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Texas Instruments LM4051BIM3-ADJ/NOPB
- Part No.:
- LM4051BIM3-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,443
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Product details
Overview
LM4051BIM3-ADJ/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering adjustable reverse breakdown voltage (1.24 V to 10 V), ±0.1% initial tolerance (A-grade), 20 μVrms wideband noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to +125°C. It serves as a stable reference in battery-powered data acquisition and portable instrumentation where space and low quiescent current are critical.
For engineers reviewing the LM4051BIM3-ADJ/NOPB datasheet, LM4051BIM3-ADJ/NOPB pinout, LM4051BIM3-ADJ/NOPB application, or LM4051BIM3-ADJ/NOPB equivalent, key selection criteria include its adjustable output range, no-output-capacitor-required stability, 60 μA minimum operating current, feedback-pin-based configuration, and guaranteed performance over extended industrial temperature range.
Technical Context
The LM4051BIM3-ADJ/NOPB operates as a curvature-corrected bandgap shunt reference with internal 1.212 V reference core. Its adjustable output is set via external resistor divider between cathode and anode, with feedback applied to the reference pin (Pin 3), enabling precise voltage regulation without requiring a series pass element.
It functions in closed-loop mode using internal error amplifier and reference, tolerating capacitive loads up to 10 nF without oscillation. The device maintains regulation across 60 μA–12 mA cathode current and exhibits <0.3 mV/V output voltage sensitivity to load changes at 100 μA bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external R1/R2 feedback network; enables flexible system-level voltage scaling. |
| Initial Tolerance (A Grade) | ±0.1% at 25°C - ensures high-accuracy ADC/DAC biasing without post-calibration in production. |
| Tempco (Max) | 50 ppm/°C (−40°C to +125°C) - supports stable operation in automotive under-hood and industrial control environments. |
| Wideband Noise | 20 μVrms (10 Hz–10 kHz) - minimizes quantization error in 16-bit+ data converters and precision analog front-ends. |
| Min Operating Current | 60 μA - enables ultra-low-power operation in coin-cell-powered sensors and energy-harvesting systems. |
| Dynamic Output Impedance | 0.3 Ω at 120 Hz (VOUT = VREF) - provides low-impedance reference node for fast transient load steps in active filters and comparators. |
| Thermal Hysteresis | 0.3 mV/V - limits voltage drift after thermal cycling, critical for repeatable calibration in field-deployed test equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm footprint, surface-mount, lead-free (NOPB), rated for 280 mW power dissipation at 25°C ambient.
| 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 for proper regulation. |
| Cathode (Pin 1) | Shunt current input / regulated output | Primary current sink terminal; output voltage appears here relative to Anode; connects to RS and load. |
| Feedback (Pin 3) | Reference voltage sensing input | High-impedance (70–130 nA) input that samples divided output voltage; determines regulation point via R1/R2 ratio. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load up to 10 nF - eliminates BOM cost and board area for bypass caps in space-constrained designs. |
| Adjustable output architecture | 1.24 V–10 V range via external resistive divider - replaces multiple fixed-voltage references with single SKU across product variants. |
| Micropower operation | 60 μA min cathode current - extends battery life in portable medical monitors and handheld meters beyond 10 years on CR2032. |
| Capacitive load tolerance | Stable with >10 nF output capacitance - supports direct connection to ADC sample-and-hold inputs without isolation resistors. |
| Extended temperature range | −40°C to +125°C operation - qualified for under-dash automotive modules and industrial motor drives without derating. |
Applications
| Portable Data Loggers | Battery Management Systems |
|---|---|
Use Scenario: Continuous 24/7 voltage and temperature logging in remote environmental sensors powered by Li-SOCl₂ cells. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V for 16-bit SAR ADC and microcontroller VREF. Use Value: 20 μVrms noise and 50 ppm/°C tempco ensure ≤0.01% measurement drift over full temperature range and 10-year deployment. |
Use Scenario: Cell voltage monitoring in 12S Li-ion packs for e-bikes, requiring accurate 3.0–4.2 V per-cell thresholds. IC Role / Device Role / Timing Role: Adjustable reference (set to 3.0 V) feeding comparator inputs for overvoltage/undervoltage detection. Use Value: 60 μA min current enables direct connection to high-impedance comparator inputs without loading error or startup delay. |
| Precision Instrumentation Amplifiers | Medical Patient Monitoring |
Use Scenario: Input stage of handheld ECG amplifier requiring rail-to-rail common-mode rejection and low-noise biasing. IC Role / Device Role / Timing Role: Dual LM4051BIM3-ADJ/NOPB units generating matched ±2.048 V references for differential ADC driver. Use Value: Matched tempco and low hysteresis (<0.3 mV/V) prevent baseline wander during patient temperature shifts and clinical re-calibration cycles. |
