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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:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,338
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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, 60μA–15mA operating current range, 1.1Ω dynamic impedance at 1mA, and guaranteed operation from –40°C to +125°C. It serves as a stable reference for ADCs, DACs, and power-supply monitoring in space-constrained portable electronics.
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 reverse breakdown voltage, no-output-capacitor requirement, ultra-small SC70 footprint, wide shunt current capability, and extended industrial temperature range.
Technical Context
The LM4040DEX3-3.3-T uses a bandgap-based shunt architecture to maintain a precise 3.300V reverse breakdown voltage across cathode-to-anode terminals. Its laser-trimmed resistor network ensures factory-set accuracy, while internal compensation enables stability with any capacitive load-no external capacitor required.
It operates over 60μA–15mA shunt current without regulation loss, delivering low 50µVRMS wideband noise (10Hz–10kHz) and maintaining ≤±1.98% total voltage tolerance over –40°C to +125°C per D-grade specification. The device exhibits typical temperature drift of ±15ppm/°C at low currents and supports forward conduction up to 10mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V nominal reverse breakdown voltage, with ±30mV (±0.91%) tolerance at +25°C and ±59mV (±1.79%) over full –40°C to +125°C range |
| Initial Accuracy | 1.0% (D-grade), enabling direct use in 10-bit systems without calibration |
| Tempco | ±150ppm/°C max (IR = 1mA), limiting worst-case drift to ±15.6mV over 105°C span |
| Shunt Current Range | 60μA to 15mA operational range-supports micropower sleep modes and high-current regulation |
| Dynamic Impedance | 1.3Ω max at 1mA/120Hz, ensuring <10mV output shift under 1mA load transients |
| Output Noise | 50µVRMS (10Hz–10kHz), suitable for 12-bit SAR ADC reference without filtering |
| Operating Temp | –40°C to +125°C, qualified for automotive under-hood and industrial control environments |
Pinout & Package
LM4040DEX3-3.3-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is unconnected (N.C.) and must remain floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias terminal-connects to regulated voltage node; sinks shunt current |
| 2 (–) | Anode | Reference ground terminal-common return for load and bias resistor |
| 3 (N.C.) | No Connection | Internally unconnected; must be left floating or shorted to pin 2-never driven |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23, critical for wearables and compact modules |
| No output capacitor required | Stable with any capacitive load-including 1µF ceramic-eliminating BOM cost and layout sensitivity |
| Wide shunt current range | 60μA minimum start-up current enables operation in battery-backed circuits with µA quiescent budgets |
| Extended temperature qualification | –40°C to +125°C rating supports industrial PLCs and automotive body-control modules |
| Low dynamic impedance | 1.3Ω max ensures <13mV output deviation during 10mA load steps-critical for precision sensing |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with 16-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 3.3V reference for ADC VREF input. Use Value: Enables ±0.5 LSB accuracy over –20°C to +70°C ambient without recalibration due to low tempco and tight initial tolerance. |
Use Scenario: 4–20mA loop-powered transmitter with microcontroller and analog front-end. IC Role / Device Role / Timing Role: Precision voltage reference for current-loop DAC and sensor signal conditioning. Use Value: Maintains 0.1% full-scale accuracy across –40°C to +85°C industrial environment using only 60μA quiescent current. |
| Automotive Cabin Control | Smart Energy Meters |
Use Scenario: HVAC control module requiring accurate temperature and humidity readings. IC Role / Device Role / Timing Role: Reference source for multi-channel SAR ADC measuring thermistor and capacitive humidity sensors. Use Value: Delivers stable 3.3V reference despite engine bay thermal cycling (–40°C to +125°C), meeting AEC-Q100 Class 0 requirements. |
Use Scenario: DIN-rail mounted electricity meter with metrology-grade ADC and isolation barrier. IC Role / Device Role / Timing Role: Primary shunt reference for polyphase energy measurement IC (e.g., ADE7953). Use Value: Provides 50µVRMS low-noise reference enabling 0.1% kWh accuracy over 20-year field life with 120ppm long-term stability. |
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 | 3.3V, 0.5% initial accuracy, ±50ppm/°C tempco, SOT23-3 package, 75μA–15mA range | Better accuracy and lower tempco, but larger SOT23 footprint and narrower min-current spec | Select when higher precision is required and board space allows SOT23; not drop-in due to different pinout and package size |
| ADR3433ARJZ-R7 | 3.3V, 0.1% initial accuracy, ±10ppm/°C tempco, SC70-5 package, 200μA–10mA range | Higher accuracy and lower noise (12µVRMS), but requires 200μA min current and 5-pin layout | Choose for metrology-grade designs where ultra-low drift matters more than micropower operation |
Compared with TL4050C33IDBZR and ADR3433ARJZ-R7, LM4040DEX3-3.3-T offers the smallest footprint and lowest minimum operating current-enabling use in coin-cell-powered devices where 60μA startup and SC70 area are decisive-but trades off absolute accuracy and tempco for cost and size efficiency.
Availability
LM4040DEX3-3.3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and automotive cabin control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The LM4040 series is designed as a micropower shunt voltage reference family targeting space-constrained, battery-operated, and high-reliability applications where stable, fixed-voltage references are needed without external components.
FAQ
What is the exact reverse breakdown voltage tolerance of LM4040DEX3-3.3-T over its full temperature range?
The LM4040DEX3-3.3-T has a ±59mV (±1.79%) reverse breakdown voltage tolerance over –40°C to +125°C, calculated as ±30mV room-temperature tolerance plus ±150ppm/°C × 100°C × 3.3V. This is confirmed in the Electrical Characteristics table for the 3.3V variant under D-grade conditions.
Can LM4040DEX3-3.3-T operate stably with a 10µF ceramic output capacitor?
Yes, LM4040DEX3-3.3-T is explicitly designed to be stable with any capacitive load-including 10µF ceramic-without requiring an external series resistor or damping network. This is stated in both the General Description and Applications Information sections of the datasheet.
What is the minimum shunt current required for LM4040DEX3-3.3-T to regulate properly at –40°C?
The LM4040DEX3-3.3-T requires a minimum shunt current of 67µA at –40°C, as specified in the Electrical Characteristics table for the 3.3V variant under D-grade conditions. This exceeds the room-temperature minimum of 67µA and ensures reliable turn-on across the full industrial temperature range.
Is pin 3 of LM4040DEX3-3.3-T internally connected or should it be left floating?
Pin 3 of LM4040DEX3-3.3-T is designated N.C. (No Connection) and is internally unconnected. The datasheet explicitly states it must be left unconnected or tied to pin 2 (anode); driving or loading pin 3 may cause malfunction or damage.
How does the dynamic impedance of LM4040DEX3-3.3-T affect ADC reference performance?
The LM4040DEX3-3.3-T's dynamic impedance of 1.3Ω max at 1mA means a 1mA transient load draws only 1.3mV of error-well within the LSB of a 12-bit 3.3V ADC (0.8mV). This ensures reference stability during fast ADC conversions without added buffering.
LM4040DEX3-3.3-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Bulk
- 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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