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Analog Devices Inc./Maxim Integrated LM4050BIX3-3.3-T
- Part No.:
- LM4050BIX3-3.3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4050BIX3-3.3-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
LM4050BIX3-3.3-T from Maxim Integrated is a precision 3.3V two-terminal shunt voltage reference in SC70-3 package, featuring 0.2% initial accuracy, ±15ppm/°C temperature coefficient (max), 60µA–15mA operating current range, and 50µVRMS wideband noise (10Hz–10kHz). It serves as a stable reference for ADCs, DACs, and power-supply monitoring in space-constrained portable systems.
For engineers reviewing the LM4050BIX3-3.3-T datasheet, LM4050BIX3-3.3-T pinout, LM4050BIX3-3.3-T application, or LM4050BIX3-3.3-T equivalent, this page delivers verified specifications, validated SC70-3 terminal mapping, real-world use cases in battery-powered instrumentation, and confirmed alternative options with documented performance trade-offs.
Technical Context
The LM4050BIX3-3.3-T implements a laser-trimmed bandgap core to deliver fixed 3.3V reverse breakdown voltage with no external capacitor required. Its BiCMOS process enables low dynamic impedance (0.3–0.8Ω) and stable regulation across -40°C to +125°C.
It operates as a two-terminal shunt device: cathode (+) and anode (−) establish the reference node, while pin 3 is NC (must float or tie to pin 2). Regulation is maintained by sinking 60µA–15mA of shunt current, with output voltage change ≤8.0mV over 1–15mA current variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±6.0mV at +25°C (B-grade); ensures precise biasing for 3.3V logic and analog signal chains |
| Initial Accuracy | ±0.2% (±6.6mV) at +25°C; supports high-resolution data conversion without calibration |
| Tempco | ±15ppm/°C max over -40°C to +125°C; contributes ≤±1.5mV drift across full industrial range |
| Operating Current | 60µA to 15mA shunt range; enables micropower operation in sleep mode and robust regulation under load transients |
| Output Noise | 50µVRMS (10Hz–10kHz); low enough for 16-bit SAR ADC reference without filtering |
| Dynamic Impedance | 0.3–0.8Ω at 1mA/120Hz; minimizes output voltage perturbation during fast load steps |
| Long-Term Stability | 120ppm after 1000 hours; predictable aging behavior for mission-critical sensor front-ends |
Pinout & Package
LM4050BIX3-3.3-T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is unconnected (NC) and must be left floating or tied to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Cathode | Reference output node; connects to regulated voltage rail or ADC REF+ input |
| 2 (−) | Anode | Ground reference return path; forms shunt current loop with external series resistor |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to pin 2; not electrically active |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves >50% PCB space vs. SOT23; ideal for wearables and compact modules |
| No output capacitor required | Internally compensated for stability with any capacitive load; eliminates BOM cost and layout risk |
| Wide shunt-current capability | 60µA minimum start-up current enables operation from weak bias sources (e.g., high-Z dividers) |
| Low wideband noise | 50µVRMS (10Hz–10kHz) directly supports 16-bit precision without external filtering |
| Laser-trimmed accuracy | 0.2% initial tolerance achieved via on-die resistor trimming; avoids post-assembly calibration |
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 and op-amp biasing. Use Value: ±6.6mV initial error and ±1.5mV tempco ensure <0.05% total reference uncertainty over full operating range. |
Use Scenario: Modular PLC analog input module measuring 4–20mA current loops. IC Role / Device Role / Timing Role: Precision reference for current-to-voltage conversion and ADC reference. Use Value: 60µA min operating current allows direct biasing from loop-powered circuitry without auxiliary supply. |
| Notebook System Monitoring | Automotive Body Control Unit |
|
Use Scenario: Real-time monitoring of 3.3V I/O rail voltage in ultrabook power management IC. IC Role / Device Role / Timing Role: Reference for internal ADC measuring rail health and thermal margin. Use Value: SC70-3 size fits tight routing near PMIC; 120ppm long-term stability ensures accurate lifetime diagnostics. |
Use Scenario: Cabin temperature sensor interface in 12V automotive body control module. IC Role / Device Role / Timing Role: Stable reference for thermistor measurement bridge and microcontroller ADC. Use Value: -40°C to +125°C guaranteed operation supports under-hood placement; no capacitor simplifies AEC-Q200 compliance. |
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-terminal shunt; 0.5% initial accuracy; 90ppm/°C tempco; requires external resistors | Needs design-in effort for 3.3V setting; higher tempco increases drift in wide-temp environments | Choose when adjustable output or higher voltage capability is needed; avoid if board space or tempco is critical |
| REF3033AIDBZR | 3.3V series reference; 0.2% initial accuracy; 50ppm/°C tempco; 50µA quiescent current; requires output capacitor | Series topology demands dedicated ground path; output cap adds BOM and layout complexity | Prefer for low-noise, low-dropout series applications where load regulation > shunt current headroom matters |
Compared with TLVH431ACDBVR and REF3033AIDBZR, LM4050BIX3-3.3-T offers fixed 3.3V output with no external components, smallest SC70 footprint, and lowest system-level BOM count-making it optimal for ultra-compact, low-power shunt reference designs.
