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Analog Devices Inc./Maxim Integrated LM4050CIX3-2.1-T
- Part No.:
- LM4050CIX3-2.1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4050CIX3-2.1-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
LM4050CIX3-2.1-T from Maxim Integrated is a precision 2.048V shunt voltage reference in SC70-3 package, designed for space-constrained systems requiring stable reference voltage under varying load (60µA–15mA), temperature (−40°C to +125°C), and supply conditions. It delivers 0.5% initial accuracy, ±15ppm/°C tempco, and 28µVRMS wideband noise (10Hz–10kHz), enabling high-resolution ADC/DAC biasing in portable instrumentation.
For engineers reviewing the LM4050CIX3-2.1-T datasheet, LM4050CIX3-2.1-T pinout, LM4050CIX3-2.1-T application, or LM4050CIX3-2.1-T equivalent, this page provides verified specifications, SC70-3 terminal mapping, real-world use cases in battery-powered measurement systems, and validated alternative parts with documented performance trade-offs.
Technical Context
The LM4050CIX3-2.1-T implements a laser-trimmed bandgap core with BiCMOS process, delivering fixed 2.048V reverse breakdown voltage without external stabilization capacitors. Its shunt architecture sinks current across an external series resistor to maintain regulation, supporting operation from 60µA minimum shunt current up to 15mA maximum.
Guaranteed over −40°C to +125°C, it achieves ±15ppm/°C typical temperature coefficient and maintains low dynamic impedance (≤0.9Ω at 1mA) to suppress output voltage drift under load transients. Pin 3 is NC and must be left floating or tied to pin 2 per datasheet layout guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.048V nominal; enables precise 12-bit ADC full-scale alignment with VREF = VDD/2 in 3.3V or 5V systems. |
| Initial Accuracy | ±10mV (0.5%); ensures ≤1 LSB error in 12-bit converters at room temperature. |
| Tempco | ±15ppm/°C max; contributes ≤0.15% voltage shift over full −40°C to +125°C range. |
| Shunt Current Range | 60µA to 15mA; supports ultra-low-power sensor interfaces and high-current DAC references. |
| Output Noise | 28µVRMS (10Hz–10kHz); limits RMS quantization uncertainty to <0.03 LSB in 16-bit 2.048V-range ADCs. |
| Dynamic Impedance | 0.3–0.9Ω at 1mA; minimizes load-induced voltage droop during fast current steps. |
| Long-Term Stability | 120ppm after 1000h; corresponds to ~0.025% drift over 1 year in continuous operation. |
Pinout & Package
LM4050CIX3-2.1-T uses the 3-pin SC70-3 package (1.8mm × 1.8mm), optimized for high-density PCB layouts. Pin 1 is the anode (+), pin 2 is the cathode (−), and pin 3 is no-connect-must be left floating or shorted to pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode terminal | Connected to system ground or low-impedance return path; defines reference potential node. |
| 2 (−) | Cathode terminal | Connected to regulated output node; sinks shunt current to maintain 2.048V across terminals. |
| 3 (N.C.) | No connection | Must remain unconnected or tied to pin 2; floating pin 3 prevents parasitic leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | Reduces board area by 50% vs. SOT23-3, critical for wearable and handheld medical devices. |
| No output capacitor required | Eliminates BOM cost and layout area for stability compensation; simplifies design validation. |
| Tolerates capacitive loads | Stable with any output capacitance value, enabling direct connection to ADC input caps or LDO bypass networks. |
| Wide operating current range | Supports both micropower sensor nodes (60µA) and high-speed data acquisition (15mA) without redesign. |
| Low 28µVRMS noise | Preserves signal integrity in precision analog front-ends where SNR > 100dB is required. |
Applications
| Portable Data Loggers | Industrial Sensor Transmitters |
|---|---|
Use Scenario: Battery-powered environmental monitoring units logging temperature, humidity, and pressure over multi-year deployments. IC Role / Device Role / Timing Role: Provides stable 2.048V reference for 16-bit sigma-delta ADCs converting sensor outputs. Use Value: Enables <0.01% total unadjusted error over temperature and lifetime, meeting ISO 17025 calibration traceability requirements. |
Use Scenario: 4–20mA loop-powered field instruments measuring flow, level, or vibration in hazardous areas. IC Role / Device Role / Timing Role: Supplies precision reference for DAC-based current loop control and sensor excitation circuits. Use Value: Maintains 0.5% accuracy across −40°C to +85°C ambient, eliminating need for on-site recalibration. |
| Medical Wearables | Automotive Cabin Sensors |
Use Scenario: ECG and pulse oximetry patches requiring sub-microamp quiescent current and clinical-grade measurement fidelity. IC Role / Device Role / Timing Role: Sets reference voltage for low-noise instrumentation amplifiers and SAR ADCs sampling biopotentials. Use Value: 28µVRMS noise ensures ≥110dB SNR in 100Hz bandwidth, satisfying IEC 60601-2-47 ECG accuracy mandates. |
Use Scenario: Occupancy and air quality sensors mounted near HVAC vents with rapid ambient temperature swings. IC Role / Device Role / Timing Role: References analog signal conditioning stages for CO₂, VOC, and particulate matter detection. Use Value: ±15ppm/°C tempco limits reference drift to <0.02% over −40°C to +105°C, preserving sensor linearity. |
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 1.24V–18V output; 0.5% initial accuracy; 100ppm/°C tempco; SOT23-3 package. | Requires two external resistors for 2.048V setting; higher tempco increases drift in wide-temperature industrial use. | Select when adjustable output or higher voltage capability is needed; avoid for precision 2.048V fixed-reference designs. |
| ADR3420ARJZ-R7 | Fixed 2.048V; 0.1% initial accuracy; 10ppm/°C tempco; SOT23-3 package; 50µA–15mA operating range. | Higher accuracy and lower tempco than LM4050CIX3-2.1-T but requires 50µA minimum current and has 45µVRMS noise. | Prefer for metrology-grade systems where 0.1% tolerance and 10ppm/°C stability outweigh noise sensitivity. |
Compared with TLVH431ACDBVR and ADR3420ARJZ-R7, LM4050CIX3-2.1-T offers the optimal balance of SC70 size, 28µVRMS noise, and guaranteed 60µA startup for ultra-low-power battery systems-while ADR3420ARJZ-R7 suits higher-accuracy needs and TLVH431ACDBVR supports voltage flexibility at the cost of precision and thermal stability.
