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Analog Devices Inc./Maxim Integrated LM4051CEM3-1.2+T
- Part No.:
- LM4051CEM3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CEM3-1.2+T.pdf
- Description:
- IC VREF SHUNT 1.225V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
LM4051CEM3-1.2+T from Analog Devices is a precision 1.225V, ±0.5% initial accuracy, 50ppm/°C max temperature coefficient shunt voltage reference in a 3-pin SC70 package. It operates over -40°C to +125°C with 60µA–15mA shunt current capability and 28µVRMS wideband noise (10Hz–10kHz), enabling stable reference generation in space-constrained battery-powered systems.
For engineers reviewing the LM4051CEM3-1.2+T datasheet, LM4051CEM3-1.2+T pinout, LM4051CEM3-1.2+T application, or LM4051CEM3-1.2+T equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade thermal performance, and real-world design implications for portable instrumentation and low-power sensor interfaces.
Technical Context
The LM4051CEM3-1.2+T implements a laser-trimmed bandgap core with two-terminal shunt topology, delivering fixed 1.225V reverse breakdown voltage without requiring external stabilization capacitors. Its internal architecture maintains regulation across 60µA–15mA shunt current while tolerating any capacitive load.
Guaranteed over -40°C to +125°C, it achieves ≤50ppm/°C temperature coefficient and ≤120ppm long-term stability (1000h), with dynamic impedance of 0.5–1.5Ω at 1mA/120Hz - enabling high-accuracy ADC/DAC biasing and precision analog front-ends where supply headroom is limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal at +25°C; ±0.5% initial tolerance (±6.1mV) ensures tight system-level calibration without post-production trimming. |
| Tempco | ≤50ppm/°C over -40°C to +125°C; translates to ±6.1mV max drift across full range - critical for automotive and industrial sensors. |
| Shunt Current Range | 60µA to 15mA; supports ultra-low-power sleep modes (e.g., 60µA IoT wake-up references) and higher-current precision DACs. |
| Dynamic Impedance | 0.5–1.5Ω at 1mA/120Hz; minimizes output voltage shift under load transients, improving ADC reference stability during sampling bursts. |
| Wideband Noise | 28µVRMS (10Hz–10kHz); enables <16-bit effective resolution in precision data acquisition without additional filtering. |
| Long-Term Stability | 120ppm after 1000h; ensures reference integrity over product lifetime in medical and test equipment. |
| Operating Temp | -40°C to +125°C; qualified for under-hood automotive and industrial control applications without derating. |
Pinout & Package
LM4051CEM3-1.2+T uses a 3-pin SC70 surface-mount package (1.8mm × 1.8mm), 50% smaller than SOT23. Pin 3 is no-connect (N.C.) and must be left unconnected or tied to Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Positive terminal (anode) | Reference output node; connects to load or feedback network - must be decoupled locally if driving high-frequency loads. |
| 2 (-) | Negative terminal (cathode) | Ground reference point; serves as return path for shunt current - requires low-impedance PCB connection to minimize IR drop. |
| 3 (N.C.) | No connection | Must remain floating or shorted to Pin 2; not internally bonded - incorrect connection risks mechanical stress or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SC70 package | 1.8mm × 1.8mm footprint saves >50% board area vs. SOT23 - essential for wearable health monitors and compact IoT nodes. |
| No output capacitor required | Internally compensated for stability with any capacitive load - eliminates BOM cost and layout risk from external COUT. |
| 60µA minimum operating current | Enables micropower operation in battery-backed RTCs and energy-harvesting systems where quiescent current is critical. |
| AEC-Q100 qualified | Validated for automotive applications per AEC-Q100 Rev G - supports infotainment power management and ADAS sensor references. |
| 28µVRMS low noise | Reduces quantization error in 16-bit+ SAR ADCs without adding LDO filtering - simplifies signal chain design. |
Applications
| Portable Medical Sensors | Automotive Cabin Sensors |
|---|---|
|
Use Scenario: Continuous glucose monitor (CGM) analog front-end requiring stable 1.225V reference for biosignal amplification and 16-bit ADC conversion. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precise bias voltage for op-amp gain stages and ADC VREF input. Use Value: ±0.5% initial accuracy and 50ppm/°C tempco ensure <±0.5% measurement error across body temperature range (32–42°C), meeting ISO 15197 clinical requirements. |
Use Scenario: Occupancy detection using MEMS pressure sensors in automotive seat cushions, powered by 12V battery with wide ambient temperature swings. IC Role / Device Role / Timing Role: Shunt reference supplying regulated 1.225V to sensor signal conditioning circuitry and microcontroller ADC. Use Value: -40°C to +125°C operation and AEC-Q100 qualification guarantee reliable performance during cold cranking and under-hood thermal cycling. |
| Industrial Process Transmitters | Low-Power Wireless Sensor Nodes |
|
Use Scenario: 4–20mA loop-powered temperature transmitter with HART modulation, where PCB space and self-heating are constrained. IC Role / Device Role / Timing Role: Precision shunt reference generating stable excitation voltage for RTD bridge and reference for DAC-driven current loop. Use Value: 60µA–15mA shunt current range allows operation down to 3.3V supply while maintaining regulation - enabling single-supply 4–20mA design without boost converters. |
