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Texas Instruments LM4051CIM3-1.2/NOPB
- Part No.:
- LM4051CIM3-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051CIM3-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,881
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Product details
Overview
LM4051CIM3-1.2/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, 20 μVrms noise (10 Hz–10 kHz), and stable operation from 60 μA to 12 mA supply current. It serves as a low-drift, low-noise voltage基准 in portable data acquisition and battery-powered instrumentation.
For engineers reviewing the LM4051CIM3-1.2/NOPB datasheet, LM4051CIM3-1.2/NOPB pinout, LM4051CIM3-1.2/NOPB application, or LM4051CIM3-1.2/NOPB equivalent, key selection criteria include its C-grade accuracy, industrial/extended temperature support (−40°C to +125°C), no-output-capacitor requirement, capacitive-load tolerance, and SOT-23 footprint compatibility for space-constrained PCBs.
Technical Context
The LM4051CIM3-1.2/NOPB implements a curvature-corrected bandgap shunt reference architecture, operating as a two-terminal device where cathode regulates voltage by sinking variable current to maintain 1.225 V across its terminals. Its internal fuse-and-zener-zap trimming ensures grade-specific initial accuracy without external calibration.
It functions exclusively in closed-loop mode with internal feedback, requiring only an external series resistor (RS) to set operating current. Unlike adjustable variants, it lacks a dedicated feedback pin-pin 3 is NC (must float or connect to pin 2) and does not participate in regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V reverse breakdown voltage at 100 μA test current; defines precise voltage reference point for ADCs, DACs, and comparators. |
| Initial Tolerance | ±0.5% (C-grade) at 25°C; translates to ±6.1 mV absolute error, suitable for mid-precision measurement systems. |
| Tempco | 50 ppm/°C maximum over −40°C to +125°C; contributes ≤±6.5 mV drift across full extended range, enabling stable operation in automotive under-hood environments. |
| Noise (10 Hz–10 kHz) | 20 μVrms; low enough to avoid degrading 12-bit ADC effective resolution in portable sensors. |
| Operating Current Range | 60 μA to 12 mA; supports ultra-low-power sleep modes (e.g., 60 μA in battery backup) and robust regulation under transient load steps. |
| Thermal Hysteresis | 0.36 mV/V; ensures repeatable voltage after thermal cycling, critical for calibration-critical medical and test equipment. |
Pinout & Package
SOT-23-3 (DBZ) package: 3.00 mm × 1.30 mm body, surface-mount, tape-and-reel compatible. Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC (No Connect - must be left floating or tied to Pin 2 per datasheet).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Common return path for shunt current; must be connected to system ground or low-impedance reference plane. |
| Cathode (Pin 2) | Regulated output terminal | Delivers stable 1.225 V relative to anode; sinks all excess current from RS to maintain voltage; requires low-inductance trace routing. |
| NC (Pin 3) | Non-functional terminal | Internally unconnected; datasheet mandates floating or connection to Pin 2 - no signal routing or decoupling allowed. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-limited layouts (e.g., wearables, sensor nodes) without stability-compromising bypass components. |
| Tolerates capacitive loads | Remains stable with up to 10 nF on cathode, simplifying filtering in noisy power domains without phase-margin analysis. |
| Sub-miniature SOT-23 package | 3.0 mm × 1.3 mm footprint reduces board area by >50% vs. SOIC-8 references, ideal for high-density portable PCBs. |
| Low quiescent current | 60 μA minimum operating current enables multi-year battery life in always-on IoT endpoints and energy harvesters. |
| Extended temperature range | Rated from −40°C to +125°C, supporting under-hood automotive, industrial motor control, and outdoor telecom applications. |
Applications
| Portable Data Acquisition | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Handheld multimeter measuring DC voltage with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for ADC full-scale calibration, rejecting supply ripple and thermal drift. Use Value: Enables ±0.5% measurement accuracy across −10°C to +50°C ambient without recalibration, meeting IEC 61010 Class II requirements. |
Use Scenario: Portable gas detector using electrochemical sensor and low-power microcontroller. IC Role / Device Role / Timing Role: Supplies precision bias voltage to sensor amplifier and reference for analog front-end ADC. Use Value: Maintains <10 ppm/°C effective drift over battery discharge cycle, ensuring consistent gas concentration reporting for 5+ years. |
| Medical Vital Sign Monitor | Automotive Cabin Control Module |
Use Scenario: Wearable pulse oximeter with photodiode signal conditioning and analog-to-digital conversion. IC Role / Device Role / Timing Role: Acts as low-noise voltage reference for transimpedance amplifier and ADC reference rail. Use Value: 20 μVrms noise prevents degradation of SpO2 resolution below 90%, satisfying FDA Class II accuracy thresholds. |