Availability
LM4050CIX3-2.1-T is available at Aetrix Electronics and suitable for portable data loggers, industrial sensor transmitters, medical wearables, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4050CIX3-2.1-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, medical, and communications applications, emphasizing low power, small size, and high reliability.
The LM4050/LM4051 family targets space-constrained, battery-operated systems needing micropower shunt references with guaranteed accuracy and stability across −40°C to +125°C-specifically for ADC/DAC biasing, sensor excitation, and closed-loop control feedback.
FAQ
What is the exact output voltage tolerance of LM4050CIX3-2.1-T at +25°C?
The LM4050CIX3-2.1-T has a nominal output voltage of 2.048V with ±10mV (0.5%) initial tolerance at +25°C, corresponding to a range of 2.038V to 2.058V. This is specified for the 'C' grade in the Electrical Characteristics table for 2.048V devices, and applies strictly at room temperature before thermal drift or long-term aging effects.
Does LM4050CIX3-2.1-T require an external capacitor for stability?
No, LM4050CIX3-2.1-T does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or LDO bypass networks-eliminating layout constraints and BOM overhead associated with compensation components.
What is the minimum shunt current needed for LM4050CIX3-2.1-T to regulate properly?
The LM4050CIX3-2.1-T requires a minimum shunt current of 60µA to maintain regulation across its full temperature range. Below this threshold, output voltage may deviate beyond specification; design must ensure ISHUNT ≥ 60µA even at lowest supply voltage and highest load current per the RS calculation guidelines in the datasheet.
How does the SC70-3 package of LM4050CIX3-2.1-T compare to SOT23-3 variants?
The LM4050CIX3-2.1-T uses SC70-3 (1.8mm × 1.8mm), which is 50% smaller than the SOT23-3 variant (LM4050CEM3-2.1+T). Both share identical electrical specs, but SC70 enables higher PCB density in compact devices like hearing aids and IoT edge nodes-though thermal dissipation is reduced (174mW vs. 320mW at +70°C).
Can pin 3 of LM4050CIX3-2.1-T be left unconnected or must it be grounded?
Pin 3 of LM4050CIX3-2.1-T is designated N.C. (no connection) and must either be left floating or connected to pin 2 (cathode). The datasheet explicitly prohibits connecting pin 3 to any other node-including ground or supply-as doing so may introduce leakage paths or degrade long-term stability and accuracy.
LM4050CIX3-2.1-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):
- 2.048V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 28µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4050CIX3-2.1-T FAQ
1.How can I place an order for LM4050CIX3-2.1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4050CIX3-2.1-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 LM4050CIX3-2.1-T reliable?
The price and inventory of LM4050CIX3-2.1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4050CIX3-2.1-T is usually 5 days.
3.What payment methods are accepted for LM4050CIX3-2.1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4050CIX3-2.1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4050CIX3-2.1-T?
LM4050CIX3-2.1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4050CIX3-2.1-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 LM4050CIX3-2.1-T?
For technical support, including LM4050CIX3-2.1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4050CIX3-2.1-T requirements.
6.How does Aetrix verify that LM4050CIX3-2.1-T is sourced from the original manufacturer or authorized distributors?
All LM4050CIX3-2.1-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 LM4050CIX3-2.1-T meets industry standards.
7.What is the process for return or replacement of LM4050CIX3-2.1-T?
All LM4050CIX3-2.1-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4050CIX3-2.1-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 LM4050CIX3-2.1-T part is unused and in its original packaging.
Return procedure for LM4050CIX3-2.1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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