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Analog Devices Inc./Maxim Integrated LM4051AEM3-1.2+T
- Part No.:
- LM4051AEM3-1.2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AEM3-1.2+T.pdf
- Description:
- IC VREF SHUNT 1.225V SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,178
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Product details
Overview
LM4051AEM3-1.2+T from Analog Devices is a precision 1.225V, 0.1% initial accuracy, 50ppm/°C temperature coefficient shunt voltage reference in a 3-pin SOT23 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 portable power systems.
For engineers reviewing the LM4051AEM3-1.2+T datasheet, LM4051AEM3-1.2+T pinout, LM4051AEM3-1.2+T application, or LM4051AEM3-1.2+T equivalent, this page delivers verified electrical specs, SC70/SOT23 package context, thermal performance data, and real-world design implications for battery-powered instrumentation and automotive sensor interfaces.
Technical Context
The LM4051AEM3-1.2+T implements a laser-trimmed bandgap core with two-terminal shunt topology, maintaining a fixed reverse breakdown voltage across its anode and cathode terminals when biased with 60µA–15mA of reverse current. Its internal architecture eliminates need for external stabilization capacitors while tolerating arbitrary output capacitance.
Guaranteed over -40°C to +125°C, it delivers ±1.2mV reverse breakdown voltage tolerance at +25°C (LM4051A grade), with dynamic impedance ≤1.5Ω at 1mA and long-term stability of 120ppm after 1000 hours - critical for high-reliability industrial and automotive applications requiring minimal calibration drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225V nominal reverse breakdown voltage, with ±1.2mV tolerance at +25°C - enables precise ADC/DAC biasing in low-voltage systems. |
| Initial Accuracy | 0.1% (±1.2mV) - supports high-resolution measurement circuits without post-manufacturing trimming. |
| Tempco | 50ppm/°C max over -40°C to +125°C - ensures <±0.6% total voltage drift across full operating range. |
| Shunt Current Range | 60µA to 15mA - accommodates ultra-low-power sensor nodes and higher-current analog front-ends. |
| Wideband Noise | 28µVRMS (10Hz–10kHz) - minimizes noise contribution in precision data acquisition paths. |
| Dynamic Impedance | ≤1.5Ω at 1mA - maintains voltage regulation stability under fast load transients. |
| Long-Term Stability | 120ppm after 1000h - reduces recalibration frequency in field-deployed equipment. |
Pinout & Package
LM4051AEM3-1.2+T uses a 3-pin SOT23 surface-mount package (1.8mm × 2.9mm footprint), optimized for high-density PCB layouts in portable electronics. Pin 3 is unconnected (N.C.) and must be left floating or tied to pin 2 per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+) | Anode (positive terminal) | Connects to system ground or low-impedance return path; serves as reference output node. |
| 2 (–) | Cathode (negative terminal) | Connected to supply rail via series resistor; sinks shunt current to regulate voltage at pin 1. |
| 3 (N.C.) | No connection | Must remain unconnected or shorted to pin 2; no internal function - avoids parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT23 package | 1.8mm × 2.9mm footprint - saves >50% board area vs. comparable SOT23 references and enables compact wearable designs. |
| No output capacitor required | Stable with any capacitive load - eliminates BOM cost and layout complexity associated with external stabilization components. |
| Low micropower operation | 60µA minimum shunt current - extends battery life in always-on IoT sensors and portable medical devices. |
| AEC-Q100 qualified variants available | Automotive-grade versions (e.g., /V suffix) meet stress testing requirements for under-hood and ADAS applications. |
| Laser-trimmed accuracy | 0.1% initial tolerance achieved via on-die resistor trimming - ensures first-pass yield in production test without calibration. |
Applications
| Battery-Powered Instrumentation | Automotive Sensor Interface |
|---|---|
|
Use Scenario: Portable multimeter measuring sub-100mV signals with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for ADC VREF input, rejecting supply ripple and temperature drift. Use Value: Enables ±0.1% absolute measurement accuracy over -20°C to +70°C ambient without recalibration. |
Use Scenario: Tire pressure monitoring system (TPMS) with MEMS pressure sensor and RF transmitter. IC Role / Device Role / Timing Role: Supplies precision bias voltage to sensor signal conditioning amplifier and ADC reference. Use Value: Maintains <±0.5% reference error across -40°C to +105°C, meeting ISO 26262 ASIL-B functional safety margin. |
| Industrial Process Controller | Medical Wearable Monitoring |
|
Use Scenario: Loop-powered 4–20mA transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Sets accurate current-sense threshold and ADC reference in isolated analog front-end. Use Value: Supports 0.1% full-scale linearity over 15-year product lifetime due to 120ppm/1000h long-term stability. |
Use Scenario: ECG patch with ultra-low-power analog front-end and Bluetooth LE radio. IC Role / Device Role / Timing Role: Delivers clean 1.225V reference to 12-bit delta-sigma ADC sampling biopotential signals. Use Value: 28µVRMS noise floor prevents degradation of SNR in microvolt-level cardiac signal acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AIDBZR | 2.5V adjustable (1.24V–18V) with 0.5% initial accuracy; 100ppm/°C tempco; requires external resistors for 1.225V setting. | Higher noise (60µVRMS), wider tolerance, and less stable over temperature than LM4051AEM3-1.2+T. | Choose only if adjustable output or higher voltage (>2.5V) is needed; not drop-in for 1.225V fixed use cases. |
| MAX6002EUR+T | 1.25V output, 0.2% initial accuracy, 75ppm/°C tempco, SC70-3 package; 100µA–10mA operating range. | Lower accuracy and higher tempco reduce system-level calibration margin; narrower current range limits flexibility. | Acceptable for cost-sensitive consumer applications where ±0.8% total error is acceptable; not recommended for industrial or automotive. |
Compared with TLVH431AIDBZR and MAX6002EUR+T, LM4051AEM3-1.2+T offers superior 0.1% initial accuracy, tighter 50ppm/°C tempco, lower 28µVRMS noise, and guaranteed 60µA–15mA operation - making it the optimal choice for high-precision, wide-temperature, low-noise shunt reference needs.
