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Texas Instruments LM4051AIM3X-ADJ/NOPB
- Part No.:
- LM4051AIM3X-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AIM3X-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,526
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Product details
Overview
LM4051AIM3X-ADJ/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering adjustable 1.24 V to 10 V output with ±0.1% initial tolerance (A grade), 20 μVrms noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to +125°C. It operates from 60 μA to 12 mA and enables stable regulation in space-constrained battery-powered instrumentation.
For engineers reviewing the LM4051AIM3X-ADJ/NOPB datasheet, LM4051AIM3X-ADJ/NOPB pinout, LM4051AIM3X-ADJ/NOPB application, or LM4051AIM3X-ADJ/NOPB equivalent, key selection criteria include its adjustable output range, no-output-capacitor requirement, low quiescent current, thermal hysteresis of 0.3 mV/V, and compatibility with capacitive loads in portable and industrial sensing systems.
Technical Context
The LM4051AIM3X-ADJ/NOPB functions as a curvature-corrected bandgap shunt reference, using internal amplifier feedback between cathode and reference pins to regulate output voltage via external resistor divider (R1/R2). Its operation requires only a series current-setting resistor (RS) and tolerates any capacitive load without oscillation.
It achieves precision through wafer-level zener-zap and fuse trimming, guaranteeing ±0.1% initial accuracy at 25°C for A-grade units. The device maintains stability over full industrial and extended temperature ranges (−40°C to +125°C) with dynamic output impedance as low as 0.3 Ω at 120 Hz and feedback current of 70–130 nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - set by external R1/R2 ratio; 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 - limits drift to ±5.2 mV over −40°C to +85°C industrial range |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - supports low-noise signal conditioning in precision data acquisition |
| Operating Current | 60 μA to 12 mA - allows ultra-low-power operation while sustaining regulation under varying load |
| Dynamic Output Impedance | 0.3 Ω at 120 Hz - minimizes output voltage perturbation during transient load steps |
| Feedback Current | 70–130 nA - reduces resistor-divider power loss and improves high-impedance node stability |
Pinout & Package
SOT-23-3 package (3.00 mm × 1.30 mm), surface-mount, sub-miniature footprint optimized for PCB area-constrained designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Common return path for feedback network and load; must be connected to system ground |
| Cathode (Pin 1) | Shunt current input / output voltage node | Primary regulation point; connects to RS and load; voltage at this pin equals programmed VOUT |
| Reference (Pin 3) | Feedback input | High-impedance sense node for resistor divider; ties to R1–R2 junction to close regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Eliminates BOM cost and board space for stabilization; stable with any capacitive load up to 10 μF |
| Adjustable output (1.24–10 V) | Enables single-reference reuse across multiple rail voltages via external R1/R2 selection |
| Low 60 μA minimum operating current | Supports >10-year battery life in always-on sensor nodes and IoT endpoints |
| 50 ppm/°C tempco (guaranteed) | Ensures <±10 mV total drift over full −40°C to +125°C range for automotive and industrial use |
| 20 μVrms wideband noise | Preserves ENOB in 16-bit+ SAR ADCs without additional filtering overhead |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with dual-range 16-bit ADC requiring stable 2.5 V and 4.096 V references. IC Role / Device Role / Timing Role: Adjustable shunt reference providing programmable precision bias for ADC reference inputs and analog front-end gain stages. Use Value: Enables single-component solution for dual-rail referencing with <±0.5 LSB error contribution over temperature. | Use Scenario: Industrial PLC analog input module measuring 4–20 mA sensor signals with 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Low-noise, low-drift reference source for ADC reference buffer and DAC output calibration. Use Value: Delivers 20 μVrms noise and 50 ppm/°C drift-meeting Class A metrology requirements without oven control. |
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
Use Scenario: Wearable ECG patch with ultra-low-power microcontroller and 12-bit ADC sampling biopotentials. IC Role / Device Role / Timing Role: Micropower shunt reference supplying regulated 1.8 V for ADC and op-amp biasing in sleep-active cycling mode. Use Value: 60 μA min current and SOT-23 footprint enable >5-year coin-cell operation while maintaining ±0.1% accuracy. | Use Scenario: In-vehicle temperature and pressure sensor interface with CAN bus reporting, operating across −40°C to +125°C. IC Role / Device Role / Timing Role: High-stability shunt reference for sensor signal conditioning and microcontroller VREF in harsh automotive environment. Use Value: Guaranteed 50 ppm/°C tempco and −40°C to +125°C operation ensure <±0.8% total error over full vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431AIDBVR | Fixed 1.24 V output; no adjustable version; 0.5% initial tolerance; higher 100 ppm/°C tempco | Limited to single-voltage systems; less suitable for multi-rail or precision-adjustable designs | Select when cost sensitivity outweighs accuracy and adjustability needs |
| MAX6008AEUR+T | Fixed 1.25 V output; 0.2% initial tolerance; 75 ppm/°C tempco; 1.5 μA typical quiescent current | Optimized for ultra-low-power standby but lacks output flexibility and thermal performance | Prefer for sub-μA sleep-mode applications where 1.25 V suffices and drift budget allows |
Compared with TLV431AIDBVR and MAX6008AEUR+T, the LM4051AIM3X-ADJ/NOPB uniquely combines A-grade ±0.1% accuracy, 1.24–10 V adjustability, 50 ppm/°C tempco, and micropower operation-making it the only option supporting high-precision, multi-voltage, wide-temperature embedded measurement without compromise.
