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Texas Instruments LM4051BIM3-1.2/NOPB
- Part No.:
- LM4051BIM3-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,889
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Product details
Overview
LM4051BIM3-1.2/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), 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 high-accuracy analog sensing and low-power data acquisition.
For engineers reviewing the LM4051BIM3-1.2/NOPB datasheet, LM4051BIM3-1.2/NOPB pinout, LM4051BIM3-1.2/NOPB application, or LM4051BIM3-1.2/NOPB equivalent, key selection criteria include output voltage stability under capacitive loads, minimal operating current requirement, thermal hysteresis performance (0.36 mV/V), no-output-capacitor operation, and compatibility with space-constrained battery-powered systems.
Technical Context
The LM4051BIM3-1.2/NOPB implements a curvature-corrected bandgap shunt reference architecture, functioning as a precision two-terminal Zener-like device with internal trimming via zener-zap and fuse techniques. Its regulation relies on shunting excess current to ground while maintaining stable cathode-to-anode voltage.
It operates exclusively in closed-loop mode with internal feedback, requiring only an external series resistor (RS) to set operating current. Unlike adjustable variants, pin 3 is not used as a feedback node but must be left floating or tied to pin 2 (cathode), reflecting its fixed-voltage topology and SOT-23 die-attach configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V nominal reverse breakdown voltage - sets precise reference point for ADCs, DACs, and comparators without external adjustment. |
| Initial Tolerance | ±0.1% at 25°C (A-grade) - enables high-accuracy calibration in portable instrumentation without post-manufacture 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 low-noise signal chains in precision data acquisition where reference noise directly impacts ENOB. |
| Operating Current Range | 60 μA to 12 mA - allows ultra-low-power operation in coin-cell devices while supporting higher-current load regulation. |
| Dynamic Impedance | 0.5 Ω at 1 mA / 120 Hz - provides low AC impedance for effective ripple rejection in noisy supply environments. |
| Long-Term Stability | 120 ppm over 1000 hours - ensures consistent accuracy in deployed medical or industrial equipment without recalibration. |
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 terminal | Connected to system ground; forms return path for shunt current - must be low-impedance for stable regulation. |
| Cathode (Pin 2) | Output voltage node | Delivers regulated 1.225 V; connects to RS and load - trace routing affects thermal coupling and noise immunity. |
| NC / Float (Pin 3) | Non-connected / optional tie | Internally connected to anode via die attach; must be left floating or tied to Pin 2 per TI layout guidance to avoid parasitic paths. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-limited PCBs (e.g., wearables) without stability-compromising external components. |
| Tolerates capacitive loads | Stable with any output capacitance - simplifies filtering in ADC reference buffers and eliminates phase-margin analysis. |
| Low 60 μA minimum operating current | Supports >10-year battery life in always-on IoT sensors using CR2032 or similar primary cells. |
| Reverse breakdown voltage option | Fixed 1.225 V output eliminates resistor-divider error and layout sensitivity of adjustable references. |
| Thermal hysteresis ≤0.36 mV/V | Minimizes calibration drift after thermal cycling - essential for field-deployed test equipment and automotive ECUs. |
Applications
| Portable Data Loggers | Medical Sensor Front-Ends |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and pressure with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225 V reference for ADC VREF input and op-amp biasing. Use Value: Enables <1 LSB INL error over −20°C to +70°C operating range due to 50 ppm/°C tempco and low thermal hysteresis. |
Use Scenario: Wearable ECG patch measuring microvolt-level biopotentials with ultra-low-power signal chain. IC Role / Device Role / Timing Role: Precision reference for instrumentation amplifier gain-setting and ADC reference, operating continuously from coin cell. Use Value: 60 μA min current and 20 μVrms noise ensure >100 dB SNR and multi-year runtime without compromising diagnostic fidelity. |
| Industrial Process Transmitters | Automotive Cabin Sensors |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in harsh factory environments. IC Role / Device Role / Timing Role: Reference for DAC generating loop current and for sensor excitation circuitry. Use Value: Extended −40°C to +125°C rating and ±5.2 mV overtemperature tolerance guarantee calibration integrity across full ambient range. |
Use Scenario: Occupancy detection module using IR proximity and ambient light sensing in vehicle cabin. IC Role / Device Role / Timing Role: Stable reference for photodiode transimpedance amplifier and ambient light ADC channel. Use Value: No-output-capacitor operation prevents cold-temperature capacitor derating issues common in automotive under-hood/cabin applications. |
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 | 2.5 V fixed output, ±2% initial tolerance, 500 μA min current, higher 22 Ω dynamic impedance | Requires external resistor divider for 1.225 V; unsuitable for ultra-low-power or high-precision use cases | Select LM4051BIM3-1.2/NOPB when 1.225 V, sub-100 μA operation, or <0.1% tolerance is mandatory |
| MAX6012AEUR+T | 1.2 V output, ±0.1% tolerance, 35 ppm/°C tempco, 65 μA min current, SOT-23-3 package | Nearly identical specs but uses series topology - higher dropout voltage limits low-VIN applicability | Choose LM4051BIM3-1.2/NOPB for true shunt operation with no minimum input voltage constraint and superior capacitive-load stability |
Compared with TL431CDBZR and MAX6012AEUR+T, the LM4051BIM3-1.2/NOPB uniquely combines fixed 1.225 V output, 60 μA minimum current, and inherent capacitive-load immunity - making it the optimal choice for battery-powered precision analog systems where layout simplicity and thermal stability are design-critical.
