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Analog Devices Inc./Maxim Integrated LM4050BIX3-3.3
- Part No.:
- LM4050BIX3-3.3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4050BIX3-3.3.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:806
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Product details
Overview
LM4050BIX3-3.3 from Maxim Integrated is a precision 3.3V shunt voltage reference in SC70-3 package, delivering ±0.2% initial accuracy, ±15 ppm/°C temperature coefficient over –40°C to +125°C, and stable regulation across 60 µA–15 mA shunt current. It serves as a compact, low-noise (50 µVRMS) reference for ADC/DAC biasing, portable power monitoring, and battery-fueled instrumentation.
For engineers reviewing the LM4050BIX3-3.3 datasheet, LM4050BIX3-3.3 pinout, LM4050BIX3-3.3 application, or LM4050BIX3-3.3 equivalent, this page delivers verified specifications, validated SC70-3 terminal mapping, real-world operating constraints, and two confirmed alternative references with documented performance trade-offs.
Technical Context
The LM4050BIX3-3.3 uses a laser-trimmed bandgap core to maintain fixed 3.3V reverse breakdown voltage without external capacitors. Its BiCMOS process enables ultra-low quiescent current operation and tolerance of any capacitive load while sustaining <1.0 Ω dynamic impedance at 1 mA.
It operates as a two-terminal shunt device: cathode (Pin 1) and anode (Pin 2) define the reference node, while Pin 3 is NC (must float or tie to Pin 2). The device clamps to ~0.7 V below ground under forward bias up to 10 mA, supporting bidirectional protection in mixed-signal rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300 V ±6.0 mV at +25°C (B-grade accuracy) |
| Initial Accuracy | ±0.2% over full temperature range - ensures ≤±0.7% total error including tempco |
| Tempco | ±15 ppm/°C max - guarantees <±1.5 mV drift from –40°C to +125°C |
| Shunt Current Range | 60 µA to 15 mA - supports micropower sensor nodes and higher-current analog front-ends |
| Output Noise | 50 µVRMS (10 Hz–10 kHz) - suitable for 12-bit+ data converters without filtering |
| Dynamic Impedance | 0.3–0.8 Ω at 1 mA - maintains voltage stability during fast load transients |
| Long-Term Stability | 120 ppm after 1000 hours - predictable aging for calibration-critical systems |
Pinout & Package
LM4050BIX3-3.3 is housed in a 3-pin SC70 surface-mount package (1.8 mm × 1.8 mm), 50% smaller than SOT23. Thermal resistance θJA = 460°C/W; derating begins above +70°C at 2.17 mW/°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Reference output node - connects to regulated rail; sinks shunt current |
| Pin 2 (−) | Anode | Ground reference terminal - establishes 0 V reference point for output |
| Pin 3 (N.C.) | No Connection | Must be left floating or tied to Pin 2; no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8 mm × 1.8 mm area - enables high-density PCB layouts in space-constrained portable designs |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout risk from external stabilization |
| Wide shunt current range | 60 µA minimum start-up current - supports ultra-low-power wake-up circuits and energy-harvesting systems |
| Low wideband noise | 50 µVRMS (10 Hz–10 kHz) - minimizes quantization error in precision measurement signal chains |
| High-temp operation | Guaranteed performance from –40°C to +125°C - suitable for automotive under-hood and industrial control environments |
Applications
| Battery-Fueled Instrumentation | Portable Data Acquisition |
|---|---|
|
Use Scenario: Handheld multimeter measuring 0–3.3V DC signals with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 3.3V reference for ADC VREF input and analog front-end biasing. Use Value: ±0.2% initial accuracy and ±15 ppm/°C tempco ensure <0.1% total reference error across operating temperature, enabling true 16-bit resolution. |
Use Scenario: Wireless sensor node logging temperature and humidity using low-power microcontroller and sigma-delta ADC. IC Role / Device Role / Timing Role: Precision voltage reference for ADC conversion and internal LDO feedback loop. Use Value: 60 µA minimum operating current allows continuous reference operation during deep-sleep MCU states, preserving measurement readiness. |
| Industrial Process Monitoring | Medical Point-of-Care Devices |
|
Use Scenario: 4–20 mA loop-powered transmitter conditioning analog sensor outputs before digitization. IC Role / Device Role / Timing Role: Stable 3.3V reference for DAC generating loop current setpoint and ADC reading sensor bridge. Use Value: 120 ppm long-term stability ensures calibration validity over 12 months, reducing field maintenance frequency. |
Use Scenario: Portable blood glucose meter requiring accurate analog signal conditioning prior to digital processing. IC Role / Device Role / Timing Role: Low-noise (50 µVRMS) reference for photodiode amplifier and 12-bit ADC reference rail. Use Value: Ultra-low noise prevents signal degradation in sub-millivolt-level biosensor measurements, improving diagnostic confidence. |
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) 3-pin shunt; 0.5% initial accuracy; 100 ppm/°C tempco; requires external resistors for 3.3V setting | Less precise and less stable over temperature; needs resistor network and layout area | Select when adjustable output or higher voltage capability is needed; not drop-in for fixed 3.3V use |
| ADR3433ARJZ-R7 | 3.3V series reference in SOT23; 0.1% initial accuracy; 10 ppm/°C tempco; 5 µA typical quiescent current | Higher accuracy and lower tempco but requires series configuration and external bypass capacitor | Select when lowest possible drift and series topology compatibility are prioritized over shunt simplicity |
Compared with TLVH431ACDBVR and ADR3433ARJZ-R7, LM4050BIX3-3.3 offers optimal balance of fixed-output convenience, SC70 size, and B-grade precision-making it ideal for space-constrained, battery-operated systems where shunt topology simplifies design and reduces component count.
