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Texas Instruments LM4051BEM3-1.2/NOPB
- Part No.:
- LM4051BEM3-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BEM3-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,273
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Product details
Overview
LM4051BEM3-1.2/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 ±2.4 mV (±0.196%) initial tolerance at 25°C, 50 ppm/°C max temperature coefficient, and 20 μVrms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 12 mA and supports −40°C to +125°C extended industrial temperature range - used in high-accuracy ADC biasing, portable sensor signal conditioning, and low-power energy metering.
For engineers reviewing the LM4051BEM3-1.2/NOPB datasheet, LM4051BEM3-1.2/NOPB pinout, LM4051BEM3-1.2/NOPB application, or LM4051BEM3-1.2/NOPB equivalent, key selection considerations include its grade-B initial accuracy, no-output-capacitor-required stability, cathode-anode terminal configuration, and compatibility with space-constrained battery-powered systems requiring sub-1.3 mm height and <100 μA quiescent current.
Technical Context
The LM4051BEM3-1.2/NOPB implements a curvature-corrected bandgap shunt reference architecture with internal fuse and zener-zap voltage trimming, enabling ±2.4 mV (0.196%) initial accuracy at 25°C. Its operation relies on regulating output voltage by dynamically shunting current between cathode and anode terminals based on input supply and load conditions.
It functions exclusively in closed-loop mode with internal feedback, requiring only an external series resistor (RS) to set operating current. The device maintains stability across capacitive loads without mandatory bypass capacitance and exhibits thermal hysteresis of ≤0.36 mV/V after cycling from −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown - sets precise bias point for ADCs, DACs, and comparators without external resistive dividers. |
| Initial Tolerance (25°C) | ±2.4 mV (±0.196%) - grade-B specification ensures predictable system offset in production calibration. |
| Tempco (−40°C to +125°C) | 50 ppm/°C max - limits voltage drift to ±6.3 mV over full range, critical for temperature-stable instrumentation. |
| Operating Current Range | 60 μA to 12 mA - enables ultra-low-power operation in sleep modes while supporting fast transient response in active states. |
| Output Noise (10 Hz–10 kHz) | 20 μVrms - minimizes added noise in high-resolution data acquisition front-ends (e.g., 16-bit+ SAR ADCs). |
| Dynamic Impedance | 0.5 Ω at 1 mA / 120 Hz - ensures minimal load regulation error (<0.6 mV at 1.2 mA load change) in precision references. |
| Long-Term Stability | 120 ppm over 1000 hrs - guarantees minimal aging-induced calibration drift in field-deployed medical or industrial equipment. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm × 1.02 mm nominal body size, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Must be connected to system ground or low-impedance return path; serves as common reference for cathode voltage regulation. |
| Cathode (Pin 1) | Shunt current input/output | Connects to unregulated supply via RS; regulates voltage at this node to 1.225 V relative to anode - primary power and feedback node. |
| NC (Pin 3) | No-connect terminal | Internally floating; must be left unconnected or tied to Pin 2 (anode) per TI design guidance - not usable as feedback or output. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables stable operation without external bypass - reduces BOM count and PCB area in wearables and implantables. |
| Tolerates capacitive loads | Maintains phase margin >45° with up to 10 μF output capacitance - simplifies interface with ADC sample-and-hold or op-amp buffers. |
| Sub-miniature SOT-23 package | 3.0 × 1.3 mm footprint - fits within 2.5 mm² board area, ideal for space-constrained IoT sensor nodes and portable diagnostics. |
| Grade-B precision (±2.4 mV) | Balances cost and performance for applications needing better than ±0.5% but not A-grade ±1.2 mV accuracy. |
| Extended temp range support | Guaranteed operation from −40°C to +125°C - suitable for under-hood automotive sensors and industrial motor drives. |
Applications
| Portable Medical Sensors | Energy Metering IC Biasing |
|---|---|
Use Scenario: Powering analog front-end of wearable ECG/PPG modules with single-cell Li-ion supply (2.7–4.2 V) and tight size constraints. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V bias to instrumentation amplifier and 16-bit delta-sigma ADC. Use Value: Enables <1 LSB INL error over temperature due to 50 ppm/°C tempco and 20 μVrms noise - critical for clinical-grade signal fidelity. | Use Scenario: Reference source for metrology-grade polyphase energy meter ASICs operating in harsh industrial cabinets. IC Role / Device Role / Timing Role: Precision voltage reference for ADC conversion and internal calibration routines in ADE78xx-class devices. Use Value: Delivers long-term stability (120 ppm/1000 hrs) and −40°C to +125°C operation - ensures billing accuracy compliance over 15-year product lifetime. |
| Low-Power Data Loggers | Automotive Cabin Pressure Sensors |
