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Texas Instruments LM4051CIM3-ADJ
- Part No.:
- LM4051CIM3-ADJ
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3-ADJ.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,952
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Product details
Overview
LM4051CIM3-ADJ 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 via external resistor divider, 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 enables stable low-current regulation in space-constrained battery-powered instrumentation.
For engineers reviewing the LM4051CIM3-ADJ datasheet, LM4051CIM3-ADJ pinout, LM4051CIM3-ADJ application, or LM4051CIM3-ADJ equivalent, key selection criteria include minimum operating current (60 μA), dynamic output impedance (0.3 Ω at 1 mA), feedback current (70–130 nA), reverse breakdown voltage adjustability, and SOT-23 thermal performance (RθJA = 214.7°C/W).
Technical Context
The LM4051CIM3-ADJ operates as a curvature-corrected bandgap shunt reference with internal amplifier-based feedback control. Its cathode-anode-reference terminal configuration enables closed-loop regulation using external R1/R2 resistive dividers, where output voltage follows VOUT = VREF × (1 + R1/R2) with VREF = 1.212 V (typ.) at 100 μA and VOUT = 5 V.
It requires no output capacitor for stability but tolerates capacitive loads up to 10 μF. The device enters proper linear regulation only when cathode current exceeds 60 μA (A-grade, industrial range), and its feedback pin draws only 70–130 nA-enabling high-impedance divider networks without significant error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V, set by external R1/R2 ratio; enables flexible system-level voltage scaling without changing reference IC. |
| Initial Tolerance (A-grade) | ±1.2 mV at 100 μA and VOUT = 5 V - supports high-accuracy ADC/DAC biasing in portable test equipment. |
| Tempco (−40°C to +125°C) | ±50 ppm/°C maximum - ensures < ±5.2 mV total drift over full extended temperature range for automotive sensor interfaces. |
| Operating Current Range | 60 μA to 12 mA - allows ultra-low-power operation in energy-harvesting nodes while supporting fast transient response in active clamps. |
| Wideband Noise | 20 μVrms (10 Hz–10 kHz) - minimizes quantization error in 16-bit+ data acquisition systems with low-noise front ends. |
| Dynamic Output Impedance | 0.3 Ω at 1 mA, 120 Hz - provides stiff reference voltage under varying load conditions in precision current sources. |
| Feedback Current | 70–130 nA - permits use of >1 MΩ feedback resistors, reducing power loss and PCB leakage sensitivity in medical analog front ends. |
Pinout & Package
SOT-23-3 (DBZ) package, 3.00 mm × 1.30 mm body size, surface-mount compatible with standard reflow profiles. Pin 3 serves as the anode (−) output terminal for LM4051CIM3-ADJ, distinct from the floating NC pin used in fixed-voltage variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Primary current path; connects to supply rail via series resistor (RS) and sets regulation point via external feedback network. |
| Anode (Pin 3) | Reference ground / output return | Low-impedance common node; must be connected to system ground or load return; not NC in ADJ version. |
| Reference (Pin 2) | Feedback input / voltage divider tap | High-impedance sensing node; connects to mid-point of R1/R2 divider to close regulation loop and enable adjustable output. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation with zero output capacitance simplifies layout and eliminates capacitor aging/reliability concerns in long-life embedded systems. |
| Tolerates capacitive loads | Remains stable with up to 10 μF on cathode or anode-supports direct connection to ADC reference inputs or op-amp feedback paths without isolation resistors. |
| Adjustable reverse breakdown | 1.24 V to 10 V programmability via two-resistor divider enables reuse across multiple voltage rails in multi-sensor modules. |
| Low quiescent current | 60 μA minimum operating current allows integration into sub-100 μA sleep-mode circuits such as wireless sensor transceivers. |
| High-impedance feedback input | 70–130 nA input current enables >1 MΩ feedback networks-reducing power consumption and PCB leakage impact in high-precision medical instrumentation. |
Applications
| Portable Data Loggers | Precision Current Sources |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and gas concentration over weeks on coin-cell power. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V bias for 16-bit SAR ADC and low-drift op-amp signal conditioning. Use Value: 60 μA minimum current and 20 μVrms noise ensure >90 dB SNR and multi-year runtime without compromising measurement resolution. | Use Scenario: Programmable 100 μA–1 mA current source for calibrating photodiode receivers in optical communication modules. IC Role / Device Role / Timing Role: Adjustable shunt reference setting precise compliance voltage for op-amp-controlled MOSFET current sink. Use Value: 1.24–10 V adjustability and 0.3 Ω dynamic impedance maintain <0.01% current error across temperature and load variations. |
| Automotive Cabin Sensors | Medical ECG Front Ends |
Use Scenario: Occupancy and air quality monitoring unit mounted near vehicle HVAC ducts, exposed to −40°C to +125°C ambient swings. IC Role / Device Role / Timing Role: Reference for ratiometric pressure and CO₂ sensor excitation and ADC conversion in ASIL-B subsystems. Use Value: ±50 ppm/°C tempco and ±5.2 mV overtemperature tolerance guarantee <0.1% full-scale error across full automotive temperature range. | Use Scenario: Low-noise analog front end for wearable ECG patch measuring microvolt-level cardiac signals with 120 dB CMRR. IC Role / Device Role / Timing Role: Ultra-low-noise 1.25 V reference for instrumentation amplifier gain-setting and ADC reference in battery-operated clinical devices. Use Value: 20 μVrms noise and 70–130 nA feedback current minimize added noise and offset drift in high-gain, high-impedance biopotential paths. |
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 min current (1 mA); 22 Ω typical ZOUT; no adjustable option. | Requires external resistor divider for non-2.5 V outputs; unsuitable for sub-1 V or >5 V references. | Choose TL431CDBVR only when fixed 2.5 V is sufficient and higher current budget exists. |
| MAX6126AASA+ | Series reference (not shunt); 1.25 V fixed; 3 ppm/°C tempco; 12 μVrms noise; SO-8 package. | Requires input-to-output headroom; incompatible with shunt topology; larger footprint and cost. | Choose MAX6126AASA+ only when lowest noise and tempco are critical and series topology fits the power architecture. |
Compared with TL431CDBVR and MAX6126AASA+, the LM4051CIM3-ADJ uniquely combines adjustable output, micropower operation (60 μA), SOT-23 size, and shunt topology-making it optimal for space- and current-constrained designs requiring flexibility without sacrificing precision.
