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Diodes Incorporated LM4040B25QFTA
- Part No.:
- LM4040B25QFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B25QFTA.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
LM4040B25QFTA from Diodes Incorporated is a 2.5V, ±0.2% initial tolerance, AEC-Q100 qualified shunt voltage reference in SOT23 package, operating from 60µA to 15mA with 20ppm/°C typical temperature coefficient and 35µVRMS noise (10Hz–10kHz), used for precision ADC/DAC biasing and sensor excitation in automotive powertrain control units.
For engineers reviewing the LM4040B25QFTA datasheet, LM4040B25QFTA pinout, LM4040B25QFTA application, or LM4040B25QFTA equivalent, key selection criteria include initial accuracy at +25°C, thermal stability over −40°C to +125°C, dynamic impedance below 0.8Ω at 1mA, capacitive load immunity, and AEC-Q100 qualification status for automotive deployment.
Technical Context
The LM4040B25QFTA implements a bandgap-based shunt reference architecture optimized for micropower operation and high stability across wide current and temperature ranges. It maintains regulation with reverse current from 60µA to 15mA and exhibits <0.8mV voltage change over −40°C to +125°C at 100µA test current.
Its design eliminates need for output capacitance while sustaining stability with up to 1µF tantalum load, and achieves 35µVRMS broadband noise due to low-noise bandgap core and optimized die layout. The SOT23 package integrates die attachment to pin 3, requiring pin 2 and pin 3 to be shorted or pin 3 left floating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5V nominal at 100µA, ±5mV (±0.2%) tolerance at +25°C |
| Tempco (max) | 100ppm/°C over −40°C to +125°C - ensures ≤±25mV drift in full automotive range |
| Operating Current | 60µA to 15mA - supports ultra-low-power sensor nodes and high-current DAC references |
| Noise (10Hz–10kHz) | 35µVRMS - enables high-resolution 16-bit+ data acquisition without external filtering |
| Dynamic Impedance | 0.8Ω at 1mA, 120Hz - minimizes load-induced voltage error in varying-current applications |
| Long-Term Stability | 120ppm (1000 hrs @ 100µA) - guarantees minimal calibration drift in safety-critical ECUs |
| Thermal Hysteresis | 0.08% - limits voltage shift after thermal cycling in under-hood environments |
Pinout & Package
SOT23-3 package with 2.4mm × 1.3mm footprint, 0.915mm body height, and matte tin-plated leads; die attached to pin 3, mandating electrical connection between pins 2 and 3 or leaving pin 3 floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink reference terminal | Connected to system ground; reverse-biased operation requires external series resistor to supply voltage |
| Cathode (Pin 2) | Output reference node | Provides stable 2.5V output; must be tied to pin 3 per mechanical construction |
| Tab / Die Attach (Pin 3) | Internal die thermal and electrical connection | Electrically identical to cathode (pin 2); must not be left unconnected or isolated |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable operation with 0–1µF capacitive loads eliminates BOM cost and board space for stabilization caps |
| AEC-Q100 qualified | Qualified to Grade 1 (−40°C to +125°C) with PPAP support and IATF 16949 manufacturing - meets automotive functional safety baseline |
| Low micropower start-up | Minimum operating current of 60µA at +25°C enables use in always-on battery-supplied modules |
| Green, RoHS-compliant packaging | Halogen- and antimony-free SOT23 with <900ppm Br/Cl and <1000ppm Sb - satisfies EU automotive chemical compliance mandates |
| ESD robustness | 4kV HBM rating - withstands handling and assembly stresses in automotive production lines |
Applications
| Engine Control Unit (ECU) Sensor Biasing | Automotive ADAS Camera Power Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature sensors (RTDs) and pressure transducers in engine management systems. IC Role / Device Role / Timing Role: Shunt reference supplying 2.5V bias with <±0.2% accuracy and <100ppm/°C drift to ensure sensor linearity across thermal soak cycles. Use Value: Enables sub-0.5% total measurement error in closed-loop fuel injection control without recalibration over vehicle lifetime. |
Use Scenario: Generating precision reference for analog front-end (AFE) of surround-view camera modules operating in ambient temperatures up to +105°C. IC Role / Device Role / Timing Role: Low-noise (35µVRMS), high-stability shunt reference for CCD/CMOS image sensor bias and ADC reference rails. Use Value: Maintains >72dB SNR in 12-bit image digitization despite under-hood thermal transients and EMI exposure. |
| EV Battery Management System (BMS) Cell Monitoring | Automotive Infotainment Audio Codec Reference |
