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Texas Instruments LM4051CIM3X-1.2/NOPB
- Part No.:
- LM4051CIM3X-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3X-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,573
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Product details
Overview
LM4051CIM3X-1.2/NOPB 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, and 20 μVrms wideband noise (10 Hz–10 kHz). It operates from 60 μA to 12 mA and supports industrial (−40°C to +85°C) and extended (−40°C to +125°C) temperature ranges - ideal for battery-powered instrumentation and portable data acquisition.
For engineers reviewing the LM4051CIM3X-1.2/NOPB datasheet, LM4051CIM3X-1.2/NOPB pinout, LM4051CIM3X-1.2/NOPB application, or LM4051CIM3X-1.2/NOPB equivalent, key selection considerations include its C-grade accuracy, no-output-capacitor-required stability, low quiescent current, thermal hysteresis of 0.36 mV/V, and compatibility with capacitive loads in space-constrained analog signal chains.
Technical Context
The LM4051CIM3X-1.2/NOPB functions as a curvature-corrected bandgap shunt reference, regulating by sinking variable current through its cathode to maintain a stable 1.225 V across anode-to-cathode terminals. Its internal fuse and zener-zap trimming ensures ±0.5% initial accuracy at 25°C for the C-grade variant, with guaranteed 50 ppm/°C tempco over −40°C to +125°C.
Unlike series references, it requires only a single external series resistor (RS) to set operating current; no feedback network is needed for the fixed 1.225 V version. Pin 3 (NC) must be left floating or tied to pin 2 (anode), and the device remains stable with any capacitive load - eliminating mandatory output bypassing while tolerating input ripple up to 15 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage - sets precise bias point for ADCs, DACs, and comparators without adjustment circuitry. |
| Initial Tolerance (C-grade) | ±0.5% at 25°C - enables cost-sensitive designs where moderate absolute accuracy suffices without calibration. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - ensures ≤±6.5 mV drift over full extended range, critical for unheated industrial sensors. |
| Operating Current Range | 60 μA to 12 mA - supports ultra-low-power wake-up circuits and high-current shunt regulation in same footprint. |
| Output Noise | 20 μVrms (10 Hz–10 kHz) - preserves SNR in 16-bit+ data acquisition front-ends without added filtering. |
| Dynamic Impedance | 0.5 Ω at 1 mA / 120 Hz - minimizes load-induced voltage shift during dynamic current draw in precision current sources. |
| Long-Term Stability | 120 ppm over 1000 hrs - reduces calibration drift in field-deployed medical and test equipment. |
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 for shunt current; must connect to system ground or low-impedance reference plane. |
| Cathode (Pin 1) | Voltage output terminal | Delivers regulated 1.225 V when reverse-biased; sinks all excess current from RS to maintain voltage. |
| NC (Pin 3) | No-connect terminal | Must remain floating or be tied to pin 2 (anode); not internally connected - avoids parasitic leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into compact PCB layouts without stability-compromising bypass components. |
| Tolerates capacitive loads | Supports direct connection to ADC input caps or op-amp feedback networks without oscillation risk. |
| Low minimum operating current | 60 μA enables operation from microamp-level energy harvesters or coin-cell batteries for >10-year life. |
| Reverse breakdown voltage option | Fixed 1.225 V eliminates external resistor divider, reducing BOM count and layout area vs adjustable variants. |
| Stable over industrial/extended temp | Guaranteed performance from −40°C to +125°C allows use in automotive under-hood and industrial PLC modules. |
Applications
| Portable Instrumentation | Data Acquisition Front-End |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC and lithium coin-cell power supply. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for ADC full-scale calibration and offset nulling. Use Value: Enables ±0.5% measurement accuracy across −10°C to +50°C ambient without recalibration. |
Use Scenario: Isolated sensor node measuring thermocouple output via cold-junction compensation. IC Role / Device Role / Timing Role: Supplies precision bias to instrumentation amplifier and reference for ratiometric ADC conversion. Use Value: Maintains <1 LSB error over 0–100°C sensor range due to 50 ppm/°C tempco and low thermal hysteresis. |
| Battery-Powered Medical Sensors | Industrial Process Monitoring |
Use Scenario: Wearable ECG patch with ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Shunt reference for op-amp gain-setting and ADC reference in 3 V supply rail. Use Value: Draws only 60 μA quiescent current, extending 200 mAh coin-cell life beyond 2 years. |