Use Scenario: Power supply supervision and analog front-end calibration in portable pulse oximeters with AAA battery operation. IC Role / Device Role / Timing Role: Reference for photodiode transimpedance amplifier gain-setting and LED current source regulation. Use Value: No-output-capacitor stability allows direct integration into compact flex PCB assemblies without compromising signal integrity or layout complexity. |
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 | Fixed 2.495 V output; 2% initial tolerance; requires external resistor for adjustment; higher 500 μA min cathode current. | Not suitable for sub-2.4 V or ultra-low-power designs; limited to applications where 2.5 V reference suffices and higher quiescent current is acceptable. | Select TL431CDBVR only when cost is primary constraint and 2.5 V fixed output meets system requirements. |
| MAX6126AASA+ | Series reference (not shunt); 4.096 V fixed; 0.04% initial accuracy; 3 ppm/°C tempco; requires input capacitor and load capacitor. | Cannot replace shunt topology directly; demands different PCB layout, higher supply headroom, and additional decoupling components. | Choose MAX6126AASA+ only for highest-precision applications needing <1 ppm/°C stability and where series topology is architecturally viable. |
Compared with TL431CDBVR and MAX6126AASA+, the LM4051BIM3-ADJ/NOPB uniquely combines adjustable output, micropower operation, and capacitor-free stability-making it optimal for space- and energy-constrained shunt-regulated systems where flexibility and simplicity are design priorities.
Availability
LM4051BIM3-ADJ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery management systems, and precision medical devices requiring stable component supply with long-term lifecycle assurance.
Supply support for LM4051BIM3-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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in precision analog ICs.
The LM4051-N family was designed specifically for space-constrained, low-power shunt reference applications-targeting portable instrumentation, battery-powered sensors, and industrial control systems demanding high accuracy without external compensation components.
FAQ
What is the minimum operating current for LM4051BIM3-ADJ/NOPB?
The LM4051BIM3-ADJ/NOPB requires a minimum cathode current of 60 μA across the industrial temperature range (−40°C to +85°C) and 65 μA across the extended range (−40°C to +125°C). This value is specified for A-grade devices and ensures stable regulation and full specification compliance. Below this threshold, output voltage may deviate beyond guaranteed tolerance bands.
How do I configure LM4051BIM3-ADJ/NOPB for a 5.0 V output?
To set LM4051BIM3-ADJ/NOPB to 5.0 V, connect a resistor divider between Cathode (Pin 1) and Anode (Pin 2), with the midpoint tied to Feedback (Pin 3). Using the standard equation VOUT = VREF × (1 + R1/R2) and VREF ≈ 1.212 V, select R1 = 3.12 kΩ and R2 = 1.00 kΩ for nominal 5.0 V. Confirm final value using Equation 4 from the datasheet to compensate for ∆VREF/∆VO = −1.69 mV/V.
Does LM4051BIM3-ADJ/NOPB require an output capacitor?
No, LM4051BIM3-ADJ/NOPB does not require an output capacitor for stability. Its internal design ensures unconditional stability with capacitive loads up to 10 nF. Adding an output capacitor is permissible and may reduce high-frequency noise but is never mandatory-enabling simplified layout in ultra-compact PCBs where every millimeter counts.
What is the temperature coefficient specification for LM4051BIM3-ADJ/NOPB?
The LM4051BIM3-ADJ/NOPB has a maximum temperature coefficient of 50 ppm/°C over the full operating range of −40°C to +125°C. This applies to all grade versions (A/B/C) and is guaranteed-not typical-ensuring predictable drift behavior in automotive and industrial environments where thermal gradients are severe and calibration intervals are infrequent.
Can LM4051BIM3-ADJ/NOPB be used in a series reference configuration?
No, LM4051BIM3-ADJ/NOPB is strictly a shunt voltage reference and cannot operate as a series reference. It regulates by sinking variable current through the cathode to maintain a constant voltage between cathode and anode. Attempting series configuration violates absolute maximum ratings and will result in improper regulation or device damage.
LM4051BIM3-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:
- ±0.2%
- 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
LM4051BIM3-ADJ/NOPB FAQ
1.How can I place an order for LM4051BIM3-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3-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 LM4051BIM3-ADJ/NOPB reliable?
The price and inventory of LM4051BIM3-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 LM4051BIM3-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051BIM3-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIM3-ADJ/NOPB?
LM4051BIM3-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3-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 LM4051BIM3-ADJ/NOPB?
For technical support, including LM4051BIM3-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051BIM3-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3-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 LM4051BIM3-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051BIM3-ADJ/NOPB?
All LM4051BIM3-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3-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 LM4051BIM3-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051BIM3-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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