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Diodes Incorporated LM4040B25FTA
- Part No.:
- LM4040B25FTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B25FTA.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:39,625
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Product details
Overview
LM4040B25FTA from Diodes Incorporated is a precision 2.5V shunt voltage reference in SOT23 package, featuring ±0.2% initial tolerance at +25°C, 20ppm/°C max temperature coefficient over –40°C to +125°C, and stable operation from 60µA to 15mA reverse current. It serves as a compact, low-noise (45µVRMS, 10Hz–10kHz) reference for analog-to-digital converters and portable power monitoring circuits.
For engineers reviewing the LM4040B25FTA datasheet, LM4040B25FTA pinout, LM4040B25FTA application, or LM4040B25FTA equivalent, key selection criteria include initial accuracy, thermal drift, minimum operating current (60µA), dynamic impedance (0.8Ω at 1mA), and capacitive load tolerance in space-constrained battery-powered systems.
Technical Context
The LM4040B25FTA operates as a two-terminal bandgap shunt reference, requiring only an external series resistor to regulate output voltage. Its internal architecture maintains regulation across wide current (60µA–15mA) and temperature (–40°C to +125°C) ranges without external capacitors.
It delivers 2.5V nominal reverse breakdown voltage with ±5mV (±0.2%) tolerance at +25°C, <1.0mV drift over –40°C to +85°C, and <1.2mV drift over full temperature range - enabling high-accuracy feedback in precision LDOs and sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.5V nominal reverse breakdown voltage; sets precise bias point for ADC references and voltage monitors. |
| Initial Tolerance | ±0.2% at +25°C (±5mV); enables single-point calibration in production test for 12-bit+ system accuracy. |
| Temp Coefficient | 20ppm/°C max (–40°C to +125°C); contributes ≤±0.75mV total drift across industrial temperature range. |
| Operating Current | 60µA to 15mA reverse current; supports ultra-low-power sensor nodes and high-current precision supplies. |
| Noise (10Hz–10kHz) | 45µVRMS; limits quantization error in 16-bit SAR ADCs with ≥90dB SNR requirements. |
| Dynamic Impedance | 0.8Ω at 1mA; ensures minimal load-induced voltage shift during transient current steps in feedback loops. |
| Long-Term Stability | 120ppm after 1000 hours; guarantees <0.3mV output drift over 1-year field deployment. |
Pinout & Package
SOT23-3 package with die attached to pin 3; pin 3 must be left floating or connected to pin 2 per layout guidelines. Pin 2 must be left floating or connected to pin 1. No SC70-5 variant is active - only SOT23 is in full production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Common return path for shunt current; must connect to system ground plane with low-inductance trace. |
| Cathode (Pin 2) | Output voltage terminal | Provides regulated 2.5V; connects to feedback node of regulator or ADC reference input. |
| NC / Die Attach (Pin 3) | Internal die connection | Electrically tied to pin 2; must float or short to pin 2 - never driven or loaded externally. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable regulation with >1µF capacitive loads; eliminates BOM cost and PCB area for decoupling caps. |
| Low minimum operating current | 60µA typical; enables use in micropower applications like coin-cell IoT sensors and wake-on-event circuits. |
| High temperature stability | 20ppm/°C max TC over –40°C to +125°C; meets industrial-grade accuracy without calibration. |
| Lead-free & RoHS compliant | Fully EU RoHS 2015/863/EU compliant; supports global environmental compliance without derating or special handling. |
| Green molding compound | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb); satisfies automotive and medical supply chain material declarations. |
Applications
| Battery-Powered Equipment | Precision Power Supplies |
|---|---|
Use Scenario: Voltage monitoring in lithium-ion battery fuel gauges with 1% SoC resolution. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V reference for coulomb counter ADC inputs. Use Value: Enables accurate state-of-charge estimation over full temperature and discharge cycle due to <1.2mV total drift and 60µA quiescent draw. | Use Scenario: Feedback reference in adjustable 3.3V/5V LDOs for FPGA core rails. IC Role / Device Role / Timing Role: Precision voltage setpoint source in closed-loop regulation circuitry. Use Value: Maintains ±0.5% output regulation across line/load/temperature with no external compensation components. |
| Portable Instrumentation | Data Acquisition Systems |