Use Scenario: Supplying reference voltage to 16-channel analog multiplexers and delta-sigma ADCs monitoring individual Li-ion cell voltages. IC Role / Device Role / Timing Role: Micropower (60µA min) shunt reference enabling continuous cell voltage sampling during vehicle sleep mode. Use Value: Supports <10µA system-level quiescent current budget while maintaining ±1mV absolute reference accuracy per cell. |
Use Scenario: Delivering low-noise reference to stereo audio DACs and headphone amplifiers in head unit designs. IC Role / Device Role / Timing Role: 2.5V shunt reference with 35µVRMS noise floor and <0.8Ω dynamic impedance for jitter-free audio conversion. Use Value: Achieves THD+N <−95dB across 20Hz–20kHz without post-regulation filtering, reducing component count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050B25QDBZR | ±0.2% tolerance, 50ppm/°C max tempco, 40µVRMS noise, SOT23-3 | Higher tempco increases drift by ~30mV over −40°C to +125°C vs. LM4040B25QFTA's 25mV | Acceptable for cabin electronics but not powertrain due to reduced thermal margin |
| MAX6002BESA+ | ±0.2% tolerance, 75ppm/°C max tempco, 50µVRMS noise, SO-8 | Larger SO-8 package occupies 3× board area; higher noise degrades 16-bit ADC ENOB | Only suitable where space and noise constraints are relaxed, e.g., non-safety infotainment subsystems |
Compared with TL4050B25QDBZR and MAX6002BESA+, the LM4040B25QFTA delivers superior thermal stability and lower noise in the smallest footprint, making it the optimal choice for AEC-Q100–mandated powertrain and ADAS applications where accuracy, size, and reliability are co-constrained.
Availability
LM4040B25QFTA is available at Aetrix Electronics and suitable for automotive powertrain control, ADAS sensor signal conditioning, and EV battery monitoring requiring stable component supply with full AEC-Q100 traceability and PPAP documentation.
Supply support for LM4040B25QFTA 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 automotive, industrial, and consumer markets, with ISO/TS 16949-certified facilities.
The LM4040Q series is part of Diodes' automotive-qualified precision reference portfolio, engineered specifically for AEC-Q100 Grade 1 operation in harsh-temperature engine bay and chassis applications.
FAQ
What is the minimum operating current for LM4040B25QFTA at −40°C?
The minimum operating current is 68µA at −40°C to +125°C per DS36989 Rev. 3-2, Table 1. This ensures reliable regulation under cold-start conditions in automotive environments, where supply voltage sag and sensor loading may reduce available current.
Can LM4040B25QFTA drive a 1000pF ceramic capacitor directly?
Yes - the device is explicitly characterized for stability with capacitive loads up to 1µF, including ceramic types. Its internal compensation and low dynamic impedance (0.8Ω) prevent oscillation even with 1000pF, eliminating need for series resistance or isolation.
How does the pin 2–pin 3 connection affect PCB layout?
Because the die is attached to pin 3, pins 2 and 3 are electrically common. Layout must either short them externally with a trace or leave pin 3 unconnected (floating). Isolating pin 3 risks open-circuit failure and violates Diodes' recommended land pattern per package outline SOT23.
Is LM4040B25QFTA compatible with lead-free reflow profiles?
Yes - it is fully RoHS 3 compliant with matte tin plating and rated for moisture sensitivity level 1 (J-STD-020). The SOT23 package withstands peak reflow temperatures up to 260°C, supporting standard Pb-free soldering processes without delamination or parametric shift.
LM4040B25QFTA 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040B25QFTA FAQ
1.How can I place an order for LM4040B25QFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B25QFTA 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 LM4040B25QFTA reliable?
The price and inventory of LM4040B25QFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B25QFTA is usually 5 days.
3.What payment methods are accepted for LM4040B25QFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B25QFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B25QFTA?
LM4040B25QFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B25QFTA 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 LM4040B25QFTA?
For technical support, including LM4040B25QFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B25QFTA requirements.
6.How does Aetrix verify that LM4040B25QFTA is sourced from the original manufacturer or authorized distributors?
All LM4040B25QFTA 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 LM4040B25QFTA meets industry standards.
7.What is the process for return or replacement of LM4040B25QFTA?
All LM4040B25QFTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B25QFTA, 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 LM4040B25QFTA part is unused and in its original packaging.
Return procedure for LM4040B25QFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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