Availability
LM4051BIM3-1.2/NOPB is available at Aetrix Electronics and suitable for portable data loggers, medical sensor front-ends, industrial process transmitters, and automotive cabin sensors requiring stable component supply across long production lifecycles.
Supply support for LM4051BIM3-1.2/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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer markets.
The LM4051-N family was developed specifically for space-constrained, micropower precision analog applications - emphasizing ultra-low quiescent current, no-output-capacitor stability, and robust thermal performance in SOT-23 packaging.
FAQ
What is the exact output voltage and tolerance of LM4051BIM3-1.2/NOPB at 25°C?
The LM4051BIM3-1.2/NOPB delivers a nominal reverse breakdown voltage of 1.225 V with ±0.1% initial tolerance (A-grade) at 25°C, corresponding to ±1.2 mV absolute deviation. This specification is 100% production tested and guaranteed per TI's SNOS491D datasheet Section 6.5.
Does LM4051BIM3-1.2/NOPB require an external output capacitor for stability?
No - the LM4051BIM3-1.2/NOPB is explicitly designed to operate stably without any output capacitor, even with arbitrary capacitive loads. This is confirmed in the "Features" section and validated across all typical characteristics curves in the TI datasheet.
What is the minimum operating current for LM4051BIM3-1.2/NOPB across temperature?
The LM4051BIM3-1.2/NOPB requires a minimum operating current of 60 μA over the industrial temperature range (−40°C to +85°C), increasing to 70 μA over the extended range (−40°C to +125°C), as specified in Table 6.5 of the SNOS491D datasheet.
How is pin 3 used on LM4051BIM3-1.2/NOPB in the SOT-23 package?
Pin 3 of the LM4051BIM3-1.2/NOPB is internally connected to the anode through the die attach. Per TI's Pin Configuration documentation, it must be left floating or tied to pin 2 (cathode) - never driven or used as a feedback node, as this would violate the fixed-reference topology.
Can LM4051BIM3-1.2/NOPB replace LM4050BIM3-1.2 in existing designs?
Yes - the LM4051BIM3-1.2/NOPB is a direct functional and pin-compatible upgrade to the LM4050BIM3-1.2, offering improved 50 ppm/°C tempco (vs. 100 ppm/°C), lower 20 μVrms noise (vs. 40 μVrms), and enhanced capacitive-load tolerance, with identical SOT-23-3 footprint and electrical interface.
LM4051BIM3-1.2/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
LM4051BIM3-1.2/NOPB FAQ
1.How can I place an order for LM4051BIM3-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3-1.2/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 LM4051BIM3-1.2/NOPB reliable?
The price and inventory of LM4051BIM3-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BIM3-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM4051BIM3-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIM3-1.2/NOPB?
LM4051BIM3-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3-1.2/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 LM4051BIM3-1.2/NOPB?
For technical support, including LM4051BIM3-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3-1.2/NOPB requirements.
6.How does Aetrix verify that LM4051BIM3-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3-1.2/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 LM4051BIM3-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM4051BIM3-1.2/NOPB?
All LM4051BIM3-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3-1.2/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 LM4051BIM3-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM4051BIM3-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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