My Inquiry
My Account
Diodes Incorporated LM4040C25FTA
- Part No.:
- LM4040C25FTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C25FTA.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:307,833
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040C25FTA from Diodes Incorporated is a precision 2.5V shunt voltage reference in SOT23 package, rated for ±0.5% initial tolerance at +25°C, 60µA to 15mA operating current, and 100ppm/°C max temperature coefficient. It serves as a stable reference node in analog signal chains, ADC/DAC biasing, and battery-monitoring circuits where space-constrained PCBs demand micro-power operation.
For engineers reviewing the LM4040C25FTA datasheet, LM4040C25FTA pinout, LM4040C25FTA application, or LM4040C25FTA equivalent, key selection criteria include reverse breakdown voltage stability over temperature, low dynamic impedance (0.9Ω typ at 1mA), noise performance (35µVRMS, 10Hz–10kHz), and compatibility with capacitive loads without external compensation.
Technical Context
The LM4040C25FTA operates as a two-terminal shunt reference: cathode accepts reverse bias current while anode connects to system ground. Its bandgap core delivers 2.5V nominal output with guaranteed stability across -40°C to +125°C ambient and 60µA–15mA current range.
It exhibits low thermal hysteresis (0.08%), long-term stability (120ppm over 1000 hours), and minimal voltage drift versus load current (≤1.0mV change at IRMIN ≤ IR ≤ 1mA). Dynamic impedance remains below 1.1Ω up to 15mA, enabling fast transient response in feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal reverse breakdown voltage, tightly regulated for precision analog references |
| Initial Tolerance | ±0.5% at +25°C - enables accurate calibration without post-manufacture trimming |
| Temp Coefficient | ≤100ppm/°C (max) - ensures <±0.3125mV/°C drift over full industrial range |
| Operating Current | 60µA to 15mA - supports ultra-low-power sensor nodes and high-current reference buffers |
| Noise (10Hz–10kHz) | 35µVRMS - minimizes quantization error in 16-bit+ data acquisition systems |
| Dynamic Impedance | 0.9Ω typical at 1mA - maintains regulation during rapid load transients |
| Long-Term Stability | 120ppm over 1000 hours - reduces recalibration frequency in field-deployed instrumentation |
Pinout & Package
SOT23-3 surface-mount package with 2.4mm × 1.3mm footprint, 0.915mm height, and lead-free green molding. Die attach connects internally to pin 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 terminal | System ground connection point; establishes 0V reference for cathode voltage |
| Cathode (Pin 2) | Output/reference voltage terminal | Delivers stable 2.5V reverse-biased output; connects to series resistor and load |
| NC / Die Attach (Pin 3) | Internal die substrate connection | Must be left unconnected or shorted to pin 2; not functional as signal or power pin |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable operation with 0pF to ≥1µF capacitive loads - eliminates BOM cost and layout area for stabilization caps |
| Micro-power operation | 60µA minimum operating current - extends battery life in portable medical sensors and IoT endpoints |
| Wide temperature range | -40°C to +125°C operation - qualified for under-hood automotive modules and industrial PLC I/O stages |
| Low output noise | 35µVRMS (10Hz–10kHz) - preserves SNR in precision 24-bit delta-sigma ADC front-ends |
| RoHS & halogen-free | Fully lead-free, antimony-free, and <900ppm Br/Cl - meets IPC-1752a environmental compliance requirements |
Applications
| Battery Voltage Monitoring | Precision ADC Reference |
|---|---|
Use Scenario: Real-time monitoring of Li-ion cell voltage in handheld test equipment. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V基准 for ratiometric ADC measurement against battery rail. Use Value: Enables ±0.5% full-scale accuracy over -20°C to +60°C ambient without calibration, reducing firmware complexity. |
Use Scenario: Reference source for 16-bit SAR ADC in portable digital multimeter. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference ensuring consistent LSB resolution across temperature. Use Value: 35µVRMS noise limits quantization uncertainty to <0.002% of full scale, preserving effective resolution. |
| Portable Instrumentation Power Rail | Industrial Sensor Signal Conditioning |
Use Scenario: Biasing op-amp input stages in handheld oscilloscope front-end amplifiers. IC Role / Device Role / Timing Role: Stable 2.5V common-mode reference for differential amplifier DC offset control. Use Value: 100ppm/°C tempco limits offset drift to <±0.25mV over 0–70°C, maintaining measurement linearity. |