Use Scenario: DIN-rail mounted temperature transmitter with 4–20 mA loop output. IC Role / Device Role / Timing Role: Stable voltage reference for current-loop DAC and sensor excitation circuitry. Use Value: Ensures <±0.1% loop accuracy over −40°C to +85°C cabinet environment with no derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | 2.495 V nominal, ±2% initial tolerance, higher 600 μA min current, 0.22 Ω dynamic impedance | Requires external resistive divider for 1.225 V; unsuitable for sub-100 μA systems | Select when higher output voltage or tighter dynamic impedance is prioritized over micropower operation. |
| REF3012AIDBZR | 1.2 V series reference, ±0.2% initial tolerance, 50 ppm/°C tempco, 50 μA quiescent current | Series architecture demands output capacitor; incompatible with shunt-based topologies | Choose for lower dropout and better PSRR in regulated supply rails - not a drop-in replacement. |
Compared with TL431CDBZR and REF3012AIDBZR, the LM4051CIM3X-1.2/NOPB uniquely combines fixed 1.225 V output, C-grade accuracy, micropower operation down to 60 μA, and shunt topology - making it the only viable option for space- and current-constrained 1.2 V reference needs without external dividers or bypass caps.
Availability
LM4051CIM3X-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, data acquisition systems, and battery-powered medical sensors requiring stable component supply with consistent C-grade specifications and SOT-23-3 packaging.
Supply support for LM4051CIM3X-1.2/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 for industrial, automotive, and consumer markets.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, low-current applications - designed specifically for battery-powered instrumentation, portable data loggers, and high-accuracy sensor signal conditioning where minimal board area and ultra-low quiescent current are mandatory.
FAQ
What is the output voltage tolerance of LM4051CIM3X-1.2/NOPB at 25°C?
The LM4051CIM3X-1.2/NOPB is a C-grade device with ±0.5% initial output voltage tolerance at 25°C, corresponding to ±6.125 mV around the nominal 1.225 V reverse breakdown voltage. This tolerance is production-tested and specified in the Electrical Characteristics table under "Reverse Breakdown Voltage Tolerance" for LM4051CIM3 devices.
Does LM4051CIM3X-1.2/NOPB require an external output capacitor for stability?
No, the LM4051CIM3X-1.2/NOPB 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 op-amp feedback networks - a key differentiator from most shunt references.
What is the minimum operating current for LM4051CIM3X-1.2/NOPB across temperature?
The LM4051CIM3X-1.2/NOPB has a minimum operating current of 60 μA at 25°C, increasing to 65 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 LM4051-1.2 Electrical Characteristics table for C-grade devices.
How is pin 3 used on LM4051CIM3X-1.2/NOPB?
Pin 3 of the LM4051CIM3X-1.2/NOPB is a no-connect (NC) terminal. Per the official datasheet Pin Functions table and Figure 5 (DBZ Package Top View), it must either be left floating or connected to pin 2 (anode); it is not internally bonded and serves no electrical function in the fixed 1.225 V configuration.
What is the thermal hysteresis specification for LM4051CIM3X-1.2/NOPB?
The LM4051CIM3X-1.2/NOPB exhibits a thermal hysteresis of 0.36 mV/V, defined as the voltage shift measured at +25°C after cycling between −40°C and +125°C. This value is specified in the LM4051-1.2 Electrical Characteristics table and reflects mechanical stress-induced drift in the SOT-23 package, independent of grade.
LM4051CIM3X-1.2/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:
- 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/NOPB FAQ
1.How can I place an order for LM4051CIM3X-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3X-1.2/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-1.2/NOPB reliable?
The price and inventory of LM4051CIM3X-1.2/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-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051CIM3X-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3X-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3X-1.2/NOPB?
LM4051CIM3X-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3X-1.2/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-1.2/NOPB?
For technical support, including LM4051CIM3X-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3X-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051CIM3X-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3X-1.2/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-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051CIM3X-1.2/NOPB?
All LM4051CIM3X-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3X-1.2/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-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051CIM3X-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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