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Texas Instruments LM4051AIM3X-ADJ
- Part No.:
- LM4051AIM3X-ADJ
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AIM3X-ADJ.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,095
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Product details
Overview
LM4051AIM3X-ADJ from Texas Instruments is a precision micropower shunt voltage reference in SOT-23 package, delivering an adjustable 1.24 V to 10 V output via external resistor divider, with ±0.1% initial tolerance (A grade), 20 μVrms noise (10 Hz–10 kHz), and 60 μA–12 mA operating current range. It serves as a stable reference in battery-powered data acquisition and portable instrumentation.
For engineers reviewing the LM4051AIM3X-ADJ datasheet, LM4051AIM3X-ADJ pinout, LM4051AIM3X-ADJ application, or LM4051AIM3X-ADJ equivalent, key selection criteria include its adjustable output range, ultra-low quiescent current, capacitive-load stability without external capacitor, and guaranteed 50 ppm/°C tempco over −40°C to +125°C.
Technical Context
The LM4051AIM3X-ADJ operates as a curvature-corrected bandgap shunt reference with internal 1.212 V reference voltage (at 100 μA, VOUT = 5 V). Its feedback architecture uses cathode (pin 1), anode (pin 2), and reference (pin 3) terminals to enable precise output voltage setting via R1/R2 ratio, while maintaining regulation across input voltage and load variations.
It requires no output capacitor for stability and tolerates any capacitive load. The device enters proper linear regulation only when minimum cathode current (60 μA, A grade, industrial range) is met-ensuring sufficient open-loop gain for accurate error amplification in closed-loop configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - set by external R1/R2 divider; enables flexible system-level voltage scaling |
| Initial Tolerance (A Grade) | ±0.1% at 25°C - ensures high-accuracy ADC/DAC biasing without calibration |
| Tempco (Max) | 50 ppm/°C (−40°C to +125°C) - guarantees <±5.2 mV drift over full extended temperature range |
| Operating Current | 60 μA to 12 mA - supports ultra-low-power sensor nodes and high-current clamp circuits |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - suitable for 16-bit+ precision measurement front-ends |
| Dynamic Impedance | 0.3 Ω at 1 mA - provides low-impedance reference node for fast transient load response |
| Feedback Current | 70–130 nA - enables high-resistance divider networks (>10 MΩ) without significant error |
Pinout & Package
SOT-23 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current sink / output node | Primary current path; voltage at this pin is regulated; connects to RS and load |
| Anode (Pin 2) | Reference ground / common return | Typically connected to system ground; forms reference point for cathode voltage |
| Reference (Pin 3) | Feedback input | Connects to R1–R2 junction; senses divided output voltage to maintain VREF = 1.212 V |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts and eliminates capacitor-related aging/failure modes |
| Tolerates capacitive loads | Stable operation with >1 μF bypass or filter caps on cathode-ideal for noisy power rail conditioning |
| Adjustable 1.24–10 V output | Single part replaces multiple fixed references; simplifies BOM and inventory for multi-voltage systems |
| 60 μA minimum operating current | Supports coin-cell and energy-harvesting applications where supply current must stay below 100 μA |
| 50 ppm/°C tempco (guaranteed) | Meets industrial-grade accuracy requirements without external compensation circuitry |
Applications
| Portable Data Loggers | Battery-Powered Medical Sensors |
|---|---|
Use Scenario: Continuous analog sensing of ECG, SpO₂, or glucose levels in handheld diagnostic devices powered by single Li-ion cells. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V or 3.3 V bias for precision SAR ADCs and op-amp signal chains. Use Value: Enables 16-bit effective resolution over −20°C to +60°C ambient with <±1 LSB total error due to reference drift and noise. | Use Scenario: Low-power wearable monitors requiring multi-day operation on button cells. IC Role / Device Role / Timing Role: Adjustable reference setting exact threshold voltages for comparator-based event detection (e.g., motion-triggered wake-up). Use Value: 60 μA min current allows operation down to 2.2 V supply; 20 μVrms noise prevents false triggers in microvolt-level bio-signal thresholds. |
| Industrial Process Transmitters | Automotive Cabin Air Quality Modules |
Use Scenario: 4–20 mA loop-powered field transmitters measuring pressure, temperature, or flow in harsh factory environments. IC Role / Device Role / Timing Role: Precision shunt reference establishing accurate zero/span calibration points for DAC-controlled current output stages. Use Value: Guaranteed 50 ppm/°C tempco ensures <±0.1% span error over −40°C to +85°C, meeting IEC 61000-6-2 immunity requirements. | Use Scenario: Compact CO₂/VOC sensor modules integrated into automotive HVAC control units. IC Role / Device Role / Timing Role: Reference for low-noise amplifier stages feeding NDIR gas detection photodiodes. Use Value: 20 μVrms noise directly translates to <0.5% measurement uncertainty in ppm-level VOC detection under engine-bay thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AIDBZR | Fixed 2.495 V output; higher 1 mA min current; 22 Ω dynamic impedance | Not adjustable; unsuitable for sub-2.4 V or >5 V reference needs | Select when fixed 2.5 V is acceptable and higher current budget exists |
| MAX6126AASA+ | Series reference (not shunt); 1.25 V fixed; 3 ppm/°C max tempco; 1.5 μA quiescent | Requires series pass element; incompatible with shunt topology; lower noise (1.6 μVrms) | Choose for ultra-low-power series-regulated supplies where layout permits extra component |
Compared with TL431AIDBZR and MAX6126AASA+, the LM4051AIM3X-ADJ uniquely combines adjustability, micropower operation, and shunt topology in SOT-23-enabling compact, low-cost, and flexible reference design where input voltage exceeds output and current sinking is preferred.
