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Analog Devices Inc./Maxim Integrated LM4051AIM3-1.2+
- Part No.:
- LM4051AIM3-1.2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AIM3-1.2+.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:2,471
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Product details
Overview
LM4051AIM3-1.2+ from Maxim Integrated is a precision 1.225V shunt voltage reference in SC70-3 package, featuring 0.1% initial accuracy, ±15ppm/°C temperature coefficient (typ), 60µA to 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 LM4051AIM3-1.2+ datasheet, LM4051AIM3-1.2+ pinout, LM4051AIM3-1.2+ application, or LM4051AIM3-1.2+ equivalent, key selection criteria include guaranteed -40°C to +125°C operation, no external capacitor requirement, tolerance of capacitive loads, and compatibility with space-constrained portable designs requiring micropower stability.
Technical Context
The LM4051AIM3-1.2+ implements a laser-trimmed bandgap core in BiCMOS process to deliver fixed 1.225V reverse breakdown voltage with minimal drift. Its two-terminal shunt architecture sinks current through an external series resistor to regulate voltage across load, eliminating need for supply rail sequencing or active drive circuitry.
It operates stably without output capacitance and maintains regulation under capacitive loading up to ≥1µF. The device's dynamic impedance is ≤1.5Ω at 1mA (120Hz), enabling fast transient response in precision sensor front-ends and data acquisition systems where reference settling time impacts measurement fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V ±1.2mV (A-grade, +25°C); enables accurate 1.2V system biasing and ADC reference scaling |
| Initial Accuracy | ±0.1% (max) at +25°C; reduces calibration overhead in factory-trimmed instrumentation |
| Tempco | ±15ppm/°C (typ), ≤50ppm/°C (max); ensures ≤0.6% total drift over -40°C to +125°C |
| Operating Current | 60µA to 15mA; supports ultra-low-power sleep modes and high-current precision DAC references |
| Output Noise | 28µVRMS (10Hz–10kHz); preserves SNR in 16-bit+ data converters without filtering |
| Dynamic Impedance | ≤1.5Ω at 1mA/120Hz; minimizes load-induced voltage shift during fast digital switching |
| Long-Term Stability | 120ppm (1000h); ensures reference integrity in unattended industrial monitoring nodes |
Pinout & Package
LM4051AIM3-1.2+ uses the 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is NC (no connection) and must be left floating or tied to pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode / Positive Terminal | Connects to regulated output node; carries full shunt + load current |
| 2 (−) | Cathode / Negative Terminal | Reference ground return path; must be low-impedance for accuracy |
| 3 (N.C.) | No Connection | Must remain unconnected or shorted to pin 2; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23, critical for wearables and hearing aids |
| No output capacitor required | Eliminates BOM cost and layout risk associated with capacitor selection, aging, and ESR variation |
| Tolerates capacitive loads | Stable with ≥1µF ceramic or tantalum output capacitance, simplifying EMI filtering and power rail decoupling |
| Wide shunt current range | 60µA minimum enables nanoamp-level standby operation; 15mA max supports high-speed ADC reference buffering |
| Laser-trimmed accuracy | 0.1% initial tolerance achieved via on-die trimming, avoiding post-package calibration labor |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) analog front-end requiring stable 1.2V reference for transimpedance amplifier biasing and ADC reference. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise, low-noise DC bias point independent of battery voltage decay. Use Value: Enables <1% full-scale error over 10-year shelf life and -20°C to +50°C operating range without recalibration. | Use Scenario: Battery-powered environmental sensor node logging temperature/humidity with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Primary reference for ADC and analog sensor signal conditioning, operating continuously at 100µA quiescent current. Use Value: Delivers 28µVRMS noise floor and ±15ppm/°C tempco-meeting EN 61000-4-3 immunity requirements for field-deployed units. |
| Wearable Audio Devices | Automotive Cabin Sensors |
Use Scenario: True wireless stereo (TWS) earbud with integrated biometric sensing and low-latency audio codec. IC Role / Device Role / Timing Role: Reference source for microphone preamp gain control and MEMS accelerometer biasing. Use Value: SC70-3 size fits sub-10mm² PCB real estate; 60µA min current extends battery life beyond 12 hours per charge. | Use Scenario: Occupant detection module using capacitive touch and IR proximity sensors in automotive cabin. IC Role / Device Role / Timing Role: Stable 1.225V reference for ratiometric sensor excitation and ADC conversion in ASIL-B compliant subsystem. Use Value: Guaranteed operation from -40°C to +125°C meets AEC-Q100 Grade 1 thermal requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | Adjustable (2.5V min), 0.5% initial accuracy, higher 90ppm/°C tempco, SOT23-3 | Requires external resistors for 1.225V setting; less stable over temperature | Choose only if adjustable output is needed and 1.225V accuracy is secondary |
| REF3012AIDBZR | 1.2V output, 0.2% initial accuracy, 50ppm/°C tempco, 50µA min current, SOT23-3 | Slightly lower voltage (1.200V vs. 1.225V); tighter 0.2% grade but wider tempco than LM4051A | Acceptable where 25mV offset is tolerable and lower quiescent current is prioritized |
Compared with TLVH431AIDBZR and REF3012AIDBZR, LM4051AIM3-1.2+ delivers superior 0.1% initial accuracy and ±15ppm/°C typical tempco in the smallest SC70 footprint-making it optimal for high-precision, space-constrained applications where fixed 1.225V is required and microamp-level stability matters.
