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Diodes Incorporated LM4040B33QFTA
- Part No.:
- LM4040B33QFTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4040B33QFTA.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:5,032
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Product details
Overview
LM4040B33QFTA from Diodes Incorporated is an AEC-Q100 qualified, 3.3V precision shunt voltage reference in SOT23 package with ±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 - used for high-accuracy ADC/DAC biasing and sensor excitation in automotive powertrain control modules.
For engineers reviewing the LM4040B33QFTA datasheet, LM4040B33QFTA pinout, LM4040B33QFTA application, or LM4040B33QFTA equivalent, key selection criteria include automotive-grade stability (±0.08% thermal hysteresis), low 35µVRMS noise (10Hz–10kHz), no-output-capacitor operation, and SOT23 footprint compatibility with legacy LM4040 designs.
Technical Context
The LM4040B33QFTA implements a bandgap-based shunt reference architecture optimized for micropower operation, delivering stable 3.3V output across wide current (60µA–15mA) and temperature (–40°C to +125°C) ranges. Its dynamic impedance remains ≤0.9Ω at 1mA/120Hz, enabling robust performance under varying load conditions.
It features intrinsic capacitive-load tolerance without external compensation, supports AEC-Q100 Grade 1 qualification, and maintains <±30ppm/°C tempco over full automotive temperature range when biased at 1mA - critical for engine control unit (ECU) analog front-end accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V nominal at 100µA reverse current - sets precise bias point for 12-bit+ SAR ADCs in automotive sensors. |
| Initial Tolerance | ±0.2% at +25°C - enables single-point calibration in production test for tight system-level voltage accuracy. |
| Tempco | ±20ppm/°C (typ), ≤100ppm/°C (max) - ensures <±0.33% drift over –40°C to +125°C, meeting ASIL-B analog signal chain requirements. |
| Operating Current | 60µA to 15mA reverse current - supports ultra-low-power wake-up circuits and high-current reference buffering in same design. |
| Noise (10Hz–10kHz) | 35µVRMS - limits quantization error in 16-bit delta-sigma ADCs used in battery monitoring systems. |
| Thermal Hysteresis | 0.08% - guarantees repeatable voltage after thermal cycling, essential for ECU re-calibration integrity. |
| Long-Term Stability | 120ppm (1000 hrs @ 100µA) - ensures <0.012% drift over 5-year vehicle lifetime without field recalibration. |
Pinout & Package
SOT23-3 package with die attached to pin 3; pin 3 must be left floating or tied to pin 2 per layout guidelines. Small outline surface-mount construction enables high-density PCB placement in space-constrained automotive ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Common return path for all current paths; must connect to clean analog ground plane to minimize noise coupling. |
| Cathode (Pin 2) | Output voltage node | Delivers regulated 3.3V; connects to ADC REF+ or sensor bridge excitation; requires local 100nF ceramic decoupling. |
| NC / Die Attach (Pin 3) | Internal die thermal pad | Electrically connected to cathode; must be left floating or shorted to pin 2 - never driven or grounded independently. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with 0–1µF capacitive loads - eliminates BOM cost and board area for external stabilization components. |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C), PPAP-capable, IATF 16949 manufacturing - meets OEM Tier-1 supply chain traceability and change control mandates. |
| Low dynamic impedance | 0.9Ω typical at 1mA/120Hz - minimizes output voltage shift during transient load steps in multiplexed sensor interfaces. |
| Green packaging | Halogen- and antimony-free, RoHS 3 compliant (≤900ppm Br/Cl, ≤1000ppm Sb) - satisfies EU ELV and global automotive environmental compliance. |
| ESD robustness | 4kV HBM, 1kV CDM - withstands assembly handling and in-vehicle electrostatic events without parameter shift. |
Applications
| Engine Control Unit (ECU) Analog Front-End | Automotive Battery Management System (BMS) |
|---|---|
|
Use Scenario: Providing reference voltage for 12-bit ADC sampling of throttle position, manifold pressure, and oxygen sensor signals. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute scaling for analog-to-digital conversion. Use Value: ±0.2% tolerance and 20ppm/°C tempco ensure <±0.5% total measurement error across full engine operating range, satisfying ISO 26262 ASIL-B functional safety targets. |
Use Scenario: Biasing precision current-sense amplifiers and cell-voltage monitors in 12S lithium-ion battery packs. IC Role / Device Role / Timing Role: Stable 3.3V reference for gain-setting resistors and ADC reference inputs in isolated sensing channels. Use Value: 35µVRMS low-noise performance prevents added quantization uncertainty in sub-1mV cell voltage resolution, enabling accurate state-of-charge estimation. |
| ADAS Camera Module Power Sequencing | Automotive HVAC Sensor Interface |
|
