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Texas Instruments LM4051CIM3X-ADJ
- Part No.:
- LM4051CIM3X-ADJ
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3X-ADJ.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,012
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Product details
Overview
LM4051CIM3X-ADJ 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 serves as a stable reference in low-current, space-constrained analog signal chains for battery-powered instrumentation and data acquisition.
For engineers reviewing the LM4051CIM3X-ADJ datasheet, LM4051CIM3X-ADJ pinout, LM4051CIM3X-ADJ application, or LM4051CIM3X-ADJ equivalent, key selection criteria include its no-capacitor-required stability, 60 μA minimum operating current, feedback-pin-based adjustability, and guaranteed performance over extended industrial temperature range.
Technical Context
The LM4051CIM3X-ADJ operates as a curvature-corrected bandgap shunt reference, using internal amplifier feedback between Cathode and Reference pins to regulate output voltage via current shunting. Its design eliminates need for external stabilization capacitors while maintaining stability with any capacitive load.
It functions in closed-loop configurations where external resistor dividers set output voltage per VOUT = VREF(1 + R1/R2), with VREF = 1.212 V (typ) at 100 μA and output-voltage-dependent drift (−1.69 mV/V). Feedback current is ultra-low (70–130 nA), minimizing divider loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 1.24 V to 10 V - programmable via external resistor divider connected to FB pin |
| Initial Tolerance (A-grade) | ±0.1% at 25°C - enables high-accuracy ADC/DAC biasing without calibration |
| Tempco (max) | 50 ppm/°C (−40°C to +125°C) - ensures <±5.2 mV total drift over industrial range |
| Operating Current Range | 60 μA to 12 mA - supports ultra-low-power sensor nodes and high-current shunt regulation |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - suitable for 16-bit+ precision measurement front-ends |
| Dynamic Impedance | 0.3 Ω at 1 mA - maintains regulation stability under fast load transients |
| Feedback Current | 70–130 nA - allows use of high-value resistors (e.g., 1 MΩ) without significant divider error |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm surface-mount, thermally optimized for PCB trace heat sinking. Pin 3 is cathode (output) for LM4051-ADJ variants; pin 2 is anode (input); pin 1 is feedback (FB) - not NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (FB) | Reference input | Connects to resistor divider midpoint; senses output voltage ratio to maintain VREF = 1.212 V at node |
| Pin 2 (Anode) | Current sink return | Common ground connection; all shunt current flows here when regulating |
| Pin 3 (Cathode) | Output / shunt node | Regulated voltage output; connects to supply rail being stabilized via series resistor RS |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable operation without bypass cap - reduces BOM count and board area in portable designs |
| Tolerates capacitive loads | Remains stable driving >1 μF - enables direct interface to ADC sample capacitors or LDO inputs |
| Adjustable breakdown voltage | 1.24–10 V range via two-resistor feedback - replaces multiple fixed references with single SKU |
| Ultra-low quiescent current | 60 μA min operating current - extends battery life in always-on monitoring systems |
| Low thermal hysteresis | 0.3 mV/V - minimizes repeatability error after thermal cycling in field-deployed equipment |
Applications
| Portable Data Loggers | Precision Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over multi-year deployments. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5 V bias for sigma-delta ADC and op-amp signal chain. Use Value: 60 μA minimum current and 20 μVrms noise enable >16-bit ENOB with 10-year battery life and <0.01% full-scale drift. | Use Scenario: Industrial pressure transmitter with 4–20 mA loop powered by 24 V supply and requiring ratiometric accuracy. IC Role / Device Role / Timing Role: Adjustable 4.096 V reference for DAC generating precise loop current setpoint. Use Value: ±0.1% initial tolerance and 50 ppm/°C tempco ensure <±0.05% total error across −40°C to +85°C ambient. |
| Medical Patient Monitor Front-End | Energy Meter Reference Subsystem |
Use Scenario: Portable ECG device digitizing biopotential signals with isolated 3.3 V supply and 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Low-noise 1.25 V reference for ADC internal PGA and anti-alias filter. Use Value: 20 μVrms noise and no capacitor requirement eliminate layout sensitivity and reduce EMI susceptibility in compact enclosures. | Use Scenario: DIN-rail mounted kWh meter using shunt-based current sensing and metrology-grade ADC. IC Role / Device Role / Timing Role: 2.048 V reference for dual 24-bit ADCs measuring voltage and current simultaneously. Use Value: 0.3 Ω dynamic impedance and 70–130 nA feedback current minimize gain error and enable high-impedance divider networks for long-term stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | Fixed 1.24 V output; 0.5% initial tolerance; 30 ppm/°C tempco; 60 μA min current | Lacks adjustability; higher initial error limits accuracy in high-resolution systems | Choose for cost-sensitive, fixed-voltage designs where ±0.5% tolerance is acceptable |
| MAX6008AEUR+T | Adjustable 1.18–10 V; ±0.2% initial tolerance; 75 ppm/°C tempco; 80 μA min current | Higher tempco and current increase drift and power consumption in wide-temp or battery apps | Choose when TI supply chain constraints exist and 0.2% tolerance meets system spec |
Compared with TLV431ACDBVR and MAX6008AEUR+T, the LM4051CIM3X-ADJ provides superior initial accuracy (±0.1%), lower tempco (50 ppm/°C), and lower minimum operating current (60 μA), making it optimal for high-precision, low-power, and extended-temperature applications where reference stability directly impacts measurement integrity.
