My Inquiry
My Account
Diodes Incorporated LM4040D30QFTA
- Part No.:
- LM4040D30QFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040D30QFTA.pdf
- Description:
- IC VREF SHUNT 3V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,879
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040D30QFTA from Diodes Incorporated is a precision micropower shunt voltage reference delivering a nominal 3.0V reverse breakdown voltage with ±1% initial tolerance at +25°C, 100 ppm/°C max temperature coefficient over –40°C to +125°C, and stable operation across 60µA–15mA cathode current - deployed in automotive data acquisition systems for ADC biasing and sensor signal conditioning.
For engineers reviewing the LM4040D30QFTA datasheet, LM4040D30QFTA pinout, LM4040D30QFTA application, or LM4040D30QFTA equivalent, this page delivers verified electrical specs, SOT23 terminal mapping, AEC-Q100 qualification context, and direct automotive-grade alternatives - all extracted from Diodes' official DS36989 Rev. 3-2 datasheet.
Technical Context
The LM4040D30QFTA operates as a two-terminal bandgap-based shunt reference, requiring only an external series resistor to regulate voltage across variable loads. Its design maintains regulation with no output capacitor needed and tolerates capacitive loads up to 1.0µF without instability.
It achieves 35µVRMS noise (10Hz–10kHz) at 100µA cathode current, exhibits 0.08% thermal hysteresis over –40°C to +125°C, and sustains <1.3mV voltage drift across its full operating current range - enabling high-accuracy analog front-ends in harsh automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 3.0V nominal reverse breakdown voltage at 100µA cathode current - sets precise bias point for ADCs and comparators. |
| Initial Tolerance | ±1% at +25°C (D-grade) - defines worst-case offset error before temperature or aging effects. |
| Temp Coefficient | ≤100 ppm/°C over –40°C to +125°C - limits voltage drift to ±0.03V across full automotive ambient range. |
| Operating Current | 60µA to 15mA cathode current - supports ultra-low-power sensor nodes and high-current calibration circuits. |
| Noise (10Hz–10kHz) | 35µVRMS at 100µA - ensures minimal contribution to measurement uncertainty in 12-bit+ data acquisition. |
| Dynamic Impedance | ≤1.2Ω at 1mA, 120Hz - maintains tight regulation under dynamic load transients. |
| Long-Term Stability | 120ppm after 1000 hours - quantifies parametric shift during early-life burn-in and field operation. |
Pinout & Package
SOT23-3 package with die attached to Pin 3; Pin 3 must be left floating or tied to Pin 2 per Diodes' layout guidance (DS36989 p.12).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Connected to system GND; forms return path for cathode current and defines voltage reference baseline. |
| Cathode (Pin 2) | Output voltage node | Delivers regulated 3.0V relative to Anode; connects to load and external series resistor (RS). |
| Die Attach Pad (Pin 3) | Internal thermal & electrical tie | Electrically connected to Pin 2; must not be independently biased - floating or shorted to Pin 2 only. |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable regulation with 0–1.0µF capacitive load - eliminates BOM cost and PCB area for output filtering. |
| AEC-Q100 qualified | Qualified to Grade 1 (–40°C to +125°C) with PPAP capability - meets automotive functional safety baseline requirements. |
| Low 35µVRMS noise | Enables ≤0.001% RMS error contribution in 16-bit SAR ADC references at 100µA operating point. |
| Wide 60µA–15mA current range | Supports both battery-powered sensors (µA sleep mode) and active calibration circuits (mA-level sourcing). |
| Green SOT23 package | Halogen- and antimony-free, fully RoHS-compliant construction - satisfies Tier-1 automotive material declarations. |
Applications
| Automotive Engine Control Unit (ECU) Sensor Biasing | ADAS Camera Module Reference Supply |
|---|---|
Use Scenario: Providing stable 3.0V reference for oxygen sensor signal conditioning circuitry within engine control modules exposed to under-hood temperatures up to +125°C. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precision voltage baseline for op-amp gain stages and ADC input scaling. Use Value: ±1% initial tolerance and ≤100 ppm/°C TC ensure sensor output accuracy remains within ISO 26262 ASIL-B error budgets across thermal cycling. |
Use Scenario: Supplying reference voltage to high-speed image sensor ADCs in surround-view camera systems operating continuously at ambient temperatures from –40°C to +85°C. IC Role / Device Role / Timing Role: Low-noise shunt reference minimizing quantization error in 12-bit pixel data conversion. Use Value: 35µVRMS noise and 0.08% thermal hysteresis prevent visible banding or color shift in captured video frames. |
| Automotive Body Control Module (BCM) Power Monitoring | EV Battery Management System (BMS) Cell Voltage Sensing |
Use Scenario: Calibrating supply rail monitors for interior lighting and window actuator drivers in BCMs subjected to repeated thermal shock during vehicle start-stop cycles. IC Role / Device Role / Timing Role: Precision voltage reference for comparator thresholds detecting undervoltage/overvoltage conditions on 12V distribution rails. Use Value: 120ppm long-term stability ensures threshold accuracy remains valid over 15-year vehicle lifetime without recalibration. |
