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Texas Instruments LM4051AEM3-1.2
- Part No.:
- LM4051AEM3-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AEM3-1.2.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,288
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Product details
Overview
LM4051AEM3-1.2 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), 50 ppm/°C max temperature coefficient, and 20 μVrms (10 Hz–10 kHz) output noise - used for high-accuracy biasing and regulation in low-power analog signal chains.
For engineers reviewing the LM4051AEM3-1.2 datasheet, LM4051AEM3-1.2 pinout, LM4051AEM3-1.2 application, or LM4051AEM3-1.2 equivalent, key selection criteria include operating current range (60 μA to 12 mA), industrial/extended temperature support (−40°C to +125°C), no-output-capacitor stability, and cathode-anode terminal behavior in shunt regulator topologies.
Technical Context
The LM4051AEM3-1.2 functions as a curvature-corrected bandgap shunt reference, regulating by sinking variable current through its cathode to maintain a stable 1.225 V across anode-to-cathode terminals. Its internal fuse and zener-zap trimming ensures ±0.1% accuracy at 25°C, and it operates without external stabilization capacitance while remaining stable under capacitive loads.
It requires only a series current-setting resistor (RS) between supply and cathode, with minimum operating current of 60 μA (industrial range) and maximum of 12 mA. The device exhibits 0.5 Ω dynamic impedance at 120 Hz and thermal hysteresis of 0.36 mV/V over −40°C to +125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V fixed reverse breakdown voltage - sets precise reference point for ADCs, DACs, and comparators. |
| Initial Tolerance | ±0.1% at 25°C (A grade) - enables single-point calibration in portable instrumentation without trim. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - ensures ≤±5.2 mV total drift over full extended temperature range. |
| Output Noise | 20 μVrms, 10 Hz–10 kHz - supports 16-bit+ resolution in battery-powered data acquisition systems. |
| Operating Current | 60 μA to 12 mA - allows ultra-low-power operation (e.g., 3.3 V supply with 54 kΩ RS) and robust load regulation. |
| Dynamic Impedance | 0.5 Ω at 120 Hz - minimizes output voltage shift under dynamic load transients in precision sensor interfaces. |
| Long-Term Stability | 120 ppm (1000 hrs at 25°C) - reduces recalibration frequency in medical and industrial monitoring equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm, surface-mount, tape-and-reel compatible. Pin 3 is NC (must float or connect to pin 2); pin 1 = anode; pin 2 = cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Connected to system ground or low-impedance return path; defines voltage reference point for cathode output. |
| Cathode (Pin 2) | Shunt current sink / output | Sinks adjustable current to maintain 1.225 V across anode–cathode; connects to RS and load node in shunt topology. |
| NC (Pin 3) | No-connect terminal | Must be left floating or tied to pin 2 (anode); not internally bonded in LM4051-1.2 variant per TI DBZ package spec. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables space-constrained PCB layouts (e.g., wearables) without compromising stability under 10 nF–10 μF capacitive loads. |
| 60 μA minimum operating current | Supports operation from coin-cell batteries (e.g., CR2032) with >10-year shelf life in always-on sensor nodes. |
| Reverse breakdown voltage option | Fixed 1.225 V output eliminates external feedback resistors - simplifies design vs. adjustable variants like LM4051-ADJ. |
| 50 ppm/°C tempco guarantee | Meets Class A accuracy requirements for industrial process controllers operating across −40°C to +85°C ambient. |
| 20 μVrms wideband noise | Permits direct coupling to 16-bit SAR ADCs (e.g., ADS8860) without additional filtering in portable DMMs. |
Applications
| Portable Data Loggers | Medical Sensor Front-Ends |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure at 1-sample/sec intervals. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225 V for ADC reference input and op-amp biasing. Use Value: Enables <1 μA quiescent system sleep current while maintaining ±0.1% measurement accuracy over 0–50°C operating range. | Use Scenario: Disposable ECG patch with integrated analog front-end and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Precision reference for instrumentation amplifier gain-setting and ADC conversion reference. Use Value: Delivers 20 μVrms noise floor and 120 ppm long-term stability - critical for detecting microvolt-level ST-segment shifts. |
| Industrial Current Loop Transmitters | Energy Meter Reference Subsystem |
Use Scenario: 4–20 mA loop-powered transmitter measuring flow rate in hazardous-area oil & gas installations. IC Role / Device Role / Timing Role: Fixed-voltage shunt reference establishing accurate I/V conversion ratio for DAC-controlled loop current. Use Value: 50 ppm/°C tempco and −40°C to +125°C rating ensure ±0.05% full-scale error across harsh ambient conditions. | Use Scenario: DIN-rail mounted kWh meter with metrology-grade polyphase energy measurement ASIC. IC Role / Device Role / Timing Role: Primary reference for 24-bit delta-sigma ADCs sampling voltage and current channels simultaneously. Use Value: 0.5 Ω dynamic impedance prevents reference droop during fast current transients (e.g., motor startup), preserving active/reactive power accuracy. |
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, 3.5 μA quiescent current - higher accuracy but lower max current (25 mA). | Optimized for ultra-low-power IoT sensors; lacks 12 mA drive capability needed for high-side current sensing. | Select REF3012AIDBZR when sub-μA sleep current dominates over load regulation performance. |
| ADR3412ARJZ-R7 | 1.2 V output, ±0.1% initial tolerance, 30 ppm/°C tempco, 120 μA quiescent - tighter tempco but higher min current (120 μA). | Better for high-precision lab equipment; unsuitable for coin-cell applications requiring <100 μA startup. | Choose ADR3412ARJZ-R7 where long-term stability (<50 ppm/1000 hrs) and lower tempco outweigh micropower needs. |
Compared with REF3012AIDBZR and ADR3412ARJZ-R7, the LM4051AEM3-1.2 uniquely balances ultra-low 60 μA minimum current, 12 mA sink capability, and SOT-23 footprint - making it optimal for cost-sensitive, battery-operated industrial transmitters where both micropower startup and robust load regulation are required.
