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Texas Instruments LM4051AEM3X-1.2/NOPB
- Part No.:
- LM4051AEM3X-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AEM3X-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,220
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Product details
Overview
LM4051AEM3X-1.2/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering a fixed 1.225 V reverse breakdown voltage with ±0.1% initial tolerance (A-grade), 20 μVrms wideband noise (10 Hz–10 kHz), and 50 ppm/°C max temperature coefficient across −40°C to +125°C. It operates from 60 μA to 12 mA and enables stable regulation in space-constrained battery-powered instrumentation.
For engineers reviewing the LM4051AEM3X-1.2/NOPB datasheet, LM4051AEM3X-1.2/NOPB pinout, LM4051AEM3X-1.2/NOPB application, or LM4051AEM3X-1.2/NOPB equivalent, key selection criteria include initial accuracy at 25°C, thermal drift over extended temperature range, minimum operating current for ultra-low-power systems, and stability without output capacitance in portable data acquisition designs.
Technical Context
The LM4051AEM3X-1.2/NOPB implements a curvature-corrected bandgap shunt reference architecture with internal fuse and zener-zap voltage trimming, ensuring ±0.1% accuracy at 25°C. Its design eliminates need for external stabilization capacitors while maintaining stability with any capacitive load.
It functions as a two-terminal shunt device: cathode regulates voltage relative to anode (ground), with feedback internalized for fixed 1.225 V operation. The SOT-23-3 package uses pin 2 as cathode, pin 1 as anode, and pin 3 as NC (must float or connect to pin 2), enabling direct integration into compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage - sets precise reference point for ADCs, DACs, and comparators without external resistors. |
| Initial Tolerance | ±0.1% at 25°C (A-grade) - ensures high-accuracy calibration in medical sensors and portable test equipment without post-fabrication trimming. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - guarantees ≤±5.2 mV total drift over industrial range, critical for automotive and energy metering applications. |
| Noise (10 Hz–10 kHz) | 20 μVrms - minimizes quantization error in 16-bit+ data acquisition systems where reference noise dominates system ENOB. |
| Operating Current | 60 μA to 12 mA - supports micropower sleep modes (<100 μA) while sustaining full regulation during active measurement bursts. |
| Dynamic Impedance | 0.5 Ω at 1 mA, 120 Hz - maintains tight voltage regulation under fast load transients in precision current sources and clamping circuits. |
| Long-Term Stability | 120 ppm (1000 hrs at 25°C) - ensures consistent performance over product lifetime in unattended industrial monitoring nodes. |
Pinout & Package
SOT-23-3 package (3.00 mm × 1.30 mm), surface-mount, tape-and-reel packaging. Pin 3 is not internally connected and must be left floating or tied to pin 2 per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Connected to system ground; serves as return path for shunt current and defines voltage reference baseline. |
| Cathode (Pin 2) | Regulated output terminal | Delivers stable 1.225 V when reverse-biased; sinks variable current to maintain voltage under varying load/supply conditions. |
| NC (Pin 3) | No-connect terminal | Must remain unconnected or shorted to pin 2; no internal die connection - avoids parasitic leakage paths in high-impedance bias networks. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with zero output capacitance - eliminates BOM cost and board area for decoupling in wearables and implantable devices. |
| Tolerates capacitive loads | Remains stable with >100 nF output capacitance - supports filtering in noisy environments without risk of oscillation. |
| Low quiescent current | 60 μA minimum operating current - enables multi-year battery life in IoT sensor nodes powered by coin cells. |
| Wide temperature range | Specified from −40°C to +125°C - qualified for under-hood automotive modules and industrial motor drives without derating. |
| High ESD robustness | ±2000 V HBM - withstands handling in automated assembly lines and field service without protection diodes. |
Applications
| Portable Data Loggers | Battery Management Systems |
|---|---|
Use Scenario: Continuous low-power voltage monitoring of Li-ion cell voltages in remote environmental sensors. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V for 16-bit SAR ADC conversion, referenced against battery voltage via resistor divider. Use Value: Enables ±0.5 mV absolute voltage measurement accuracy over −25°C to +70°C, meeting IEC 62304 Class C software requirements. |
Use Scenario: Cell balancing circuitry in 4S lithium-polymer packs for power tools. IC Role / Device Role / Timing Role: Precision clamp reference for op-amp comparator thresholds detecting overvoltage on individual cells. Use Value: 50 ppm/°C tempco ensures <±2 mV threshold shift across operating temperature, preventing false trip during rapid discharge. |
| Medical Pulse Oximeters | Industrial Process Transmitters |
Use Scenario: Dual-wavelength LED driver biasing and photodiode signal conditioning in wearable SpO₂ monitors. IC Role / Device Role / Timing Role: Reference for transimpedance amplifier gain setting and ADC full-scale calibration. Use Value: 20 μVrms noise contributes <0.01% of total system noise floor, preserving signal integrity for sub-1% saturation resolution. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with HART modulation capability. IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor Wheatstone networks and analog front-end ADC reference. Use Value: 120 ppm long-term stability ensures <±0.1% span drift over 5 years, eliminating annual recalibration in hazardous-area installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 50 ppm/°C tempco, 50 μA min current, SOT-23-3 | Higher minimum current (50 μA vs 60 μA) but lower noise (12 μVrms) and tighter long-term drift (50 ppm vs 120 ppm) | Preferred for ultra-low-noise precision instrumentation where supply headroom allows higher bias current. |
| ADR3412ARJZ-R7 | 1.2 V output, ±0.1% initial tolerance, 30 ppm/°C tempco, 100 μA min current, SOT-23-5 | Lower tempco and same initial accuracy, but requires 100 μA min current and 5-pin package with separate ground and output pins | Selected when superior thermal stability is mandatory and PCB layout accommodates 5-pin footprint and dedicated ground path. |
Compared with REF3012AIDBZR and ADR3412ARJZ-R7, the LM4051AEM3X-1.2/NOPB offers the lowest minimum operating current for battery longevity, while trading off slightly higher noise and long-term drift - making it optimal for cost-sensitive, space-constrained, and ultra-low-power applications where 20 μVrms noise is acceptable.