Availability
LM4051AIM3X-ADJ is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical sensors, and industrial process transmitters requiring stable component supply with long-term parametric consistency.
Supply support for LM4051AIM3X-ADJ 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 leader designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.
The LM4051-N product line delivers precision micropower shunt references optimized for space-constrained, battery-operated, and high-accuracy measurement systems-emphasizing low drift, low noise, and ease of integration.
FAQ
What is the minimum operating current for LM4051AIM3X-ADJ across temperature?
The LM4051AIM3X-ADJ requires a minimum cathode current of 60 μA over the industrial temperature range (−40°C to +85°C) and 70 μA over the extended range (−40°C to +125°C), per TI's LM4051-ADJ Electrical Characteristics table. This ensures sufficient open-loop gain for accurate regulation. Below this threshold, the LM4051AIM3X-ADJ may exit regulation and exhibit increased output voltage error or instability.
Can LM4051AIM3X-ADJ be used without an external capacitor?
Yes, the LM4051AIM3X-ADJ is designed to operate stably without any external capacitor-neither at the cathode nor between pins. Its advanced curvature-corrected bandgap architecture eliminates the need for output stabilization capacitance, reducing bill-of-materials and PCB area. However, a 0.1 μF ceramic capacitor on the input is recommended to suppress supply noise that could couple into the reference output.
How is the output voltage calculated for LM4051AIM3X-ADJ?
The output voltage of LM4051AIM3X-ADJ is determined by the equation VOUT = VREF × (1 + R1/R2), where VREF = 1.212 V (typical at 100 μA, VOUT = 5 V). Because ∆VREF/∆VOUT = −1.69 mV/V, the actual VREF shifts slightly with output voltage; for designs requiring <0.01% accuracy, Equation 4 from the datasheet should be used to correct VREF before calculating VOUT.
What is the function of Pin 3 (Reference) on LM4051AIM3X-ADJ?
Pin 3 (Reference) on LM4051AIM3X-ADJ is the feedback input terminal. It senses the divided output voltage from the R1–R2 resistor network and forces the cathode voltage to regulate such that the voltage at Pin 3 equals the internal 1.212 V reference. This closed-loop action enables precise, adjustable output voltage generation. Pin 3 draws only 70–130 nA, allowing high-value resistors to minimize power loss in battery-sensitive designs.
Does LM4051AIM3X-ADJ support operation above 10 V output?
No, the absolute maximum output voltage specification for LM4051AIM3X-ADJ is 10 V, as stated in Section 6.1 Absolute Maximum Ratings. Attempting to configure the device for >10 V violates its safe operating area and risks permanent damage. The usable output range is strictly 1.24 V to 10 V, limited by internal design constraints and validated electrical characteristics.
LM4051AIM3X-ADJ 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:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- 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-ADJ FAQ
1.How can I place an order for LM4051AIM3X-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIM3X-ADJ 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-ADJ reliable?
The price and inventory of LM4051AIM3X-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AIM3X-ADJ is usually 5 days.
3.What payment methods are accepted for LM4051AIM3X-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIM3X-ADJ transactions.
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4.How is shipping managed for LM4051AIM3X-ADJ?
LM4051AIM3X-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIM3X-ADJ 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-ADJ?
For technical support, including LM4051AIM3X-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIM3X-ADJ requirements.
6.How does Aetrix verify that LM4051AIM3X-ADJ is sourced from the original manufacturer or authorized distributors?
All LM4051AIM3X-ADJ 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-ADJ meets industry standards.
7.What is the process for return or replacement of LM4051AIM3X-ADJ?
All LM4051AIM3X-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIM3X-ADJ, 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-ADJ part is unused and in its original packaging.
Return procedure for LM4051AIM3X-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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