FTA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

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):: 4.1V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±0.2%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 64µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 88 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4040B41FTA FAQ

1.How can I place an order for LM4040B41FTA through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040B41FTA 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 LM4040B41FTA reliable?

The price and inventory of LM4040B41FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B41FTA is usually 5 days.

3.What payment methods are accepted for LM4040B41FTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B41FTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040B41FTA?

LM4040B41FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040B41FTA 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 LM4040B41FTA?

For technical support, including LM4040B41FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B41FTA requirements.

6.How does Aetrix verify that LM4040B41FTA is sourced from the original manufacturer or authorized distributors?

All LM4040B41FTA 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 LM4040B41FTA meets industry standards.

7.What is the process for return or replacement of LM4040B41FTA?

All LM4040B41FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B41FTA, 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 LM4040B41FTA part is unused and in its original packaging.

Return procedure for LM4040B41FTA:

1.Submit a request within 90 days.

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

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