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Analog Devices Inc./Maxim Integrated LM4051BEM3-1.2+T
- Part No.:
- LM4051BEM3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BEM3-1.2+T.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,605
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Product details
Overview
LM4051BEM3-1.2+T from Analog Devices is a precision 1.225V, two-terminal shunt voltage reference in SC70-3 package, featuring ±0.2% initial accuracy, 50ppm/°C max temperature coefficient, and 60µA–15mA operating current range. It delivers stable reverse breakdown voltage for ADC/DAC biasing, sensor excitation, and portable power monitoring circuits.
For engineers reviewing the LM4051BEM3-1.2+T datasheet, LM4051BEM3-1.2+T pinout, LM4051BEM3-1.2+T application, or LM4051BEM3-1.2+T equivalent, key selection criteria include guaranteed -40°C to +125°C operation, no external capacitor requirement, low 28µVRMS noise (10Hz–10kHz), and AEC-Q100 qualification for automotive use cases.
Technical Context
The LM4051BEM3-1.2+T uses bandgap-based shunt regulation to maintain a precise 1.225V reverse breakdown voltage across its terminals when biased with 60µA–15mA cathode-to-anode current. Its internal laser-trimmed resistor network ensures tight initial tolerance without external trimming.
It operates as a two-terminal device with no ground reference required, sinking all excess current through its cathode terminal. Stability is maintained across capacitive loads up to ≥1µF and over full industrial temperature range without output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal reverse breakdown voltage at +25°C; ±0.2% initial accuracy (±2.4mV) over full -40°C to +125°C range |
| Temperature Coefficient | ≤50ppm/°C max; ensures ≤±0.7% total voltage drift over full temperature range |
| Operating Current Range | 60µA minimum to 15mA maximum shunt current; enables ultra-low-power sensor biasing and high-current reference buffering |
| Dynamic Impedance | ≤1.5Ω at 1mA/120Hz; maintains voltage stability under dynamic load transients |
| Wideband Noise | 28µVRMS (10Hz–10kHz); suitable for high-resolution 16-bit+ data acquisition systems |
| Long-Term Stability | 120ppm after 1000 hours; supports precision instrumentation requiring multi-year calibration integrity |
Pinout & Package
LM4051BEM3-1.2+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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (+) | Positive terminal (anode) | Connects to system ground or low-side reference point; forms cathode-to-anode bias path |
| Pin 2 (–) | Negative terminal (cathode) | Current sink node; connects to supply rail via series resistor (RS) to establish regulated voltage |
| Pin 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; no internal function or electrical tie |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70-3 package | 1.8mm × 1.8mm footprint enables space-constrained designs in wearables and compact IoT nodes |
| No output capacitor required | Stable with any capacitive load (0–1µF+); eliminates BOM cost and layout area for decoupling |
| AEC-Q100 qualified | Rated for automotive applications per Grade 1 (-40°C to +125°C junction) |
| Low micropower operation | 60µA minimum shunt current enables battery life extension in always-on sensor modules |
| Tolerates forward conduction | Withstands up to 10mA anode-to-cathode current; supports bidirectional protection in mixed-signal interfaces |
Applications
| Portable Medical Sensors | Automotive Cabin Control Units |
|---|---|
|
Use Scenario: Reference for thermistor-based temperature sensing in handheld pulse oximeters. IC Role / Device Role / Timing Role: Provides stable 1.225V excitation voltage for ratiometric ADC conversion of analog sensor outputs. Use Value: Enables <1°C measurement accuracy over -20°C to +50°C ambient due to 50ppm/°C tempco and low 28µVRMS noise. |
Use Scenario: Voltage reference for HVAC actuator position feedback in dashboard control modules. IC Role / Device Role / Timing Role: Supplies precision bias to potentiometer interface circuitry operating across automotive temperature extremes. Use Value: Guarantees consistent 1.225V output from -40°C to +125°C, eliminating calibration drift in cabin climate control loops. |
| Industrial Data Loggers | Smart Energy Meters |
|
Use Scenario: Reference source for 16-bit SAR ADC measuring 4–20mA loop signals in remote telemetry units. IC Role / Device Role / Timing Role: Shunt reference connected between ADC reference input and system ground, sinking variable current via RS resistor. Use Value: 120ppm long-term stability ensures <0.02% gain error accumulation over 5-year field deployment without recalibration. |
Use Scenario: Calibration reference for metrology-grade voltage measurement channels in residential smart meters. IC Role / Device Role / Timing Role: Two-terminal shunt device providing isolated 1.225V reference independent of main supply rails. Use Value: No external capacitor requirement simplifies safety-certified PCB layout while maintaining IEC 62053-21 Class 0.2 accuracy compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Adjustable 1.24V reference (2.5V max), 0.5% initial accuracy, 100ppm/°C tempco, SOT23-3 | Requires external resistors for 1.225V setting; higher tempco reduces wide-temp stability | Select when adjustable output or lower cost is prioritized over precision and tempco performance |
| MAX6008AEUR+T | Fixed 1.25V output, 0.2% accuracy, 75ppm/°C tempco, SOT23-3, 50µA–10mA range | Slightly higher nominal voltage (1.25V vs. 1.225V); wider tempco impacts high-temp accuracy | Choose for legacy MAXIM-design ecosystems where 1.25V is acceptable and SC70 footprint is not mandatory |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4051BEM3-1.2+T offers tighter 1.225V matching, superior 50ppm/°C tempco, and SC70 size advantage-critical for next-gen portable and automotive modules demanding minimal board area and long-term calibration integrity.
