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Texas Instruments LM4051AIM3X-1.2
- Part No.:
- LM4051AIM3X-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AIM3X-1.2.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,304
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Product details
Overview
LM4051AIM3X-1.2 from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a fixed 1.225 V reverse breakdown voltage with ±0.1% initial tolerance (A-grade), 20 μVrms wideband noise (10 Hz–10 kHz), 50 ppm/°C max temperature coefficient, and stable operation from 60 μA to 12 mA supply current. It serves as a low-drift, low-noise voltage reference in battery-powered instrumentation and portable data acquisition systems.
For engineers reviewing the LM4051AIM3X-1.2 datasheet, LM4051AIM3X-1.2 pinout, LM4051AIM3X-1.2 application, or LM4051AIM3X-1.2 equivalent, key selection considerations include its fixed 1.225 V output, A-grade accuracy, SOT-23 thermal performance (RθJA = 214.7 °C/W), no-output-capacitor requirement, and compatibility with capacitive loads in space-constrained analog signal chains.
Technical Context
The LM4051AIM3X-1.2 implements a curvature-corrected bandgap shunt reference architecture, operating as a two-terminal device where cathode regulates voltage by shunting excess current to anode (ground). Its internal fuse and zener-zap trimming ensures ±0.1% initial accuracy at 25°C across the A-grade population.
It functions exclusively in closed-loop mode with internal feedback, requiring only an external series resistor (RS) to set operating current. The device maintains regulation over −40°C to +125°C with guaranteed 50 ppm/°C tempco and exhibits 0.36 mV/V thermal hysteresis after cycling between −40°C and +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage - sets precise bias point for ADCs, DACs, and comparators without external resistors. |
| Initial Tolerance | ±0.1% at 25°C (A-grade) - enables high-accuracy calibration without post-manufacture trimming in portable medical sensors. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - ensures ≤±5.2 mV total drift over industrial range, critical for long-term stability in energy meters. |
| Noise (10 Hz–10 kHz) | 20 μVrms - supports 16-bit+ resolution in low-speed data acquisition without added filtering. |
| Operating Current | 60 μA to 12 mA - allows ultra-low-power sleep modes (<100 μA) while supporting fast wake-up and high-current transient response. |
| Dynamic Impedance | 0.5 Ω at 1 mA, 120 Hz - minimizes load-induced voltage shift in varying-current applications like precision current sources. |
| Long-Term Stability | 120 ppm over 1000 hrs - reduces recalibration frequency in deployed industrial monitoring equipment. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount, JEDEC-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Must be connected to system ground; serves as common return path for shunt current and defines cathode voltage relative to ground. |
| Cathode (Pin 1) | Regulated output terminal | Delivers stable 1.225 V when reverse-biased; connects to RS and load; carries full shunt current (IR = IS − IL). |
| NC / Floating (Pin 3) | Unused terminal | Must be left floating or tied to Pin 2 (anode); not internally connected - avoids parasitic coupling in high-PSRR layouts. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into compact PCB layouts (e.g., wearable biosensors) without stability-compromising bypass components. |
| Tolerates capacitive loads | Supports direct connection to ADC input capacitors or op-amp feedback networks without oscillation risk. |
| 60 μA minimum operating current | Permits operation from coin-cell batteries (e.g., CR2032) for >5 years in always-on sensor nodes with duty-cycled measurement. |
| 20 μVrms low-frequency noise | Preserves SNR in 24-bit delta-sigma ADC front-ends without requiring additional low-noise LDOs or RC filters. |
| 50 ppm/°C tempco over full range | Eliminates need for software temperature compensation in automotive cabin sensors operating from −40°C to +125°C. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) analog front-end conditioning weak electrochemical signals under variable ambient temperature. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 1.225 V bias for transimpedance amplifier and 16-bit SAR ADC reference input. Use Value: ±0.1% initial accuracy and 50 ppm/°C tempco ensure <±1 LSB error across −20°C to +50°C operating range without recalibration. |
Use Scenario: Battery-powered environmental logger recording temperature/humidity every 10 minutes for 10-year field deployment. IC Role / Device Role / Timing Role: Stable reference for microcontroller's internal ADC and external precision thermistor interface circuitry. Use Value: 60 μA min operating current enables >8-year runtime on 2×AA alkaline cells; 120 ppm long-term drift limits recalibration to once per decade. |
| Energy Metering IC Reference | Automotive Cabin Pressure Sensor |
Use Scenario: Class 0.5 smart electricity meter requiring metrology-grade voltage reference for polyphase current sensing. IC Role / Device Role / Timing Role: Primary shunt reference feeding isolated sigma-delta modulator inputs and anti-aliasing filter bias points. Use Value: 20 μVrms noise contributes <0.001% error to 0.5% accuracy class; 0.5 Ω dynamic impedance prevents gain error during rapid current transients. |
Use Scenario: HVAC pressure transducer in vehicle cabin, exposed to thermal cycling from −40°C cold soak to +85°C sunload. IC Role / Device Role / Timing Role: Fixed 1.225 V reference for bridge amplifier and ratiometric ADC conversion in MEMS pressure die interface. Use Value: Guaranteed 50 ppm/°C tempco over −40°C to +125°C eliminates need for external temperature compensation algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance (A-grade), 25 μVrms noise, 100 ppm/°C tempco, SOT-23-3 | Higher noise and tempco; requires ≥100 μA operating current | Select when cost sensitivity outweighs 0.1% accuracy and sub-20 μV noise requirements. |
| ADR3412ARJZ-R7 | 1.2 V output, ±0.1% initial tolerance, 12 μVrms noise, 30 ppm/°C tempco, SOT-23-5 (pin 3 unused) | Lower noise/tempco but larger package; pin 3 must be grounded (not floating) | Select when ultra-low noise dominates layout constraints and board real estate permits SOT-23-5 footprint. |
Compared with REF3012AIDBZR and ADR3412ARJZ-R7, the LM4051AIM3X-1.2 uniquely combines A-grade 0.1% tolerance, 20 μVrms noise, and true SOT-23-3 pinout with floating pin 3-enabling optimal trade-offs among accuracy, noise, thermal stability, and minimal PCB area in high-volume portable designs.
