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Analog Devices Inc./Maxim Integrated LM4050AIX3-3.3
- Part No.:
- LM4050AIX3-3.3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4050AIX3-3.3.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM4050AIX3-3.3 from Maxim Integrated is a precision 3.3V two-terminal shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±15ppm/°C temperature coefficient (max), and stable operation from 60µA to 15mA shunt current. It delivers high-accuracy biasing for ADCs, DACs, and sensor signal chains in portable battery-powered systems.
For engineers reviewing the LM4050AIX3-3.3 datasheet, LM4050AIX3-3.3 pinout, LM4050AIX3-3.3 application, or LM4050AIX3-3.3 equivalent, this page provides verified electrical specs, thermal performance data across –40°C to +125°C, noise characteristics (50µVRMS, 10Hz–10kHz), dynamic impedance (0.3–0.8Ω), and real-world load-transient behavior under varying ISHUNT conditions.
Technical Context
The LM4050AIX3-3.3 uses laser-trimmed bandgap circuitry to maintain a precise 3.3000V reverse breakdown voltage at 100µA, with guaranteed stability over ±15ppm/°C from –40°C to +125°C. Its BiCMOS process enables low 50µVRMS wideband noise and no requirement for output capacitance.
It operates as a two-terminal shunt device: cathode (Pin 1) and anode (Pin 2) form the reference terminals, while Pin 3 is NC (must float or tie to Pin 2). The device clamps to ~0.7V below ground under forward bias up to 10mA, and regulates only when reverse-biased within 60µA–15mA ISHUNT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3000V ±3.0mV at TA = +25°C (A-grade); ensures <±0.1% error in mid-temperature calibration points |
| Initial Accuracy | ±0.1% (A grade); corresponds to ±3.3mV absolute tolerance at 3.3V, critical for 12-bit+ converter references |
| Tempco | ±15ppm/°C max over –40°C to +125°C; contributes ≤±1.5mV drift across full range, enabling industrial-grade stability |
| Shunt Current Range | 60µA to 15mA; supports ultra-low-power sensor biasing and high-current precision regulation without external caps |
| Dynamic Impedance | 0.3Ω to 0.8Ω at 1mA/120Hz; maintains <1mV output shift under 1mA load transients, ideal for dynamic supply rejection |
| Output Noise | 50µVRMS (10Hz–10kHz); low enough to avoid degrading ENOB in 16-bit SAR ADCs powered from same rail |
| Long-Term Stability | 120ppm over 1000 hours; translates to <±0.4mV drift after one year, supporting metrology-grade designs |
Pinout & Package
LM4050AIX3-3.3 is housed in a 3-pin SC70 package (1.8mm × 1.8mm × 0.9mm), 50% smaller than SOT23, optimized for space-constrained PCB layouts in handheld and wearable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Reverse-bias terminal; connects to regulated voltage node; sinks shunt current to maintain VREF |
| Pin 2 (−) | Anode | Reference ground return; forms the 3.3V potential difference with Pin 1; must be tied to system ground |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or be shorted to Pin 2; floating Pin 3 avoids parasitic leakage paths affecting accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% board space vs. SOT23, enabling dense portable PCBs |
| No output capacitor required | Internally compensated for any capacitive load; eliminates BOM cost and layout sensitivity to COUT placement |
| Tolerates capacitive loads | Stable with 0–1µF output capacitance; allows direct connection to ADC input filters or LDO bypass caps |
| Wide operating current range | 60µA minimum start-up current enables use in µA-level sleep-mode circuits without dropout |
| Low wideband noise | 50µVRMS (10Hz–10kHz) minimizes added noise floor in precision analog front-ends |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
Use Scenario: Battery-powered ECG front-end with 16-bit SAR ADC sampling at 1kSPS. IC Role / Device Role / Timing Role: Provides stable 3.3V reference for ADC VREF and op-amp biasing. Use Value: ±0.1% initial accuracy and ±15ppm/°C tempco ensure <±1.5 LSB error across –20°C to +70°C ambient, meeting IEC 60601-2-27 clinical accuracy requirements. |
Use Scenario: 4–20mA loop-powered RTD transmitter operating in factory environments. IC Role / Device Role / Timing Role: Supplies excitation voltage reference and ADC reference in single-supply 3.3V system. Use Value: 60µA–15mA shunt range accommodates varying loop power budgets; 120ppm long-term stability reduces annual calibration frequency. |
| Wearable Health Monitors | Automotive Cabin Sensors |
Use Scenario: Optical heart-rate monitor using photodiode array and low-noise TIA. IC Role / Device Role / Timing Role: Sets bias point for transimpedance amplifier and reference for ADC digitizing analog output. Use Value: 50µVRMS noise prevents SNR degradation in sub-100nA photocurrent measurements; SC70 size fits in <5mm² wearable modules. |