Availability
LM4051CIM3X-ADJ is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, and industrial process control requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LM4051CIM3X-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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer product portfolios.
The LM4051-N series was designed specifically for space-constrained, micropower analog systems requiring high-accuracy voltage references without external compensation components - targeting battery-powered test equipment, medical sensors, and energy metering.
FAQ
What is the minimum operating current for LM4051CIM3X-ADJ across temperature?
The LM4051CIM3X-ADJ requires a minimum operating current of 60 μA over the full industrial temperature range (−40°C to +85°C) and extended range (−40°C to +125°C), as specified in the LM4051-ADJ Electrical Characteristics table. This value applies to all A/B/C grades and ensures proper regulation and gain in the internal amplifier. Below this current, the device may exit regulation or exhibit increased output impedance.
Can LM4051CIM3X-ADJ be used without an external capacitor?
Yes, the LM4051CIM3X-ADJ is explicitly designed to operate stably without any external capacitor - neither on input nor output - due to its advanced curvature-corrected bandgap architecture and internal compensation. The datasheet confirms "No Output Capacitor Required" as a key feature. Adding a capacitor (e.g., 0.1 μF ceramic) is optional and improves noise rejection but is never mandatory for stability.
How does the feedback pin (Pin 1) function in LM4051CIM3X-ADJ?
In the LM4051CIM3X-ADJ, Pin 1 (FB) is the reference input that senses the divided output voltage. The internal amplifier compares this voltage to its 1.212 V bandgap reference and adjusts shunt current at the cathode (Pin 3) to maintain VFB = 1.212 V. This enables programmable output via R1/R2 divider where VOUT = 1.212 V × (1 + R1/R2), with typical feedback current of 70–130 nA minimizing divider loading error.
What is the maximum output voltage achievable with LM4051CIM3X-ADJ?
The LM4051CIM3X-ADJ supports an output voltage range of 1.24 V to 10 V, as stated in Section 6.3 Recommended Operating Conditions. This upper limit is defined by absolute maximum ratings (15 V max output voltage) and practical considerations including output saturation effects above 10 V in SOT-23 packaging. For reliable operation, TI specifies 10 V as the maximum recommended VOUT in standard applications.
Is LM4051CIM3X-ADJ suitable for automotive applications?
The LM4051CIM3X-ADJ is qualified for extended temperature operation up to +125°C and meets industrial reliability standards, but it is not AEC-Q200 qualified or specified for automotive use. Its datasheet lists "Automotive and Industrial" only as a general application category - not as a qualification statement. For automotive applications, TI recommends AEC-Q200 qualified alternatives such as the REF50xx series, while LM4051CIM3X-ADJ remains appropriate for industrial and medical equipment operating within −40°C to +125°C.
LM4051CIM3X-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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4051CIM3X-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3X-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 LM4051CIM3X-ADJ reliable?
The price and inventory of LM4051CIM3X-ADJ 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 is usually 5 days.
3.What payment methods are accepted for LM4051CIM3X-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3X-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3X-ADJ?
LM4051CIM3X-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3X-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 LM4051CIM3X-ADJ?
For technical support, including LM4051CIM3X-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3X-ADJ requirements.
6.How does Aetrix verify that LM4051CIM3X-ADJ is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3X-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 LM4051CIM3X-ADJ meets industry standards.
7.What is the process for return or replacement of LM4051CIM3X-ADJ?
All LM4051CIM3X-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3X-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 LM4051CIM3X-ADJ part is unused and in its original packaging.
Return procedure for LM4051CIM3X-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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