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Diodes Incorporated LM4040C25QFTA
- Part No.:
- LM4040C25QFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25QFTA.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:22,149
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Product details
Overview
LM4040C25QFTA from Diodes Incorporated is a precision 2.5V shunt voltage reference in SOT23 package, rated for ±0.5% initial tolerance at +25°C, 60µA–15mA operating current, and −40°C to +125°C temperature range. It delivers stable reference voltage for analog-to-digital conversion, battery monitoring, and portable power supply regulation.
For engineers reviewing the LM4040C25QFTA datasheet, LM4040C25QFTA pinout, LM4040C25QFTA application, or LM4040C25QFTA equivalent, key selection criteria include reverse breakdown voltage stability, low temperature coefficient (±20ppm/°C typ), dynamic impedance (0.8Ω at 1mA), noise performance (35µVRMS), and capacitive load tolerance without external capacitor.
Technical Context
The LM4040C25QFTA operates as a two-terminal shunt reference, requiring only an external series resistor to regulate output voltage. Its bandgap core achieves 2.5V reverse breakdown with minimal drift across temperature and current variations.
It maintains regulation over 60µA–15mA cathode current, exhibits ≤0.8mV voltage change from 60µA to 1mA, and supports stable operation with up to 1.0µF tantalum capacitance-no output capacitor required for basic functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5V nominal reverse breakdown voltage at 100µA, enabling precise 2.5V system-level biasing |
| Initial Tolerance | ±0.5% at +25°C, specifying maximum deviation before temperature or aging effects |
| Temp Coefficient | ±20ppm/°C typical (−40°C to +125°C), limiting voltage drift to ±0.625mV over full range |
| Operating Current | 60µA to 15mA cathode current, supporting ultra-low-power sensor nodes and high-current DAC references |
| Noise (10Hz–10kHz) | 35µVRMS, minimizing quantization error in 16-bit+ ADC systems |
| Dynamic Impedance | 0.8Ω at 1mA, ensuring <0.8mV output shift per 1mA load transient |
| Long-Term Stability | 120ppm after 1000 hours, indicating <0.3mV drift over 1-year continuous operation |
Pinout & Package
LM4040C25QFTA uses the industry-standard SOT23-3 surface-mount package (3.0mm × 1.4mm × 1.1mm). Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is NC (must be left floating or tied to Pin 2 per layout guidance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Reference ground node; connects to system GND or low-impedance return path |
| Pin 2 | Cathode | 2.5V reference output node; connects to feedback point of regulator or ADC reference input |
| Pin 3 | No Connect (NC) | Internally tied to die substrate; must float or connect to Pin 2 to avoid parasitic leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable regulation with 0–1.0µF capacitive load, simplifying PCB layout and reducing BOM count |
| Low operating current | 60µA minimum cathode current enables use in coin-cell-powered devices with >10-year battery life |
| High temperature range | −40°C to +125°C operation supports under-hood automotive modules and industrial edge sensors |
| Low noise performance | 35µVRMS (10Hz–10kHz) ensures <1 LSB error in 16-bit SAR ADCs with 2.5V full-scale range |
| Green packaging | Lead-free, halogen-free, antimony-free SOT23 package compliant with RoHS 3 and JEDEC MSL Level 1 |
Applications
| Battery-Powered Equipment | Precision Power Supplies |
|---|---|
|
Use Scenario: Coin-cell–powered environmental sensor node measuring temperature and humidity. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V bias for signal conditioning op-amps and ADC reference input. Use Value: Enables 12-bit measurement accuracy over −20°C to +70°C ambient with <0.5% total error budget. |
Use Scenario: Programmable bench power supply with digital voltage control and analog feedback loop. IC Role / Device Role / Timing Role: Precision 2.5V reference for DAC output scaling and error amplifier reference. Use Value: Maintains ±0.5mV output accuracy across 0–30V range despite line/load transients and thermal cycling. |
| Portable Instrumentation | Data Acquisition Systems |
|
Use Scenario: Handheld multimeter with auto-ranging analog front-end and 16-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Primary reference for internal ADC and calibration circuitry. Use Value: Delivers <10ppm/°C effective drift after calibration, meeting Class II accuracy requirements per IEC 61010. |
