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Texas Instruments LM4051BIM3X-ADJ
- Part No.:
- LM4051BIM3X-ADJ
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3X-ADJ.pdf
- Description:
- IC VREF SHUNT ADJ 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,402
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Product details
Overview
LM4051BIM3X-ADJ from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering an adjustable reverse breakdown voltage (1.24 V to 10 V), ±0.1% initial accuracy (A-grade), 20 μVrms wideband noise (10 Hz–10 kHz), 60 μA minimum operating current, and 50 ppm/°C max temperature coefficient over −40°C to +125°C. It serves as a stable reference in battery-powered data acquisition systems requiring low quiescent current and high DC accuracy.
For engineers reviewing the LM4051BIM3X-ADJ datasheet, LM4051BIM3X-ADJ pinout, LM4051BIM3X-ADJ application, or LM4051BIM3X-ADJ equivalent, key selection criteria include output voltage adjustability range, thermal hysteresis (0.3 mV/V), dynamic output impedance (0.3 Ω at VOUT = VREF), feedback current (70–130 nA), and compatibility with capacitive loads without external stabilization.
Technical Context
The LM4051BIM3X-ADJ operates 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 design eliminates need for output capacitor while maintaining stability across all capacitive loads.
It functions in closed-loop mode only: cathode voltage is set by VOUT = VREF × (1 + R1/R2), where VREF = 1.212 V (typ) at IR = 100 μA and VOUT = 5 V, with ∆VREF/∆VOUT = −1.69 mV/V (typ) and ∆VREF/∆IR ≤ 0.3 mV (for IR ≤ 1 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external resistive divider; enables flexible system-level voltage scaling |
| Initial Accuracy (A-grade) | ±0.1% at 25°C - ensures high-precision ADC/DAC biasing without calibration |
| Tempco (max) | 50 ppm/°C over −40°C to +125°C - supports stable operation in automotive and industrial environments |
| Wideband Noise | 20 μVrms, 10 Hz–10 kHz - minimizes contribution to signal chain noise floor in precision instrumentation |
| Min Operating Current | 60 μA - enables ultra-low-power operation in coin-cell or energy-harvesting applications |
| Dynamic Output Impedance | 0.3 Ω at VOUT = VREF - provides low-impedance reference node for fast transient load response |
| Feedback Current | 70–130 nA - allows use of high-value resistors (e.g., 1 MΩ) without significant divider error |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground connection | Common return path for feedback network and load; must be tied to system ground |
| Cathode (Pin 1) | Shunt current input / regulated output | Primary output node; sinks current to maintain programmed VOUT; connects to supply via series resistor RS |
| Reference (Pin 3) | Feedback sense input | High-impedance input monitoring voltage divider midpoint; sets regulation point via resistor ratio |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts and eliminates capacitor aging/reliability concerns |
| Tolerates capacitive loads | Stable with any output capacitance (e.g., ADC input caps, filtering caps), simplifying layout |
| Adjustable reverse breakdown | Supports custom reference voltages from 1.24 V to 10 V using two external resistors |
| Low thermal hysteresis | 0.3 mV/V - reduces post-thermal-cycling drift in precision measurement systems |
| Curvature-corrected bandgap core | Delivers flat temperature response without external compensation components |
Applications
| Portable Data Acquisition | Industrial Process Control |
|---|---|
Use Scenario: Battery-powered handheld multimeter sampling analog sensor signals at 16-bit resolution. IC Role / Device Role / Timing Role: Provides stable, low-noise reference for successive-approximation ADC conversion. Use Value: Enables ±0.1% full-scale accuracy over −20°C to +70°C ambient without recalibration. | Use Scenario: 4–20 mA transmitter module converting RTD temperature readings to current loop output. IC Role / Device Role / Timing Role: Supplies precise excitation voltage for Wheatstone bridge and reference for DAC-controlled current sink. Use Value: Maintains <±0.05% gain error across −40°C to +85°C due to 50 ppm/°C tempco and low long-term drift (120 ppm/1000 hrs). |
| Precision Energy Monitoring | Medical Sensor Interface |
Use Scenario: Smart electricity meter measuring line voltage/current with isolation and metrology-grade accuracy. IC Role / Device Role / Timing Role: Reference for isolated sigma-delta ADC and calibration point for gain/offset correction algorithms. Use Value: Delivers 20 μVrms noise floor and <1.1 mV output shift over full industrial temperature range. | Use Scenario: Portable ECG front-end amplifying microvolt-level biopotentials with high CMRR. IC Role / Device Role / Timing Role: Bias voltage source for op-amp rail-splitting and reference for analog front-end PGA gain setting. Use Value: Ensures <±0.02% offset drift over patient temperature variations (25°C–42°C) and long-term clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | Fixed 2.495 V output; higher min current (1 mA); 2% initial tolerance; no adjustable option | Limited to fixed-voltage designs; unsuitable for sub-2.4 V or >5 V references | Select when cost sensitivity outweighs precision and adjustability needs |
| MAX6126AASA+T | Series reference (not shunt); 1.25 V fixed; 0.04% initial accuracy; 3 ppm/°C tempco; requires input capacitor | Higher accuracy but incompatible topology-requires redesign of biasing and current sourcing | Choose only if system architecture permits series configuration and demands ultra-low tempco |
Compared with TL431CDBZR and MAX6126AASA+T, the LM4051BIM3X-ADJ uniquely combines adjustability, micropower operation (60 μA), and shunt topology in a 3-pin SOT-23-enabling compact, low-cost, and flexible reference design without layout or topology changes.