Use Scenario: Generating reference for voltage supervisors and reset generators controlling image sensor and ISP power-rail sequencing. IC Role / Device Role / Timing Role: Precision shunt reference defining threshold voltages for POR and brown-out detection circuits. Use Value: 0.08% thermal hysteresis prevents false resets during rapid cabin temperature changes, ensuring reliable camera boot-up in cold-start conditions. |
Use Scenario: Supplying excitation voltage to NTC thermistors and humidity sensors in climate control units. IC Role / Device Role / Timing Role: Low-drift reference source for ratiometric sensor measurements in analog signal conditioning stages. Use Value: 120ppm long-term stability ensures <±0.012% reference drift over 5 years, eliminating need for periodic HVAC calibration in service intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4050B33QDBZR | ±0.2% tolerance, 50ppm/°C max tempco, 75µVRMS noise - higher drift and noise than LM4040B33QFTA. | Acceptable for non-safety-critical body electronics but not ASIL-B ECU front-ends. | Choose only if existing TI-based BOM consolidation outweighs performance trade-offs. |
| MAX6003AEUR+T | ±0.2% tolerance, 25ppm/°C max tempco, 40µVRMS noise - lacks AEC-Q100 qualification and automotive PPAP support. | Restricted to industrial or consumer automotive accessories; not approved for powertrain or ADAS. | Select only for prototyping or non-OEM programs where automotive certification is not mandated. |
Compared with TL4050B33QDBZR and MAX6003AEUR+T, the LM4040B33QFTA delivers superior thermal stability (20ppm/°C vs. 50/25ppm/°C), lower noise (35µVRMS), and full automotive qualification - making it the only option suitable for ASIL-B-compliant powertrain and ADAS reference designs.
Availability
LM4040B33QFTA is available at Aetrix Electronics and suitable for automotive powertrain control, battery management systems, ADAS camera modules, and HVAC sensor interfaces requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LM4040B33QFTA 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 computing markets, with IATF 16949-certified production facilities.
The LM4040Q series was developed specifically for automotive applications requiring AEC-Q100 qualification, high reliability, and zero-defect manufacturing - targeting precision analog subsystems in engine control, battery monitoring, and advanced driver assistance systems.
FAQ
What is the minimum operating current for LM4040B33QFTA at –40°C?
The minimum operating current is 70µA at –40°C to +125°C ambient, as specified in the Recommended Operating Conditions table. Below this current, the device may not maintain regulation within its specified tolerance band, risking ADC reference inaccuracy in cold-start ECU operation.
Can LM4040B33QFTA drive a 100pF capacitive load without oscillation?
Yes - the device is explicitly characterized for stability with up to 1µF capacitive loads and requires no external compensation. At 100pF, phase margin exceeds 60°, ensuring monotonic startup and no ringing during power-on transients in automotive sensor nodes.
How does the SOT23 pin 3 connection affect PCB layout?
Pin 3 is internally bonded to the die substrate and electrically connected to pin 2 (cathode). It must either be left unconnected or shorted to pin 2 on the PCB - never routed to ground or driven, as doing so creates a parasitic current path that degrades regulation accuracy and thermal performance.
Is LM4040B33QFTA compatible with lead-free reflow profiles?
Yes - it is fully RoHS 3 compliant with matte tin-plated leads, rated for peak reflow temperatures up to 260°C per J-STD-020, and classified as Moisture Sensitivity Level 1, allowing unlimited floor life and standard Pb-free soldering without preconditioning.
LM4040B33QFTA 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:
- ±0.2%
- 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
LM4040B33QFTA FAQ
1.How can I place an order for LM4040B33QFTA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040B33QFTA 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 LM4040B33QFTA reliable?
The price and inventory of LM4040B33QFTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040B33QFTA is usually 5 days.
3.What payment methods are accepted for LM4040B33QFTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040B33QFTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040B33QFTA?
LM4040B33QFTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040B33QFTA 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 LM4040B33QFTA?
For technical support, including LM4040B33QFTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040B33QFTA requirements.
6.How does Aetrix verify that LM4040B33QFTA is sourced from the original manufacturer or authorized distributors?
All LM4040B33QFTA 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 LM4040B33QFTA meets industry standards.
7.What is the process for return or replacement of LM4040B33QFTA?
All LM4040B33QFTA units undergo pre-shipment inspection (PSI). If there is an issue with LM4040B33QFTA, 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 LM4040B33QFTA part is unused and in its original packaging.
Return procedure for LM4040B33QFTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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