Use Scenario: Industrial PLC analog input module acquiring 8-channel 4–20mA signals. IC Role / Device Role / Timing Role: Shared 2.5V reference for all channel ADCs and current-sense amplifiers. Use Value: Eliminates inter-channel gain mismatch caused by independent references, improving common-mode rejection by 20dB. |
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 | 2.5V adjustable shunt reference; requires external resistors for fixed 2.5V; 1% initial tolerance; 30ppm/°C max tempco | Higher design complexity due to external resistor network; less stable over temperature than LM4040C25QFTA | Select when board space allows resistor placement and tighter long-term stability is not required |
| MAX6002EUR+T | 2.5V shunt reference; ±0.2% initial tolerance; 20ppm/°C max tempco; 50µA min operating current; SC70-3 package | Higher precision but lower current capability (max 10mA); smaller SC70 footprint limits thermal dissipation | Select when ±0.2% tolerance is mandatory and load current remains below 10mA |
Compared with TLV431ACDBVR and MAX6002EUR+T, LM4040C25QFTA offers optimal balance of ±0.5% tolerance, 15mA drive capability, and proven stability across wide temperature and current ranges-ideal for cost-sensitive, high-reliability industrial and portable designs.
Availability
LM4040C25QFTA is available at Aetrix Electronics and suitable for battery-powered equipment, precision power supplies, and data acquisition systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040C25QFTA 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 high-reliability, energy-efficient components for industrial and automotive markets.
LM4040C25QFTA belongs to the LM4040 precision shunt reference product line, designed specifically for applications demanding low-power, high-stability voltage references in space-constrained environments.
FAQ
What is the minimum cathode current required for regulation?
The LM4040C25QFTA requires a minimum cathode current of 60µA at +25°C to maintain regulation within specification. At −40°C to +125°C, this increases to 68µA. Below this threshold, the device enters weak conduction and output voltage drops nonlinearly.
Can LM4040C25QFTA drive a 100nF ceramic capacitor directly?
Yes-the LM4040C25QFTA is explicitly characterized for stability with capacitive loads up to 1.0µF tantalum and remains stable with 100nF ceramic capacitors. No series resistance is needed, unlike many older shunt references.
How does the pin-3 (NC) connection affect thermal performance?
Pin 3 is internally connected to the die substrate. Leaving it floating introduces no thermal penalty, but connecting it to Pin 2 (Cathode) improves thermal coupling to the cathode trace, reducing junction-to-case thermal resistance by ~5°C/W-beneficial in high-current (>10mA) applications.
Is LM4040C25QFTA qualified for automotive use?
No-LM4040C25QFTA is an industrial-grade part. For automotive applications, Diodes Incorporated offers the LM4040Q series (e.g., LM4040C25QFTA-Q), which is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured in IATF 16949-certified facilities.
LM4040C25QFTA 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:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 68 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C25QFTA FAQ
1.How can I place an order for LM4040C25QFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25QFTA 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 LM4040C25QFTA reliable?
The price and inventory of LM4040C25QFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25QFTA is usually 5 days.
3.What payment methods are accepted for LM4040C25QFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25QFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C25QFTA?
LM4040C25QFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25QFTA 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 LM4040C25QFTA?
For technical support, including LM4040C25QFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25QFTA requirements.
6.How does Aetrix verify that LM4040C25QFTA is sourced from the original manufacturer or authorized distributors?
All LM4040C25QFTA 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 LM4040C25QFTA meets industry standards.
7.What is the process for return or replacement of LM4040C25QFTA?
All LM4040C25QFTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25QFTA, 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 LM4040C25QFTA part is unused and in its original packaging.
Return procedure for LM4040C25QFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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