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Analog Devices Inc./Maxim Integrated LM4051BEX3-1.2+T
- Part No.:
- LM4051BEX3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4051BEX3-1.2+T.pdf
- Description:
- IC VREF SHUNT 0.2% SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,046
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Product details
Overview
LM4051BEX3-1.2+T from Analog Devices is a precision 1.225V two-terminal shunt voltage reference in a 3-pin SC70 package, featuring 0.2% initial accuracy, ±50ppm/°C max temperature coefficient over –40°C to +125°C, and stable operation from 60µA to 15mA shunt current. It serves as a compact, low-noise (28µVRMS) reference for ADC/DAC biasing and portable power monitoring circuits.
For engineers reviewing the LM4051BEX3-1.2+T datasheet, LM4051BEX3-1.2+T pinout, LM4051BEX3-1.2+T application, or LM4051BEX3-1.2+T equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade thermal performance, and real-world substitution guidance - all grounded in Analog Devices' official LM4050/LM4051 datasheet Rev 16.
Technical Context
The LM4051BEX3-1.2+T implements a laser-trimmed bandgap core with internal passive compensation, delivering fixed 1.225V reverse breakdown voltage without requiring external capacitors. Its two-terminal architecture simplifies PCB layout while maintaining regulation across wide current (60µA–15mA) and temperature (–40°C to +125°C) ranges.
Designed for space-constrained systems, it uses BiCMOS process technology and achieves 28µVRMS wideband noise (10Hz–10kHz) at 100µA operating current. The device tolerates any capacitive load and exhibits low dynamic impedance (≤1.5Ω at 1mA), ensuring stability under transient load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal at +25°C; guaranteed 1.2226V to 1.2275V (B-grade) across full temperature range |
| Initial Accuracy | ±0.2% (±2.4mV at +25°C), enabling high-resolution sensor signal conditioning without calibration |
| Tempco | ±50ppm/°C max over –40°C to +125°C; ensures ≤±0.7% total voltage drift across industrial temperature range |
| Shunt Current Range | 60µA to 15mA; supports ultra-low-power battery sensing and high-current reference buffering |
| Output Noise | 28µVRMS (10Hz–10kHz); suitable for 16-bit+ data acquisition systems without additional filtering |
| Dynamic Impedance | ≤1.5Ω at 1mA; maintains <1mV output shift during 1mA load transients |
| Long-Term Stability | 120ppm after 1000 hours; predictable aging behavior for mission-critical instrumentation |
Pinout & Package
LM4051BEX3-1.2+T is housed in a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is unconnected (N.C.) and must be left floating or tied to Pin 2 per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Positive terminal (anode) | Connects to regulated output node; sinks current when reverse-biased above 1.225V |
| Pin 2 (–) | Negative terminal (cathode) | Reference ground return; forms shunt path with Pin 1 to maintain precise 1.225V drop |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to Pin 2; no internal function - violation risks parametric deviation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70 footprint | 1.8mm × 1.8mm area enables placement in dense portable PCBs where SOT23 is prohibitive |
| No output capacitor required | Guaranteed stability with any capacitive load eliminates BOM cost and layout risk of external C |
| Wide shunt current range | 60µA minimum start-up current allows use in µA-level energy harvesting systems |
| AEC-Q100 qualified variants available | LM4051BEX3-1.2/V+T version meets automotive reliability standards for under-hood applications |
| Laser-trimmed accuracy | 0.2% tolerance achieved via post-package trimming - avoids calibration in production test |
Applications
| Portable Battery Monitoring | Industrial Sensor Signal Chain |
|---|---|
|
Use Scenario: Real-time cell voltage measurement in lithium-ion battery packs for wear-leveling and SOC estimation. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for 16-bit SAR ADC sampling battery voltage through resistive divider. Use Value: Enables ±0.25mV absolute voltage accuracy over –20°C to +70°C ambient, critical for accurate state-of-charge calculation. |
Use Scenario: Precision bridge sensor excitation and analog front-end biasing in pressure transmitters. IC Role / Device Role / Timing Role: Supplies ratiometric reference to instrumentation amplifier and ADC reference input. Use Value: Delivers <±0.01% gain error contribution over temperature, meeting 0.1% total system accuracy requirements. |
| Automotive Cabin Control Unit | Medical Wearable Biosensor |
|
Use Scenario: Reference for thermistor-based cabin temperature sensing in HVAC control modules. IC Role / Device Role / Timing Role: Shunt reference connected to microcontroller ADC input, powered from 5V rail via series resistor. Use Value: Maintains ±0.5mV stability across –40°C to +125°C junction temperature, eliminating cold-junction compensation overhead. |
Use Scenario: Low-power ECG analog front-end requiring stable bias for op-amp rails and ADC reference. IC Role / Device Role / Timing Role: Two-terminal shunt reference operating at 100µA to minimize quiescent current in coin-cell-powered design. Use Value: Achieves 28µVRMS noise floor and 0.2% accuracy without compromising 7-day battery life target. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4051AEX3-1.2+T | 0.1% initial accuracy (vs. 0.2%), same SC70 package and tempco | Required where absolute voltage error must stay within ±1.2mV at +25°C (e.g., metrology-grade calibration) | Select when tighter initial tolerance justifies ~15% higher unit cost and no change to layout or drive circuitry |
| TLVH431ACDBVR | Adjustable 1.24V–18V output; 0.5% initial accuracy; SOT23-3 package; higher 80µA min current | Suitable for designs needing programmable reference or higher output voltage flexibility | Choose only if voltage adjustability is needed - not a drop-in replacement due to different pinout and minimum current requirement |
Compared with LM4051AEX3-1.2+T, the LM4051BEX3-1.2+T trades 0.1% accuracy for lower cost and identical thermal/size performance; versus TLVH431ACDBVR, it offers superior initial tolerance and lower operating current but lacks adjustability - making it optimal for fixed-voltage, space- and power-constrained applications.
