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Analog Devices Inc./Maxim Integrated LM4051AIX3-1.2+
- Part No.:
- LM4051AIX3-1.2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4051AIX3-1.2+.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
LM4051AIX3-1.2+ from Maxim Integrated is a precision 1.225V shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±15ppm/°C temperature coefficient (max), and 60µA to 15mA operating current range. It delivers stable reverse breakdown voltage for ADC/DAC biasing, portable power monitoring, and battery management systems where space and low quiescent current are critical.
For engineers reviewing the LM4051AIX3-1.2+ datasheet, LM4051AIX3-1.2+ pinout, LM4051AIX3-1.2+ application, or LM4051AIX3-1.2+ equivalent, this page provides verified electrical specifications, SC70-3 terminal mapping, thermal performance across –40°C to +125°C, and validated alternatives for precision analog reference design.
Technical Context
The LM4051AIX3-1.2+ uses a laser-trimmed bandgap core to maintain 1.225V reverse breakdown with <±15ppm/°C drift over full industrial temperature range. Its two-terminal shunt architecture requires no external capacitor and tolerates arbitrary capacitive loads while maintaining stability.
It operates as a precision current-sink reference: reverse current (cathode-to-anode) between 60µA and 15mA sets regulation point; forward conduction clamps at ~0.7V below ground up to 10mA. Dynamic impedance remains ≤1.5Ω at 1mA, enabling fast load-transient response in high-PSRR analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal; guaranteed 1.2238V–1.2262V at +25°C (A-grade) |
| Initial Accuracy | ±0.1% (±1.2mV) at +25°C - enables 12-bit ADC reference without calibration |
| Tempco | ±15ppm/°C max - ensures ≤±0.015% output drift over –40°C to +125°C |
| Operating Current | 60µA to 15mA - supports micropower sensor nodes and higher-current DAC references |
| Dynamic Impedance | ≤1.5Ω at 1mA - minimizes output voltage shift under dynamic load changes |
| Output Noise | 20µVRMS (10Hz–10kHz) - suitable for high-resolution data acquisition systems |
| Long-Term Stability | 120ppm after 1000h - predictable aging behavior for mission-critical instrumentation |
Pinout & Package
LM4051AIX3-1.2+ is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23-3. Pin 3 is NC and must be left floating or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Cathode | Reverse-biased terminal; connects to regulated voltage node (e.g., ADC REF+) |
| Pin 2 (−) | Anode | Reference ground return; forms shunt current path with external series resistor |
| Pin 3 (N.C.) | No Connection | Must remain unconnected or shorted to Pin 2; no internal circuitry attached |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 footprint | 1.8mm × 1.8mm area saves PCB space in portable and wearable electronics |
| No output capacitor required | Eliminates BOM cost and layout complexity while ensuring stability with any capacitive load |
| Wide shunt current range | 60µA minimum enables operation in energy-harvesting and coin-cell applications |
| Low wideband noise | 20µVRMS (10Hz–10kHz) preserves SNR in precision measurement front-ends |
| Laser-trimmed accuracy | 0.1% initial tolerance reduces system calibration overhead in production test |
Applications
| Portable Medical Sensors | Battery Fuel Gauging |
|---|---|
Use Scenario: Reference for 16-bit sigma-delta ADC measuring ECG electrode potentials in patch-style monitors. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225V reference for analog front-end gain and offset calibration. Use Value: ±15ppm/°C tempco ensures <±0.02% reference error across body-worn temperature range (10°C–45°C), preserving diagnostic accuracy. | Use Scenario: Reference for coulomb counter IC in lithium-ion battery packs for IoT edge devices. IC Role / Device Role / Timing Role: Precision shunt reference setting ADC full-scale for current-sense amplifier output. Use Value: 60µA minimum operating current allows continuous operation during deep sleep modes, extending battery life beyond 5 years. |
| Industrial Data Loggers | Smart Meter Analog Front-End |
Use Scenario: Reference for multi-channel 24-bit delta-sigma ADC sampling temperature, pressure, and humidity sensors. IC Role / Device Role / Timing Role: Primary voltage reference sourcing stable 1.225V to multiple precision op-amp stages and ADC reference input. Use Value: 120ppm long-term stability ensures <±0.012% reference drift over 10-year field deployment, reducing recalibration frequency. | Use Scenario: Reference for metrology-grade ADC in Class 0.2 smart electricity meters. IC Role / Device Role / Timing Role: High-stability shunt reference supplying 1.225V to isolation amplifier feedback and ADC reference rails. Use Value: ≤1.5Ω dynamic impedance maintains <10µV output shift during transient line surges, meeting IEC 62053-22 accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBVR | Adjustable 1.24V reference; requires two external resistors; 2% initial accuracy (typical); 90ppm/°C tempco | Used where programmable output or higher voltage (up to 18V) is needed; less precise for fixed 1.225V use cases | Select TLVH431AIDBVR only when adjustable output or higher voltage capability is required; not drop-in for 1.225V fixed reference |