Availability
LM4051AIM3-1.2+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, wearable audio devices, and automotive cabin sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4051AIM3-1.2+ 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, medical, and communications applications.
The LM4050/LM4051 family was engineered to replace larger, less accurate zener-based references in space- and power-constrained systems-delivering 0.1% accuracy and SC70 packaging without sacrificing temperature stability or noise performance.
FAQ
What is the exact output voltage tolerance of LM4051AIM3-1.2+ at +25°C?
The LM4051AIM3-1.2+ has a reverse breakdown voltage of 1.225V with ±1.2mV (±0.1%) initial tolerance at +25°C, as specified for the 'A' grade in the Electrical Characteristics table. This corresponds to a guaranteed range of 1.2238V to 1.2262V under nominal test conditions (IR = 100µA).
Does LM4051AIM3-1.2+ require an external capacitor for stability?
No, LM4051AIM3-1.2+ does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load-including 0µF-and remains stable up to ≥1µF, simplifying layout and reducing BOM count in compact designs.
What is the minimum operating current for LM4051AIM3-1.2+?
The minimum operating current for LM4051AIM3-1.2+ is 60µA, verified across the full -40°C to +125°C temperature range. Operation below this current may result in loss of regulation and increased output voltage drift, so design must ensure ISHUNT ≥60µA under all conditions.
Can LM4051AIM3-1.2+ be used in automotive applications?
Yes, LM4051AIM3-1.2+ is qualified for operation from -40°C to +125°C and is commonly deployed in automotive cabin sensors and infotainment subsystems. While not AEC-Q200 certified as a standalone component, its guaranteed specs and robustness make it suitable for non-safety-critical automotive functions when validated in system-level testing.
What is the pin 3 function on LM4051AIM3-1.2+?
Pin 3 on LM4051AIM3-1.2+ is labeled N.C. (No Connection) and must be left floating or connected to pin 2 (cathode). It is not internally bonded and serves no electrical function-connecting it elsewhere may compromise performance or reliability.
LM4051AIM3-1.2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 12 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051AIM3-1.2+ FAQ
1.How can I place an order for LM4051AIM3-1.2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIM3-1.2+ 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 LM4051AIM3-1.2+ reliable?
The price and inventory of LM4051AIM3-1.2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AIM3-1.2+ is usually 5 days.
3.What payment methods are accepted for LM4051AIM3-1.2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIM3-1.2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIM3-1.2+?
LM4051AIM3-1.2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIM3-1.2+ 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 LM4051AIM3-1.2+?
For technical support, including LM4051AIM3-1.2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIM3-1.2+ requirements.
6.How does Aetrix verify that LM4051AIM3-1.2+ is sourced from the original manufacturer or authorized distributors?
All LM4051AIM3-1.2+ 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 LM4051AIM3-1.2+ meets industry standards.
7.What is the process for return or replacement of LM4051AIM3-1.2+?
All LM4051AIM3-1.2+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIM3-1.2+, 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 LM4051AIM3-1.2+ part is unused and in its original packaging.
Return procedure for LM4051AIM3-1.2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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