Use Scenario: Battery-operated soil moisture sensor node transmitting via LoRaWAN, requiring multi-year operation on CR2032 coin cell. IC Role / Device Role / Timing Role: Micropower shunt reference establishing accurate ADC reference for capacitive soil probe measurements. Use Value: 60µA minimum current and 28µVRMS noise enable sub-1% measurement repeatability over 10-year field deployment with minimal battery drain. |
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), 1% initial accuracy, 100ppm/°C tempco, SOT23-3 package. | Requires external resistors to set 1.225V; less accurate and higher drift than LM4051CEM3-1.2+T. | Select when adjustable output or cost sensitivity outweighs precision and thermal stability requirements. |
| MAX6008AEUR+T | Fixed 1.25V shunt reference, 0.2% initial accuracy, 75ppm/°C tempco, SOT23-3 package. | 0.025V higher nominal voltage and looser accuracy limit system calibration margin in 1.225V-critical designs. | Choose only if 1.25V output aligns with existing design constraints and 0.2% accuracy suffices for target application. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, LM4051CEM3-1.2+T provides tighter 1.225V matching, superior 0.5% initial accuracy, and lower 50ppm/°C tempco - making it optimal for high-precision, thermally demanding applications where reference-induced error must stay below 0.1%.
Availability
LM4051CEM3-1.2+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin sensors, industrial process transmitters, and low-power wireless sensor nodes requiring stable component supply with guaranteed long-term availability.
Supply support for LM4051CEM3-1.2+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 space-constrained, high-accuracy voltage reference needs in battery-powered and automotive systems - emphasizing micropower operation, ultra-stable tempco, and robust packaging.
FAQ
What is the exact output voltage tolerance of LM4051CEM3-1.2+T at +25°C?
The LM4051CEM3-1.2+T has a nominal reverse breakdown voltage of 1.225V at +25°C with ±0.5% initial accuracy, corresponding to a guaranteed range of 1.2189V to 1.2311V. This tolerance is laser-trimmed and specified in the Electrical Characteristics table for the "LM4051C" grade under TA = +25°C conditions.
Can LM4051CEM3-1.2+T operate without an external capacitor?
Yes, LM4051CEM3-1.2+T does not require an external output capacitor for stability and remains stable with any capacitive load. This is confirmed in the General Description and Applications Information sections, eliminating need for COUT in space-constrained designs like wearables or sensor nodes.
What is the minimum shunt current required for LM4051CEM3-1.2+T to maintain regulation?
The LM4051CEM3-1.2+T requires a minimum shunt current of 60µA to maintain regulation across its full operating temperature range (-40°C to +125°C). This value is specified in the Electrical Characteristics table under "Minimum Operating Current (IRMIN)" for the LM4051C grade.
Is LM4051CEM3-1.2+T qualified for automotive applications?
Yes, LM4051CEM3-1.2+T is AEC-Q100 qualified, as explicitly stated in the Features section and Ordering Information. It meets automotive reliability standards for temperature cycling, humidity, and mechanical stress - supporting use in cabin sensors, body control modules, and ADAS subsystems.
What package type and dimensions does LM4051CEM3-1.2+T use?
LM4051CEM3-1.2+T uses the 3-pin SC70 package (outline number 21-0075), measuring 1.8mm × 1.8mm with 0.5mm pitch. This ultra-small footprint is 50% smaller than comparable SOT23 devices and is documented in the Package Information section with land pattern number 90-0208.
LM4051CEM3-1.2+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:
- ±0.5%
- 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
LM4051CEM3-1.2+T FAQ
1.How can I place an order for LM4051CEM3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CEM3-1.2+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 LM4051CEM3-1.2+T reliable?
The price and inventory of LM4051CEM3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CEM3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4051CEM3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CEM3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CEM3-1.2+T?
LM4051CEM3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CEM3-1.2+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 LM4051CEM3-1.2+T?
For technical support, including LM4051CEM3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CEM3-1.2+T requirements.
6.How does Aetrix verify that LM4051CEM3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051CEM3-1.2+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 LM4051CEM3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4051CEM3-1.2+T?
All LM4051CEM3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CEM3-1.2+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 LM4051CEM3-1.2+T part is unused and in its original packaging.
Return procedure for LM4051CEM3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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