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Texas Instruments LM4051AIM3-ADJ/NOPB
- Part No.:
- LM4051AIM3-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051AIM3-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,890
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Product details
Overview
LM4051AIM3-ADJ/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering an adjustable 1.24 V to 10 V output 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 requires no output capacitor - used in high-accuracy ADC references and portable battery-powered instrumentation.
For engineers reviewing the LM4051AIM3-ADJ/NOPB datasheet, LM4051AIM3-ADJ/NOPB pinout, LM4051AIM3-ADJ/NOPB application, or LM4051AIM3-ADJ/NOPB equivalent, key selection criteria include its adjustable output range, ultra-low quiescent current, capacitive-load stability, and guaranteed tempco performance over extended industrial temperature range.
Technical Context
The LM4051AIM3-ADJ/NOPB functions as a curvature-corrected bandgap shunt reference with internal 1.212 V reference core. Its feedback architecture uses external resistive divider (R1/R2) between cathode and anode to set output voltage, where VOUT = VREF × (1 + R1/R2), and VREF varies slightly with output voltage (−1.69 mV/V typical).
It operates in closed-loop shunt regulation mode: current through the cathode adjusts dynamically to maintain constant voltage at the reference pin. Minimum operating current is 60 μA (industrial range), and dynamic output impedance is 0.3 Ω at 120 Hz (VOUT = VREF), rising to 2 Ω at 10 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external resistor divider; enables flexible system-level voltage scaling without changing reference IC. |
| Initial Accuracy (A Grade) | ±1.2 mV at 100 μA - translates to ±0.1% of 1.225 V nominal reference, enabling 16-bit ADC biasing without trimming. |
| Tempco (−40°C to +125°C) | ±50 ppm/°C maximum - ensures ≤±0.062% output drift over full range, critical for precision sensor front-ends. |
| Wideband Noise (10 Hz–10 kHz) | 20 μVrms - low enough to avoid degrading SNR in 24-bit delta-sigma ADCs when used as reference. |
| Operating Current Range | 60 μA to 12 mA - supports ultra-low-power sleep modes and high-current load regulation in same device. |
| Dynamic Output Impedance | 0.3 Ω at VOUT = VREF, 120 Hz - ensures stable regulation under fast load transients in precision DAC buffers. |
| Capacitive Load Tolerance | Stable with any capacitive load - eliminates need for output bypass capacitor, reducing BOM count and PCB area. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount, lead-free (NOPB suffix). Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Reference (FB) - Pin 3 is functional only in ADJ version and must be connected to external feedback network.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink return path | Connected to system ground; completes shunt current path when cathode is biased above reference voltage. |
| Cathode (Pin 2) | Regulated output node | Delivers adjustable output voltage; carries total current (load + reference); trace width must support up to 12 mA. |
| Reference (Pin 3) | Feedback input | Connects to voltage divider midpoint; senses fraction of cathode voltage to close regulation loop; draws only 70–130 nA. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables zero-component reference design in space-constrained layouts (e.g., wearables, sensor nodes). |
| Tolerates any capacitive load | Eliminates stability analysis overhead; allows direct connection to ADC input caps or LDO bypass networks. |
| Adjustable 1.24–10 V output | Supports single-BOM strategy across multiple voltage rails (e.g., 2.5 V, 3.3 V, 5 V) using same footprint. |
| 60 μA minimum operating current | Extends battery life in always-on monitoring systems (e.g., gas sensors, medical patch devices). |
| 50 ppm/°C max tempco (−40°C to +125°C) | Meets AEC-Q200 Grade 1 requirements for under-hood automotive sensors without external compensation. |
Applications
| Portable Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Handheld multimeter with 24-bit sigma-delta ADC requiring stable 2.5 V reference. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise, low-noise reference voltage to ADC's REF+ pin. Use Value: 20 μVrms noise and ±50 ppm/°C tempco ensure <0.005% measurement error across operating temperature range. |
Use Scenario: Industrial PLC analog input module measuring 4–20 mA sensor signals. IC Role / Device Role / Timing Role: Precision reference for current-to-voltage conversion and ADC biasing in isolated signal chain. Use Value: Adjustable output allows matching of gain-setting resistors to achieve exact 5 V full-scale without calibration. |
| Battery-Powered Medical Devices | Automotive Sensor Interfaces |
Use Scenario: Wearable ECG monitor powered by coin-cell battery with multi-week runtime. IC Role / Device Role / Timing Role: Micropower shunt reference for op-amp biasing and ADC reference in ultra-low-power analog front-end. Use Value: 60 μA min operating current enables operation down to 2.7 V supply while maintaining ±0.1% accuracy. |
Use Scenario: Exhaust gas temperature sensor signal conditioning in engine control unit. IC Role / Device Role / Timing Role: High-stability reference for ratiometric bridge sensing and cold-junction compensation. Use Value: Guaranteed ±50 ppm/°C tempco over −40°C to +125°C eliminates need for software-based thermal correction. |
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 | Fixed 2.495 V output; 2% initial tolerance; higher 0.2 Ω dynamic impedance; requires ≥1 mA cathode current. | Not adjustable; unsuitable for sub-2.4 V or >5 V reference needs; higher power consumption limits battery life. | Select TL431ACDBVR only when fixed 2.5 V output and cost sensitivity outweigh precision and adjustability requirements. |
| MAX6008AEUR+T | Fixed 1.25 V output; ±0.2% initial accuracy; 35 ppm/°C tempco; 50 μA min current; SOT-23-3 pinout compatible. | Lacks adjustability; lower noise (15 μVrms) but narrower output range; not rated for >125°C operation. | Choose MAX6008AEUR+T for space-constrained 1.25 V reference designs where extended temperature range is not required. |
Compared with TL431ACDBVR and MAX6008AEUR+T, LM4051AIM3-ADJ/NOPB uniquely combines adjustable output, ±0.1% A-grade accuracy, and guaranteed 50 ppm/°C tempco over −40°C to +125°C - making it optimal for high-precision, multi-rail, and extended-temperature applications where flexibility and stability are co-prioritized.
