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Analog Devices Inc./Maxim Integrated LM4050AEX3-3.3
- Part No.:
- LM4050AEX3-3.3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4050AEX3-3.3.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,761
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Product details
Overview
LM4050AEX3-3.3 from Maxim Integrated is a precision 3.3V two-terminal shunt voltage reference in a 3-pin SC70 package, featuring 0.1% initial accuracy, ±15ppm/°C temperature coefficient (max), 60µA to 15mA operating current range, and 50µVRMS wideband noise (10Hz–10kHz). It delivers stable reverse breakdown voltage for high-accuracy analog-to-digital conversion in portable battery-powered instrumentation.
For engineers reviewing the LM4050AEX3-3.3 datasheet, LM4050AEX3-3.3 pinout, LM4050AEX3-3.3 application, or LM4050AEX3-3.3 equivalent, key selection criteria include guaranteed -40°C to +125°C operation, no external capacitor requirement, low dynamic impedance (0.3Ω typ), and compatibility with capacitive loads in space-constrained designs.
Technical Context
The LM4050AEX3-3.3 implements a laser-trimmed bandgap core to maintain precise 3.300V reverse breakdown voltage across its cathode-anode terminals. Its two-terminal architecture eliminates need for dedicated supply rails or control logic, simplifying integration into biasing, calibration, and feedback networks.
It operates as a passive shunt regulator: sinking variable current (60µA–15mA) through an external series resistor to hold VR constant under varying load and input conditions. Stability is maintained without output capacitance, and it tolerates any capacitive load-enabling direct use with ADC reference inputs and op-amp feedback nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±3.0mV at TA = +25°C; ensures accurate scaling for 12-bit+ SAR ADCs |
| Initial Accuracy | ±0.1% (A-grade); enables single-point calibration in factory programming |
| Tempco | ±15ppm/°C max over -40°C to +125°C; supports industrial-grade sensor signal chains |
| Operating Current | 60µA to 15mA shunt range; allows ultra-low-power sleep modes and high-current regulation |
| Dynamic Impedance | 0.3Ω typ at 1mA; minimizes voltage shift during transient load changes |
| Wideband Noise | 50µVRMS (10Hz–10kHz); suitable for precision 16-bit delta-sigma ADC references |
| Long-Term Stability | 120ppm after 1000h; reduces recalibration frequency in field-deployed equipment |
Pinout & Package
Package: 3-pin SC70 (1.8mm × 1.8mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to system ground or low-impedance return path; forms cathode-to-anode reference junction |
| 2 (−) | Cathode / Negative Terminal | Reference output node; voltage measured between Pin 2 and Pin 1 defines VR = 3.3V |
| 3 (N.C.) | No Connection | Must be left unconnected or tied to Pin 2; floating connection avoids parasitic leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70 footprint | 50% smaller than SOT23; saves >0.5mm² PCB area in wearables and IoT sensors |
| No output capacitor required | Internally compensated; eliminates BOM cost and layout risk of external CREF |
| Capacitive load tolerance | Stable with any value of output capacitance; simplifies ADC reference decoupling |
| Micropower operation | 60µA minimum shunt current enables <1µW standby power in battery-gauging circuits |
| High-temp reliability | Guaranteed operation to +125°C; qualified for automotive cabin and industrial motor-control environments |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with 24-bit delta-sigma ADC requiring stable 3.3V reference for ±2.5V input range. IC Role / Device Role / Timing Role: Shunt reference providing precision VREF to ADC's internal reference buffer and PGA gain-setting resistors. Use Value: 0.1% initial accuracy and ±15ppm/°C tempco ensure <0.01% full-scale error drift over medical operating temperature range. | Use Scenario: Modular PLC analog input module measuring 4–20mA loop signals with isolated 3.3V microcontroller domain. IC Role / Device Role / Timing Role: Primary voltage reference for isolated sigma-delta ADC and DAC calibration circuitry. Use Value: 50µVRMS noise floor and 0.3Ω dynamic impedance prevent quantization noise coupling into measurement channel. |
| Automotive Cabin Controllers | Wireless Sensor Nodes |
Use Scenario: HVAC control unit with thermistor-based temperature sensing and CAN interface, operating from 12V battery with LDO dropout margin. IC Role / Device Role / Timing Role: Reference source for microcontroller ADC monitoring of NTC/PTC sensors and supply rail monitors. Use Value: Guaranteed -40°C to +125°C operation and 120ppm long-term stability reduce field failure rates in thermal cycling environments. | Use Scenario: BLE-enabled environmental sensor node powered by coin cell, sampling temperature/humidity every 5 seconds. IC Role / Device Role / Timing Role: Low-quiescent reference enabling sub-1µA average system current during deep-sleep intervals. Use Value: 60µA minimum operating current allows continuous reference biasing while maintaining multi-year battery life. |
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 | Adjustable (2.5V–36V) vs. fixed 3.3V; 0.5% initial accuracy; higher 200µA min current | Requires external resistor divider; less suitable for space-constrained fixed-VREF designs | Select when programmability or wider voltage range outweighs size and accuracy requirements |
| ADR3433ARJZ-R7 | 3.3V fixed; 0.1% accuracy; 3-pin SOT23 package; 30ppm/°C tempco (vs. 15ppm/°C) | Larger footprint (2.9mm × 1.6mm vs. 1.8mm × 1.8mm); higher thermal drift affects high-precision measurements | Prefer for legacy SOT23 layouts where SC70 rework is prohibitive |
Compared with TLVH431ACDBVR and ADR3433ARJZ-R7, the LM4050AEX3-3.3 offers superior thermal stability in minimal area, making it optimal for new designs prioritizing accuracy, size, and low-power operation over adjustability or package compatibility.
