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Texas Instruments LM4051BEM3-ADJ/NOPB
- Part No.:
- LM4051BEM3-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BEM3-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,001
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Product details
Overview
LM4051BEM3-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 ±0.2% initial tolerance (B-grade), 50 ppm/°C max temperature coefficient, 20 μVrms noise (10 Hz–10 kHz), and stable operation from 60 μA to 12 mA supply current. It serves as a high-accuracy voltage reference in low-power analog signal chains and battery-powered instrumentation.
For engineers reviewing the LM4051BEM3-ADJ/NOPB datasheet, LM4051BEM3-ADJ/NOPB pinout, LM4051BEM3-ADJ/NOPB application, or LM4051BEM3-ADJ/NOPB equivalent, key selection criteria include its adjustable output range, ultra-low quiescent current, capacitive-load tolerance without external compensation, and guaranteed performance across −40°C to +125°C extended temperature range.
Technical Context
The LM4051BEM3-ADJ/NOPB operates as a curvature-corrected bandgap shunt reference, using internal feedback to regulate cathode voltage via external resistor divider (R1/R2) between cathode and anode. Its reference pin senses a fraction of cathode voltage, enabling precise adjustment while maintaining stability under varying load capacitance.
It functions in closed-loop shunt mode only - no series-pass transistor - drawing current proportional to input excess above regulated output. Minimum operating current is 60 μA over full temperature range; dynamic output impedance is 0.3 Ω at 120 Hz (VOUT = VREF) and rises to 2 Ω at 10 V output, confirming voltage-dependent regulation behavior.
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 without changing reference IC. |
| Initial Tolerance (B-grade) | ±0.2% at 25°C - ensures ≤2.45 mV error at 1.225 V reference point, critical for 12-bit+ ADC/DAC biasing. |
| Tempco (max) | 50 ppm/°C - guarantees ≤±6.25 mV drift over −40°C to +125°C span (ΔT = 165°C), supporting industrial-grade accuracy. |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - low enough for precision sensor front-ends and high-resolution data acquisition systems. |
| Operating Current Range | 60 μA to 12 mA - supports ultra-low-power sleep modes and high-current transient regulation without external buffering. |
| Dynamic Output Impedance | 0.3 Ω at VOUT = VREF; 2 Ω at VOUT = 10 V - confirms predictable AC loading behavior across full output range. |
| Feedback Current | 70–130 nA - enables high-impedance resistor networks (e.g., 1 MΩ/100 kΩ) without significant divider error. |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm, surface-mount, sub-miniature footprint optimized for space-constrained PCBs.
| 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 or low-impedance reference plane. |
| Cathode (Pin 1) | Shunt current input / regulated output | Primary output terminal; sinks current to maintain VCATHODE = VREF × (1 + R1/R2); connects to supply rail via series resistor RS. |
| Reference (Pin 3) | Feedback sense input | High-impedance input sensing voltage divider midpoint; determines regulated cathode voltage; requires direct connection to R1–R2 junction. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load up to 10 μF - eliminates BOM cost and layout area for bypass caps in portable designs. |
| Adjustable output (1.24 V–10 V) | Programmable via two external resistors - replaces multiple fixed references and simplifies voltage-scaling across product variants. |
| Low minimum operating current | 60 μA over −40°C to +125°C - enables operation from coin cells or energy-harvesting sources with microamp-level budgets. |
| Guaranteed tempco | 50 ppm/°C max over full extended temperature range - ensures consistent accuracy in automotive under-hood or industrial control environments. |
| Low wideband noise | 20 μVrms (10 Hz–10 kHz) - preserves SNR in precision measurement circuits without requiring post-regulation filtering. |
Applications
| Battery-Powered Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Portable multimeter or handheld sensor logger powered by single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: Shunt voltage reference for 16-bit SAR ADC and op-amp signal conditioning. Use Value: Enables <1 LSB error over full temperature range and battery discharge cycle due to ±0.2% tolerance and 50 ppm/°C tempco. |
Use Scenario: Industrial PLC analog input module measuring 4–20 mA current loops and thermocouple signals. IC Role / Device Role / Timing Role: Precision reference for programmable gain instrumentation amplifier and sigma-delta ADC driver. Use Value: Delivers 20 μVrms noise floor and stable 1.24–5 V outputs, supporting 100 dB SNR and <0.01% total unadjusted error. |
| Energy Management Systems | Medical Sensor Front-Ends |
Use Scenario: Smart electricity meter with isolated power monitoring and tamper detection circuitry. IC Role / Device Role / Timing Role: Reference for high-side current shunt amplifier and voltage scaling for isolation ADC. Use Value: Maintains accuracy across −40°C to +85°C ambient with 60 μA min current, enabling reliable metrology in outdoor enclosures. |
Use Scenario: Wearable ECG patch with ultra-low-power analog front-end and dry-electrode interface. IC Role / Device Role / Timing Role: Bias reference for low-noise instrumentation amplifier and ADC reference buffer. Use Value: 20 μVrms noise and 50 ppm/°C tempco ensure sub-microvolt baseline stability critical for detecting <10 μV cardiac signals. |