Availability
LM4051BEM3-1.2+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin control units, industrial data loggers, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4051BEM3-1.2+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 technologies, serving industrial, automotive, communications, and healthcare markets with precision components since 1965.
LM4051BEM3-1.2+T belongs to the LM4050/LM4051 family of micropower shunt references designed specifically for space-constrained, battery-operated, and automotive-grade applications requiring high initial accuracy and low temperature drift.
FAQ
What is the exact output voltage tolerance of LM4051BEM3-1.2+T over temperature?
The LM4051BEM3-1.2+T has ±0.2% initial accuracy at +25°C (±2.4mV), and its total tolerance over -40°C to +125°C is ±0.7%, combining initial error and 50ppm/°C tempco drift. This equates to ±8.5mV maximum deviation from 1.225V across the full range, as confirmed in the Electrical Characteristics table for LM4051B grade.
Does LM4051BEM3-1.2+T require an external capacitor for stability?
No, LM4051BEM3-1.2+T does not require an external output capacitor and remains stable with any capacitive load-including 0µF up to ≥1µF-as explicitly stated in the Features section and verified in Typical Operating Characteristics (Figure 14–15). This eliminates layout constraints and BOM overhead.
What is the minimum operating current for LM4051BEM3-1.2+T?
The LM4051BEM3-1.2+T requires a minimum shunt current of 60µA to maintain regulation, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this threshold, reverse breakdown voltage becomes unstable and may deviate beyond guaranteed limits.
Is LM4051BEM3-1.2+T qualified for automotive applications?
Yes, LM4051BEM3-1.2+T is AEC-Q100 qualified (Grade 1) for automotive use, with guaranteed operation from -40°C to +125°C ambient temperature and robust long-term stability-making it suitable for cabin control, body electronics, and ADAS subsystems where reliability is critical.
How does the SC70-3 package of LM4051BEM3-1.2+T compare to SOT23 versions?
The LM4051BEM3-1.2+T uses SC70-3 (1.8mm × 1.8mm), which is 50% smaller than standard SOT23-3 (2.9mm × 1.6mm). This reduces PCB area by >40%, improves thermal response, and enables denser layouts in portable and automotive modules-without sacrificing electrical performance or temperature rating.
LM4051BEM3-1.2+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- 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:
- 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:
- SOT-23-3
LM4051BEM3-1.2+T FAQ
1.How can I place an order for LM4051BEM3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BEM3-1.2+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 LM4051BEM3-1.2+T reliable?
The price and inventory of LM4051BEM3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BEM3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4051BEM3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BEM3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BEM3-1.2+T?
LM4051BEM3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BEM3-1.2+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 LM4051BEM3-1.2+T?
For technical support, including LM4051BEM3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BEM3-1.2+T requirements.
6.How does Aetrix verify that LM4051BEM3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051BEM3-1.2+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 LM4051BEM3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4051BEM3-1.2+T?
All LM4051BEM3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BEM3-1.2+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 LM4051BEM3-1.2+T part is unused and in its original packaging.
Return procedure for LM4051BEM3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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