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Texas Instruments LM4051BEM3X-1.2/NOPB
- Part No.:
- LM4051BEM3X-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BEM3X-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,535
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Product details
Overview
LM4051BEM3X-1.2/NOPB 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 ±0.2% 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 enables high-accuracy voltage regulation in space-constrained battery-powered instrumentation.
For engineers reviewing the LM4051BEM3X-1.2/NOPB datasheet, LM4051BEM3X-1.2/NOPB pinout, LM4051BEM3X-1.2/NOPB application, or LM4051BEM3X-1.2/NOPB equivalent, this page delivers verified circuit role, thermal stability data, load-capacitance immunity, grade-specific tolerances, and direct substitution guidance for industrial and portable systems requiring sub-1% voltage reference accuracy over −40°C to +125°C.
Technical Context
The LM4051BEM3X-1.2/NOPB operates as a curvature-corrected bandgap shunt reference, using internal zener-zap trimming to achieve ±0.2% initial accuracy at 25°C. Its design eliminates need for output stabilization capacitors while maintaining stability with any capacitive load - a key differentiator versus legacy shunt references.
It functions exclusively in closed-loop mode with internal feedback, regulating cathode-to-anode voltage by dynamically shunting excess current to ground. The B-grade variant guarantees 50 ppm/°C tempco across −40°C to +125°C and supports operation down to 60 μA minimum cathode current, enabling ultra-low-power sensor biasing and ADC reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage - sets precise threshold for clamping, level detection, and ADC reference without external resistors. |
| Initial Tolerance | ±0.2% at 25°C (B-grade) - ensures ≤2.45 mV absolute error at room temperature, critical for 12-bit+ measurement systems. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - contributes ≤6.5 mV drift over full extended range, enabling stable operation in automotive under-hood environments. |
| Noise (10 Hz–10 kHz) | 20 μVrms - low enough to avoid degrading SNR in 16-bit SAR ADCs or precision analog front-ends. |
| Operating Current Range | 60 μA to 12 mA - supports micropower sensor nodes (e.g., 3.3 V battery with 100 kΩ series resistor) and higher-current clamp circuits. |
| Thermal Hysteresis | 0.36 mV/V - quantifies reversible voltage shift after thermal cycling; impacts repeatability in field-deployed calibration equipment. |
| Dynamic Impedance | 0.5 Ω at 1 mA / 120 Hz - ensures minimal load-regulation error (<0.6 mV at 1.2 mA load step), vital for dynamic reference buffering. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount compatible with standard reflow profiles. Pin 3 must be left floating or connected to Pin 2 per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Common return path for cathode current; must be tied to system ground or low-impedance reference plane. |
| Cathode (Pin 1) | Voltage output terminal | Delivers regulated 1.225 V relative to anode; sinks all operating current and load current - trace width must support ≥12 mA. |
| NC / FB (Pin 3) | No-connect / feedback tie point | Must float or connect to Pin 2 (anode); not used in LM4051-1.2 variants - incorrect connection causes regulation failure. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables single-component reference design in PCB area-constrained modules (e.g., wearables), eliminating BOM cost and layout risk of capacitor ESR/aging effects. |
| Tolerates capacitive loads | Stable with >100 nF output capacitance - allows direct coupling to ADC input caps or op-amp buffers without phase-margin compensation. |
| 60 μA minimum operating current | Supports 3.3 V supply with 56 kΩ series resistor (I = (3.3 V − 1.225 V)/56 kΩ ≈ 37 μA → insufficient; 33 kΩ yields 63 μA), enabling true micropower wake-up circuits. |
| Reverse breakdown voltage option | Fixed 1.225 V output eliminates resistor-divider errors and thermal tracking mismatch inherent in adjustable references - improves long-term system accuracy. |
| 50 ppm/°C tempco (−40°C to +125°C) | Guaranteed drift performance enables use in extended-temperature industrial PLC I/O modules without derating or calibration lookup tables. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter reference rail supplying dual-slope integrator and LCD bias. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 1.225 V基准 for auto-zeroing and ADC conversion. Use Value: ±0.2% initial tolerance and 50 ppm/°C tempco ensure <0.01% full-scale error over operating temperature, meeting Class II meter accuracy standards. |
Use Scenario: 16-bit SAR ADC reference in environmental sensor node logging temperature/humidity/pressure. IC Role / Device Role / Timing Role: Low-noise (20 μVrms) voltage reference for ADC VREF input, directly coupled without buffer. Use Value: 20 μVrms noise contributes <0.3 LSB error in 16-bit 2.5 V full-scale system, preserving effective resolution without oversampling. |
| Automotive Battery Monitoring | Precision Current Sensing |
Use Scenario: Cell voltage monitor in 12 V lead-acid battery management for start-stop systems. IC Role / Device Role / Timing Role: Stable 1.225 V reference for comparator-based overvoltage/undervoltage detection thresholds. Use Value: 60 μA min operating current allows direct connection to battery via high-value resistor (e.g., 150 kΩ), minimizing standby drain below 2 μA. |