| ADR3412ARJZ-R7 | 1.200V output; 0.1% initial accuracy; 30ppm/°C tempco; 3-pin SOT23 package; 100µA min operating current | Suitable for 1.2V systems but lacks 1.225V match; larger tempco increases error at temperature extremes | Choose ADR3412ARJZ-R7 only if 1.200V output suffices and SOT23-3 footprint is preferred; verify 30ppm/°C drift meets system spec |
Compared with TLVH431AIDBVR and ADR3412ARJZ-R7, LM4051AIX3-1.2+ offers exact 1.225V output, superior ±15ppm/°C tempco, and lower 60µA minimum current-making it optimal for fixed-precision, low-power, space-constrained analog reference designs.
Availability
LM4051AIX3-1.2+ is available at Aetrix Electronics and suitable for portable medical sensors, battery fuel gauging, and industrial data loggers requiring stable component supply with RoHS-compliant packaging and full temperature-range validation.
Supply support for LM4051AIX3-1.2+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
LM4051AIX3-1.2+ belongs to the LM4050/LM4051 family of micropower shunt references engineered for space-constrained, high-accuracy voltage referencing in battery-powered and harsh-environment systems.
FAQ
What is the guaranteed output voltage tolerance of LM4051AIX3-1.2+ over its full operating temperature range?
The LM4051AIX3-1.2+ guarantees ±0.6% total output voltage tolerance over –40°C to +125°C, combining its ±0.1% initial accuracy and ±50ppm/°C maximum temperature coefficient. This is calculated as ±0.1% ± (50ppm/°C × 100°C) = ±0.6%, confirmed in the datasheet Note 2 for A-grade devices.
Can LM4051AIX3-1.2+ operate stably without an external output capacitor?
Yes, LM4051AIX3-1.2+ is internally compensated and requires no external output capacitor for stability. It remains stable with any capacitive load, including large bulk decoupling caps used in power-sensitive applications-eliminating risk of oscillation and simplifying layout.
What is the minimum shunt current required for LM4051AIX3-1.2+ to maintain regulation?
The LM4051AIX3-1.2+ 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 worst-case VS(MIN) and ILOAD(MAX).
How does the pin configuration of LM4051AIX3-1.2+ differ from standard three-terminal references?
LM4051AIX3-1.2+ uses a two-terminal shunt topology with three physical pins: Pin 1 (+) is cathode, Pin 2 (−) is anode, and Pin 3 is NC (no connection). Unlike series references, it sinks current rather than sourcing it-and Pin 3 must be left floating or tied to Pin 2 per datasheet directive.
Is LM4051AIX3-1.2+ compatible with lead-free reflow processes?
Yes, LM4051AIX3-1.2+ carries the '+' suffix indicating RoHS-compliant, lead-free construction. It is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020, with peak temperature rating up to +260°C and MSL level 1 handling.
LM4051AIX3-1.2+ 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+ FAQ
1.How can I place an order for LM4051AIX3-1.2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIX3-1.2+ 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+ reliable?
The price and inventory of LM4051AIX3-1.2+ 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+ is usually 5 days.
3.What payment methods are accepted for LM4051AIX3-1.2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIX3-1.2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIX3-1.2+?
LM4051AIX3-1.2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIX3-1.2+ 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+?
For technical support, including LM4051AIX3-1.2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIX3-1.2+ requirements.
6.How does Aetrix verify that LM4051AIX3-1.2+ is sourced from the original manufacturer or authorized distributors?
All LM4051AIX3-1.2+ 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+ meets industry standards.
7.What is the process for return or replacement of LM4051AIX3-1.2+?
All LM4051AIX3-1.2+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIX3-1.2+, 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+ part is unused and in its original packaging.
Return procedure for LM4051AIX3-1.2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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