Use Scenario: Reference for handheld multimeter front-end ADCs measuring mV-level signals. IC Role / Device Role / Timing Role: Low-noise 2.5V reference for 16-bit sigma-delta ADC conversion. Use Value: 45µVRMS noise ensures ≥90dB SNR, supporting 100µV resolution without averaging or filtering. | Use Scenario: Calibration reference in modular DAQ modules for industrial process control. IC Role / Device Role / Timing Role: Stable voltage standard for periodic self-calibration routines. Use Value: 120ppm long-term stability allows 12-month calibration intervals without field recalibration. |
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; ±0.5% tolerance; 50ppm/°C tempco; requires external resistors for fixed output. | Higher initial error and drift; suitable where cost sensitivity outweighs precision needs. | Select when BOM flexibility and lower unit cost justify ±0.5% tolerance and added resistor count. |
| MAX6002ESA+ | 2.5V shunt reference; ±0.2% tolerance; 25ppm/°C tempco; 65µA min current; SO-8 package. | Larger footprint and higher thermal resistance; better for high-reliability but less space-constrained designs. | Select when SO-8 handling is preferred and thermal performance margin is needed over SOT23. |
Compared with TLV431ACDBVR and MAX6002ESA+, the LM4040B25FTA offers superior thermal stability (20ppm/°C vs. 25–50ppm/°C), lower minimum current (60µA vs. 65–70µA), and smallest footprint - making it optimal for miniaturized, high-accuracy, battery-operated systems.
Availability
LM4040B25FTA is available at Aetrix Electronics and suitable for battery-powered equipment, precision power supplies, and portable instrumentation requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4040B25FTA 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 for industrial, computing, consumer, and communications markets.
The LM4040 product line delivers precision shunt voltage references optimized for space-constrained, low-power, and high-stability applications - particularly where SOT23 integration, microamp operation, and industrial temperature range are critical.
FAQ
What is the minimum operating current for LM4040B25FTA?
The LM4040B25FTA requires a minimum reverse current of 60µA at +25°C to maintain regulation within specification. At –40°C to +125°C, this increases to 68µA. Operation below this threshold results in unregulated output voltage and increased temperature sensitivity.
Can LM4040B25FTA drive capacitive loads directly?
Yes - the LM4040B25FTA is designed for unconditional stability with capacitive loads up to at least 1µF, including tantalum and ceramic types. No series resistor or isolation capacitor is required, simplifying design and reducing component count in compact layouts.
How does the SOT23 pinout differ from obsolete SC70-5 variants?
The LM4040B25FTA uses SOT23-3 with pins 1 (Anode), 2 (Cathode), and 3 (NC/die attach). Unlike discontinued SC70-5 (H5) variants, SOT23 has no dedicated NC pin - pin 3 is internally connected to pin 2 and must be floated or shorted to pin 2 per layout rules.
Is LM4040B25FTA suitable for automotive applications?
No - LM4040B25FTA is not AEC-Q100 qualified. For automotive use, Diodes Incorporated offers the LM4040Q series (e.g., LM4040QB25FTA), which undergoes extended temperature stress testing, enhanced ESD protection, and automotive-specific reliability screening per AEC-Q100 Rev H.
LM4040B25FTA 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:
- ±0.2%
- 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
LM4040B25FTA FAQ
1.How can I place an order for LM4040B25FTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B25FTA 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 LM4040B25FTA reliable?
The price and inventory of LM4040B25FTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B25FTA is usually 5 days.
3.What payment methods are accepted for LM4040B25FTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B25FTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B25FTA?
LM4040B25FTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B25FTA 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 LM4040B25FTA?
For technical support, including LM4040B25FTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B25FTA requirements.
6.How does Aetrix verify that LM4040B25FTA is sourced from the original manufacturer or authorized distributors?
All LM4040B25FTA 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 LM4040B25FTA meets industry standards.
7.What is the process for return or replacement of LM4040B25FTA?
All LM4040B25FTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B25FTA, 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 LM4040B25FTA part is unused and in its original packaging.
Return procedure for LM4040B25FTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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