Use Scenario: Humidity/temperature sensor module in automotive HVAC control unit. IC Role / Device Role / Timing Role: Reference source for ratiometric ADC measuring resistive humidity element. Use Value: Guaranteed operation from –40°C to +125°C meets AEC-Q200 Grade 2 requirements; ±0.1% accuracy enables <±2% RH measurement uncertainty. |
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 | 0.5% initial accuracy, ±50ppm/°C tempco, same SC70-3 package, 3.3V nominal | Lower accuracy and higher drift limit use in non-critical biasing; not suitable for 12-bit+ systems | Select TL4050C33IDBZR only when cost sensitivity outweighs precision needs and full temp range stability is not required. |
| ADR3433ARJZ-R7 | Series reference (not shunt); 0.1% accuracy, ±10ppm/°C, requires external bypass cap, SOT23-5 | Needs minimum load current and decoupling; incompatible pinout and topology; higher quiescent current (120µA) | Choose ADR3433ARJZ-R7 only if series topology is mandated by system architecture and PCB layout allows extra pin and capacitor. |
Compared with LM4050AIX3-3.3, TL4050C33IDBZR trades 5× lower accuracy and 3.3× higher tempco for lower cost, while ADR3433ARJZ-R7 offers tighter tempco but demands series configuration, external capacitor, and higher supply current-making LM4050AIX3-3.3 optimal for space-constrained, ultra-low-power shunt-reference designs requiring A-grade precision.
Availability
LM4050AIX3-3.3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition, wearable health monitors, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4050AIX3-3.3 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 (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications, with emphasis on low-power, high-accuracy, and small-footprint solutions.
The LM4050/LM4051 family was engineered specifically for micropower shunt reference applications where board space, thermal stability, and long-term accuracy are critical-targeting portable instrumentation, sensor interfaces, and battery-operated measurement systems.
FAQ
What is the guaranteed operating temperature range for LM4050AIX3-3.3?
The LM4050AIX3-3.3 is fully specified and production-tested from –40°C to +125°C. All key parameters-including output voltage, tempco, dynamic impedance, and noise-are guaranteed across this industrial-grade range, making it suitable for under-hood automotive and outdoor industrial deployments.
Does LM4050AIX3-3.3 require an external output capacitor for stability?
No, LM4050AIX3-3.3 does not require an external output capacitor. Its internal design ensures stability with any capacitive load from 0 to 1µF, eliminating the need for additional components and simplifying layout in noise-sensitive analog sections.
What is the minimum shunt current needed for LM4050AIX3-3.3 to regulate properly?
The LM4050AIX3-3.3 requires a minimum shunt current of 60µA to maintain regulation. Below this threshold, output voltage deviates significantly; design must ensure ISHUNT ≥60µA under all operating conditions, including lowest VS and highest ILOAD.
How does the pin configuration of LM4050AIX3-3.3 differ from standard zener diodes?
LM4050AIX3-3.3 has three pins: Pin 1 (+) is cathode, Pin 2 (−) is anode, and Pin 3 is NC (no connection). Unlike discrete zeners, Pin 3 must either float or connect to Pin 2-leaving it unconnected without tying to Pin 2 risks leakage-induced accuracy loss.
Can LM4050AIX3-3.3 be used in forward-bias mode?
Yes, LM4050AIX3-3.3 can conduct forward current up to 10mA, clamping to approximately 0.7V below ground (i.e., –0.7V relative to anode). This feature enables dual-mode usage-for example, as a reverse-bias reference and forward-bias clamp-but forward operation is not precision-regulated.
LM4050AIX3-3.3 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4050AIX3-3.3 FAQ
1.How can I place an order for LM4050AIX3-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050AIX3-3.3 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 LM4050AIX3-3.3 reliable?
The price and inventory of LM4050AIX3-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050AIX3-3.3 is usually 5 days.
3.What payment methods are accepted for LM4050AIX3-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050AIX3-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050AIX3-3.3?
LM4050AIX3-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050AIX3-3.3 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 LM4050AIX3-3.3?
For technical support, including LM4050AIX3-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050AIX3-3.3 requirements.
6.How does Aetrix verify that LM4050AIX3-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4050AIX3-3.3 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 LM4050AIX3-3.3 meets industry standards.
7.What is the process for return or replacement of LM4050AIX3-3.3?
All LM4050AIX3-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4050AIX3-3.3, 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 LM4050AIX3-3.3 part is unused and in its original packaging.
Return procedure for LM4050AIX3-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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