Availability
LM4051AEM3-1.2 is available at Aetrix Electronics and suitable for portable data loggers, medical sensor front-ends, industrial current loop transmitters, and energy meter reference subsystems requiring stable component supply across automotive, industrial, and medical production programs.
Supply support for LM4051AEM3-1.2 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 product line delivers precision micropower shunt references optimized for space-constrained, battery-powered systems requiring high initial accuracy, low noise, and guaranteed temperature stability - targeting instrumentation, portable medical devices, and smart sensors.
FAQ
What is the maximum operating current for LM4051AEM3-1.2?
The LM4051AEM3-1.2 supports a maximum operating current of 12 mA. This limit ensures safe power dissipation within the SOT-23 package's 280 mW rating at 25°C ambient. Exceeding 12 mA risks thermal overload and long-term reliability degradation. Designers must size the series resistor RS to constrain cathode current within 60 μA–12 mA across all supply and load conditions. The LM4051AEM3-1.2 datasheet specifies this value in Section 6.3 (Recommended Operating Conditions).
Does LM4051AEM3-1.2 require an external output capacitor?
No, the LM4051AEM3-1.2 does not require an external output capacitor for stability. Its advanced curvature-corrected bandgap architecture ensures unconditional stability with capacitive loads up to 10 μF, eliminating layout constraints common with older shunt references. While optional bypass capacitors (e.g., 0.1 μF ceramic) can reduce high-frequency noise, they are not necessary for regulation integrity. This feature is explicitly confirmed in the "Features" section and "Detailed Description" of the LM4051AEM3-1.2 datasheet.
What is the temperature coefficient specification for LM4051AEM3-1.2?
The LM4051AEM3-1.2 has a guaranteed maximum temperature coefficient of 50 ppm/°C over the extended temperature range of −40°C to +125°C. This means the output voltage drift remains within ±5.2 mV (±0.425% of 1.225 V) across that full range for A-grade units. The parameter is production-tested and specified in Section 6.5 (LM4051-1.2 Electrical Characteristics) of the LM4051AEM3-1.2 datasheet, with test conditions defined at IR = 100 μA.
How is pin 3 configured on the LM4051AEM3-1.2 SOT-23 package?
Pin 3 of the LM4051AEM3-1.2 is a no-connect (NC) terminal. Per TI's DBZ package documentation and Pin Configuration diagram, it must either be left floating or connected to pin 2 (cathode). This differs from the LM4051-ADJ variant, where pin 3 serves as the feedback (FB) input. The NC configuration simplifies layout for fixed-voltage applications and avoids unintended feedback paths. This pin behavior is documented in Section 5 ("Pin Configuration and Functions") of the LM4051AEM3-1.2 datasheet.
What is the typical output noise of LM4051AEM3-1.2?
The LM4051AEM3-1.2 delivers 20 μVrms wideband noise over the 10 Hz to 10 kHz frequency range, measured at IR = 100 μA. This low-noise performance enables direct use with high-resolution ADCs (e.g., 16-bit SAR or 24-bit delta-sigma) without additional filtering. The value is specified in Section 6.5 ("LM4051-1.2 Electrical Characteristics") and verified in Figure 3 ("Noise Voltage") of the LM4051AEM3-1.2 datasheet, supporting precision measurement applications like portable DMMs and sensor signal conditioning.
LM4051AEM3-1.2 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
LM4051AEM3-1.2 FAQ
1.How can I place an order for LM4051AEM3-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AEM3-1.2 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 reliable?
The price and inventory of LM4051AEM3-1.2 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 is usually 5 days.
3.What payment methods are accepted for LM4051AEM3-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AEM3-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AEM3-1.2?
LM4051AEM3-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AEM3-1.2 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?
For technical support, including LM4051AEM3-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AEM3-1.2 requirements.
6.How does Aetrix verify that LM4051AEM3-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4051AEM3-1.2 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 meets industry standards.
7.What is the process for return or replacement of LM4051AEM3-1.2?
All LM4051AEM3-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AEM3-1.2, 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 part is unused and in its original packaging.
Return procedure for LM4051AEM3-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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