Availability
LM4050AEX3-3.3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, and automotive cabin controllers requiring stable component supply with guaranteed long-term availability.
Supply support for LM4050AEX3-3.3 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, sensing, and communication applications.
The LM4050/LM4051 product line was designed for high-accuracy, low-power shunt reference needs in space-constrained, battery-operated, and industrial systems demanding wide-temperature performance.
FAQ
What is the guaranteed operating temperature range for the LM4050AEX3-3.3?
The LM4050AEX3-3.3 is specified and guaranteed over -40°C to +125°C. All electrical parameters-including 3.300V output voltage, ±15ppm/°C temperature coefficient, and 60µA minimum operating current-are validated across this full industrial temperature range per Maxim's production test protocol.
Does the LM4050AEX3-3.3 require an external output capacitor for stability?
No, the LM4050AEX3-3.3 does not require an external output capacitor. Its internal design ensures stability with any capacitive load, including direct connection to ADC reference pins or op-amp inputs. This eliminates BOM cost, layout complexity, and potential resonance issues associated with external capacitors.
What is the maximum shunt current the LM4050AEX3-3.3 can safely handle?
The LM4050AEX3-3.3 has an absolute maximum reverse current rating of 20mA. For reliable long-term operation, shunt current should be limited to ≤15mA under all conditions-including worst-case supply voltage and minimum load-as specified in the Absolute Maximum Ratings table and typical operating circuit guidelines.
How does the LM4050AEX3-3.3 differ from the LM4050BEX3-3.3 variant?
The LM4050AEX3-3.3 offers 0.1% initial accuracy and ±15ppm/°C temperature coefficient, while the LM4050BEX3-3.3 provides 0.2% initial accuracy and the same ±15ppm/°C tempco. Both share identical SC70 packaging, pinout, and operating current range, but the 'A' grade delivers tighter DC precision for metrology-grade applications.
Can Pin 3 of the LM4050AEX3-3.3 be left floating or must it be connected?
Pin 3 (N.C.) of the LM4050AEX3-3.3 may be left unconnected or connected to Pin 2 (cathode). The datasheet explicitly states that either configuration is acceptable; however, tying Pin 3 to Pin 2 is recommended to prevent potential leakage currents or ESD susceptibility in high-reliability designs.
LM4050AEX3-3.3 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:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°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
LM4050AEX3-3.3 FAQ
1.How can I place an order for LM4050AEX3-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050AEX3-3.3 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 LM4050AEX3-3.3 reliable?
The price and inventory of LM4050AEX3-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050AEX3-3.3 is usually 5 days.
3.What payment methods are accepted for LM4050AEX3-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050AEX3-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050AEX3-3.3?
LM4050AEX3-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050AEX3-3.3 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 LM4050AEX3-3.3?
For technical support, including LM4050AEX3-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050AEX3-3.3 requirements.
6.How does Aetrix verify that LM4050AEX3-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4050AEX3-3.3 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 LM4050AEX3-3.3 meets industry standards.
7.What is the process for return or replacement of LM4050AEX3-3.3?
All LM4050AEX3-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4050AEX3-3.3, 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 LM4050AEX3-3.3 part is unused and in its original packaging.
Return procedure for LM4050AEX3-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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