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Texas Instruments LM4051CIM3X-1.2
- Part No.:
- LM4051CIM3X-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3X-1.2.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,884
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Product details
Overview
LM4051CIM3X-1.2 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 ±0.5% initial tolerance (C grade), 50 ppm/°C max temperature coefficient, 20 μVrms noise (10 Hz–10 kHz), and stable operation from 60 μA to 12 mA supply current. It serves as a compact, capacitor-free reference in battery-powered data acquisition and portable instrumentation.
For engineers reviewing the LM4051CIM3X-1.2 datasheet, LM4051CIM3X-1.2 pinout, LM4051CIM3X-1.2 application, or LM4051CIM3X-1.2 equivalent, key selection criteria include its C-grade accuracy, industrial/extended temperature range (−40°C to +125°C), low quiescent current, no-output-capacitor requirement, and SOT-23 footprint compatibility for space-constrained PCBs.
Technical Context
The LM4051CIM3X-1.2 implements a curvature-corrected bandgap shunt reference architecture, operating as a two-terminal device where cathode regulates voltage by shunting excess current to ground. Its internal fuse-and-zener-zap trimming ensures factory-set 1.225 V output at 25°C with guaranteed performance across −40°C to +125°C.
It requires only an external series resistor (RS) between input and cathode, with no mandatory bypass capacitor-stability is maintained even with capacitive loads. Pin 3 (NC) must be left floating or tied to pin 2 (anode), distinguishing it from the adjustable variant's feedback pin configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage - sets precise reference point for ADCs, DACs, and comparators without external resistors. |
| Initial Tolerance (C Grade) | ±0.5% at 25°C - defines worst-case DC offset in precision measurement circuits before temperature drift. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - limits voltage drift to ±6.5 mV over full extended temperature range. |
| Operating Current Range | 60 μA to 12 mA - enables ultra-low-power sensor nodes and high-current shunt regulation in same footprint. |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - supports 16-bit+ resolution in battery-powered data loggers without added filtering. |
| Package | SOT-23-3 (DBZ), 3.00 mm × 1.30 mm - fits 0805-sized footprints, enabling high-density layout in wearables and IoT edge nodes. |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 2) | Reference ground node | Common return path for shunt current; must connect to system ground or low-impedance reference plane. |
| Cathode (Pin 1) | Voltage regulation terminal | Input/output node where regulated 1.225 V appears; connects to RS and load; carries full shunt current. |
| NC (Pin 3) | No-connect terminal | Must remain unconnected or tied to pin 2 (anode); not internally bonded - floating connection avoids parasitic leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-limited designs (e.g., medical patches) without stability-compromising layout constraints. |
| Tolerates capacitive loads | Supports direct connection to ADC input capacitors or long PCB traces without oscillation risk. |
| Reverse breakdown voltage option | Fixed 1.225 V output eliminates external resistor network errors and simplifies BOM for single-voltage systems. |
| Low minimum operating current | 60 μA start-up threshold allows operation from coin-cell batteries (CR2032) for >5 years in sleep-mode sensing. |
| Guaranteed tempco over extended range | 50 ppm/°C spec validated from −40°C to +125°C ensures repeatability in automotive under-hood or industrial motor-control environments. |
Applications
| Portable Data Loggers | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Continuous 16-bit ADC sampling in handheld environmental monitors powered by AA alkaline cells. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225 V reference for SAR ADC conversion, replacing bulkier three-terminal references. Use Value: Enables 0.01% measurement accuracy over −20°C to +60°C ambient with no calibration, due to C-grade tolerance and 50 ppm/°C tempco. | Use Scenario: Portable pH meter with microcontroller-based signal conditioning and LCD display. IC Role / Device Role / Timing Role: Precision reference for op-amp-based electrode signal amplification and analog front-end biasing. Use Value: Delivers <20 μVrms noise floor, preserving signal integrity of sub-mV electrochemical signals without additional filtering stages. |
| Energy Management Systems | Medical Sensor Nodes |
Use Scenario: Smart electricity meter sub-board measuring AC line voltage via resistive divider and isolated ADC. IC Role / Device Role / Timing Role: Stable reference for metrology-grade ADC ensuring Class 0.5 accuracy compliance under varying grid temperatures. Use Value: Maintains ±0.5% output tolerance across −40°C to +85°C industrial operating range, eliminating need for on-board temperature compensation firmware. | Use Scenario: Disposable wearable ECG patch with 7-day battery life and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Low-quiescent reference for analog front-end and ADC in ultra-low-power biosignal chain. Use Value: Draws only 60 μA minimum current, extending CR2016 battery life while maintaining 1.225 V reference stability during intermittent wake cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIM3-1.2 | Same 1.225 V output, but higher 1% initial tolerance (C grade), 100 ppm/°C tempco, and 30 μVrms noise. | Lower accuracy and higher drift limit use in non-critical biasing; unsuitable for 16-bit data acquisition. | Select LM4040CIM3-1.2 only when cost sensitivity outweighs precision requirements and thermal stability is secondary. |