Use Scenario: HVAC control unit monitoring cabin temperature, humidity, and air quality sensors. IC Role / Device Role / Timing Role: Supplies stable reference for multiple 10-bit ADC channels reading thermistors and NTCs. Use Value: 50 ppm/°C tempco limits offset error to <0.1°C over −40°C to +85°C operating range, meeting ISO 16750-4 automotive environmental specs. |
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 fixed output, ±2% initial tolerance, higher 600 μA min current, 0.2 Ω dynamic impedance. | Requires external resistor divider for 1.225 V scaling; less accurate and noisier (40 μVrms), but higher current capability. | Select when cost sensitivity outweighs precision needs and 2.5 V reference suffices with scaling. |
| REF3012AIDBZR | 1.2 V output, ±0.2% (A-grade) tolerance, 25 ppm/°C tempco, 30 μVrms noise, 50 μA min current. | Series reference (3-pin), requires input headroom; superior accuracy/noise but larger solution size and higher BOM count. | Choose for highest precision in non-space-constrained designs where 1.2 V exact match and lower drift are mandatory. |
Compared with TL431CDBZR and REF3012AIDBZR, LM4051CIM3-1.2/NOPB offers the smallest footprint and lowest quiescent current among 1.2 V-class references, trading off some accuracy for ultra-compact, capacitor-free operation in battery-critical systems.
Availability
LM4051CIM3-1.2/NOPB is available at Aetrix Electronics and suitable for portable data acquisition, battery-powered instrumentation, and medical vital sign monitors requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM4051CIM3-1.2/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-volume manufacturing reliability.
The LM4051-N family was engineered specifically for space-constrained, low-power applications demanding high initial accuracy and thermal stability - targeting portable instrumentation, medical devices, and automotive subsystems where board area and battery life are critical.
FAQ
What is the output voltage tolerance of LM4051CIM3-1.2/NOPB at 25°C?
The LM4051CIM3-1.2/NOPB is a C-grade device with ±0.5% initial output voltage tolerance at 25°C, corresponding to ±6.1 mV deviation from the nominal 1.225 V reverse breakdown voltage. This specification is production-tested and guaranteed per TI's SNOS491D datasheet Section 6.5.
Does LM4051CIM3-1.2/NOPB require an external output capacitor for stability?
No, LM4051CIM3-1.2/NOPB does not require an external output capacitor - its advanced curvature-corrected bandgap design ensures inherent stability with any capacitive load up to 10 nF. This eliminates layout complexity and saves board space, as confirmed in the "Features" and "Description" sections of the official datasheet.
What is the minimum operating current for LM4051CIM3-1.2/NOPB across temperature?
The LM4051CIM3-1.2/NOPB requires a minimum operating current of 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 SNOS491D datasheet. At 25°C, the typical minimum is 39 μA, but design must accommodate worst-case conditions.
How is pin 3 used on LM4051CIM3-1.2/NOPB?
Pin 3 of LM4051CIM3-1.2/NOPB is designated NC (No Connect) and must either be left floating or connected directly to pin 2 (Cathode) - it is not electrically active and must never be routed to ground or other signals. This requirement is explicitly stated in the "Pin Functions" table (Section 5) of the TI datasheet.
What is the temperature coefficient specification for LM4051CIM3-1.2/NOPB?
The LM4051CIM3-1.2/NOPB has a guaranteed maximum temperature coefficient of ±50 ppm/°C over the full −40°C to +125°C range. This means its output voltage drift is bounded to ±6.5 mV across that span, calculated as 1.225 V × 50 ppm/°C × 165°C delta, and is validated via statistical quality control per datasheet Section 6.5.
LM4051CIM3-1.2/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
LM4051CIM3-1.2/NOPB FAQ
1.How can I place an order for LM4051CIM3-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051CIM3-1.2/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 LM4051CIM3-1.2/NOPB reliable?
The price and inventory of LM4051CIM3-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051CIM3-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051CIM3-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051CIM3-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051CIM3-1.2/NOPB?
LM4051CIM3-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051CIM3-1.2/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 LM4051CIM3-1.2/NOPB?
For technical support, including LM4051CIM3-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051CIM3-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051CIM3-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051CIM3-1.2/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 LM4051CIM3-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051CIM3-1.2/NOPB?
All LM4051CIM3-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051CIM3-1.2/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 LM4051CIM3-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051CIM3-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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