Availability
LM4050BIX3-3.3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, notebook system monitoring, and automotive body control units requiring stable component supply with guaranteed -40°C to +125°C operation.
Supply support for LM4050BIX3-3.3-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) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and computing applications.
The LM4050/LM4051 family delivers micropower shunt references optimized for space-constrained, battery-operated systems needing high accuracy and wide temperature stability without external compensation.
FAQ
What is the maximum operating temperature range for LM4050BIX3-3.3-T?
The LM4050BIX3-3.3-T is fully specified and guaranteed over -40°C to +125°C ambient temperature. Its junction temperature remains within safe limits up to +150°C, and the SC70 package's thermal derating (2.17mW/°C above +70°C) supports reliable operation in high-temperature industrial environments when power dissipation is managed per the datasheet equations.
Does LM4050BIX3-3.3-T require an external output capacitor?
No, LM4050BIX3-3.3-T does not require an external output capacitor for stability. It is internally compensated and remains stable with any capacitive load, including direct connection to ADC reference inputs or large bypass caps-eliminating a common source of layout-induced reference noise and drift.
What is the minimum shunt current needed for LM4050BIX3-3.3-T to regulate properly?
The LM4050BIX3-3.3-T requires a minimum shunt current of 67µA to maintain regulation at all temperatures. This value is specified in the Electrical Characteristics table for the 3.3V version and ensures stable 3.300V output even at -40°C and +125°C, enabling reliable startup from high-impedance bias networks.
How does the pin configuration of LM4050BIX3-3.3-T differ from standard zener diodes?
Unlike discrete zeners, LM4050BIX3-3.3-T has three pins: pin 1 (+) is cathode, pin 2 (−) is anode, and pin 3 is NC (no connection). Pin 3 must be left floating or tied to pin 2-never driven-ensuring correct bandgap operation and preventing parametric shift or damage.
What is the wideband noise specification of LM4050BIX3-3.3-T and how does it impact ADC performance?
LM4050BIX3-3.3-T delivers 50µVRMS wideband noise (10Hz–10kHz), measured at 100µA shunt current. This low noise floor supports 16-bit ADCs without additional filtering-e.g., a 3.3V reference with 50µVRMS noise contributes <0.0008 LSB RMS noise to a 16-bit converter, preserving effective resolution.
LM4050BIX3-3.3-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:
- 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-T FAQ
1.How can I place an order for LM4050BIX3-3.3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050BIX3-3.3-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 LM4050BIX3-3.3-T reliable?
The price and inventory of LM4050BIX3-3.3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050BIX3-3.3-T is usually 5 days.
3.What payment methods are accepted for LM4050BIX3-3.3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050BIX3-3.3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050BIX3-3.3-T?
LM4050BIX3-3.3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050BIX3-3.3-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 LM4050BIX3-3.3-T?
For technical support, including LM4050BIX3-3.3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050BIX3-3.3-T requirements.
6.How does Aetrix verify that LM4050BIX3-3.3-T is sourced from the original manufacturer or authorized distributors?
All LM4050BIX3-3.3-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 LM4050BIX3-3.3-T meets industry standards.
7.What is the process for return or replacement of LM4050BIX3-3.3-T?
All LM4050BIX3-3.3-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4050BIX3-3.3-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 LM4050BIX3-3.3-T part is unused and in its original packaging.
Return procedure for LM4050BIX3-3.3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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