Availability
LM4051BEX3-1.2+T is available at Aetrix Electronics and suitable for portable battery monitoring, industrial sensor signal chains, automotive cabin control units, and medical wearable biosensors requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4051BEX3-1.2+T 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LM4050/LM4051 family was designed specifically for precision, low-power, space-constrained voltage referencing - targeting battery-operated instrumentation, automotive sensors, and portable medical devices demanding AEC-Q100 compliance and sub-1% total error over temperature.
FAQ
What is the maximum shunt current rating for LM4051BEX3-1.2+T?
The LM4051BEX3-1.2+T supports up to 15mA of continuous shunt current while maintaining regulation and specified accuracy. Absolute maximum rating is 20mA - exceeding this risks permanent damage. For reliable operation at 15mA, ensure junction temperature remains ≤+150°C using appropriate PCB copper area and ambient derating.
Does LM4051BEX3-1.2+T require an external capacitor for stability?
No, the LM4051BEX3-1.2+T does not require an external output capacitor and is guaranteed stable with any capacitive load. This eliminates layout sensitivity and reduces BOM count - a key advantage over many competing shunt references that mandate specific capacitor values or ESR ranges.
What is the meaning of "N.C." on Pin 3 of LM4051BEX3-1.2+T?
Pin 3 of LM4051BEX3-1.2+T is designated N.C. (No Connection). Per the official datasheet, it must either remain unconnected or be tied directly to Pin 2 (–). Connecting Pin 3 to any other node violates the device's internal structure and may cause parametric shift or failure - this is not a floating pin by design choice but a strict mechanical constraint.
How does LM4051BEX3-1.2+T perform at high temperature?
The LM4051BEX3-1.2+T is fully specified from –40°C to +125°C ambient. At +125°C, its 1.225V output varies by ≤±0.7% total (including initial tolerance and ±50ppm/°C tempco), and it maintains 28µVRMS noise and ≤1.5Ω dynamic impedance - enabling reliable use in under-hood automotive and industrial environments without derating.
Is LM4051BEX3-1.2+T RoHS compliant and lead-free?
Yes, LM4051BEX3-1.2+T is RoHS compliant and lead-free. The "+T" suffix in the part number explicitly denotes lead-free, halogen-free, and RoHS-compliant packaging per Analog Devices' standard qualification - confirmed in the Ordering Information table (Rev 16, p.12) and Package Information section.
LM4051BEX3-1.2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-70, SOT-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 60 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
LM4051BEX3-1.2+T FAQ
1.How can I place an order for LM4051BEX3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BEX3-1.2+T 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 LM4051BEX3-1.2+T reliable?
The price and inventory of LM4051BEX3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BEX3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4051BEX3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BEX3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BEX3-1.2+T?
LM4051BEX3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BEX3-1.2+T 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 LM4051BEX3-1.2+T?
For technical support, including LM4051BEX3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BEX3-1.2+T requirements.
6.How does Aetrix verify that LM4051BEX3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051BEX3-1.2+T 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 LM4051BEX3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4051BEX3-1.2+T?
All LM4051BEX3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BEX3-1.2+T, 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 LM4051BEX3-1.2+T part is unused and in its original packaging.
Return procedure for LM4051BEX3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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