Availability
LM4050BIX3-3.3 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and medical point-of-care devices requiring stable component supply with guaranteed long-term availability.
Supply support for LM4050BIX3-3.3 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, automotive, and medical applications.
The LM4050/LM4051 family was engineered to deliver high-accuracy, micropower shunt references in ultra-small packages for battery-powered and space-constrained systems.
FAQ
What is the maximum shunt current the LM4050BIX3-3.3 can safely handle?
The LM4050BIX3-3.3 supports a continuous shunt current up to 15 mA under normal operation. Absolute maximum rating is 20 mA - exceeding this risks permanent damage. At 15 mA and 3.3 V, power dissipation reaches 49.5 mW; thermal derating must be applied above +70°C ambient per the SC70 package's 2.17 mW/°C spec. Always verify worst-case ISHUNT using RS sizing equations from the datasheet.
Can the LM4050BIX3-3.3 operate without an output capacitor?
Yes, the LM4050BIX3-3.3 is internally compensated and does not require an output capacitor for stability. It remains stable with any capacitive load - including decoupling caps, ADC input capacitance, or long PCB traces. This eliminates capacitor-related BOM cost, placement uncertainty, and potential oscillation issues common with older shunt references.
What does the 'B' and 'X3' in LM4050BIX3-3.3 signify?
In LM4050BIX3-3.3, 'B' denotes the 0.2% initial accuracy grade, 'X3' specifies the 3-pin SC70 package, and '3.3' indicates the nominal 3.300 V reverse breakdown voltage. The 'I' signifies industrial temperature range (–40°C to +125°C), and 'T' (implied in ordering code) indicates tape-and-reel packaging.
How does the LM4050BIX3-3.3 behave under forward bias?
When forward biased (anode > cathode), the LM4050BIX3-3.3 behaves like a silicon diode with ~0.7 V forward voltage drop and supports up to 10 mA forward current. This characteristic enables bidirectional rail protection in systems subject to reverse polarity or transient overvoltage events on the reference node.
Is Pin 3 of the LM4050BIX3-3.3 functional or optional?
Pin 3 of the LM4050BIX3-3.3 is explicitly designated N.C. (No Connection) and has no internal connection. Per the datasheet, it must either be left floating or tied directly to Pin 2 (anode); leaving it unconnected or connecting it elsewhere may cause unpredictable behavior or violate absolute maximum ratings.
LM4050BIX3-3.3 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:
- ±0.2%
- 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
LM4050BIX3-3.3 FAQ
1.How can I place an order for LM4050BIX3-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050BIX3-3.3 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 LM4050BIX3-3.3 reliable?
The price and inventory of LM4050BIX3-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050BIX3-3.3 is usually 5 days.
3.What payment methods are accepted for LM4050BIX3-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050BIX3-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050BIX3-3.3?
LM4050BIX3-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050BIX3-3.3 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 LM4050BIX3-3.3?
For technical support, including LM4050BIX3-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050BIX3-3.3 requirements.
6.How does Aetrix verify that LM4050BIX3-3.3 is sourced from the original manufacturer or authorized distributors?
All LM4050BIX3-3.3 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 LM4050BIX3-3.3 meets industry standards.
7.What is the process for return or replacement of LM4050BIX3-3.3?
All LM4050BIX3-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM4050BIX3-3.3, 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 LM4050BIX3-3.3 part is unused and in its original packaging.
Return procedure for LM4050BIX3-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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