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Analog Devices Inc./Maxim Integrated LM4051AEX3-1.2+T
- Part No.:
- LM4051AEX3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- SC-70, SOT-323
- Datasheet:
-
LM4051AEX3-1.2+T.pdf
- Description:
- IC VREF SHUNT 1.225V SC70
- Quantity:
- Payment:
- Shipping:
Inventory:1,115
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Product details
Overview
LM4051AEX3-1.2+T from Analog Devices is a precision 1.225V, 0.1% 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 high-accuracy ADC/DAC biasing in space-constrained portable instrumentation.
For engineers reviewing the LM4051AEX3-1.2+T datasheet, LM4051AEX3-1.2+T pinout, LM4051AEX3-1.2+T application, or LM4051AEX3-1.2+T equivalent, key selection criteria include guaranteed 0.1% initial tolerance at +25°C, no-output-capacitor stability, AEC-Q100 qualification for automotive use, and SC70 thermal performance (θJA = 340.4°C/W).
Technical Context
The LM4051AEX3-1.2+T implements a laser-trimmed bandgap core with two-terminal shunt topology, delivering fixed 1.225V reverse breakdown voltage without requiring external stabilization. Its dynamic impedance remains ≤1.5Ω (at 1mA, 120Hz), ensuring minimal output voltage shift across load current variations from 60µA to 15mA.
Designed for micropower operation, it maintains stable regulation across industrial and automotive temperature ranges (-40°C to +125°C) while tolerating any capacitive load and eliminating need for output capacitance - a critical advantage in low-noise sensor front-ends and battery-powered data acquisition systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal at +25°C; ±1.2mV (±0.1%) initial tolerance ensures precise biasing for 12-bit+ ADCs without calibration. |
| Tempco | ≤50ppm/°C over -40°C to +125°C; guarantees <±0.6% total voltage drift across full operating range. |
| Shunt Current Range | 60µA to 15mA; supports ultra-low-power sensor nodes and higher-current reference buffering with single resistor design. |
| Dynamic Impedance | ≤1.5Ω at 1mA/120Hz; minimizes load-induced voltage error in varying current-sink applications. |
| Wideband Noise | 28µVRMS (10Hz–10kHz); enables high-resolution measurement circuits where reference noise dominates system ENOB. |
| Long-Term Stability | 120ppm after 1000 hours; ensures minimal calibration drift in deployed industrial monitoring equipment. |
| Package | 3-pin SC70 (1.8mm × 1.8mm); 50% smaller than SOT23, ideal for wearables and compact medical sensors. |
Pinout & Package
LM4051AEX3-1.2+T uses a 3-pin SC70 surface-mount package (outline 21-0075, land pattern 90-0208) with 340.4°C/W junction-to-ambient thermal resistance on a four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Positive terminal (anode) | Connected to system ground or low-impedance return path; forms cathode-to-anode reference node with Pin 2. |
| 2 (–) | Negative terminal (cathode) | Reference output node; sinks shunt current to maintain 1.225V across load; connects to supply rail via series resistor. |
| 3 (N.C.) | No connection | Must be left unconnected or tied to Pin 2; no internal function - avoids parasitic coupling in high-PSRR layouts. |
Key Features
| Feature | Design Value |
|---|---|
| 0.1% initial accuracy | Eliminates factory calibration for mid-resolution data converters in portable test equipment. |
| No output capacitor required | Simplifies PCB layout and reduces BOM count in space-limited IoT edge nodes. |
| AEC-Q100 qualified | Validated for automotive cabin control modules and ADAS sensor interfaces requiring extended temperature reliability. |
| Stable with capacitive loads | Enables direct connection to ADC input capacitors or long traces without oscillation risk. |
| 28µVRMS low noise | Preserves SNR in 16-bit SAR ADC applications where reference noise limits effective resolution. |
Applications
| Portable Medical Sensors | Automotive Cabin Control |
|---|---|
|
Use Scenario: Battery-powered ECG front-end with 16-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225V bias for ADC VREF, replacing larger three-terminal references. Use Value: SC70 footprint saves >0.5mm² board area; 60µA min current enables operation down to 2.2V supply with coin-cell batteries. |
Use Scenario: HVAC control module measuring thermistor networks in passenger compartment. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric sensor excitation and ADC reference in microcontroller-based subsystem. Use Value: AEC-Q100 qualification and -40°C to +125°C operation ensure reliability across vehicle lifetime and environmental extremes. |
| Industrial Data Loggers | Wearable Health Monitors |
|
Use Scenario: Low-power environmental logger with multi-channel 12-bit SAR ADC. IC Role / Device Role / Timing Role: Micropower shunt reference supplying stable VREF to ADC and analog front-end op-amps. Use Value: 28µVRMS noise and ≤1.5Ω dynamic impedance prevent gain error and offset drift during battery voltage sag. |