Use Scenario: Floating current source for RTD excitation in industrial process transmitters. IC Role / Device Role / Timing Role: Precision shunt reference setting current through sense resistor in Howland current source topology. Use Value: 0.5 Ω dynamic impedance ensures <0.6 mV compliance error at 1.2 mA, enabling <0.05% current accuracy independent of load variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 2.5 V fixed output, ±2% initial tolerance, 92 ppm/°C tempco, requires 1 mA min cathode current. | Higher voltage, lower accuracy, higher power - suitable only where 2.5 V is acceptable and board space allows larger resistor network for scaling. | Select TL431CDBVR only if system already uses 2.5 V references and can tolerate ≥10× higher initial error and reduced thermal stability. |
| MAX6008BEUR+T | 1.25 V output, ±0.2% initial tolerance, 75 ppm/°C tempco, 35 μA min operating current, SC70-3 package. | Lower min current enables deeper sleep modes, but higher tempco increases drift in wide-temperature deployments. | Choose MAX6008BEUR+T when ultra-low quiescent current dominates over thermal stability - e.g., energy-harvesting sensors with intermittent wake-up. |
Compared with TL431CDBVR and MAX6008BEUR+T, LM4051BEM3X-1.2/NOPB uniquely balances 1.225 V low-voltage compatibility, B-grade 0.2% accuracy, 50 ppm/°C tempco, and 60 μA min current - making it optimal for portable instrumentation and automotive monitoring where voltage headroom, precision, and thermal robustness are simultaneously constrained.
Availability
LM4051BEM3X-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and automotive battery monitoring requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LM4051BEM3X-1.2/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 and broad industrial portfolio coverage.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated, and high-accuracy measurement systems - designed to replace discrete Zener solutions with superior initial accuracy, thermal stability, and capacitive-load immunity.
FAQ
What is the exact output voltage and tolerance of LM4051BEM3X-1.2/NOPB?
The LM4051BEM3X-1.2/NOPB provides a fixed reverse breakdown voltage of 1.225 V with ±0.2% initial tolerance at 25°C (B-grade specification). This corresponds to a maximum deviation of ±2.45 mV at room temperature, confirmed in TI's SNOS491D datasheet Section 6.5. The device maintains this accuracy across its operating current range of 60 μA to 12 mA and temperature range of −40°C to +125°C.
Can LM4051BEM3X-1.2/NOPB operate without an output capacitor?
Yes, LM4051BEM3X-1.2/NOPB is explicitly designed to operate stably without any output capacitor - a key feature highlighted in its datasheet "Features" section. Its advanced internal architecture ensures stability even with capacitive loads up to 100 nF, eliminating the need for external stabilization components and reducing BOM count and PCB area in compact designs.
What is the minimum operating current for LM4051BEM3X-1.2/NOPB?
The LM4051BEM3X-1.2/NOPB requires a minimum cathode current of 60 μA across its full industrial temperature range (−40°C to +85°C) and extended range (−40°C to +125°C), as specified in Section 6.5 of the SNOS491D datasheet. At 25°C, the typical minimum is 39 μA, but design must guarantee ≥60 μA under worst-case conditions to maintain regulation.
How does LM4051BEM3X-1.2/NOPB differ from the adjustable LM4051-ADJ variants?
LM4051BEM3X-1.2/NOPB integrates internal feedback for fixed 1.225 V output, eliminating external resistors and associated thermal drift. In contrast, LM4051-ADJ requires external R1/R2 feedback and exhibits output voltage dependence on cathode current (ΔVREF/ΔIR up to 8 mV) and output voltage (ΔVREF/ΔVO = −1.69 mV/V). The fixed version offers superior accuracy, simpler layout, and no resistor-matching concerns.
What package and pin configuration does LM4051BEM3X-1.2/NOPB use?
LM4051BEM3X-1.2/NOPB uses the SOT-23-3 (DBZ) package with 3.00 mm × 1.30 mm body size. Pin 1 is Cathode (output), Pin 2 is Anode (ground), and Pin 3 is NC/FB - which must be left floating or connected to Pin 2. This configuration is validated in the "Pin Configuration and Functions" section (page 5) of the official TI datasheet SNOS491D.
LM4051BEM3X-1.2/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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051BEM3X-1.2/NOPB FAQ
1.How can I place an order for LM4051BEM3X-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BEM3X-1.2/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 LM4051BEM3X-1.2/NOPB reliable?
The price and inventory of LM4051BEM3X-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BEM3X-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051BEM3X-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BEM3X-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BEM3X-1.2/NOPB?
LM4051BEM3X-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BEM3X-1.2/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 LM4051BEM3X-1.2/NOPB?
For technical support, including LM4051BEM3X-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BEM3X-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051BEM3X-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051BEM3X-1.2/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 LM4051BEM3X-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051BEM3X-1.2/NOPB?
All LM4051BEM3X-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BEM3X-1.2/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 LM4051BEM3X-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051BEM3X-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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