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

Diodes Incorporated LM4040D25FTA

Name: LM4040D25FTA
Brand: Diodes Incorporated
SKU: LM4040D25FTA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM4040D25FTA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: LM4040D25FTA.pdf

Description:: IC VREF SHUNT 1% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:8,440

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Product details

Overview

LM4040D25FTA from Diodes Incorporated is a precision 2.5V shunt voltage reference in SOT23 package, rated for ±1% initial tolerance at +25°C, 100 ppm/°C max temperature coefficient, and stable operation from 60 µA to 15 mA reverse current. It serves as a compact, low-noise (45 µV_RMS, 10 Hz–10 kHz) reference in battery-powered analog signal chains and portable data acquisition systems.

For engineers reviewing the LM4040D25FTA datasheet, LM4040D25FTA pinout, LM4040D25FTA application, or LM4040D25FTA equivalent, key selection criteria include its guaranteed 60 µA minimum operating current, thermal hysteresis of 0.08%, long-term stability of 120 ppm over 1000 hours, and compatibility with capacitive loads without external compensation.

Technical Context

The LM4040D25FTA implements a bandgap-based shunt reference architecture optimized for micro-power operation and high stability across -40°C to +125°C ambient temperatures. Its internal design eliminates need for output capacitance while maintaining <1.2 Ω dynamic impedance at 1 mA and <10 mV total voltage drift over full temperature range.

It operates exclusively in reverse-bias mode with anode grounded and cathode connected to series resistor and load. Pin 3 (die attach pad) must be left floating or tied to pin 2 per layout guidance, ensuring thermal and electrical integrity in space-constrained PCBs.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V nominal; precisely regulated output under reverse bias, enabling accurate ADC/DAC biasing and sensor excitation.
Initial Tolerance	±1% at +25°C; defines maximum deviation before calibration, critical for untrimmed industrial sensor front-ends.
Temp Coefficient	≤100 ppm/°C (max); ensures ≤±0.3125 mV drift over -40°C to +125°C, supporting stable performance in automotive cabin modules.
Operating Current	60 µA to 15 mA; supports ultra-low-power IoT nodes (e.g., coin-cell sensors) and higher-current precision supplies alike.
Noise (10Hz–10kHz)	45 µV_RMS; limits quantization error in 16-bit+ data acquisition systems where reference noise dominates SNR.
Dynamic Impedance	1.1 Ω at 1 mA; minimizes load-induced voltage sag during transient current demands in mixed-signal SoC power domains.
Long-Term Stability	120 ppm (1000 hrs); guarantees minimal drift in field-deployed instrumentation requiring recalibration intervals >5 years.

Pinout & Package

SOT23-3 surface-mount package (3.0 × 1.4 × 1.0 mm), RoHS-compliant, lead-free, halogen-free. Die attached to pin 3; pin 3 must be left floating or connected to pin 2 per layout requirements.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Ground reference node	Connected directly to system ground plane; establishes common return path for reference current and load current.
Cathode (Pin 2)	Output/reference voltage node	Provides stable 2.5 V output; connects to series resistor (R_S) and load; must not be shorted to pin 3 unless explicitly intended.
Die Attach Pad (Pin 3)	Thermal & mechanical anchor	Electrically tied to die substrate; floating or bonded to pin 2 only-never used as signal terminal or ground path.

Key Features

Feature	Design Value
No external capacitor required	Stable regulation with up to 1 µF tantalum load capacitance, eliminating BOM cost and board area for decoupling.
Micro-power operation	60 µA minimum operating current enables use in always-on wake-up circuits and energy-harvesting nodes.
Wide temperature range	-40°C to +125°C operation supports deployment in under-hood automotive ECUs and industrial motor drives.
Low thermal hysteresis	0.08% hysteresis ensures repeatable voltage after thermal cycling-critical for metrology-grade calibration equipment.
Green packaging	Fully RoHS 3 compliant, antimony- and halogen-free molding compound meets stringent environmental compliance mandates.

Applications

Battery-Powered Sensors

Precision Data Acquisition

Use Scenario: Low-power gas sensor node powered by CR2032 coin cell, sampling every 10 seconds.

IC Role / Device Role / Timing Role: Shunt reference providing excitation voltage for bridge transducer and reference for 16-bit SAR ADC.

Use Value: 60 µA minimum current enables >5-year battery life; 45 µV_RMS noise preserves ENOB >14.5 bits.

Use Scenario: Portable handheld multimeter with auto-ranging analog front-end.

