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Diodes Incorporated LM4040C33QFTA
- Part No.:
- LM4040C33QFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040C33QFTA.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,504
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Product details
Overview
LM4040C33QFTA from Diodes Incorporated is a C-grade (±0.5% initial tolerance), 3.3V precision micropower shunt voltage reference in SOT23 package, designed for automotive data acquisition and sensor biasing where stable reference voltage, low temperature drift (≤100 ppm/°C max), and operation from 60 µA to 15 mA are required.
For engineers reviewing the LM4040C33QFTA datasheet, LM4040C33QFTA pinout, LM4040C33QFTA application, or LM4040C33QFTA equivalent, key selection criteria include reverse breakdown voltage tolerance at +25°C and over temperature, dynamic output impedance, noise performance (35 µVRMS, 10 Hz–10 kHz), and AEC-Q100 qualification status for automotive use.
Technical Context
The LM4040C33QFTA operates as a two-terminal shunt reference, requiring only an external series resistor to regulate voltage across a load. Its bandgap-based architecture delivers stable 3.3 V output with minimal dependence on supply variation or load current changes within its 60 µA–15 mA operating range.
It maintains stability with capacitive loads up to 1.0 µF (tantalum) and exhibits low thermal hysteresis (0.08%) and long-term stability (120 ppm over 1000 hours), making it suitable for high-accuracy analog signal conditioning in harsh automotive environments (-40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal reverse breakdown voltage at 100 µA, enabling precise ADC/DAC reference and sensor excitation. |
| Initial Tolerance | ±0.5% at +25°C (C-grade), ensuring predictable accuracy without post-manufacture trimming. |
| Temp Coefficient | ≤100 ppm/°C (max) over -40°C to +125°C, minimizing voltage drift in under-hood automotive applications. |
| Operating Current | 60 µA to 15 mA, supporting ultra-low-power systems and high-current precision references with same device. |
| Noise (10Hz–10kHz) | 35 µVRMS, critical for high-resolution data acquisition and low-noise analog front-ends. |
| Dynamic Impedance | 0.9 Ω typical at 1 mA, 120 Hz, ensuring minimal load-induced voltage perturbation. |
| Long-Term Stability | 120 ppm over 1000 hours, reducing calibration frequency in safety-critical automotive modules. |
Pinout & Package
SOT23-3 package with die attached to Pin 3; Pin 3 must be left floating or tied to Pin 2 per layout guidance. Small footprint (2.4 mm × 1.3 mm) supports space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Common return path for shunt current; referenced to system GND in standard configuration. |
| Cathode (Pin 2) | Output voltage terminal | Provides regulated 3.3 V output; connected to load and external series resistor (RS). |
| Die Attach (Pin 3) | Internal die connection | Electrically tied to Pin 2; must not be independently biased-leave floating or short to Pin 2. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with 0–1.0 µF capacitive load, simplifying BOM and layout in ECU power domains. |
| AEC-Q100 qualified | Qualified for automotive applications with PPAP support and IATF 16949 manufacturing, meeting functional safety readiness requirements. |
| Low temperature coefficient | ≤100 ppm/°C max ensures ≤±3.3 mV total drift over full -40°C to +125°C range, critical for engine control sensors. |
| Green, RoHS-compliant packaging | Lead-free, halogen- and antimony-free SOT23 meets global automotive environmental compliance mandates. |
| High ESD robustness | 4 kV HBM rating enables reliable handling during automated assembly and field service in vehicle production lines. |
Applications
| Engine Control Unit (ECU) Sensor Biasing | Automotive Data Acquisition Systems |
|---|---|
Use Scenario: Providing stable excitation voltage to resistive temperature sensors (RTDs) and pressure transducers in engine management systems. IC Role / Device Role / Timing Role: Two-terminal shunt reference establishing precise 3.3 V bias point independent of supply rail fluctuations. Use Value: Enables <12-bit effective resolution in analog-to-digital conversion despite wide ambient temperature swings and battery voltage variation. | Use Scenario: Serving as reference for 12–16-bit SAR ADCs in vehicle telematics and ADAS sensor fusion units. IC Role / Device Role / Timing Role: High-stability voltage reference for ADC internal scaling and external signal conditioning stages. Use Value: Reduces gain error contribution to <0.05% FS, directly improving measurement fidelity of LiDAR or radar front-end digitization. |
| On-Board Diagnostic (OBD-II) Modules | Electric Power Steering (EPS) Motor Control |
