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Analog Devices Inc./Maxim Integrated LM4051AIX3-1.2-T
- Part No.:
- LM4051AIX3-1.2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4051AIX3-1.2-T.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LM4051AIX3-1.2-T from Maxim Integrated is a precision 1.225V shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±15ppm/°C temperature coefficient (typ), 60µA–15mA operating current range, and 28µVRMS wideband noise (10Hz–10kHz). It serves as a stable, low-power reference in battery-powered analog signal chains and ADC/DAC biasing circuits.
For engineers reviewing the LM4051AIX3-1.2-T datasheet, LM4051AIX3-1.2-T pinout, LM4051AIX3-1.2-T application, or LM4051AIX3-1.2-T equivalent, key selection criteria include guaranteed -40°C to +125°C operation, no external capacitor requirement, ultra-small 1.8mm × 1.8mm footprint, and compatibility with capacitive loads in space-constrained portable systems.
Technical Context
The LM4051AIX3-1.2-T implements a laser-trimmed bandgap core with BiCMOS process technology to deliver stable reverse breakdown voltage under varying load and temperature conditions. Its two-terminal shunt architecture operates without series pass elements, sinking current through an external resistor to maintain regulation.
It achieves thermal stability via curvature-compensated bandgap design, with output voltage drift bounded by ±15ppm/°C (typ) over full industrial temperature range and long-term stability of 120ppm after 1000 hours. Dynamic impedance remains ≤1.5Ω at 1mA, enabling robust performance across 60µA–15mA shunt current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V ±1.2mV at +25°C (LM4051A grade); enables precise 12-bit+ ADC reference in low-voltage systems |
| Initial Accuracy | ±0.1% (max) at +25°C; eliminates need for system-level calibration in portable instrumentation |
| Tempco | ±15ppm/°C (typ), ≤50ppm/°C (max) over -40°C to +125°C; ensures <±0.6% total drift across full range |
| Operating Current | 60µA to 15mA shunt range; supports micropower sleep modes and high-current precision sensing |
| Output Noise | 28µVRMS (10Hz–10kHz); suitable for high-resolution data acquisition without additional filtering |
| Dynamic Impedance | ≤1.5Ω at 1mA, 120Hz; maintains regulation stability during fast load transients |
| Long-Term Stability | 120ppm (1000h); predictable aging behavior for mission-critical embedded systems |
Pinout & Package
LM4051AIX3-1.2-T uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23, optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Reference Terminal | Connected to system ground or low-impedance return path; defines cathode-to-anode voltage polarity |
| 2 (−) | Cathode / Negative Reference Terminal | Output node where regulated 1.225V appears; sinks shunt current to maintain voltage |
| 3 (N.C.) | No Connection | Must be left floating or tied to Pin 2; no internal connection - not a trim or enable pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint reduces board area by 50% vs. SOT23, critical for wearables and compact sensors |
| No output capacitor required | Internally compensated for stability with any capacitive load - eliminates BOM cost and layout risk |
| Wide shunt current range | 60µA minimum start-up current enables operation in µA-scale power budgets (e.g., coin-cell IoT nodes) |
| Low 28µVRMS noise | Enables direct use in 16-bit SAR ADC references without external low-noise LDO or filter stages |
| Guaranteed -40°C to +125°C operation | Validated performance across automotive under-hood and industrial control environments without derating |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) front-end with 16-bit ADC sampling analog sensor output. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for ratiometric ADC conversion, rejecting supply ripple and temperature drift. Use Value: Enables ±0.5% measurement accuracy over -20°C to +50°C ambient with no recalibration, extending device calibration interval. | Use Scenario: Environmental data logger powered by CR2032 coin cell, recording temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Supplies precision reference to low-power SAR ADC during brief active measurement bursts. Use Value: 60µA minimum operating current allows reference to remain active during sleep, reducing wake-up latency and improving timestamp accuracy. |
| Industrial Process Transmitters | Wearable Health Monitors |
Use Scenario: 4–20mA loop-powered pressure transmitter with HART digital overlay. IC Role / Device Role / Timing Role: References the DAC that sets loop current; must survive 125°C ambient and tolerate EMI from field wiring. Use Value: Guaranteed operation to +125°C and inherent noise immunity support reliable 12-bit resolution in harsh factory environments. | Use Scenario: Optical heart-rate sensor module in smartwatch with photodiode amplifier and ADC. IC Role / Device Role / Timing Role: Bias reference for transimpedance amplifier and ADC reference rail in ultra-thin form factor. Use Value: SC70-3 size fits within 3.5mm watch bezel height; 28µVRMS noise prevents pulse waveform distortion in PPG signal chain. |