Availability
LM4051AIM3X-ADJ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered medical sensors, and automotive body control modules requiring stable component supply across long production lifecycles.
Supply support for LM4051AIM3X-ADJ/NOPB 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 specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-accuracy measurement systems-including portable test equipment, industrial sensors, and automotive ECUs.
FAQ
What is the minimum operating current for LM4051AIM3X-ADJ/NOPB?
The LM4051AIM3X-ADJ/NOPB requires a minimum operating current of 60 μA across the industrial temperature range (−40°C to +85°C). This value increases slightly to 70 μA in the extended range (−40°C to +125°C). Maintaining current above this threshold ensures the internal amplifier remains biased in its linear region for accurate regulation. Below 60 μA, the LM4051AIM3X-ADJ/NOPB may exhibit increased output impedance and degraded accuracy.
Can LM4051AIM3X-ADJ/NOPB operate without an output capacitor?
Yes, the LM4051AIM3X-ADJ/NOPB is specifically designed to operate stably without any output capacitor-unlike many shunt references that require external capacitance for phase margin. Its advanced internal compensation ensures stability with any capacitive load, including up to 10 μF. This eliminates BOM cost, saves PCB area, and simplifies layout. An output capacitor may still be added for additional noise filtering, but it is never required for stability of the LM4051AIM3X-ADJ/NOPB.
How is the output voltage set for LM4051AIM3X-ADJ/NOPB?
The LM4051AIM3X-ADJ/NOPB output voltage is set using an external resistor divider between cathode (Pin 1) and anode (Pin 2), with the reference pin (Pin 3) connected to the divider's midpoint. The nominal relationship is VOUT = VREF × (1 + R1/R2), where VREF = 1.212 V at 100 μA. For precise results, Equation 4 from the datasheet must be used to correct VREF based on actual VOUT, since ∆VREF/∆VOUT = −1.69 mV/V. This correction ensures accuracy within ±0.1% for the LM4051AIM3X-ADJ/NOPB.
What is the thermal hysteresis specification for LM4051AIM3X-ADJ/NOPB?
The LM4051AIM3X-ADJ/NOPB exhibits a thermal hysteresis of 0.3 mV/V, measured as the voltage shift at +25°C after cycling between −40°C and +125°C. This corresponds to approximately ±0.36 mV for a 1.2 V reference point, and scales linearly with output voltage (e.g., ±0.6 mV at 2.0 V). Thermal hysteresis arises from mechanical stress in the SOT-23 package and is fully characterized in TI's production testing. It is included in the total error budget for high-accuracy LM4051AIM3X-ADJ/NOPB applications.
Does LM4051AIM3X-ADJ/NOPB support capacitive loads?
Yes, the LM4051AIM3X-ADJ/NOPB is explicitly designed to tolerate any capacitive load without instability-ranging from 0 pF to at least 10 μF-as confirmed in TI's datasheet Section 9.2.2 and Figure 10. Unlike conventional shunt references, its internal architecture provides inherent phase margin, eliminating the need for output capacitor isolation resistors or careful layout constraints. This capability simplifies design in systems with large decoupling banks or long traces, and is a guaranteed feature of the LM4051AIM3X-ADJ/NOPB-not a typical or conditional behavior.
LM4051AIM3X-ADJ/NOPB 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:
- Active
- 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/NOPB FAQ
1.How can I place an order for LM4051AIM3X-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIM3X-ADJ/NOPB 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/NOPB reliable?
The price and inventory of LM4051AIM3X-ADJ/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051AIM3X-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIM3X-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIM3X-ADJ/NOPB?
LM4051AIM3X-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIM3X-ADJ/NOPB 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/NOPB?
For technical support, including LM4051AIM3X-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIM3X-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051AIM3X-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051AIM3X-ADJ/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051AIM3X-ADJ/NOPB?
All LM4051AIM3X-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIM3X-ADJ/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM4051AIM3X-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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