Use Scenario: Battery-operated environmental monitor logging temperature/humidity every 5 minutes using coin-cell supply. IC Role / Device Role / Timing Role: Micropower shunt reference supplying regulated 1.225 V to ultra-low-IQ microcontroller ADC and sensor interface. Use Value: 60 μA minimum operating current extends 220 mAh CR2032 battery life to >5 years in deep-sleep cycles - verified per TI SNOS491D test data. | Use Scenario: Pressure transducer excitation and signal conditioning in HVAC control modules mounted near vehicle cabin air ducts. IC Role / Device Role / Timing Role: Stable reference for bridge amplifier and ratiometric ADC in MEMS pressure sensing subsystem. Use Value: Grade-B tolerance (±2.4 mV) and 50 ppm/°C tempco meet AEC-Q200 Class 2 requirements for ±0.5% total error band over −40°C to +105°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040BIM3-1.2/NOPB | Higher initial tolerance (±0.2%), same 1.225 V, 50 ppm/°C tempco, but requires ≥65 μA min current and lacks extended-temp grade-B variant. | Not qualified for −40°C to +125°C operation - limited to industrial −40°C to +85°C range. | Select when cost sensitivity outweighs extended temperature need and 65 μA min current is acceptable. |
| REF3012AIDBZR | Series reference (not shunt), 1.2 V output, ±0.2% initial accuracy, 50 ppm/°C tempco, 50 μA typical IQ, but requires output capacitor and has higher dropout. | Cannot replace shunt topology directly - demands redesign of current-sourcing circuitry and layout. | Choose only if system architecture permits series reference use and board space allows added 1-μF output capacitor. |
Compared with LM4040BIM3-1.2/NOPB, LM4051BEM3-1.2/NOPB offers guaranteed extended temperature operation and lower minimum current; versus REF3012AIDBZR, it preserves shunt topology simplicity and eliminates output capacitor dependency - critical for retrofitting legacy designs.
Availability
LM4051BEM3-1.2/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, energy metering IC biasing, and low-power data loggers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM4051BEM3-1.2/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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer markets.
The LM4051-N product line delivers precision micropower shunt references optimized for space-constrained, battery-operated systems where stability, low quiescent current, and no-output-capacitor operation are essential design requirements.
FAQ
What is the exact output voltage and tolerance of LM4051BEM3-1.2/NOPB at 25°C?
The LM4051BEM3-1.2/NOPB delivers a nominal reverse breakdown voltage of 1.225 V with a grade-B initial tolerance of ±2.4 mV (±0.196%) at 25°C, as specified in Section 6.5 of the SNOS491D datasheet. This tolerance is production-tested and applies to all units shipped under this orderable part number.
Does LM4051BEM3-1.2/NOPB require an external output capacitor for stability?
No, LM4051BEM3-1.2/NOPB does not require an external output capacitor for stability. Its advanced internal design ensures unconditional stability with any capacitive load, including up to 10 μF, eliminating the need for output bypassing - a key advantage confirmed in the "Features" and "Detailed Description" sections of the TI datasheet.
What is the operating temperature range supported by LM4051BEM3-1.2/NOPB?
The LM4051BEM3-1.2/NOPB is rated for the extended industrial temperature range of −40°C to +125°C, with all electrical characteristics guaranteed across this full range. This is explicitly documented in Section 6.3 ("Recommended Operating Conditions") and validated in the "LM4051-1.2 Electrical Characteristics" table (Section 6.5) of the SNOS491D datasheet.
How is pin 3 configured on LM4051BEM3-1.2/NOPB, and what happens if it's left unconnected?
Pin 3 of LM4051BEM3-1.2/NOPB is a no-connect (NC) terminal. Per TI's Pin Functions table and Figure 5 (Pin Configuration), it must either be left floating or connected to Pin 2 (Anode); it is not internally bonded and carries no functional role. Leaving it unconnected poses no risk and is the default recommended configuration.
What is the minimum operating current required for LM4051BEM3-1.2/NOPB across temperature?
The LM4051BEM3-1.2/NOPB requires a minimum operating current of 70 μA across the extended temperature range (−40°C to +125°C), as specified in Section 6.5 of SNOS491D. At 25°C, the typical minimum is 39 μA, but design must ensure ≥70 μA under worst-case thermal conditions to maintain regulation.
LM4051BEM3-1.2/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:
- Active
- 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
LM4051BEM3-1.2/NOPB FAQ
1.How can I place an order for LM4051BEM3-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BEM3-1.2/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 LM4051BEM3-1.2/NOPB reliable?
The price and inventory of LM4051BEM3-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BEM3-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051BEM3-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BEM3-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BEM3-1.2/NOPB?
LM4051BEM3-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BEM3-1.2/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 LM4051BEM3-1.2/NOPB?
For technical support, including LM4051BEM3-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BEM3-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051BEM3-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051BEM3-1.2/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 LM4051BEM3-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051BEM3-1.2/NOPB?
All LM4051BEM3-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BEM3-1.2/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 LM4051BEM3-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051BEM3-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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