| REF3012AIDBZR | 1.2 V output, 0.1% initial tolerance (A grade), 50 ppm/°C tempco, but 3.6 V to 5.5 V supply-dependent operation and 35 μVrms noise. | Requires higher supply voltage and delivers higher noise - incompatible with 1.8 V microcontrollers or ultra-low-noise sensor interfaces. | Choose REF3012AIDBZR only if A-grade accuracy is mandatory and system supply exceeds 3.6 V; otherwise LM4051CIM3X-1.2 offers superior noise and supply flexibility. |
Compared with LM4040CIM3-1.2, LM4051CIM3X-1.2 provides tighter tolerance and lower noise for precision measurement; versus REF3012AIDBZR, it operates down to 1.225 V supply with lower noise but lacks A-grade accuracy - making LM4051CIM3X-1.2 optimal for cost-sensitive, battery-powered 16-bit systems needing C-grade stability.
Availability
LM4051CIM3X-1.2 is available at Aetrix Electronics and suitable for portable data loggers, battery-powered instrumentation, and energy management systems requiring stable component supply with consistent parametric performance across production batches.
Supply support for LM4051CIM3X-1.2 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 over 50 years of precision reference design heritage.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems where size, accuracy, and low quiescent current are critical - targeting portable instrumentation, medical sensors, and industrial IoT endpoints.
FAQ
What is the output voltage tolerance of LM4051CIM3X-1.2 at 25°C?
The LM4051CIM3X-1.2 has a C-grade initial output voltage tolerance of ±0.5% at 25°C, corresponding to ±6.125 mV around the nominal 1.225 V reverse breakdown voltage. This value is production-tested and specified in the Electrical Characteristics table of the official TI datasheet SNOS491D.
Does LM4051CIM3X-1.2 require an external output capacitor for stability?
No, LM4051CIM3X-1.2 does not require an external output capacitor for stability. Its advanced curvature-corrected bandgap design ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or long PCB traces - a key advantage over older shunt references.
What is the minimum operating current for LM4051CIM3X-1.2 across temperature?
The minimum operating current for LM4051CIM3X-1.2 is 65 µA over the industrial temperature range (−40°C to +85°C) and 70 µA over the extended range (−40°C to +125°C), per Section 6.5 of the TI datasheet. At 25°C, it is 39 µA, but design must accommodate the worst-case 70 µA to ensure regulation across full operating conditions.
How is pin 3 used on LM4051CIM3X-1.2?
Pin 3 of LM4051CIM3X-1.2 is a no-connect (NC) terminal. Per TI's Pin Functions table, it must be left floating or connected to pin 2 (anode); it is not internally bonded and serves no electrical function. Incorrect routing to ground or signal nets may introduce leakage or measurement error.
Can LM4051CIM3X-1.2 replace LM4051AIM3X-1.2 in a design?
Yes, LM4051CIM3X-1.2 can replace LM4051AIM3X-1.2 physically and electrically, as both share identical SOT-23-3 packaging, pinout, and 1.225 V nominal output. However, the C-grade part has ±0.5% initial tolerance versus ±0.1% for the A-grade, so system-level accuracy validation is required if the original design relied on A-grade precision.
LM4051CIM3X-1.2 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:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- 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:
- 65 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051CIM3X-1.2 FAQ
1.How can I place an order for LM4051CIM3X-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3X-1.2 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-1.2 reliable?
The price and inventory of LM4051CIM3X-1.2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CIM3X-1.2 is usually 5 days.
3.What payment methods are accepted for LM4051CIM3X-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3X-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3X-1.2?
LM4051CIM3X-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3X-1.2 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-1.2?
For technical support, including LM4051CIM3X-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3X-1.2 requirements.
6.How does Aetrix verify that LM4051CIM3X-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3X-1.2 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-1.2 meets industry standards.
7.What is the process for return or replacement of LM4051CIM3X-1.2?
All LM4051CIM3X-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3X-1.2, 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-1.2 part is unused and in its original packaging.
Return procedure for LM4051CIM3X-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4051CIM3X-1.2 Tags
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