Availability
LM4051AIM3-ADJ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and battery-powered medical devices requiring stable component supply with long-term parametric consistency and RoHS-compliant packaging.
Supply support for LM4051AIM3-ADJ/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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, high-accuracy applications including portable test equipment, sensor signal chains, and automotive subsystems requiring extended temperature reliability.
FAQ
What is the minimum operating current for LM4051AIM3-ADJ/NOPB across temperature?
The LM4051AIM3-ADJ/NOPB has a minimum operating current of 60 μA over the industrial temperature range (−40°C to +85°C) and 70 μA over the extended range (−40°C to +125°C), as specified in the Electrical Characteristics table. This ensures reliable regulation even in ultra-low-power sleep states of battery-operated systems. The LM4051AIM3-ADJ/NOPB maintains its ±0.1% initial accuracy and 50 ppm/°C tempco only when operated within this current window.
Can LM4051AIM3-ADJ/NOPB be used without external resistors?
No - the LM4051AIM3-ADJ/NOPB requires an external resistor divider (R1/R2) connected between cathode (Pin 2) and anode (Pin 1), with the midpoint tied to the reference pin (Pin 3), to establish the regulated output voltage. Without this feedback network, the device cannot regulate; it defaults to its internal 1.212 V reference but lacks closed-loop control. The LM4051AIM3-ADJ/NOPB datasheet provides Equation 2 (VOUT = VREF × (1 + R1/R2)) for calculating resistor values.
What is the maximum output voltage achievable with LM4051AIM3-ADJ/NOPB?
The LM4051AIM3-ADJ/NOPB supports a maximum output voltage of 10 V, as defined in the Recommended Operating Conditions table. This limit arises from internal process constraints and absolute maximum ratings - exceeding 10 V risks violating the 15 V maximum output voltage rating and may cause irreversible degradation. For outputs above 10 V, a different reference topology or cascaded configuration is required.
How does LM4051AIM3-ADJ/NOPB handle capacitive loads?
The LM4051AIM3-ADJ/NOPB is explicitly designed to remain stable with any capacitive load - including large bulk capacitors (>10 μF) or ADC input sampling caps - without requiring series resistance or isolation. This is achieved through internal compensation that avoids phase-margin erosion. Unlike many shunt references, the LM4051AIM3-ADJ/NOPB does not oscillate or ring when driving capacitive loads, eliminating the need for output filtering in most applications.
Is LM4051AIM3-ADJ/NOPB pin-compatible with LM4051AIM3-1.2/NOPB?
Yes - both LM4051AIM3-ADJ/NOPB and LM4051AIM3-1.2/NOPB use identical SOT-23-3 (DBZ) packages with identical pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Reference (FB). However, functionality differs: the -1.2 variant has internal feedback and requires Pin 3 to be left floating or tied to Pin 2, whereas the -ADJ variant requires Pin 3 to be actively connected to the external resistor divider. PCB layout can be shared, but schematic and BOM must reflect the correct variant.
LM4051AIM3-ADJ/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:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- 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
LM4051AIM3-ADJ/NOPB FAQ
1.How can I place an order for LM4051AIM3-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051AIM3-ADJ/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 LM4051AIM3-ADJ/NOPB reliable?
The price and inventory of LM4051AIM3-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051AIM3-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051AIM3-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051AIM3-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051AIM3-ADJ/NOPB?
LM4051AIM3-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051AIM3-ADJ/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 LM4051AIM3-ADJ/NOPB?
For technical support, including LM4051AIM3-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051AIM3-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051AIM3-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051AIM3-ADJ/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 LM4051AIM3-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051AIM3-ADJ/NOPB?
All LM4051AIM3-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051AIM3-ADJ/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 LM4051AIM3-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051AIM3-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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