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Analog Devices Inc./Maxim Integrated LM4040DEX3-3.3+T
- Part No.:
- LM4040DEX3-3.3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040DEX3-3.3+T.pdf
- Description:
- IC VREF SHUNT 1% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:17,550
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Product details
Overview
LM4040DEX3-3.3+T from Maxim Integrated is a precision 3.3V two-terminal shunt voltage reference in SC70-3 package, featuring 1.0% initial accuracy, ±150ppm/°C temperature coefficient, and guaranteed operation from −40°C to +125°C. It delivers stable reverse breakdown voltage with 60μA to 15mA shunt current capability and low 50μVRMS wideband noise (10Hz–10kHz), ideal for high-reliability analog sensing and power monitoring in compact portable systems.
For engineers reviewing the LM4040DEX3-3.3+T datasheet, LM4040DEX3-3.3+T pinout, LM4040DEX3-3.3+T application, or LM4040DEX3-3.3+T equivalent, key selection criteria include its fixed 3.3V output, SC70-3 footprint compatibility, AEC-Q100-qualified variants, thermal stability over automotive temperature range, and capacitor-free load stability-critical for battery-powered instrumentation and industrial control feedback loops.
Technical Context
The LM4040DEX3-3.3+T implements a laser-trimmed bandgap reference core with no external capacitor required for stability, tolerating any capacitive load while maintaining regulation across 60μA–15mA shunt current. Its dynamic impedance is ≤1.3Ω at 1mA/120Hz, enabling precise voltage referencing under varying load conditions.
Designed for high-temperature environments, it guarantees performance over −40°C to +125°C with 120ppm long-term stability after 1000 hours and reverse breakdown voltage change of ≤1.5mV over 1mA–15mA current range. The device operates as a two-terminal shunt element, sinking current to maintain fixed cathode-to-anode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V nominal; min/max = 3.267V/3.333V at +25°C (D-grade tolerance) |
| Initial Accuracy | ±1.0% (±33mV); enables direct use in 12-bit ADC reference without trimming |
| Temp Coefficient | ±150ppm/°C max; contributes ≤±19.5mV drift over −40°C to +125°C |
| Shunt Current Range | 60μA to 15mA; supports ultra-low-power sleep modes and high-current regulation |
| Wideband Noise | 50μVRMS (10Hz–10kHz); suitable for precision 16-bit SAR ADC references |
| Dynamic Impedance | ≤1.3Ω at 1mA/120Hz; ensures <1mV output shift under 1mA load transients |
| Long-Term Stability | 120ppm after 1000h; maintains calibration integrity in sealed industrial sensors |
Pinout & Package
Package: SC70-3 (1.8mm × 1.8mm), RoHS-compliant, tape-and-reel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node (e.g., ADC VREF) |
| 2 (−) | Anode | Reference ground return; must be tied to system ground or low-impedance return path |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to pin 2; floating pin risks instability or ESD damage |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 50% smaller than SOT23; saves >0.5mm² PCB area in space-constrained wearables |
| No output capacitor required | Stable with any capacitive load up to 10µF; eliminates BOM cost and layout sensitivity |
| Extended temperature range | −40°C to +125°C operation; qualified for under-hood automotive and industrial PLC modules |
| Low wideband noise | 50μVRMS (10Hz–10kHz); reduces quantization error in precision data acquisition systems |
| Laser-trimmed accuracy | Guaranteed ±1.0% at +25°C; enables single-point calibration in production test |
Applications
| Portable Medical Sensors | Automotive Cabin Control Units |
|---|---|
Use Scenario: Battery-powered pulse oximeter with 16-bit ADC measuring photodiode current. IC Role / Device Role / Timing Role: Shunt voltage reference for ADC VREF input, establishing precise 3.3V full-scale range. Use Value: ±1.0% initial accuracy and ±150ppm/°C TC ensure <0.5% total measurement error across operating temperature, meeting ISO 80601 clinical accuracy requirements. | Use Scenario: HVAC control module in vehicle cabin with microcontroller and analog sensor interface. IC Role / Device Role / Timing Role: Stable 3.3V reference for temperature/humidity sensor signal conditioning and ADC conversion. Use Value: Guaranteed −40°C to +125°C operation and AEC-Q100 qualification enable reliable performance in under-dash mounting locations subject to thermal cycling. |
| Industrial Process Transmitters | Smart Energy Meters |
Use Scenario: 4–20mA loop-powered pressure transmitter with HART modulation. IC Role / Device Role / Timing Role: Precision shunt reference for DAC output scaling and current-loop compliance voltage setting. Use Value: 60μA minimum operating current allows operation down to 3.3V supply with 200Ω loop resistance, supporting low-voltage loop designs. | Use Scenario: Polyphase electricity meter with metrology IC requiring stable reference for RMS voltage/current calculation. IC Role / Device Role / Timing Role: Primary voltage reference for metrology ADC, directly tied to analog front-end input stage. Use Value: 120ppm long-term stability ensures <0.01% calibration drift over 10-year field life, satisfying IEC 62053-21 Class 0.2 accuracy class. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | Adjustable 2.495V reference; requires two external resistors for 3.3V setup; higher 22Ω dynamic impedance | Used where programmability or tighter 0.5% initial accuracy is needed; less suitable for ultra-low-power sleep modes | Select when design flexibility outweighs fixed-voltage simplicity and SC70 size constraint |
| MAX6008AEUR+T | 3.3V fixed shunt reference; 0.2% initial accuracy; SC70-3; ±50ppm/°C TC; 30μVRMS noise | Better accuracy and lower noise, but limited to −40°C to +85°C; not AEC-Q100 qualified | Choose for commercial-grade instrumentation where extended temperature is not required |
Compared with TL431ACDBVR and MAX6008AEUR+T, the LM4040DEX3-3.3+T offers the only combination of AEC-Q100 qualification, −40°C to +125°C operation, and SC70-3 packaging among these three - making it uniquely suited for automotive and harsh-environment industrial deployments where reliability and footprint are co-prioritized.
