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Texas Instruments LM4051CIM3X-ADJ/NOPB
- Part No.:
- LM4051CIM3X-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3X-ADJ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,995
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Product details
Overview
LM4051CIM3X-ADJ/NOPB from Texas Instruments is a precision micropower shunt voltage reference in SOT-23-3 package, delivering adjustable 1.24 V to 10 V output with ±0.1% initial tolerance (A-grade), 20 μVrms 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 LM4051CIM3X-ADJ/NOPB datasheet, LM4051CIM3X-ADJ/NOPB pinout, LM4051CIM3X-ADJ/NOPB application, or LM4051CIM3X-ADJ/NOPB equivalent, key selection considerations include its adjustable output range, ultra-low quiescent current, capacitor-free stability, thermal hysteresis of 0.3 mV/V, and feedback current of 70–130 nA - all critical for high-accuracy analog front-ends and portable energy management systems.
Technical Context
The LM4051CIM3X-ADJ/NOPB functions as a curvature-corrected bandgap shunt reference with internal amplifier-based feedback control. Its adjustable output is set via external resistor divider between cathode and anode, referenced to the FB pin, enabling precise voltage regulation independent of load current variations.
It operates in closed-loop shunt mode, sinking variable current to maintain constant cathode voltage. The device exhibits no minimum output capacitance requirement, tolerates arbitrary capacitive loads, and maintains stability over full operating current (60 μA–12 mA) and temperature (−40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external R1/R2 divider; supports flexible system-level voltage scaling. |
| Initial Tolerance (A-grade) | ±0.1% at 25°C - ensures high absolute accuracy without post-manufacturing calibration. |
| Tempco (max) | 50 ppm/°C (−40°C to +125°C) - guarantees ≤±5.2 mV total drift over industrial range for 1.225 V nominal reference. |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - low enough for 16-bit+ ADC reference and precision sensor signal chains. |
| Operating Current | 60 μA to 12 mA - enables operation from micro-power sensors to moderate-current analog circuits. |
| Feedback Current | 70–130 nA - minimal loading on feedback network, preserving resistor-divider accuracy. |
| Dynamic Output Impedance | 0.3 Ω at 120 Hz (VOUT = VREF) - ensures tight regulation under dynamic load transients. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Common return path; must be connected to system ground or low-impedance reference plane. |
| Cathode (Pin 1) | Shunt current input / regulated output | Primary output terminal; sinks current to maintain programmed VOUT; connects to RS and load. |
| FB (Pin 3) | Feedback input | High-impedance reference sense point; ties to R1–R2 junction to close regulation loop; must not be left floating. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-limited PCBs without stability-compromising bypass components. |
| Tolerates capacitive loads | Supports direct connection to ADC input caps, filter networks, or long traces without oscillation risk. |
| Adjustable 1.24–10 V output | Allows single BOM part to serve multiple voltage rails (e.g., 2.5 V, 3.3 V, 5 V) via resistor selection. |
| 60 μA min operating current | Permits use in ultra-low-power wake-up circuits and energy-harvesting systems with microamp bias budgets. |
| 50 ppm/°C tempco (guaranteed) | Meets stringent drift requirements for industrial process control and medical diagnostics over full temp range. |
Applications
| Portable Data Acquisition | Precision Battery Monitoring |
|---|---|
Use Scenario: Handheld multimeter or IoT sensor node measuring temperature, pressure, or voltage with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V or 4.096 V reference for ADC conversion and sensor excitation. Use Value: 20 μVrms noise and ±0.1% tolerance enable <1 LSB error at 16-bit resolution without calibration. |
Use Scenario: Li-ion battery fuel gauge in wearables or medical patches monitoring cell voltage and charge state. IC Role / Device Role / Timing Role: Adjustable reference setting precise 3.6 V or 4.2 V overvoltage/undervoltage thresholds for protection circuitry. Use Value: Programmable output and 60 μA operating current extend battery life while maintaining ±5 mV threshold accuracy over temperature. |
| Industrial Process Transmitter | Medical Sensor Signal Conditioning |
Use Scenario: 4–20 mA loop-powered transmitter converting RTD or strain gauge signals in factory automation. IC Role / Device Role / Timing Role: Precision shunt reference establishing stable excitation current and ADC reference in isolated analog front-end. Use Value: 50 ppm/°C tempco and thermal hysteresis ≤0.3 mV/V ensure <0.1% FS error over −40°C to +85°C ambient. |
Use Scenario: ECG or pulse oximetry module requiring low-noise, stable reference for biopotential amplification and digitization. IC Role / Device Role / Timing Role: Low-drift, low-noise reference for PGA gain-setting and ADC reference in analog signal chain. Use Value: 20 μVrms noise and <1.2 mV total drift over medical operating range preserve diagnostic signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | Fixed 2.495 V output; higher 1 mA min cathode current; 22 Ω typical output impedance. | Lacks adjustability; unsuitable for sub-2.4 V or >5 V references; requires external resistors for adjustment. | Choose when fixed 2.5 V reference suffices and lower cost is prioritized over micropower operation. |
| MAX6008AEUR+T | Fixed 1.25 V output; 35 ppm/°C tempco; 15 μVrms noise; SOT-23-3 package. | Not adjustable; tighter noise spec but narrower voltage range; limited to 1.25 V systems. | Prefer when 1.25 V exact reference is needed and lowest possible noise dominates over flexibility. |
Compared with TL431CDBVR and MAX6008AEUR+T, the LM4051CIM3X-ADJ/NOPB uniquely combines wide 1.24–10 V adjustability, 60 μA minimum current, and guaranteed 50 ppm/°C tempco in a single SOT-23-3 footprint - making it optimal for multi-rail, battery-sensitive, and thermally demanding applications where both precision and flexibility are mandatory.
