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Analog Devices Inc./Maxim Integrated LM4040BEX3-3.3-T
- Part No.:
- LM4040BEX3-3.3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4040BEX3-3.3-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:6,555
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Product details
Overview
LM4040BEX3-3.3-T from Maxim Integrated is a precision 3.3V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±100ppm/°C temperature coefficient, and guaranteed operation from -40°C to +125°C. It delivers stable reverse breakdown voltage with 60μA–15mA shunt current capability and low 50μVRMS wideband noise (10Hz–10kHz), ideal for high-accuracy analog sensing and ADC reference in portable battery-powered systems.
For engineers reviewing the LM4040BEX3-3.3-T datasheet, LM4040BEX3-3.3-T pinout, LM4040BEX3-3.3-T application, or LM4040BEX3-3.3-T equivalent, key selection criteria include shunt current range, temperature drift over full industrial range, SC70 footprint constraints, no-output-capacitor stability, and long-term voltage stability (120ppm at 1000h).
Technical Context
The LM4040BEX3-3.3-T uses bandgap-based shunt architecture to maintain a precise 3.300V reverse breakdown voltage across its cathode-anode terminals. Its laser-trimmed internal resistor network ensures 0.2% initial tolerance at +25°C, with temperature-induced deviation bounded by ±100ppm/°C over -40°C to +125°C.
It operates as a two-terminal device requiring only an external series resistor to regulate shunt current between 60μA and 15mA. Dynamic impedance remains ≤1.0Ω at 1mA/120Hz, enabling stable regulation under varying load and supply conditions without external capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V nominal at +25°C; min/max = 3.2934V/3.3066V (0.2% grade) |
| Initial Accuracy | ±0.2% at +25°C - enables direct use in 12-bit ADC references without trimming |
| Temp Coefficient | ±100ppm/°C max - contributes ≤±13.2mV drift over -40°C to +125°C |
| Shunt Current Range | 60μA to 15mA - supports ultra-low-power sleep modes and high-current regulation |
| Dynamic Impedance | ≤1.0Ω at 1mA/120Hz - ensures minimal output voltage shift under transient load changes |
| Wideband Noise | 50μVRMS (10Hz–10kHz) - suitable for precision instrumentation and low-noise sensor interfaces |
| Long-Term Stability | 120ppm after 1000h - predictable aging behavior for mission-critical embedded systems |
Pinout & Package
LM4040BEX3-3.3-T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is NC and must be left unconnected or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reverse-bias input terminal; connects to higher-potential node of series resistor |
| 2 (–) | Anode | Reference ground return; defines 0V reference point for output voltage |
| 3 (N.C.) | No Connection | Must remain floating or shorted to pin 2; no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area - saves PCB space in compact portable designs |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout sensitivity |
| Guaranteed -40°C to +125°C operation | Qualified for extended industrial temperature range - suitable for under-hood or factory-floor applications |
| Low 50μVRMS noise | Enables high-resolution data acquisition without external filtering |
| 60μA minimum operating current | Supports micropower systems with standby currents below 100μA |
Applications
| Portable Medical Sensors | Notebook Computer Power Monitoring |
|---|---|
Use Scenario: Reference for 12-bit ADC measuring battery voltage and temperature in handheld glucose meters. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 3.3V reference rail independent of supply variation. Use Value: 0.2% initial accuracy and ±100ppm/°C drift ensure <0.5 LSB error over full operating temperature range. | Use Scenario: Precision voltage monitoring of CPU core and memory rails during dynamic power scaling. IC Role / Device Role / Timing Role: Shunt reference feeding comparator inputs for real-time rail health detection. Use Value: Low 50μVRMS noise prevents false fault triggering; SC70 size fits dense VRM layouts. |
| Industrial Process Transmitters | Smart Energy Meters |
Use Scenario: Reference for 4–20mA loop transmitter DAC in hazardous-area pressure sensors. IC Role / Device Role / Timing Role: Primary voltage reference for current-loop output stage calibration. Use Value: Guaranteed -40°C to +125°C operation ensures reliability in outdoor enclosures; 120ppm long-term stability reduces recalibration frequency. | Use Scenario: Reference for metrology-grade energy measurement ICs (e.g., ADE78xx) in utility-grade meters. IC Role / Device Role / Timing Role: Stable 3.3V reference for high-accuracy polyphase voltage/current sampling. Use Value: 60μA–15mA shunt range accommodates both ultra-low-power wake-up and full-measurement modes without external biasing changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 3-terminal adjustable shunt; 2.5V base reference; requires external resistors for 3.3V setting | Not drop-in; needs redesign of feedback network; higher quiescent current (80μA min) | Select when programmability or tighter tempco (±50ppm/°C) is prioritized over board space |
| MAX6008AEUR+T | 3.3V fixed shunt; 0.2% accuracy; SC70-3; ±75ppm/°C tempco; 50μA–10mA range | Near drop-in replacement but narrower shunt current range and lower max current | Prefer for lower-noise (30μVRMS) and tighter tempco where 10mA max shunt suffices |
Compared with LM4040BEX3-3.3-T, TLVH431ACDBVR offers adjustability at the cost of added components and layout complexity, while MAX6008AEUR+T provides better temperature stability and noise but sacrifices 5mA of shunt headroom - critical in high-supply-voltage or high-load-current configurations.