Availability
LM4040DEX3-3.3+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin control units, industrial process transmitters, and smart energy meters requiring stable component supply with full traceability and long-lifecycle support.
Supply support for LM4040DEX3-3.3+T 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The LM4040 product line delivers micropower, high-accuracy shunt voltage references optimized for space-constrained, high-reliability systems where stability across temperature and time is critical.
FAQ
What is the maximum shunt current rating for LM4040DEX3-3.3+T?
The LM4040DEX3-3.3+T supports a continuous shunt current range of 60μA to 15mA. Absolute maximum reverse current is 20mA - exceeding this risks permanent damage. For reliable operation, keep ISHUNT ≤15mA under all conditions, especially at high ambient temperatures where self-heating may reduce safe operating area.
Does LM4040DEX3-3.3+T require an external capacitor for stability?
No, the LM4040DEX3-3.3+T does not require an external output capacitor and remains stable with any capacitive load, including 0–10µF. This eliminates layout sensitivity and reduces BOM count. However, if used in noisy environments, a small 100nF ceramic capacitor from cathode to anode can further suppress high-frequency ripple without affecting regulation.
What is the top-marking code for LM4040DEX3-3.3+T?
The top-marking code for LM4040DEX3-3.3+T is AOB, laser-etched on the SC70-3 package. This marking identifies the specific variant: 3.3V output, D-grade (1.0% accuracy), extended temperature range (−40°C to +125°C), and SC70-3 package. It matches the ordering information table in the Maxim datasheet Rev 12.
How does the temperature coefficient affect LM4040DEX3-3.3+T output voltage over its full operating range?
With a maximum temperature coefficient of ±150ppm/°C, the LM4040DEX3-3.3+T exhibits up to ±19.5mV total drift from −40°C to +125°C (165°C span). At +25°C, output is 3.300V; worst-case deviation occurs at extremes - e.g., 3.2805V at −40°C or 3.3195V at +125°C - remaining within system-level tolerance budgets for most 12-bit applications.
Is LM4040DEX3-3.3+T AEC-Q100 qualified?
Yes, LM4040DEX3-3.3+T is AEC-Q100 qualified for automotive applications. The "E" suffix in the part number denotes the extended −40°C to +125°C temperature grade, and the datasheet explicitly states AEC-Q100 qualification in the Benefits and Features section. This makes it suitable for non-safety-critical automotive subsystems such as body electronics, infotainment power supplies, and cabin environmental controls.
LM4040DEX3-3.3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- 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:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040DEX3-3.3+T FAQ
1.How can I place an order for LM4040DEX3-3.3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040DEX3-3.3+T 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 LM4040DEX3-3.3+T reliable?
The price and inventory of LM4040DEX3-3.3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040DEX3-3.3+T is usually 5 days.
3.What payment methods are accepted for LM4040DEX3-3.3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040DEX3-3.3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040DEX3-3.3+T?
LM4040DEX3-3.3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040DEX3-3.3+T 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 LM4040DEX3-3.3+T?
For technical support, including LM4040DEX3-3.3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040DEX3-3.3+T requirements.
6.How does Aetrix verify that LM4040DEX3-3.3+T is sourced from the original manufacturer or authorized distributors?
All LM4040DEX3-3.3+T 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 LM4040DEX3-3.3+T meets industry standards.
7.What is the process for return or replacement of LM4040DEX3-3.3+T?
All LM4040DEX3-3.3+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040DEX3-3.3+T, 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 LM4040DEX3-3.3+T part is unused and in its original packaging.
Return procedure for LM4040DEX3-3.3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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