Use Scenario: Excitation reference for 350Ω strain gauge bridges in factory-floor load cells. IC Role / Device Role / Timing Role: Precision excitation voltage source for ratiometric bridge-to-digital conversion. Use Value: 0.08% thermal hysteresis prevents repeatability errors during cyclic temperature exposure in manufacturing 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 |
|---|---|---|---|
| TLV431ACDBVR | 2.5V adjustable shunt reference; requires external resistors to set output; 1% initial tolerance; 200ppm/°C max tempco | Higher design flexibility but increased component count and reduced accuracy vs. fixed 2.5V LM4040C25FTA | Choose when programmable reference voltage or tighter supply rejection (>60dB) is prioritized over absolute accuracy |
| MAX6002EUR+T | 2.5V shunt reference; ±0.2% initial tolerance; 75ppm/°C max tempco; 50µA min operating current | Higher precision and lower tempco, but limited availability and higher unit cost than LM4040C25FTA | Choose for metrology-grade applications requiring sub-0.3% total error budget over temperature |
Compared with TLV431ACDBVR and MAX6002EUR+T, the LM4040C25FTA offers optimal balance of fixed-voltage simplicity, industrial-grade temperature stability, and cost-effective SOT23 packaging-making it preferred for high-volume portable instrumentation and battery management systems where ±0.5% accuracy suffices.
Availability
LM4040C25FTA is available at Aetrix Electronics and suitable for battery-powered equipment, precision power supplies, and portable instrumentation requiring stable component supply with full traceability and lifecycle continuity.
Supply support for LM4040C25FTA 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 solutions, with emphasis on high-reliability, energy-efficient components for industrial and consumer markets.
The LM4040 series belongs to Diodes' precision analog portfolio, engineered specifically for space-constrained, low-power applications demanding stable voltage references without external compensation components.
FAQ
What is the minimum operating current for LM4040C25FTA at -40°C?
The LM4040C25FTA requires a minimum reverse current of 68µA at -40°C to maintain specified 2.5V output accuracy. This value is derived from the datasheet's "IRMIN" parameter under extended temperature conditions and ensures regulation stability even in cold-environment deployments like outdoor sensor nodes.
Can LM4040C25FTA drive a 1µF tantalum capacitor directly?
Yes - the LM4040C25FTA is explicitly designed for unconditional stability with capacitive loads up to and exceeding 1µF tantalum. Its internal architecture eliminates the need for series resistance or external compensation, simplifying layout in data acquisition front-ends where bulk capacitance is used for noise filtering.
How does the pin 3 connection affect PCB layout?
Pin 3 in the SOT23 package is electrically tied to the die substrate and must either remain unconnected or be shorted to pin 2 (cathode). Incorrect routing-such as connecting pin 3 to ground or leaving it floating without verifying isolation-can cause leakage paths or thermal coupling that degrades voltage accuracy and long-term stability.
Is LM4040C25FTA suitable for automotive applications?
The standard LM4040C25FTA is not AEC-Q100 qualified. For automotive use, Diodes offers the LM4040Q variant (e.g., LM4040Q25FTA), which undergoes additional stress testing and screening for under-hood environments. The C-grade part is rated for industrial (-40°C to +125°C) but lacks automotive-specific qualification documentation.
LM4040C25FTA 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C25FTA FAQ
1.How can I place an order for LM4040C25FTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C25FTA 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 LM4040C25FTA reliable?
The price and inventory of LM4040C25FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C25FTA is usually 5 days.
3.What payment methods are accepted for LM4040C25FTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C25FTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C25FTA?
LM4040C25FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C25FTA 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 LM4040C25FTA?
For technical support, including LM4040C25FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C25FTA requirements.
6.How does Aetrix verify that LM4040C25FTA is sourced from the original manufacturer or authorized distributors?
All LM4040C25FTA 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 LM4040C25FTA meets industry standards.
7.What is the process for return or replacement of LM4040C25FTA?
All LM4040C25FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C25FTA, 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 LM4040C25FTA part is unused and in its original packaging.
Return procedure for LM4040C25FTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C25FTA Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