Availability
LM4040BEX3-3.3-T is available at Aetrix Electronics and suitable for portable medical sensors, notebook computer power monitoring, and industrial process transmitters requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for LM4040BEX3-3.3-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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, sensing, and communication applications.
The LM4040 product line delivers precision micropower shunt voltage references optimized for space-constrained, battery-operated, and high-reliability industrial systems demanding stable reference performance across extreme temperatures.
FAQ
What is the exact reverse breakdown voltage tolerance of LM4040BEX3-3.3-T at +25°C?
The LM4040BEX3-3.3-T has a nominal reverse breakdown voltage of 3.300V at +25°C, with a guaranteed tolerance of ±0.2% - corresponding to 3.2934V minimum and 3.3066V maximum. This value is laser-trimmed and specified in the Electrical Characteristics table for the 3.3V variant under LM4040B grade.
Does LM4040BEX3-3.3-T require an external output capacitor for stability?
No, LM4040BEX3-3.3-T does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including zero capacitance. This eliminates layout sensitivity and reduces BOM count - a key advantage confirmed in the Applications Information section of the datasheet.
What is the minimum shunt current needed for LM4040BEX3-3.3-T to maintain regulation?
The LM4040BEX3-3.3-T requires a minimum shunt current of 60μA to maintain regulation across its full temperature range (-40°C to +125°C). At +25°C, the typical minimum is 67μA, but the guaranteed worst-case value is 60μA - critical for designing low-power sleep-mode circuits.
Can LM4040BEX3-3.3-T be used in automotive under-hood applications?
LM4040BEX3-3.3-T is rated for -40°C to +125°C operation and qualified for extended industrial environments, but it is not AEC-Q200 qualified. For automotive under-hood use, verify system-level thermal derating: at 125°C ambient and 15mA shunt current, junction temperature must stay ≤150°C - achievable with adequate PCB copper and airflow per the thermal derating curve (2.17mW/°C above +70°C).
What is the wideband noise specification for LM4040BEX3-3.3-T?
The LM4040BEX3-3.3-T exhibits 50μVRMS wideband noise over the 10Hz to 10kHz bandwidth, measured at 100μA shunt current. This value is explicitly listed in the Electrical Characteristics table for the 3.3V variant and directly impacts signal-chain resolution in precision ADC and sensor front-end applications.
LM4040BEX3-3.3-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:
- ±0.2%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 67 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4040BEX3-3.3-T FAQ
1.How can I place an order for LM4040BEX3-3.3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040BEX3-3.3-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 LM4040BEX3-3.3-T reliable?
The price and inventory of LM4040BEX3-3.3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040BEX3-3.3-T is usually 5 days.
3.What payment methods are accepted for LM4040BEX3-3.3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040BEX3-3.3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040BEX3-3.3-T?
LM4040BEX3-3.3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040BEX3-3.3-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 LM4040BEX3-3.3-T?
For technical support, including LM4040BEX3-3.3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040BEX3-3.3-T requirements.
6.How does Aetrix verify that LM4040BEX3-3.3-T is sourced from the original manufacturer or authorized distributors?
All LM4040BEX3-3.3-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 LM4040BEX3-3.3-T meets industry standards.
7.What is the process for return or replacement of LM4040BEX3-3.3-T?
All LM4040BEX3-3.3-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4040BEX3-3.3-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 LM4040BEX3-3.3-T part is unused and in its original packaging.
Return procedure for LM4040BEX3-3.3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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