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Texas Instruments LM4051BIM3X-1.2/NOPB
- Part No.:
- LM4051BIM3X-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3X-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,316
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Product details
Overview
LM4051BIM3X-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 ±0.1% 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 operates from 60 μA to 12 mA, enabling use in low-power analog front-ends and battery-powered sensor signal conditioning.
For engineers reviewing the LM4051BIM3X-1.2/NOPB datasheet, LM4051BIM3X-1.2/NOPB pinout, LM4051BIM3X-1.2/NOPB application, or LM4051BIM3X-1.2/NOPB equivalent, key selection criteria include output stability under capacitive loads, no external capacitor requirement, grade-specific accuracy over extended temperature, and compatibility with shunt regulator topologies requiring precise 1.225 V reference points.
Technical Context
The LM4051BIM3X-1.2/NOPB implements a curvature-corrected bandgap shunt reference architecture, functioning 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 ±0.1% accuracy at 25°C for A-grade units.
It requires no output capacitor and remains stable with any capacitive load due to inherent phase margin design. The SOT-23-3 package integrates an internal feedback path-pin 3 must be left floating or tied to pin 2 (cathode), distinguishing it from adjustable variants where pin 3 serves as the feedback node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V fixed reverse breakdown voltage - sets precise threshold for clamping, level detection, or ADC reference without external resistors. |
| Initial Tolerance | ±0.1% at 25°C (A-grade) - enables high-accuracy calibration in portable instrumentation without post-fabrication trimming. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - ensures ≤±5.2 mV total drift over industrial range, critical for stable sensor biasing. |
| Noise (10 Hz–10 kHz) | 20 μVrms - supports 16-bit+ resolution in data acquisition systems without added filtering. |
| Operating Current | 60 μA to 12 mA - allows operation from ultra-low-power microcontrollers (e.g., sleep-mode wake-up circuits) up to moderate-current shunt regulation. |
| Dynamic Impedance | 0.5 Ω at 1 mA / 120 Hz - provides stiff voltage source behavior under dynamic load transients in precision current sources. |
| Long-Term Stability | 120 ppm (1000 hrs @ 25°C) - guarantees minimal drift in medical or energy metering applications requiring multi-year calibration integrity. |
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 1) | Reference ground node | Connected to system ground; forms return path for shunt current and defines voltage reference point for cathode regulation. |
| Cathode (Pin 2) | Regulated output terminal | Delivers stable 1.225 V when reverse-biased; sinks all excess current from series resistor to maintain voltage; must be connected via external RS to input supply. |
| NC / Float (Pin 3) | Non-connected / optional tie | Must be left floating or connected to Pin 2 (cathode); not used for feedback-distinguishes fixed 1.225 V variant from adjustable LM4051-ADJ. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Eliminates BOM cost and board space for stabilization; simplifies layout in space-constrained wearables and IoT nodes. |
| Tolerates capacitive loads | Enables direct connection to ADC input caps or op-amp feedback networks without risk of oscillation or overshoot. |
| 1.225 V fixed breakdown | Matches common low-voltage rail thresholds (e.g., 1.2 V core supplies) and eliminates resistor divider error in reference generation. |
| 60 μA minimum operating current | Supports operation from micro-power LDOs or high-impedance bias networks in battery-gauging ICs and energy harvesters. |
| −40°C to +125°C operation | Validated for under-hood automotive sensors, industrial motor drives, and outdoor telecom equipment without derating. |
Applications
| Portable Medical Sensors | Data Acquisition Front-Ends |
|---|---|
Use Scenario: Powering analog signal chains in handheld ECG monitors and pulse oximeters with single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225 V bias for instrumentation amplifiers and 16-bit SAR ADCs. Use Value: Enables <1 LSB INL error over temperature and battery discharge cycle due to ±0.1% initial tolerance and 50 ppm/°C tempco. | Use Scenario: High-resolution voltage measurement in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Precision reference for 24-bit delta-sigma ADCs in isolated current/voltage sensing channels. Use Value: 20 μVrms noise floor preserves effective resolution; no external capacitor reduces component count and improves long-term reliability. |
| Battery Management Systems | Automotive Cabin Sensors |
Use Scenario: Cell voltage monitoring in 3S–4S Li-ion packs for e-bikes and power tools. IC Role / Device Role / Timing Role: Reference for comparator-based overvoltage/undervoltage protection circuits and coulomb counting integrators. Use Value: Stable 1.225 V threshold ensures consistent trip points across −40°C to +85°C ambient, preventing false shutdowns during cold starts. | Use Scenario: Humidity and CO₂ sensor signal conditioning in automotive HVAC control units. IC Role / Device Role / Timing Role: Bias reference for bridge sensor excitation and low-noise op-amp gain stages. Use Value: 120 ppm long-term stability maintains calibration accuracy over 10+ year vehicle lifetime without field recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495 V nominal output, higher 100 μA min current, 2% initial tolerance (standard grade) | Requires external resistor divider to scale down to 1.225 V, adding error and temperature drift | Select only if 2.5 V reference is acceptable or if higher output current capability (>100 mA) is needed. |
| MAX6012AEUR+T | 1.2 V output, ±0.2% initial tolerance (A-grade), 35 ppm/°C tempco, SOT-23-3 | Looser initial accuracy and higher tempco reduce system-level calibration margin vs. LM4051BIM3X-1.2/NOPB | Choose when cost sensitivity outweighs need for ±0.1% accuracy and 20 μVrms noise performance. |
Compared with TL431ACDBVR and MAX6012AEUR+T, the LM4051BIM3X-1.2/NOPB delivers superior initial accuracy, lower noise, and tighter tempco in the exact 1.225 V point-making it optimal for applications where reference-induced error directly limits measurement fidelity, such as portable diagnostic devices and high-end data loggers.