Availability
LM4051CIM3X-ADJ/NOPB is available at Aetrix Electronics and suitable for portable data acquisition, precision battery monitoring, and industrial process transmitters requiring stable component supply with consistent A-grade parametric performance.
Supply support for LM4051CIM3X-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 power management solutions.
The LM4051-N series was designed specifically for high-accuracy, low-power shunt reference applications in space-constrained, battery-operated, and industrial systems - emphasizing micropower operation, capacitor-free stability, and guaranteed temperature performance.
FAQ
What is the minimum operating current for LM4051CIM3X-ADJ/NOPB?
The LM4051CIM3X-ADJ/NOPB requires a minimum operating current of 60 μA across the industrial temperature range (−40°C to +85°C) and 70 μA over the extended range (−40°C to +125°C). This low quiescent current enables use in ultra-low-power applications such as energy-harvesting sensors and always-on monitoring circuits where supply current budgets are tightly constrained. The LM4051CIM3X-ADJ/NOPB remains in regulation only when this current is maintained through the cathode pin.
Can LM4051CIM3X-ADJ/NOPB operate without an output capacitor?
Yes, the LM4051CIM3X-ADJ/NOPB is explicitly designed to operate stably without any output capacitor - a key differentiator from many shunt references. Its internal architecture ensures phase margin across all capacitive loads, including direct connection to ADC input capacitors or long PCB traces. While adding a 0.1 μF ceramic capacitor may reduce high-frequency noise, it is never required for stability. This capability simplifies layout and reduces BOM count in compact designs using the LM4051CIM3X-ADJ/NOPB.
How is the output voltage set for LM4051CIM3X-ADJ/NOPB?
The output voltage of the LM4051CIM3X-ADJ/NOPB is set using an external resistor divider between the cathode (Pin 1) and anode (Pin 2), with the feedback (FB) pin (Pin 3) connected to the midpoint. The nominal relationship is VOUT = VREF × (1 + R1/R2), where VREF = 1.212 V at 100 μA. Due to ∆VREF/∆VO = −1.69 mV/V, higher output voltages slightly reduce VREF, so iterative calculation or TI's reference design tools are recommended for <0.1% accuracy. This configuration enables precise, programmable outputs from 1.24 V to 10 V using the LM4051CIM3X-ADJ/NOPB.
What is the temperature coefficient specification for LM4051CIM3X-ADJ/NOPB?
The LM4051CIM3X-ADJ/NOPB has a guaranteed maximum temperature coefficient of ±50 ppm/°C over the full operating range of −40°C to +125°C for all grades (A/B/C). This means the total output voltage drift due to temperature is bounded - for example, at 5.0 V output, the worst-case drift is ±0.025 V over the full range. The A-grade version achieves this with ±0.1% initial accuracy at 25°C, making the LM4051CIM3X-ADJ/NOPB suitable for applications demanding both high initial precision and robust thermal stability.
Is LM4051CIM3X-ADJ/NOPB pin-compatible with LM4051CIM3-1.2/NOPB?
No, the LM4051CIM3X-ADJ/NOPB and LM4051CIM3-1.2/NOPB share the same SOT-23-3 package and pinout (Anode=Pin2, Cathode=Pin1, FB=Pin3), but their internal configurations differ: the ADJ version requires external feedback via Pin 3, while the 1.2 V version internally connects FB to Anode. Though physically interchangeable, substituting one for the other without circuit modification will result in incorrect or non-regulated output. Always verify feedback network presence and routing before replacement - the LM4051CIM3X-ADJ/NOPB must be used with an external R1/R2 divider.
LM4051CIM3X-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:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051CIM3X-ADJ/NOPB FAQ
1.How can I place an order for LM4051CIM3X-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3X-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 LM4051CIM3X-ADJ/NOPB reliable?
The price and inventory of LM4051CIM3X-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 LM4051CIM3X-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051CIM3X-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3X-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3X-ADJ/NOPB?
LM4051CIM3X-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3X-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 LM4051CIM3X-ADJ/NOPB?
For technical support, including LM4051CIM3X-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3X-ADJ/NOPB requirements.
6.How does Aetrix verify that LM4051CIM3X-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3X-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 LM4051CIM3X-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051CIM3X-ADJ/NOPB?
All LM4051CIM3X-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3X-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 LM4051CIM3X-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM4051CIM3X-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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