Use Scenario: Optical heart-rate sensor module with photodiode transimpedance amplifier. IC Role / Device Role / Timing Role: Low-noise, space-efficient reference for TIA biasing and ADC conversion in wrist-worn form factor. Use Value: 1.8mm × 1.8mm SC70 package fits within 3.5mm-diameter optical stack; 0.1% accuracy enables clinical-grade SpO₂ calculation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4051AEM3-1.2+T | SOT23-3 package (2.92mm × 1.3mm); θJA = 336°C/W; top mark FZTO. | Better thermal dissipation at higher ambient temperatures; requires larger PCB footprint. | Select when board layout allows SOT23 and thermal margin is constrained above 85°C ambient. |
| MAX6002AEUR+T | 1.225V, 0.1% accuracy, SC70 package; 35µVRMS noise; 65µA–10mA operating range. | Higher noise and narrower current range limit use in high-SNR or wide-load applications. | Consider only if dual-sourcing is required and system tolerates +7µVRMS noise penalty and reduced headroom at 15mA. |
Compared with LM4051AEX3-1.2+T, the LM4051AEM3-1.2+T offers superior thermal performance but sacrifices 50% board area efficiency, while MAX6002AEUR+T trades measurable noise and current-range degradation for second-source flexibility - neither is pin-compatible, but both serve overlapping precision shunt reference roles.
Availability
LM4051AEX3-1.2+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin controls, industrial data loggers, and wearable health monitors requiring stable component supply with guaranteed long-term availability.
Supply support for LM4051AEX3-1.2+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, zero-capacitor stability, and AEC-Q100 compliance.
FAQ
What is the exact output voltage tolerance of LM4051AEX3-1.2+T at +25°C?
The LM4051AEX3-1.2+T has a guaranteed ±1.2mV (±0.1%) initial tolerance at +25°C, corresponding to a 1.2238V to 1.2262V range. This tight tolerance is achieved via laser trimming and is specified in the Electrical Characteristics table under "Reverse Breakdown Voltage" for the LM4051A grade. The value applies strictly at room temperature before thermal drift or long-term aging effects.
Does LM4051AEX3-1.2+T require an external output capacitor for stability?
No, LM4051AEX3-1.2+T does not require an external output capacitor for stability. Its internal architecture ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or long PCB traces. This eliminates capacitor-related BOM cost, placement area, and potential resonance issues common in three-terminal references.
What is the minimum shunt current needed for proper regulation of LM4051AEX3-1.2+T?
The LM4051AEX3-1.2+T requires a minimum shunt current of 60µA to maintain regulation across its full temperature range (-40°C to +125°C). Below this threshold, output voltage accuracy degrades significantly. Designers must size the series resistor (RS) to guarantee ≥60µA shunt current even at minimum supply voltage and maximum load current.
Is LM4051AEX3-1.2+T qualified for automotive applications?
Yes, LM4051AEX3-1.2+T is AEC-Q100 qualified for automotive applications. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and electrical reliability - confirming suitability for cabin control modules, body electronics, and non-safety-critical ADAS sensor interfaces operating from -40°C to +125°C.
How does the noise performance of LM4051AEX3-1.2+T compare to other 1.2V shunt references?
LM4051AEX3-1.2+T delivers 28µVRMS wideband noise (10Hz–10kHz), among the lowest in its class. This is 7µVRMS lower than MAX6002AEUR+T (35µVRMS) and significantly better than standard Zener-based references (>100µVRMS), making it optimal for 16-bit+ data acquisition where reference noise directly limits effective resolution.
LM4051AEX3-1.2+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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.1%
- 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
LM4051AEX3-1.2+T FAQ
1.How can I place an order for LM4051AEX3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AEX3-1.2+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 LM4051AEX3-1.2+T reliable?
The price and inventory of LM4051AEX3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AEX3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4051AEX3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AEX3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AEX3-1.2+T?
LM4051AEX3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AEX3-1.2+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 LM4051AEX3-1.2+T?
For technical support, including LM4051AEX3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AEX3-1.2+T requirements.
6.How does Aetrix verify that LM4051AEX3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051AEX3-1.2+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 LM4051AEX3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4051AEX3-1.2+T?
All LM4051AEX3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AEX3-1.2+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 LM4051AEX3-1.2+T part is unused and in its original packaging.
Return procedure for LM4051AEX3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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