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

Diodes Incorporated LM4040D41FTA

Name: LM4040D41FTA
Brand: Diodes Incorporated
SKU: LM4040D41FTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D41FTA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: LM4040D41FTA.pdf

Description:: IC VREF SHUNT 1% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:2,527

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Product details

Overview

LM4040D41FTA from Diodes Incorporated is a precision micropower shunt voltage reference delivering 4.096 V nominal output with ±1% initial tolerance at +25°C, 100 ppm/°C max temperature coefficient over –40°C to +125°C, and stable operation across 60 µA to 15 mA reverse current. It serves as a high-accuracy reference in automotive sensor signal conditioning, ADC biasing, and battery monitoring circuits where space-constrained SOT23 packaging and AEC-Q100 qualification are required.

For engineers reviewing the LM4040D41FTA datasheet, LM4040D41FTA pinout, LM4040D41FTA application, or LM4040D41FTA equivalent, this device supports automotive-grade voltage referencing with verified thermal hysteresis (0.08%), low noise (64 µV_RMS), and no external capacitor requirement - critical for ECU power rail calibration and CAN transceiver reference stability.

Technical Context

The LM4040D41FTA implements a bandgap-based shunt architecture optimized for automotive environments, maintaining regulation without output capacitance and tolerating wide capacitive loading. Its dynamic impedance remains ≤1.3 Ω at 1 mA and 120 Hz, enabling stable feedback in precision analog front-ends.

It operates across –40°C to +125°C ambient with AEC-Q100 qualification, PPAP capability, and IATF 16949 manufacturing. The device exhibits 0.08% thermal hysteresis and 120 ppm long-term stability after 1000 hours at 100 µA, supporting mission-critical automotive data acquisition systems requiring repeatable reference accuracy over lifetime.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal at 100 µA reverse current - matches standard 12-bit DAC/ADC full-scale reference scaling.
Initial Tolerance	±1% at +25°C (D-grade) - enables cost-optimized calibration in non-safety-critical automotive subsystems.
Temp Coefficient	≤100 ppm/°C (–40°C to +125°C) - ensures ≤±0.5% total drift across full automotive temperature range.
Operating Current	60 µA to 15 mA reverse bias - supports ultra-low-power sleep modes and high-current transient response.
Noise (10Hz–10kHz)	64 µV_RMS - minimizes quantization error in 16-bit+ data converters used in ADAS sensors.
Dynamic Impedance	1.3 Ω at 1 mA, 120 Hz - maintains loop stability when driving op-amp reference inputs or SAR ADC sample-and-hold networks.
Thermal Hysteresis	0.08% - guarantees repeatability after thermal cycling in engine control modules and transmission controllers.

Pinout & Package

LM4040D41FTA uses the SOT23-3 package (JEDEC TO-236AB), with die attached to pin 3, creating an internal electrical connection between pins 2 and 3. Pin 3 must be left floating or tied to pin 2 per layout guidelines.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Reference ground node	Connected to system GND; defines 0 V reference point for reverse-biased operation.
Cathode (Pin 2)	Output voltage terminal	Delivers regulated 4.096 V when reverse-biased; connects to load and series resistor (R_S).
Tab / Die Attach (Pin 3)	Internal cathode tie	Electrically connected to pin 2; must not be independently biased - floating or shorted to pin 2 only.

Key Features

Feature	Design Value
No external capacitor required	Stable regulation with >1 µF capacitive loading - eliminates BOM cost and PCB area for decoupling in compact ECUs.
AEC-Q100 qualified	Qualified for automotive applications with PPAP support and IATF 16949 manufacturing - meets OEM Tier-1 supply chain requirements.
Low 64 µV_RMS noise	Enables <1 LSB error in 16-bit ADCs sampling at 100 kSPS - critical for high-resolution battery cell voltage monitoring.
Wide 60 µA–15 mA operating range	Supports both ultra-low-power wake-on-event circuits (<100 µA standby) and fast transient response in active mode.
Green SOT23 package	Halogen- and antimony-free, fully RoHS-compliant (≤900 ppm Br/Cl, ≤1000 ppm Sb) - satisfies EU automotive environmental mandates.

Applications

Engine Control Unit Reference

ADAS Camera Sensor Biasing

Use Scenario: Provides stable 4.096 V reference for analog front-end of knock sensor signal conditioning circuitry in gasoline direct injection engines.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC bias for instrumentation amplifier gain stages and anti-aliasing filters.

Use Value: Enables ±0.5% measurement accuracy over –40°C to +125°C ambient, meeting ISO 26262 ASIL-B functional safety requirements for closed-loop fuel control.

Use Scenario: Supplies reference voltage to column driver amplifiers and ADC reference inputs in 8-megapixel automotive surround-view camera modules.

IC Role / Device Role / Timing Role: Precision shunt reference ensuring consistent pixel gain calibration across temperature and supply variations.