Availability
LM4051AEM3-1.2+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive sensor interfaces, and industrial process controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4051AEM3-1.2+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 since 1965.
LM4051AEM3-1.2+T belongs to the LM4050/LM4051 family of micropower shunt voltage references, designed specifically for space-constrained, low-power, high-accuracy applications in portable and harsh-environment electronics.
FAQ
What is the exact output voltage tolerance of LM4051AEM3-1.2+T at +25°C?
The LM4051AEM3-1.2+T has a reverse breakdown voltage of 1.225V with ±1.2mV (±0.1%) tolerance at +25°C, as specified for the 'A' grade in the Electrical Characteristics table. This tight tolerance is achieved via laser trimming and is guaranteed across the full -40°C to +125°C operating range with additional temperature-induced drift bounded by ±50ppm/°C.
Can LM4051AEM3-1.2+T operate without an external capacitor?
Yes, LM4051AEM3-1.2+T does not require an external output capacitor for stability and remains stable with any capacitive load - including 0pF up to several µF. This eliminates BOM cost and layout constraints, simplifying design for space-limited applications like wearables and sensor nodes where board area is at a premium.
What is the minimum shunt current required for proper regulation of LM4051AEM3-1.2+T?
The LM4051AEM3-1.2+T requires a minimum shunt current of 60µA to maintain regulation across its full operating temperature range. Below this level, output voltage accuracy degrades significantly. Designers must ensure the series resistor (RS) and supply voltage combination guarantees ≥60µA shunt current even at worst-case conditions (minimum VS, maximum ILOAD).
Is LM4051AEM3-1.2+T suitable for automotive applications?
While the base LM4051AEM3-1.2+T is rated for -40°C to +125°C, Analog Devices offers AEC-Q100 qualified variants (e.g., LM4051AEM3-1.2/V+T) with additional stress testing for automotive use. For under-hood or ADAS applications, the /V suffix version is required; the standard LM4051AEM3-1.2+T meets temperature range but lacks formal AEC-Q100 certification.
How does the noise performance of LM4051AEM3-1.2+T compare to other shunt references?
LM4051AEM3-1.2+T delivers 28µVRMS wideband noise (10Hz–10kHz), among the lowest in its class. This is 30% lower than the MAX6002EUR+T (40µVRMS) and half the noise of TLVH431AIDBZR (60µVRMS), directly improving SNR in precision ADC applications such as medical ECG or industrial strain gauge measurements.
LM4051AEM3-1.2+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:
- ±0.1%
- 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:
- SOT-23-3
LM4051AEM3-1.2+T FAQ
1.How can I place an order for LM4051AEM3-1.2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AEM3-1.2+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 LM4051AEM3-1.2+T reliable?
The price and inventory of LM4051AEM3-1.2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AEM3-1.2+T is usually 5 days.
3.What payment methods are accepted for LM4051AEM3-1.2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AEM3-1.2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AEM3-1.2+T?
LM4051AEM3-1.2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AEM3-1.2+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 LM4051AEM3-1.2+T?
For technical support, including LM4051AEM3-1.2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AEM3-1.2+T requirements.
6.How does Aetrix verify that LM4051AEM3-1.2+T is sourced from the original manufacturer or authorized distributors?
All LM4051AEM3-1.2+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 LM4051AEM3-1.2+T meets industry standards.
7.What is the process for return or replacement of LM4051AEM3-1.2+T?
All LM4051AEM3-1.2+T units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AEM3-1.2+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 LM4051AEM3-1.2+T part is unused and in its original packaging.
Return procedure for LM4051AEM3-1.2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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