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Diodes Incorporated LM4040B30QFTA
- Part No.:
- LM4040B30QFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B30QFTA.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,810
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Product details
Overview
LM4040B30QFTA from Diodes Incorporated is an AEC-Q100 qualified automotive-grade precision shunt voltage reference delivering a stable 3.0V output with ±0.2% initial tolerance at +25°C, 20ppm/°C max temperature coefficient over −40°C to +125°C, and operation across 60µA–15mA reverse current - used for ADC/DAC biasing, sensor excitation, and power supply monitoring in engine control units.
For engineers reviewing the LM4040B30QFTA datasheet, LM4040B30QFTA pinout, LM4040B30QFTA application, or LM4040B30QFTA equivalent, key selection criteria include automotive qualification status, SOT23 package thermal performance, low-noise (35µVRMS, 10Hz–10kHz), capacitive-load stability, and micropower operation down to 60µA.
Technical Context
The LM4040B30QFTA implements a bandgap-based shunt reference architecture optimized for high stability under varying load and temperature. It maintains regulation without requiring an output capacitor and tolerates wide capacitive loading without oscillation due to internal compensation.
Its dynamic output impedance is 0.9Ω at 1mA/120Hz, and long-term stability is 120ppm over 1000 hours at 100µA. Thermal hysteresis is limited to 0.08% across −40°C to +125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal reverse breakdown voltage at 100µA, enabling precise 3.0V system biasing |
| Initial Tolerance | ±0.2% at +25°C (B-grade), supporting high-accuracy analog signal chains |
| Temp Coefficient | ≤20ppm/°C (−40°C to +125°C), minimizing drift in under-hood automotive environments |
| Operating Current | 60µA to 15mA reverse current range, allowing ultra-low-power and high-current designs |
| Noise (10Hz–10kHz) | 35µVRMS, reducing quantization error in 12–16-bit data acquisition systems |
| Dynamic Impedance | 0.9Ω at 1mA/120Hz, ensuring minimal output perturbation during transient load changes |
| Long-Term Stability | 120ppm over 1000 hours, supporting reliable calibration retention in safety-critical modules |
Pinout & Package
SOT23-3 surface-mount package with die attached to pin 3; pin 3 must be left floating or tied to pin 2 per layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference cathode return path | Connected to system ground or low-impedance return; defines voltage reference node |
| Cathode (Pin 2) | Output voltage terminal | Delivers regulated 3.0V reverse breakdown voltage; connects to load and series resistor |
| NC / Die Attach (Pin 3) | Internal die substrate connection | Electrically tied to pin 2; must not be independently biased - leave floating or short to pin 2 |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable regulation with up to 1µF tantalum or ceramic load capacitance, simplifying PCB layout |
| AEC-Q100 qualified | Qualified for automotive applications with PPAP support and IATF 16949 manufacturing |
| Green SOT23 packaging | Lead-free, halogen-free, and antimony-free construction meeting RoHS 3 and automotive environmental standards |
| Low minimum operating current | 62µA typical at +25°C, enabling use in battery-backed or always-on vehicle subsystems |
| High ESD robustness | 4kV HBM rating ensures reliability during automated assembly and field service handling |
Applications
| Engine Control Unit (ECU) Reference | Automotive Cabin Sensor Interface |
|---|---|
Use Scenario: Providing stable 3.0V reference for oxygen sensor signal conditioning and fuel injection timing ADCs in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute scaling for analog front-end measurements. Use Value: Enables <±0.1% measurement accuracy over full automotive temperature range despite supply ripple and vibration-induced noise. |
Use Scenario: Biasing thermistor and humidity sensor bridges in HVAC control modules. IC Role / Device Role / Timing Role: Precision DC reference for ratiometric sensor excitation and ADC reference input. Use Value: Maintains <0.5°C temperature resolution and <3% RH accuracy across cabin ambient shifts from −40°C to +85°C. |
| ADAS Camera Power Monitoring | Infotainment System ADC Calibration |
Use Scenario: Monitoring 3.3V/5V rail integrity in surround-view camera power supplies using comparator threshold referencing. IC Role / Device Role / Timing Role: Stable voltage threshold generator for undervoltage lockout and fault detection circuits. Use Value: Delivers repeatable 3.0V trip point with <1.2mV variation across temperature, eliminating false camera resets. |
Use Scenario: Calibrating audio codec and touchscreen controller ADCs during factory programming of head units. IC Role / Device Role / Timing Role: Factory-trimmed reference source for one-time digital calibration routines. Use Value: Supports <12-bit linearity correction with <0.01% gain error drift over 10-year product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050B30QDBZR | ±0.2% tolerance, 50ppm/°C max tempco, 75µA min operating current | Higher tempco reduces accuracy in extended temperature zones; lower ESD rating (2kV HBM) | Acceptable where cost sensitivity outweighs under-hood thermal stability requirements |
| MAX6003BAUT30+T | ±0.2% tolerance, 25ppm/°C max tempco, 60µA min current, but only industrial grade (−40°C to +85°C) | Lacks AEC-Q100 qualification and extended +125°C operation | Restricted to non-safety-critical infotainment or body electronics outside engine bay |
Compared with TL4050B30QDBZR and MAX6003BAUT30+T, the LM4040B30QFTA uniquely combines AEC-Q100 qualification, 20ppm/°C tempco, and SOT23 footprint - making it the only option qualified for direct replacement in engine compartment voltage reference roles.