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; 2% initial tolerance; 50 ppm/°C tempco; 1 mA min current; higher noise (40 μVrms) | Not adjustable; requires external resistor network for non-2.5 V outputs; unsuitable for <100 μA systems | Choose when fixed 2.5 V reference suffices and cost sensitivity outweighs precision and current efficiency. |
| MAX6008BAUT12+T | Fixed 1.2 V output; ±0.2% tolerance; 30 ppm/°C tempco; 60 μA min current; 25 μVrms noise; SOT-23-3 | No adjustability; lower output voltage ceiling limits use in >1.2 V scaling applications | Choose when 1.2 V fixed reference meets system needs and tighter tempco (30 ppm/°C) is prioritized over flexibility. |
Compared with TL431CDBZR and MAX6008BAUT12+T, LM4051BEM3-ADJ/NOPB uniquely combines adjustable output (1.24–10 V), B-grade ±0.2% tolerance, and 60 μA min current in SOT-23-3 - making it optimal for multi-voltage, ultra-low-power, and temperature-stable reference designs where flexibility and efficiency are co-prioritized.
Availability
LM4051BEM3-ADJ/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, data acquisition systems, and energy management applications requiring stable component supply, long-term calibration integrity, and extended temperature reliability.
Supply support for LM4051BEM3-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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs for industrial, automotive, and communications markets.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, low-current, high-accuracy applications - designed specifically for portable instrumentation, sensor interfaces, and systems demanding stable reference performance across wide temperature ranges.
FAQ
What is the minimum operating current for LM4051BEM3-ADJ/NOPB over temperature?
The LM4051BEM3-ADJ/NOPB has a guaranteed minimum operating current of 60 μA across the full extended temperature range of −40°C to +125°C. This value is specified in the LM4051-ADJ Electrical Characteristics table for B-grade devices and ensures proper regulation and open-loop gain for accurate feedback operation under worst-case thermal conditions.
Can LM4051BEM3-ADJ/NOPB be used without external capacitors?
Yes, LM4051BEM3-ADJ/NOPB is designed for unconditional stability without output capacitors and tolerates any capacitive load up to at least 10 μF. Its internal architecture eliminates the need for external compensation, reducing BOM count and PCB area - a key advantage in space-constrained portable and wearable applications.
What is the maximum output voltage achievable with LM4051BEM3-ADJ/NOPB?
The LM4051BEM3-ADJ/NOPB supports an output voltage range of 1.24 V to 10 V, as confirmed in the Recommended Operating Conditions table. This upper limit is constrained by internal device ratings and ensures safe operation of the feedback amplifier and reference core under all specified conditions.
How does the feedback current specification affect resistor selection for LM4051BEM3-ADJ/NOPB?
The LM4051BEM3-ADJ/NOPB has a feedback current (IFB) of 70–130 nA, meaning the resistor network (R1/R2) connected to the REF pin draws negligible current. This allows use of high-value resistors (e.g., 1 MΩ/100 kΩ) without introducing significant divider error, preserving accuracy while minimizing power consumption in battery-operated systems.
Is LM4051BEM3-ADJ/NOPB suitable for automotive under-hood applications?
Yes, LM4051BEM3-ADJ/NOPB is qualified for extended temperature operation up to +125°C and features a guaranteed 50 ppm/°C temperature coefficient across −40°C to +125°C. Its SOT-23-3 package and robust shunt architecture make it suitable for automotive body control modules, battery management sensors, and other under-hood applications requiring precision voltage referencing.
LM4051BEM3-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:
- 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:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051BEM3-ADJ/NOPB FAQ
1.How can I place an order for LM4051BEM3-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BEM3-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 LM4051BEM3-ADJ/NOPB reliable?
The price and inventory of LM4051BEM3-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 LM4051BEM3-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051BEM3-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BEM3-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BEM3-ADJ/NOPB?
LM4051BEM3-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BEM3-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 LM4051BEM3-ADJ/NOPB?
For technical support, including LM4051BEM3-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BEM3-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051BEM3-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051BEM3-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 LM4051BEM3-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051BEM3-ADJ/NOPB?
All LM4051BEM3-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BEM3-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 LM4051BEM3-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051BEM3-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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