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Texas Instruments LM4051AIM3X-1.2/NOPB
- Part No.:
- LM4051AIM3X-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AIM3X-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,320
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Product details
Overview
LM4051AIM3X-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, enabling use in low-power analog sensing and battery-backed data acquisition.
For engineers reviewing the LM4051AIM3X-1.2/NOPB datasheet, LM4051AIM3X-1.2/NOPB pinout, LM4051AIM3X-1.2/NOPB application, or LM4051AIM3X-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 space-constrained layouts.
Technical Context
The LM4051AIM3X-1.2/NOPB implements a curvature-corrected bandgap shunt reference architecture, functioning as a two-terminal device where cathode regulates voltage by sinking variable current to maintain 1.225 V across its terminals. Its internal fuse and zener-zap trimming ensures ±0.1% initial accuracy at 25°C for A-grade units.
It requires no external stabilization capacitor and remains stable with any capacitive load-enabling direct integration into high-impedance feedback networks and low-noise sensor biasing circuits. 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), with die-attach path defining the negative output node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V nominal reverse breakdown voltage - sets precise bias point for ADC references and sensor excitation. |
| Initial Tolerance | ±0.1% at 25°C (A grade) - enables single-point calibration in portable instrumentation without trim potentiometers. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - ensures <±5.2 mV total drift over industrial range, critical for field-deployed sensors. |
| Operating Current | 60 μA to 12 mA - supports nanoamp-level standby modes while sustaining regulation under transient loads. |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - minimizes contribution to system noise floor in 16-bit+ data acquisition front-ends. |
| Dynamic Impedance | 0.5 Ω at 1 mA, 120 Hz - provides low AC impedance for fast transient response in closed-loop regulators. |
| Long-Term Stability | 120 ppm over 1000 hrs - ensures reference integrity in medical and energy metering applications requiring >10-year calibration intervals. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount compatible with standard reflow profiles. Pin 3 is internally connected to the die's negative terminal via die attach; for LM4051-1.2 variants, it must be left floating or tied to pin 2 (cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference input / current source node | Connects to series resistor (RS) from supply; defines shunt current path into device. |
| Cathode (Pin 2) | Regulated output / voltage sense node | Provides stable 1.225 V relative to anode; serves as precision voltage source for feedback or biasing. |
| NC (Pin 3) | Die-attach ground reference | Must float or connect to pin 2; not electrically isolated-ties internal substrate to cathode potential. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct placement in high-impedance nodes (e.g., op-amp non-inverting inputs) without stability risk or board area penalty. |
| Tolerates capacitive loads | Supports direct connection to ADC input caps or long PCB traces without oscillation-critical for modular sensor designs. |
| 60 μA minimum operating current | Permits operation from coin cells or energy-harvesting sources where quiescent current dominates system budget. |
| Reverse breakdown voltage option | Fixed 1.225 V variant eliminates external resistor network needed for adjustable versions-reducing BOM count and layout complexity. |
| 50 ppm/°C tempco guarantee | Ensures predictable error envelope across automotive under-hood or industrial ambient conditions without derating. |
Applications
| Portable Data Loggers | Medical Sensor Front-Ends |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and gas concentration at 1-sample-per-minute intervals. IC Role / Device Role / Timing Role: Shunt reference providing excitation voltage for resistive sensors and reference voltage for 16-bit SAR ADC. Use Value: 60 μA min operating current extends coin-cell life beyond 5 years; 20 μVrms noise preserves effective resolution in low-frequency measurements. |
Use Scenario: Wearable ECG patch measuring microvolt-level cardiac signals with onboard analog front-end and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Precision bias source for instrumentation amplifier gain-setting resistors and ADC reference rail. Use Value: ±0.1% initial tolerance eliminates factory calibration step; 50 ppm/°C tempco maintains diagnostic accuracy across skin-contact temperature variations. |
| Industrial Process Transmitters | Energy Metering IC Biasing |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in oil & gas refineries with ambient temperatures from −40°C to +85°C. IC Role / Device Role / Timing Role: Stable voltage reference for DAC output scaling and sensor signal conditioning circuitry. Use Value: Guaranteed 50 ppm/°C drift over full industrial range ensures <±0.1% total error contribution to 0.1% accuracy transmitters. |
Use Scenario: Polyphase electricity meter using metrology ICs (e.g., ADE7953) requiring clean, stable reference for RMS and harmonic calculations. IC Role / Device Role / Timing Role: Primary reference for metrology ADC and auxiliary analog blocks (e.g., voltage monitoring comparators). Use Value: 120 ppm long-term stability meets IEC 62053-21 Class 0.2 requirements for 10-year field deployment without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495 V nominal output, ±1% initial tolerance, higher 60 μA min current, 0.22 Ω dynamic impedance | Requires external resistor divider for 1.225 V; less suitable for ultra-low-power or noise-sensitive designs | Select when cost sensitivity outweighs precision and power constraints; verify loop stability with target capacitive load. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 3.5 μVrms noise, 50 ppm/°C tempco, but 50 μA min current and 3-pin SOT-23-3 with dedicated GND | Series reference topology-requires load current path to ground, incompatible with shunt-based topologies | Choose only for new designs where series configuration simplifies supply sequencing; not drop-in for LM4051-1.2 shunt placements. |
Compared with TL431ACDBVR and REF3012AIDBZR, the LM4051AIM3X-1.2/NOPB uniquely combines sub-100 μA operation, true shunt topology, and 1.225 V fixed output in a 3-pin SOT-23-making it irreplaceable in battery-life-critical, two-terminal biasing, and low-noise analog signal chains where layout simplicity and minimal external components are mandatory.