Availability
LM4040B30QFTA is available at Aetrix Electronics and suitable for automotive engine control, ADAS power monitoring, and cabin sensor interface applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LM4040B30QFTA 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The LM4040Q series belongs to Diodes' automotive-qualified precision reference family, designed specifically to replace legacy LM4040 in safety-critical vehicle subsystems while meeting AEC-Q100 Grade 1 requirements.
FAQ
What is the maximum reverse current the LM4040B30QFTA can safely handle?
The LM4040B30QFTA has an absolute maximum continuous reverse current rating of 20mA. However, its recommended operating range is 60µA to 15mA per datasheet specifications. Exceeding 15mA risks exceeding the 330mW power dissipation limit in SOT23 at elevated ambient temperatures, potentially degrading long-term stability or causing thermal shutdown in poorly heatsinked layouts.
Can the LM4040B30QFTA be used with ceramic output capacitors?
Yes - the LM4040B30QFTA is explicitly characterized for stability with ceramic, tantalum, and electrolytic capacitors up to 1µF. Its internal compensation eliminates the need for series resistance or damping networks, unlike many older shunt references. Layout best practice requires keeping capacitor leads short and placing it adjacent to pins 2 and 1 to minimize parasitic inductance.
Is pin 3 of the SOT23 package electrically isolated?
No - pin 3 is internally connected to the silicon die substrate and forms a low-impedance bond to pin 2 (cathode). Per Diodes' datasheet, pin 3 must either be left unconnected (floating) or shorted directly to pin 2 on the PCB. Connecting pin 3 to any other potential - including ground or separate bias nodes - violates the device's internal structure and may cause regulation failure or parametric shift.
How does the LM4040B30QFTA's long-term stability compare to commercial-grade variants?
The LM4040B30QFTA specifies 120ppm non-cumulative drift over 1000 hours at 100µA, identical to the commercial LM4040B30. The automotive qualification adds rigorous preconditioning (temperature cycling, HTOL, ESD stress), but does not alter the intrinsic bandgap aging mechanism. Its stability advantage lies in tighter lot-to-lot control and traceable wafer-level screening - critical for zero-defect automotive manufacturing.
LM4040B30QFTA 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):
- 3V
- 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:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040B30QFTA FAQ
1.How can I place an order for LM4040B30QFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B30QFTA 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 LM4040B30QFTA reliable?
The price and inventory of LM4040B30QFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B30QFTA is usually 5 days.
3.What payment methods are accepted for LM4040B30QFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B30QFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B30QFTA?
LM4040B30QFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B30QFTA 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 LM4040B30QFTA?
For technical support, including LM4040B30QFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B30QFTA requirements.
6.How does Aetrix verify that LM4040B30QFTA is sourced from the original manufacturer or authorized distributors?
All LM4040B30QFTA 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 LM4040B30QFTA meets industry standards.
7.What is the process for return or replacement of LM4040B30QFTA?
All LM4040B30QFTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B30QFTA, 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 LM4040B30QFTA part is unused and in its original packaging.
Return procedure for LM4040B30QFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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