IC Role / Device Role / Timing Role: Primary voltage reference for dual-slope integrator and digital calibration offset correction.

Use Value: ±1% tolerance and 100 ppm/°C TC ensure accuracy within 0.1% over operating temperature without factory recalibration.

Portable Medical Monitors

Industrial PLC Analog Inputs

Use Scenario: Wearable ECG patch with integrated signal conditioning and Bluetooth LE telemetry.

IC Role / Device Role / Timing Role: Stable 2.5 V reference for op-amp gain stages and ADC reference rail in ultra-low-noise analog chain.

Use Value: 0.08% thermal hysteresis prevents baseline shift during skin-contact temperature fluctuations, improving waveform fidelity.

Use Scenario: DIN-rail mounted PLC module measuring 4–20 mA loop signals across 16 channels.

IC Role / Device Role / Timing Role: Shared reference source for all channel-specific PGA and ADC subsystems on single PCB.

Use Value: SOT23 footprint allows dense placement; 120 ppm long-term stability reduces annual calibration frequency in factory automation environments.

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; requires two external resistors; 2% initial tolerance; 90 ppm/°C TC.	Used where programmability justifies added component count and reduced accuracy; less suitable for fixed 2.5 V systems.	Select when output voltage flexibility outweighs tolerance and noise requirements.
REF3025AIDBZR	Series reference; 2.5 V fixed; ±0.2% tolerance; 50 ppm/°C TC; 50 µA quiescent current; requires output capacitor.	Preferred in low-noise, high-accuracy applications where supply headroom permits series topology and board space allows capacitor.	Choose for metrology-grade designs needing tighter tolerance and lower TC than LM4040D25FTA offers.

Compared with TLVH431ACDBVR, LM4040D25FTA delivers tighter fixed-voltage accuracy and lower noise without external programming components; versus REF3025AIDBZR, it trades 0.8% tolerance and higher TC for shunt topology simplicity, no capacitor requirement, and superior capacitive load immunity.

Availability

LM4040D25FTA is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial analog I/O modules requiring stable component supply with consistent parametric performance across production lots.

Supply support for LM4040D25FTA 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 emphasis on reliability, efficiency, and green manufacturing standards.

The LM4040 family targets precision analog applications demanding micro-power consumption, small footprint, and robust thermal performance-particularly in portable, automotive, and industrial sensing systems.

FAQ

What is the minimum operating current for LM4040D25FTA at -40°C?

The minimum operating current is 68 µA at -40°C to +125°C ambient, per Electrical Characteristics table. This ensures stable 2.5 V regulation even in extreme cold environments such as outdoor industrial sensors or automotive engine compartments.

Can LM4040D25FTA drive a 1 µF ceramic capacitor directly?

Yes-it is specifically designed to remain stable with capacitive loads up to 1 µF, including ceramic types, without requiring series resistance or isolation. This eliminates external compensation components and simplifies layout in space-constrained designs.

Is pin 3 electrically connected to the die in the SOT23 package?

Yes-pin 3 is the die attach pad and forms a direct thermal and electrical connection to the silicon substrate. Per datasheet guidance, it must be left floating or connected to pin 2 (cathode); it must never be used as a ground or signal terminal.

How does LM4040D25FTA compare to LM4040B25FTA in long-term stability?

Both grades specify 120 ppm long-term stability over 1000 hours at 100 µA, as this parameter is process-dependent and grade-independent. The primary difference lies in initial tolerance (±1% vs ±0.2%) and temperature coefficient (100 ppm/°C max vs 20 ppm/°C typ).

LM4040D25FTA 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):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 150ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 35µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 73 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

LM4040D25FTA FAQ

1.How can I place an order for LM4040D25FTA through Aetrix?

Please submit a Request for Quotation (RFQ) for LM4040D25FTA 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 LM4040D25FTA reliable?

The price and inventory of LM4040D25FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D25FTA is usually 5 days.

3.What payment methods are accepted for LM4040D25FTA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D25FTA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM4040D25FTA?

LM4040D25FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM4040D25FTA 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 LM4040D25FTA?

For technical support, including LM4040D25FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D25FTA requirements.

6.How does Aetrix verify that LM4040D25FTA is sourced from the original manufacturer or authorized distributors?

All LM4040D25FTA 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 LM4040D25FTA meets industry standards.

7.What is the process for return or replacement of LM4040D25FTA?

All LM4040D25FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D25FTA, 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 LM4040D25FTA part is unused and in its original packaging.

Return procedure for LM4040D25FTA:

1.Submit a request within 90 days.

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

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