Availability
LM4051AIM3X-1.2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and energy metering systems requiring stable component supply with guaranteed long-term parametric consistency and traceable lot-level calibration data.
Supply support for LM4051AIM3X-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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and broad industrial portfolio coverage.
The LM4051-N product line delivers micropower shunt references optimized for space-constrained, battery-operated applications demanding high initial accuracy, low drift, and robust capacitive-load stability-targeting instrumentation, portable diagnostics, and automotive subsystems.
FAQ
What is the exact output voltage of the LM4051AIM3X-1.2 and how is it trimmed?
The LM4051AIM3X-1.2 delivers a nominal reverse breakdown voltage of 1.225 V at 100 μA test current. This value is achieved via wafer-level fuse and zener-zap trimming, ensuring ±0.1% initial tolerance (A-grade) at 25°C. The specification is production-tested and guaranteed-not typical or average-making LM4051AIM3X-1.2 suitable for zero-calibration systems where absolute voltage accuracy is mandatory.
Can the LM4051AIM3X-1.2 operate without an external series resistor?
No-the LM4051AIM3X-1.2 is a two-terminal shunt reference and requires an external series resistor (RS) between the supply and cathode to establish operating current. Without RS, no regulated current flows and the device cannot maintain 1.225 V output. The resistor must be sized to keep LM4051AIM3X-1.2 current between 60 μA (min) and 12 mA (max) across all load and input voltage conditions.
Is a bypass capacitor required for stable operation of the LM4051AIM3X-1.2?
No bypass capacitor is required for stability-the LM4051AIM3X-1.2 is designed to remain stable with any capacitive load, including direct connection to ADC input capacitors or op-amp feedback networks. However, a 0.1 μF ceramic capacitor at the input is recommended to suppress supply noise that could couple into the reference output and degrade effective resolution.
What is the function of Pin 3 on the LM4051AIM3X-1.2 SOT-23 package?
Pin 3 on the LM4051AIM3X-1.2 is unconnected (NC) and must be left floating or tied to Pin 2 (anode). It is not internally bonded and serves no electrical function. This differs from the LM4051-ADJ variant, where Pin 3 is the feedback (FB) terminal. Misconnecting Pin 3 on LM4051AIM3X-1.2 can introduce leakage paths or parasitic coupling, degrading long-term stability and noise performance.
How does the LM4051AIM3X-1.2 perform over temperature, and what is its guaranteed tempco?
The LM4051AIM3X-1.2 guarantees a maximum temperature coefficient of 50 ppm/°C over the full −40°C to +125°C range. This translates to a worst-case voltage drift of ±5.2 mV over the industrial range (−40°C to +85°C) and ±6.5 mV over the extended range. The spec is ensured via Statistical Quality Control (SQC) correlation-not just 25°C testing-making LM4051AIM3X-1.2 reliable for automotive and outdoor industrial deployments.
LM4051AIM3X-1.2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LM4051AIM3X-1.2 FAQ
1.How can I place an order for LM4051AIM3X-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIM3X-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 LM4051AIM3X-1.2 reliable?
The price and inventory of LM4051AIM3X-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 LM4051AIM3X-1.2 is usually 5 days.
3.What payment methods are accepted for LM4051AIM3X-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIM3X-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIM3X-1.2?
LM4051AIM3X-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIM3X-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 LM4051AIM3X-1.2?
For technical support, including LM4051AIM3X-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIM3X-1.2 requirements.
6.How does Aetrix verify that LM4051AIM3X-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4051AIM3X-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 LM4051AIM3X-1.2 meets industry standards.
7.What is the process for return or replacement of LM4051AIM3X-1.2?
All LM4051AIM3X-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIM3X-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 LM4051AIM3X-1.2 part is unused and in its original packaging.
Return procedure for LM4051AIM3X-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4051AIM3X-1.2 Tags
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TL431AIDBZR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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