Availability
LM4051BIM3X-ADJ is available at Aetrix Electronics and suitable for portable instrumentation, industrial process control, and precision energy monitoring requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM4051BIM3X-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LM4051-N product line delivers micropower shunt voltage 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 maximum output voltage supported by the LM4051BIM3X-ADJ?
The LM4051BIM3X-ADJ supports an adjustable output voltage range from 1.24 V to 10 V, determined by the external resistor divider (R1/R2) and the internal reference voltage (VREF). This upper limit is specified in the Absolute Maximum Ratings table and confirmed in Section 6.3 Recommended Operating Conditions. Exceeding 10 V risks violating safe operating area limits and may degrade long-term stability.
Does the LM4051BIM3X-ADJ require an external output capacitor for stability?
No, the LM4051BIM3X-ADJ does not require an external output capacitor for stability. Its advanced curvature-corrected bandgap design ensures unconditional stability with any capacitive load, including large ceramic or tantalum capacitors used for filtering or decoupling. This eliminates capacitor-related aging, leakage, and board space concerns-confirmed in the Features section and Detailed Description (Section 8.3).
How is the feedback current (IFB) of the LM4051BIM3X-ADJ defined, and why does it matter?
The feedback current (IFB) of the LM4051BIM3X-ADJ is the input bias current into the Reference (Pin 3) terminal, specified as 70–130 nA. It directly impacts resistor divider accuracy: for example, using 1 MΩ resistors introduces ~0.13 mV error. Selecting higher resistor values increases this error, so designers must balance power savings against voltage-setting precision when choosing R1/R2 for the LM4051BIM3X-ADJ.
What is the minimum operating current for the LM4051BIM3X-ADJ across temperature ranges?
The LM4051BIM3X-ADJ has a minimum operating 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 Section 6.6 Electrical Characteristics. This value applies specifically to the A-grade device and ensures proper biasing of the internal amplifier and reference core to maintain regulation and specified accuracy.
Can the LM4051BIM3X-ADJ be used in a series regulator configuration?
No, the LM4051BIM3X-ADJ is a shunt voltage reference and cannot function as a series regulator. It regulates by sinking variable current from the cathode to ground, requiring an external series resistor (RS) between supply and cathode. Attempting series operation violates its functional topology and will result in loss of regulation. For series references, consider alternatives like the MAX6126AASA+T-but note that such substitution requires full circuit redesign.
LM4051BIM3X-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:
- ±0.2%
- 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
LM4051BIM3X-ADJ FAQ
1.How can I place an order for LM4051BIM3X-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3X-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 LM4051BIM3X-ADJ reliable?
The price and inventory of LM4051BIM3X-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BIM3X-ADJ is usually 5 days.
3.What payment methods are accepted for LM4051BIM3X-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3X-ADJ transactions.
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4.How is shipping managed for LM4051BIM3X-ADJ?
LM4051BIM3X-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3X-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 LM4051BIM3X-ADJ?
For technical support, including LM4051BIM3X-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3X-ADJ requirements.
6.How does Aetrix verify that LM4051BIM3X-ADJ is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3X-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 LM4051BIM3X-ADJ meets industry standards.
7.What is the process for return or replacement of LM4051BIM3X-ADJ?
All LM4051BIM3X-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3X-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 LM4051BIM3X-ADJ part is unused and in its original packaging.
Return procedure for LM4051BIM3X-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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