Availability
LM4051CIM3-ADJ is available at Aetrix Electronics and suitable for portable instrumentation, precision current sources, automotive cabin sensors, and medical ECG front ends requiring stable component supply with guaranteed long-term availability.
Supply support for LM4051CIM3-ADJ 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in precision analog ICs.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems demanding high accuracy, low noise, and wide temperature operation-targeting instrumentation, medical, and automotive sensing.
FAQ
What is the minimum operating current for LM4051CIM3-ADJ across temperature ranges?
The LM4051CIM3-ADJ requires a minimum operating current of 60 μA over the industrial temperature range (−40°C to +85°C) and 65 μA over the extended range (−40°C to +125°C), as specified in the A-grade electrical characteristics table. This current must flow through the cathode to maintain regulation; insufficient current causes output voltage collapse. The LM4051CIM3-ADJ datasheet confirms this value is grade- and temperature-dependent, with C-grade requiring slightly higher minimum current.
How does the feedback pin (Pin 2) function in LM4051CIM3-ADJ circuits?
In the LM4051CIM3-ADJ, Pin 2 is the reference (FB) input that senses a fraction of the cathode voltage via an external R1/R2 divider. The internal amplifier compares this voltage to its 1.212 V bandgap reference and adjusts cathode current to force VFB = VREF, thereby regulating VCATHODE = VREF × (1 + R1/R2). The LM4051CIM3-ADJ draws only 70–130 nA into this pin, enabling high-value resistors without loading error.
Can LM4051CIM3-ADJ operate without any external capacitors?
Yes, the LM4051CIM3-ADJ is designed for unconditional stability with zero external capacitors-neither input nor output bypass caps are required. Its advanced curvature-corrected bandgap architecture eliminates the need for stabilization capacitance, unlike older shunt references. However, TI recommends a 0.1 μF ceramic capacitor on the input to reduce noise coupling; the LM4051CIM3-ADJ remains stable even if one is added.
What is the maximum output voltage achievable with LM4051CIM3-ADJ?
The LM4051CIM3-ADJ supports an output voltage range of 1.24 V to 10 V, as defined in the Recommended Operating Conditions table. This upper limit arises from internal safe-operating-area constraints-not from the reference core itself. Attempting to set VOUT >10 V risks exceeding the 15 V absolute maximum cathode-to-anode voltage rating and may cause parametric shift or reliability degradation per the LM4051CIM3-ADJ datasheet.
How does temperature coefficient affect LM4051CIM3-ADJ accuracy in automotive applications?
The LM4051CIM3-ADJ guarantees ≤±50 ppm/°C tempco from −40°C to +125°C. Over this 165°C span, total drift is bounded by ±50 ppm/°C × 165°C = ±8250 ppm (±0.825%), or ±8.5 mV for a 1.225 V base reference. For a 5 V output, that's ±41.3 mV-well within typical automotive sensor interface tolerances. The LM4051CIM3-ADJ datasheet provides overtemperature tolerance calculations confirming this behavior for A-grade units.
LM4051CIM3-ADJ 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:
- Not For New Designs
- 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
LM4051CIM3-ADJ FAQ
1.How can I place an order for LM4051CIM3-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3-ADJ 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 LM4051CIM3-ADJ reliable?
The price and inventory of LM4051CIM3-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CIM3-ADJ is usually 5 days.
3.What payment methods are accepted for LM4051CIM3-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3-ADJ transactions.
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4.How is shipping managed for LM4051CIM3-ADJ?
LM4051CIM3-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3-ADJ 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 LM4051CIM3-ADJ?
For technical support, including LM4051CIM3-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3-ADJ requirements.
6.How does Aetrix verify that LM4051CIM3-ADJ is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3-ADJ 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 LM4051CIM3-ADJ meets industry standards.
7.What is the process for return or replacement of LM4051CIM3-ADJ?
All LM4051CIM3-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3-ADJ, 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 LM4051CIM3-ADJ part is unused and in its original packaging.
Return procedure for LM4051CIM3-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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