Use Scenario: Calibrating voltage monitoring circuits that detect battery health, alternator output, and rail integrity in OBD-II compliant ECUs. IC Role / Device Role / Timing Role: Precision reference for comparator thresholds and analog monitor channels used in fault detection logic. Use Value: Ensures consistent trip-point accuracy across temperature and lifetime, preventing false DTCs and enabling ISO 14229-compliant diagnostics. | Use Scenario: Supplying reference voltage to current-sense amplifiers and PWM feedback comparators in EPS motor phase current regulation loops. IC Role / Device Role / Timing Role: Stable 3.3 V reference for analog signal chain components ensuring accurate torque estimation and closed-loop control. Use Value: Maintains ±0.5% current sensing accuracy over full operating temperature range, contributing to ASIL-B functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050C33IDBZR | Same 3.3 V, ±0.5% tolerance, but higher max temp coefficient (150 ppm/°C vs. 100 ppm/°C) and no AEC-Q100 qualification. | Targeted at commercial industrial systems; lacks PPAP documentation and automotive change control. | Select when cost sensitivity outweighs automotive qualification requirements and wider temp drift is acceptable. |
| MAX6008AEUR+T | 3.3 V, ±0.5% tolerance, but narrower operating current range (45 µA–10 mA) and higher noise (60 µVRMS). | Designed for portable medical and instrumentation; not rated for automotive temperature extremes. | Prefer for battery-powered non-automotive applications where lower quiescent current is prioritized over thermal stability. |
Compared with TL4050C33IDBZR and MAX6008AEUR+T, the LM4040C33QFTA uniquely combines AEC-Q100 qualification, ≤100 ppm/°C drift, and 60 µA–15 mA operational flexibility-making it the only drop-in solution for production automotive ECUs requiring both precision and compliance.
Availability
LM4040C33QFTA is available at Aetrix Electronics and suitable for automotive data acquisition systems, engine control units, and on-board diagnostic modules requiring stable component supply with full traceability and lifecycle continuity.
Supply support for LM4040C33QFTA 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.
The LM4040Q series is part of Diodes' automotive-qualified precision reference portfolio, engineered specifically for high-reliability voltage referencing in engine control, ADAS, and body electronics where AEC-Q100 compliance and thermal stability are mandatory.
FAQ
What is the minimum operating current for LM4040C33QFTA at -40°C?
The minimum operating current is 70 µA at -40°C to +125°C ambient, as specified in the Recommended Operating Conditions table. Below this current, the device may not maintain regulation or specified tolerance, especially at temperature extremes.
Can LM4040C33QFTA drive a 1 µF tantalum capacitor directly?
Yes-the datasheet explicitly confirms stable operation with up to 1.0 µF tantalum capacitive load. This eliminates need for series resistance or isolation, simplifying design in noisy automotive power domains where bulk capacitance is common.
Is LM4040C33QFTA pin-compatible with standard LM4040 variants?
Yes-it uses identical SOT23-3 pinout and electrical behavior as industry-standard LM4040 devices, enabling direct replacement in existing designs. However, only the Q-suffix versions are AEC-Q100 qualified and manufactured in IATF 16949 facilities.
How does the 0.08% thermal hysteresis impact calibration in automotive modules?
Thermal hysteresis of 0.08% (≈2.6 mV at 3.3 V) represents maximum voltage shift after cycling between -40°C and +125°C. This enables single-point calibration in production without re-trimming after thermal stress, reducing test time and cost in high-volume ECU manufacturing.
LM4040C33QFTA 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):
- 3.3V
- 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:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4040C33QFTA FAQ
1.How can I place an order for LM4040C33QFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C33QFTA 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 LM4040C33QFTA reliable?
The price and inventory of LM4040C33QFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C33QFTA is usually 5 days.
3.What payment methods are accepted for LM4040C33QFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C33QFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C33QFTA?
LM4040C33QFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C33QFTA 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 LM4040C33QFTA?
For technical support, including LM4040C33QFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C33QFTA requirements.
6.How does Aetrix verify that LM4040C33QFTA is sourced from the original manufacturer or authorized distributors?
All LM4040C33QFTA 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 LM4040C33QFTA meets industry standards.
7.What is the process for return or replacement of LM4040C33QFTA?
All LM4040C33QFTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C33QFTA, 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 LM4040C33QFTA part is unused and in its original packaging.
Return procedure for LM4040C33QFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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