Availability
LM4051AEM3X-1.2/NOPB is available at Aetrix Electronics and suitable for portable data loggers, battery management systems, medical pulse oximeters, and industrial process transmitters requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM4051AEM3X-1.2/NOPB 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.
The LM4051-N series was developed specifically for micropower, space-constrained shunt reference applications - targeting portable instrumentation, battery-powered sensors, and high-accuracy analog signal chains where minimal board area and ultra-low quiescent current are essential.
FAQ
What is the maximum operating current for LM4051AEM3X-1.2/NOPB?
The LM4051AEM3X-1.2/NOPB supports a maximum operating current of 12 mA. This limit ensures safe power dissipation within the SOT-23-3 package's thermal constraints (280 mW at 25°C ambient). Exceeding 12 mA risks exceeding the absolute maximum reverse current rating and may cause permanent degradation of the reference voltage accuracy or junction overheating.
Does LM4051AEM3X-1.2/NOPB require an external output capacitor?
No, the LM4051AEM3X-1.2/NOPB does not require an external output capacitor for stability. Its internal architecture is designed to remain unconditionally stable with zero output capacitance and tolerates capacitive loads up to 100 nF without oscillation. Adding an output capacitor is optional and used only for additional noise filtering in sensitive analog circuits.
What is the temperature coefficient specification for LM4051AEM3X-1.2/NOPB?
The LM4051AEM3X-1.2/NOPB has a guaranteed maximum temperature coefficient of 50 ppm/°C over the full −40°C to +125°C range. This means its output voltage drift is bounded by ±5.2 mV over the industrial temperature range (−40°C to +85°C) and ±6.5 mV over the extended range, calculated from the 1.225 V nominal output and specified tempco.
How is pin 3 used on the LM4051AEM3X-1.2/NOPB SOT-23 package?
Pin 3 of the LM4051AEM3X-1.2/NOPB is a no-connect (NC) terminal with no internal die connection. Per Texas Instruments' datasheet, it must either be left floating or connected directly to pin 2 (cathode). Connecting pin 3 to any other net - including ground or supply - violates the device's electrical specification and may introduce leakage paths or measurement errors in high-impedance reference circuits.
What grade does the 'A' in LM4051AEM3X-1.2/NOPB indicate?
The 'A' in LM4051AEM3X-1.2/NOPB denotes the A-grade version, which guarantees ±0.1% initial output voltage tolerance at 25°C. This grade also meets the same 50 ppm/°C temperature coefficient and 120 ppm long-term stability specifications as B- and C-grade variants, but with tighter initial accuracy - making it suitable for applications requiring factory calibration without post-production adjustment.
LM4051AEM3X-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- 12 mA
- Tolerance:
- ±0.1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 65 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051AEM3X-1.2/NOPB FAQ
1.How can I place an order for LM4051AEM3X-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AEM3X-1.2/NOPB 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 LM4051AEM3X-1.2/NOPB reliable?
The price and inventory of LM4051AEM3X-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AEM3X-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051AEM3X-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AEM3X-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AEM3X-1.2/NOPB?
LM4051AEM3X-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AEM3X-1.2/NOPB 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 LM4051AEM3X-1.2/NOPB?
For technical support, including LM4051AEM3X-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AEM3X-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051AEM3X-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051AEM3X-1.2/NOPB 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 LM4051AEM3X-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051AEM3X-1.2/NOPB?
All LM4051AEM3X-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AEM3X-1.2/NOPB, 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 LM4051AEM3X-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051AEM3X-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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