Availability
LM4051BIM3X-1.2/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, and battery management applications requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for LM4051BIM3X-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 and broad industrial portfolio coverage.
The LM4051-N product line delivers micropower shunt references optimized for space-constrained, battery-operated, and high-accuracy measurement systems-designed specifically for applications demanding low drift, low noise, and zero-output-capacitor simplicity.
FAQ
What is the output voltage tolerance of the LM4051BIM3X-1.2/NOPB at 25°C?
The LM4051BIM3X-1.2/NOPB has a ±0.1% initial output voltage tolerance at 25°C, corresponding to ±1.225 mV around the nominal 1.225 V reverse breakdown voltage. This A-grade specification is achieved via on-wafer fuse and zener-zap trimming and is fully production-tested per TI's SNOS491D datasheet.
Does the LM4051BIM3X-1.2/NOPB require an external output capacitor for stability?
No, the LM4051BIM3X-1.2/NOPB does not require an external output capacitor for stability. Its internal design ensures unconditional stability with any capacitive load, including direct connection to ADC input capacitors or op-amp feedback networks. A bypass capacitor on the input is optional but recommended for noise reduction.
What is the minimum operating current for the LM4051BIM3X-1.2/NOPB across temperature?
The LM4051BIM3X-1.2/NOPB requires a minimum operating current of 60 μA over the full industrial temperature range (−40°C to +85°C) and 70 μA over the extended range (−40°C to +125°C). This value is specified in the LM4051-1.2 Electrical Characteristics table of the SNOS491D datasheet and applies to A-grade devices.
How is pin 3 used on the LM4051BIM3X-1.2/NOPB in SOT-23-3 package?
Pin 3 of the LM4051BIM3X-1.2/NOPB is a no-connect (NC) terminal and must be left floating or tied to pin 2 (cathode). Unlike the adjustable LM4051-ADJ variant, this pin is not used for feedback-its internal connection is disabled to support the fixed 1.225 V configuration, as confirmed in the Pin Functions section of the TI datasheet.
Can the LM4051BIM3X-1.2/NOPB be used in automotive under-hood applications?
Yes, the LM4051BIM3X-1.2/NOPB is qualified for operation from −40°C to +125°C and meets the extended temperature range specifications in the SNOS491D datasheet. Its 50 ppm/°C max tempco and ±5.2 mV overtemperature tolerance make it suitable for engine control modules, cabin air quality sensors, and other under-hood automotive subsystems requiring precision voltage referencing.
LM4051BIM3X-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:
- ±0.2%
- 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
LM4051BIM3X-1.2/NOPB FAQ
1.How can I place an order for LM4051BIM3X-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3X-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 LM4051BIM3X-1.2/NOPB reliable?
The price and inventory of LM4051BIM3X-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 LM4051BIM3X-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051BIM3X-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3X-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIM3X-1.2/NOPB?
LM4051BIM3X-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3X-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 LM4051BIM3X-1.2/NOPB?
For technical support, including LM4051BIM3X-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3X-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051BIM3X-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3X-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 LM4051BIM3X-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051BIM3X-1.2/NOPB?
All LM4051BIM3X-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3X-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 LM4051BIM3X-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051BIM3X-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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