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

Diodes Incorporated LM4040C41FTA

Name: LM4040C41FTA
Brand: Diodes Incorporated
SKU: LM4040C41FTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040C41FTA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: LM4040C41FTA.pdf

Description:: IC VREF SHUNT 0.5% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:3,000

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Product details

Overview

LM4040C41FTA from Diodes Incorporated is a precision micropower shunt voltage reference delivering a nominal 4.096 V reverse breakdown voltage with ±0.5% 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 cathode current - used in automotive data acquisition systems for ADC biasing and sensor signal conditioning.

For engineers reviewing the LM4040C41FTA datasheet, LM4040C41FTA pinout, LM4040C41FTA application, or LM4040C41FTA equivalent, this page provides verified electrical parameters, SOT23 package layout guidance, AEC-Q100 qualification status, and automotive-grade stability metrics including thermal hysteresis (0.08%), long-term drift (120 ppm), and noise (64 µV_RMS, 10 Hz–10 kHz).

Technical Context

The LM4040C41FTA implements a bandgap-based shunt reference architecture optimized for low-current, high-stability operation in automotive environments. It maintains regulation without requiring an output capacitor and tolerates capacitive loads up to 1 µF while preserving stability.

Its dynamic output impedance is 1.0 Ω at 1 mA (120 Hz), and its reverse breakdown voltage exhibits only ±0.5 mV change over 1 mA to 15 mA cathode current variation at +25°C - enabling predictable performance in variable-load sensing circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	4.096 V nominal reverse breakdown voltage - matches standard 12-bit DAC/ADC full-scale reference points.
Initial Tolerance	±0.5% at +25°C - enables direct use in 10-bit measurement systems without trimming.
Temp Coefficient	≤100 ppm/°C (–40°C to +125°C) - ensures ≤±0.5% total voltage drift across full automotive temperature range.
Operating Current	60 µA to 15 mA cathode current - supports ultra-low-power sensor nodes and high-current analog front-ends.
Noise (10 Hz–10 kHz)	64 µV_RMS - limits added uncertainty to <0.16 LSB in 4.096 V-referenced 12-bit systems.
Long-Term Stability	120 ppm (1000 hrs, 100 µA) - guarantees minimal calibration drift over product lifetime.
Thermal Hysteresis	0.08% - minimizes repeatability error after thermal cycling in engine bay or ADAS modules.

Pinout & Package

The LM4040C41FTA is housed in a RoHS-compliant, halogen-free SOT23-3 package (JEDEC MO-178AA). Pin 3 (cathode) is internally connected to the die substrate and must be left floating or tied to pin 2 (anode); pin 1 is the cathode terminal for external connection.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Cathode	Main current input terminal; connects to series resistor and load return path in shunt regulator topology.
Pin 2	Anode	Reference ground node; forms the 0 V reference point for output voltage measurement.
Pin 3	Substrate Tie	Internally bonded to die backside; must be left unconnected or shorted to pin 2 - not used as independent terminal.

Key Features

Feature	Design Value
No output capacitor required	Stable regulation with 0–1 µF capacitive loading - eliminates BOM cost and board space for external stabilization.
AEC-Q100 qualified	Qualified per Grade 1 (–40°C to +125°C) with PPAP capability - meets automotive functional safety baseline requirements.
Low minimum operating current	60 µA typical at +25°C - enables use in always-on battery-powered modules (e.g., CAN wake-up circuits).
High ESD robustness	4 kV HBM rating - reduces risk of field failure during handling and assembly in automotive production lines.
Green packaging	Lead-free, halogen-free, antimony-free SOT23 - satisfies IATF 16949 environmental compliance mandates.

Applications

Automotive Engine Control Unit (ECU)

ADAS Camera Module Reference

Use Scenario: Provides stable 4.096 V reference for analog-to-digital conversion of throttle position, coolant temperature, and knock sensor signals.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise scaling for 12-bit ADC inputs in real-time engine control loops.

Use Value: Enables ±0.5% measurement accuracy across –40°C to +125°C ambient, meeting ISO 26262 ASIL-B signal integrity requirements.

Use Scenario: Supplies reference voltage to image signal processor (ISP) ADCs capturing high-dynamic-range video under varying junction temperatures.

IC Role / Device Role / Timing Role: Precision shunt reference maintaining ADC full-scale accuracy despite thermal gradients on camera PCBs.

Use Value: Limits reference-induced gain error to <0.1% over temperature, preserving pixel-level linearity in 12-bit RAW image pipelines.