Availability
LM4051AIM3X-1.2/NOPB is available at Aetrix Electronics and suitable for portable data loggers, medical sensor front-ends, and industrial process transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM4051AIM3X-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 and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM4051-N product line delivers precision micropower shunt references optimized for space-constrained, battery-operated, and high-accuracy measurement systems-addressing demand for stable voltage references with zero external capacitance requirements.
FAQ
What is the maximum operating current for LM4051AIM3X-1.2/NOPB?
The LM4051AIM3X-1.2/NOPB supports a maximum operating current of 12 mA. This upper limit ensures safe power dissipation within the SOT-23-3 package at ambient temperatures up to +85°C. Exceeding 12 mA risks thermal overload and permanent damage, especially under high ambient conditions or poor PCB copper pour. Always verify worst-case current using the series resistor (RS) value, supply voltage range, and minimum load current in your design before finalizing the LM4051AIM3X-1.2/NOPB implementation.
Does LM4051AIM3X-1.2/NOPB require an output capacitor for stability?
No, the LM4051AIM3X-1.2/NOPB does not require an output capacitor for stability-it is designed to remain unconditionally stable with any capacitive load, including direct connection to ADC input capacitors or long PCB traces. This eliminates board area, cost, and reliability concerns associated with external capacitors. However, an input bypass capacitor (e.g., 0.1 µF ceramic) is recommended to suppress supply noise that could modulate the reference output. The LM4051AIM3X-1.2/NOPB's internal architecture inherently rejects such noise above ~100 kHz.
What is the temperature coefficient specification for LM4051AIM3X-1.2/NOPB?
The LM4051AIM3X-1.2/NOPB has a guaranteed maximum temperature coefficient of 50 ppm/°C over the full operating range of −40°C to +125°C. This means the 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 (−40°C to +125°C), assuming ±0.1% initial tolerance at 25°C. This spec is verified per Statistical Quality Control (SQC) methods and applies to all A-grade devices, including the LM4051AIM3X-1.2/NOPB part number.
Can LM4051AIM3X-1.2/NOPB be used in place of LM4051AIM3-1.2/NOPB?
Yes, LM4051AIM3X-1.2/NOPB is the tape-and-reel version of the same device as LM4051AIM3-1.2/NOPB (cut-tape), sharing identical electrical specifications, SOT-23-3 package dimensions, pinout, and performance characteristics. The "X" suffix denotes bulk packaging format for automated assembly, while the base part number without "X" refers to cut-tape. Both are manufactured to the same SNOS491D datasheet revision and undergo identical wafer sort trimming and final test. No design changes or validation are required when substituting LM4051AIM3X-1.2/NOPB for LM4051AIM3-1.2/NOPB in production.
What is the role of Pin 3 on LM4051AIM3X-1.2/NOPB?
Pin 3 of the LM4051AIM3X-1.2/NOPB is labeled NC (No Connect) but is internally connected to the die's substrate via the die-attach material-effectively tying it to the cathode potential. Per TI's datasheet, Pin 3 must either be left floating or connected directly to Pin 2 (cathode); it must never be connected to ground or any other potential. Incorrect connection violates the device's internal biasing and may cause regulation failure or excessive drift. This mechanical tie ensures consistent thermal and electrical reference behavior across the SOT-23-3 package.
LM4051AIM3X-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:
- Active
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051AIM3X-1.2/NOPB FAQ
1.How can I place an order for LM4051AIM3X-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIM3X-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 LM4051AIM3X-1.2/NOPB reliable?
The price and inventory of LM4051AIM3X-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 LM4051AIM3X-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051AIM3X-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIM3X-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIM3X-1.2/NOPB?
LM4051AIM3X-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIM3X-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 LM4051AIM3X-1.2/NOPB?
For technical support, including LM4051AIM3X-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIM3X-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051AIM3X-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051AIM3X-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 LM4051AIM3X-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051AIM3X-1.2/NOPB?
All LM4051AIM3X-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIM3X-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 LM4051AIM3X-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051AIM3X-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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