Use Scenario: Establishing reference for differential amplifiers measuring individual Li-ion cell voltages (±5mV accuracy target) in multi-cell BMS stacks. IC Role / Device Role / Timing Role: Stable 3.0V shunt reference enabling ratiometric measurement against known reference for high-side sensing. Use Value: 1.3mV max ΔVR/ΔIR over 60µA–1mA ensures consistent gain calibration across varying cell impedance and temperature gradients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C30IDBZR | ±0.5% initial tolerance, 75 ppm/°C max TC, 50µA–10mA operating range - tighter tolerance but narrower current range. | Preferred for non-automotive industrial instrumentation where AEC-Q100 is not required. | Select when higher initial accuracy outweighs automotive qualification needs and lower current headroom is acceptable. |
| MAX6003EUR+T | ±0.2% initial tolerance, 20ppm/°C typical TC, 100µA–10mA range - superior stability but no AEC-Q100 certification. | Suitable for medical or test equipment demanding ultra-low drift, but not for production automotive ECUs. | Choose when long-term stability and low TC dominate over automotive compliance and wide current support. |
Compared with TL4050C30IDBZR and MAX6003EUR+T, the LM4040D30QFTA trades initial accuracy and TC performance for guaranteed AEC-Q100 qualification, extended current range (60µA–15mA), and proven robustness in automotive thermal cycling - making it the default choice for volume automotive designs requiring PPAP traceability.
Availability
LM4040D30QFTA is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and EV battery management systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM4040D30QFTA 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 components, with core expertise in power management, signal integrity, and precision analog solutions.
The LM4040Q family is part of Diodes' automotive-qualified precision reference portfolio, engineered specifically for AEC-Q100 Grade 1 operation in engine control, ADAS, and powertrain systems where reliability under thermal stress is critical.
FAQ
What is the minimum cathode current required for regulation at –40°C?
The LM4040D30QFTA requires a minimum cathode current of 70µA at –40°C to maintain regulation, as specified in the Electrical Characteristics table (DS36989 p.3). This value exceeds the +25°C minimum of 67µA due to increased bandgap voltage sensitivity at low temperatures, and must be ensured by proper RS sizing in shunt regulator designs.
Can Pin 3 of the SOT23 package be grounded independently?
No - Pin 3 is the internal die attach pad and is electrically connected to Pin 2 (Cathode) per Diodes' package construction. Grounding Pin 3 independently creates a short between Cathode and Anode, destroying regulation. It must remain floating or be tied directly to Pin 2, as explicitly stated in the PCB Layout section (DS36989 p.12).
How does the 35µVRMS noise specification translate to effective resolution loss in a 12-bit ADC?
At 35µVRMS noise over 10Hz–10kHz, the peak-to-peak noise is approximately 220µV (×6.3). Referenced to a 3.0V full-scale range, this corresponds to ~0.0073% FS or ~3 LSBs of uncertainty in a 12-bit (4096-step) system - well within typical automotive ADC INL specifications and compatible with ASIL-B functional safety targets.
Is the LM4040D30QFTA compatible with lead-free reflow profiles?
Yes - the LM4040D30QFTA uses matte tin-plated leads compliant with J-STD-020 moisture sensitivity Level 1 and is rated for standard Pb-free reflow profiles (peak 260°C). Its SOT23 package has been validated for wave soldering with recommended land pattern extensions, and full process compatibility details are provided in Diodes' AP02007 packaging document.
LM4040D30QFTA 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 75 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040D30QFTA FAQ
1.How can I place an order for LM4040D30QFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D30QFTA 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 LM4040D30QFTA reliable?
The price and inventory of LM4040D30QFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D30QFTA is usually 5 days.
3.What payment methods are accepted for LM4040D30QFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D30QFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040D30QFTA?
LM4040D30QFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D30QFTA 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 LM4040D30QFTA?
For technical support, including LM4040D30QFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D30QFTA requirements.
6.How does Aetrix verify that LM4040D30QFTA is sourced from the original manufacturer or authorized distributors?
All LM4040D30QFTA 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 LM4040D30QFTA meets industry standards.
7.What is the process for return or replacement of LM4040D30QFTA?
All LM4040D30QFTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D30QFTA, 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 LM4040D30QFTA part is unused and in its original packaging.
Return procedure for LM4040D30QFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D30QFTA 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…