Electric Power Steering (EPS) Sensor Interface

Automotive Battery Management System (BMS)

Use Scenario: References torque and motor current sensing circuits where microvolt-level offset stability impacts steering assist fidelity.

IC Role / Device Role / Timing Role: Low-noise (64 µV_RMS) shunt reference minimizing quantization uncertainty in differential amplifier feedback paths.

Use Value: Reduces torque estimation error to <0.2 N·m across full vehicle life, supporting ASIL-C functional safety goals.

Use Scenario: Supplies reference for cell voltage monitoring ICs measuring individual Li-ion cells in 12 V auxiliary battery packs.

IC Role / Device Role / Timing Role: Stable 4.096 V shunt reference enabling ±1 mV absolute cell voltage accuracy at 100 µA quiescent current.

Use Value: Supports accurate state-of-charge (SoC) estimation with <1% error over 10-year service life, even after thermal cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431ACDBVR	Adjustable 1.24–18 V output; 2% initial tolerance; higher 120 ppm/°C tempco; requires external resistors.	Used where programmable reference or wider voltage range is needed; less suitable for fixed 4.096 V precision systems.	Select only if design requires adjustable output or accepts reduced accuracy and stability.
MAX6008AEUR+T	Fixed 4.096 V; ±0.2% initial tolerance; 30 ppm/°C max tempco; SOT23-3; but not AEC-Q100 qualified.	Preferred for industrial or consumer applications needing tighter specs; lacks automotive qualification documentation.	Choose for non-automotive designs requiring higher precision; avoid where PPAP or IATF 16949 traceability is mandatory.

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM4040C41FTA uniquely combines AEC-Q100 Grade 1 qualification, fixed 4.096 V output, ±0.5% tolerance, and 100 ppm/°C tempco in a single-source automotive-qualified part - eliminating redesign risk in Tier 1 ECU and ADAS programs.

Availability

LM4040C41FTA is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, electric power steering interfaces, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4040C41FTA 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The LM4040Q series was developed specifically for automotive applications demanding AEC-Q100 qualification, PPAP readiness, and operation from –40°C to +125°C - targeting precision sensing, ADC referencing, and closed-loop control subsystems.

FAQ

What is the maximum cathode current the LM4040C41FTA can safely handle?

The LM4040C41FTA supports continuous cathode current up to 15 mA per its Recommended Operating Conditions. Absolute Maximum Ratings specify 20 mA continuous reverse current, but sustained operation above 15 mA risks exceeding the 330 mW power dissipation limit in SOT23 at elevated ambient temperatures.

Can the LM4040C41FTA be used without an output capacitor?

Yes - the LM4040C41FTA is explicitly designed for capacitor-free operation and remains stable with 0–1 µF capacitive loading. Its internal compensation eliminates need for external bypass capacitors, reducing BOM count and PCB area in space-constrained automotive modules.

How does the LM4040C41FTA's thermal hysteresis affect system calibration?

The LM4040C41FTA exhibits 0.08% thermal hysteresis over –40°C to +125°C cycling, translating to ≤3.3 mV voltage shift after repeated thermal excursions. This enables single-point factory calibration in most automotive applications without requiring re-trimming after environmental stress testing.

Is the LM4040C41FTA compatible with lead-free reflow profiles?

Yes - the LM4040C41FTA uses matte tin-plated leads compliant with J-STD-020 moisture sensitivity Level 1 and supports standard Pb-free reflow profiles (peak 260°C, 10-second dwell). Its SOT23 package has been validated for wave soldering with recommended land pattern extensions.

LM4040C41FTA 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:: ±0.5%

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

LM4040C41FTA FAQ

1.How can I place an order for LM4040C41FTA through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040C41FTA 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 LM4040C41FTA reliable?

The price and inventory of LM4040C41FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C41FTA is usually 5 days.

3.What payment methods are accepted for LM4040C41FTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C41FTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040C41FTA?

LM4040C41FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040C41FTA 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 LM4040C41FTA?

For technical support, including LM4040C41FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C41FTA requirements.

6.How does Aetrix verify that LM4040C41FTA is sourced from the original manufacturer or authorized distributors?

All LM4040C41FTA 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 LM4040C41FTA meets industry standards.

7.What is the process for return or replacement of LM4040C41FTA?

All LM4040C41FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C41FTA, 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 LM4040C41FTA part is unused and in its original packaging.

Return procedure for LM4040C41FTA:

1.Submit a request within 90 days.

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

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