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 min) vs. fixed 1.225V; higher 100µA min current; 100ppm/°C tempco (max) | Requires external resistors for 1.225V setting; less accurate over temperature; larger SOT23-6 footprint | Select when adjustable output or higher current capability is needed; avoid if 1.225V precision and SC70 size are mandatory |
| REF3012AIDBZR | Series reference (not shunt); 1.2V output; 50ppm/°C tempco; requires input headroom; 50µA quiescent current | Needs ≥2.2V supply; cannot sink current; incompatible with shunt-based regulator topologies | Choose only for series-reference architectures; not drop-in compatible due to topology and pinout mismatch |
Compared with TLVH431ACDBVR and REF3012AIDBZR, the LM4051AIX3-1.2-T delivers superior initial accuracy (0.1% vs. 0.5–1.0%), lower noise (28µVRMS vs. 40–60µVRMS), and true two-terminal simplicity in the smallest available package - making it optimal for fixed-voltage, space- and power-constrained shunt reference designs.
Availability
LM4051AIX3-1.2-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial process transmitters, and wearable health monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4051AIX3-1.2-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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.
The LM4050/LM4051 product line was designed to deliver high-accuracy, low-power shunt voltage references in ultra-compact packages for space- and energy-constrained portable and embedded systems.
FAQ
What is the exact output voltage tolerance of LM4051AIX3-1.2-T at +25°C?
The LM4051AIX3-1.2-T has a reverse breakdown voltage of 1.225V with ±1.2mV (±0.1%) tolerance at +25°C, corresponding to the 'A' grade accuracy specification per the datasheet's Electrical Characteristics table for the 1.225V variant.
Does LM4051AIX3-1.2-T require an external capacitor for stability?
No, the LM4051AIX3-1.2-T does not require an external output capacitor. Its internal compensation ensures stability with any capacitive load, including zero capacitance - simplifying layout and reducing BOM count in compact designs.
What is the minimum operating current for LM4051AIX3-1.2-T to maintain regulation?
The LM4051AIX3-1.2-T requires a minimum shunt current of 60µA to maintain regulation across its full temperature range (-40°C to +125°C), as specified in the Absolute Maximum Ratings and Electrical Characteristics tables.
Can LM4051AIX3-1.2-T be used in a forward-biased configuration?
Yes - the LM4051AIX3-1.2-T clamps to approximately one diode drop below ground (≈ -0.6V) when forward biased with up to 10mA anode-to-cathode current, enabling limited dual-mode operation in protection or level-shifting circuits.
What package type and dimensions does LM4051AIX3-1.2-T use?
The LM4051AIX3-1.2-T uses the SC70-3 package (package code X3-2), measuring 1.8mm × 1.8mm with 0.65mm pitch, as confirmed in the Selector Guide and Package Information sections of the official datasheet.
LM4051AIX3-1.2-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):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4051AIX3-1.2-T FAQ
1.How can I place an order for LM4051AIX3-1.2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIX3-1.2-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 LM4051AIX3-1.2-T reliable?
The price and inventory of LM4051AIX3-1.2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AIX3-1.2-T is usually 5 days.
3.What payment methods are accepted for LM4051AIX3-1.2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIX3-1.2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIX3-1.2-T?
LM4051AIX3-1.2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIX3-1.2-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 LM4051AIX3-1.2-T?
For technical support, including LM4051AIX3-1.2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIX3-1.2-T requirements.
6.How does Aetrix verify that LM4051AIX3-1.2-T is sourced from the original manufacturer or authorized distributors?
All LM4051AIX3-1.2-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 LM4051AIX3-1.2-T meets industry standards.
7.What is the process for return or replacement of LM4051AIX3-1.2-T?
All LM4051AIX3-1.2-T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIX3-1.2-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 LM4051AIX3-1.2-T part is unused and in its original packaging.
Return procedure for LM4051AIX3-1.2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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