Use Value: Reduces image sensor fixed-pattern noise by 40% versus generic references, improving low-light SNR for night-vision assist systems.

EV Battery Management System

Automotive CAN Transceiver Reference

Use Scenario: Delivers 4.096 V reference to 16-bit delta-sigma ADCs measuring individual Li-ion cell voltages in 400 V traction battery packs.

IC Role / Device Role / Timing Role: High-stability shunt reference enabling accurate cell voltage differential measurement with <1 mV resolution.

Use Value: Supports ±1 mV cell voltage accuracy over lifetime, extending battery pack service life by enabling precise state-of-charge estimation.

Use Scenario: Sets common-mode voltage for isolated CAN FD transceivers in domain controller gateways handling OTA update traffic.

IC Role / Device Role / Timing Role: Stable voltage reference defining logic threshold for CAN bus dominant/recessive detection circuitry.

Use Value: Prevents bit error rate degradation during cold cranking (6 V–16 V supply dips) due to guaranteed regulation down to 60 µA operating current.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV431ACDBVR	Adjustable 1.24–6 V output; 0.5% initial tolerance; higher 300 ppm/°C tempco; requires external resistors.	Used where programmable reference is needed; less suitable for fixed 4.096 V systems due to resistor tolerance stack-up.	Select TLV431ACDBVR only if design requires adjustable output or lower cost outweighs precision loss.
MAX6008AEUR+T	Fixed 4.096 V; 0.2% initial tolerance; 25 ppm/°C tempco; SOT23-3; not AEC-Q100 qualified.	Preferred for industrial test equipment; unsuitable for automotive production due to missing PPAP and qualification documentation.	Choose MAX6008AEUR+T for non-automotive applications demanding tighter initial tolerance and lower tempco.

Compared with TLV431ACDBVR and MAX6008AEUR+T, LM4040D41FTA uniquely balances automotive qualification, fixed 4.096 V accuracy, and SOT23 footprint - making it the only option that satisfies OEM production requirements without design rework or additional qualification effort.

Availability

LM4040D41FTA is available at Aetrix Electronics and suitable for automotive engine control units, battery management systems, ADAS camera modules, and CAN gateway designs requiring stable component supply under AEC-Q100 compliance and PPAP traceability.

Supply support for LM4040D41FTA 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 manufacturer specializing in discrete, analog, and mixed-signal devices, with core expertise in power management, signal integrity, and automotive-qualified components.

The LM4040Q series was designed specifically for automotive voltage reference applications requiring AEC-Q100 qualification, extended temperature operation, and high long-term stability - targeting ECU, BMS, and ADAS subsystems.

FAQ

What is the minimum operating current for LM4040D41FTA at –40°C?

The minimum operating current for LM4040D41FTA is 88 µA at –40°C to +125°C ambient, as specified in the Electrical Characteristics table for D-grade devices. This ensures stable regulation even in cold-start engine conditions where supply rails may sag and load currents vary significantly.

Can LM4040D41FTA drive a 10 nF capacitive load without oscillation?

Yes - the LM4040D41FTA is explicitly characterized for excellent stability with capacitive loads up to at least 1 µF, and its internal compensation ensures no oscillation with 10 nF loads. Diodes' datasheet confirms stable operation without external capacitor, making it robust for noisy automotive power domains.

Is pin 3 of the SOT23 package electrically isolated?

No - pin 3 is internally connected to the die attach pad and forms a low-impedance bond to pin 2 (cathode). Per Diodes' layout guidance, pin 3 must either be left floating or shorted to pin 2; independent biasing will cause malfunction or damage due to unintended current paths.

Does LM4040D41FTA meet RoHS 3 and halogen-free requirements?

Yes - LM4040D41FTA is fully RoHS 3 compliant (2015/863/EU), lead-free, and halogen- and antimony-free ("Green" per Diodes' definition): Br + Cl ≤ 1500 ppm total, Br ≤ 900 ppm, Cl ≤ 900 ppm, Sb ≤ 1000 ppm - verified per material declarations and manufacturing audits.

LM4040D41FTA 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:: ±1%

Temperature Coefficient:: 150ppm/°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

LM4040D41FTA FAQ

1.How can I place an order for LM4040D41FTA through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D41FTA 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 LM4040D41FTA reliable?

The price and inventory of LM4040D41FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D41FTA is usually 5 days.

3.What payment methods are accepted for LM4040D41FTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D41FTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040D41FTA?

LM4040D41FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D41FTA 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 LM4040D41FTA?

For technical support, including LM4040D41FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D41FTA requirements.

6.How does Aetrix verify that LM4040D41FTA is sourced from the original manufacturer or authorized distributors?

All LM4040D41FTA 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 LM4040D41FTA meets industry standards.

7.What is the process for return or replacement of LM4040D41FTA?

All LM4040D41FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D41FTA, 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 LM4040D41FTA part is unused and in its original packaging.

Return procedure for LM4040D41FTA:

1.Submit a request within 90 days.

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

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