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Analog Devices Inc./Maxim Integrated LM4051BIM3-1.2+
- Part No.:
- LM4051BIM3-1.2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3-1.2+.pdf
- Description:
- PRECISION MICROPOWER SHUNT VREF
- Quantity:
- Payment:
- Shipping:
Inventory:1,729
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Product details
Overview
LM4051BIM3-1.2+ 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 ±0.1% initial tolerance (A-grade), 50 ppm/°C max temperature coefficient, and 20 μVrms (10 Hz–10 kHz) output noise. It operates from 60 μA to 12 mA over −40°C to +125°C and requires no output capacitor-ideal for low-power sensor biasing and ADC reference in portable instrumentation.
For engineers reviewing the LM4051BIM3-1.2+ datasheet, LM4051BIM3-1.2+ pinout, LM4051BIM3-1.2+ application, or LM4051BIM3-1.2+ equivalent, key selection criteria include its guaranteed 1.225 V output at 100 μA, ultra-low quiescent current capability, stability with capacitive loads, industrial/extended temperature grade validation, and SOT-23 footprint compatibility for space-constrained PCBs.
Technical Context
The LM4051BIM3-1.2+ implements a curvature-corrected bandgap shunt architecture with internal zener-zap and fuse trimming for ±0.1% accuracy at 25°C. Its cathode-anode configuration functions as a two-terminal programmable Zener, regulating by shunting excess current to ground while maintaining stable output under varying load and input conditions.
It supports closed-loop operation only (no adjustable feedback), with pin 3 internally connected to the anode and requiring either floating or connection to pin 2 per TI's DBZ package specification. Thermal hysteresis is limited to 0.36 mV/V across −40°C to +125°C cycling, and dynamic impedance remains ≤0.5 Ω at 120 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.225 V nominal; fixed value trimmed at wafer sort-enables direct replacement of 1.2 V references without resistor network recalibration. |
| Initial Tolerance | ±0.1% at 25°C (A-grade); ensures <±1.23 mV absolute error in precision 12-bit+ ADC reference applications. |
| Tempco | 50 ppm/°C max (−40°C to +125°C); contributes ≤±6.5 mV drift over full range-critical for battery-powered field instruments. |
| Operating Current | 60 μA min / 12 mA max; allows operation from microcontroller GPIO-driven bias networks or high-current shunt regulators. |
| Output Noise | 20 μVrms (10 Hz–10 kHz); low enough to support 16-bit SAR ADCs without additional filtering. |
| Dynamic Impedance | 0.5 Ω at 120 Hz; maintains regulation stability during fast load transients in data acquisition front-ends. |
| Long-Term Stability | 120 ppm over 1000 hrs; supports calibration-critical medical and test equipment with multi-year service intervals. |
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 be tied to system ground or low-impedance reference plane. |
| Cathode (Pin 1) | Voltage output / current sink | Regulated 1.225 V node; connects to supply rail via series resistor (RS) and sinks all excess current to maintain voltage. |
| NC / Anode Tie (Pin 3) | No-connect or anode tie | Internally connected to Pin 2; must be left floating or shorted to Pin 2-never driven or loaded externally. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables single-component reference design in ultra-thin wearables and implantable sensors where board space is <3 mm². |
| Tolerates capacitive loads | Stable with >100 nF output capacitance-supports direct buffering into op-amp inputs or ADC sample-and-hold stages. |
| 60 μA minimum operating current | Allows biasing from high-value resistors (e.g., 1 MΩ @ 1.3 V), reducing power in always-on IoT endpoint nodes. |
| Sub-miniature SOT-23 package | 3.0 × 1.3 mm footprint matches industry-standard passive placement equipment-no special assembly process needed. |
| Guaranteed 50 ppm/°C tempco | Eliminates need for external temperature compensation in portable multimeters and handheld analyzers. |
Applications
| Portable Data Loggers | Medical Sensor Front-Ends |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and gas concentration every 5 seconds. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for 16-bit sigma-delta ADC converting analog sensor outputs. Use Value: Enables ±0.05% measurement accuracy over −20°C to +60°C ambient without recalibration, extending field deployment intervals. | Use Scenario: Disposable ECG patch measuring microvolt-level biopotentials with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Supplies low-noise reference to instrumentation amplifier and ADC, rejecting supply ripple from coin-cell source. Use Value: 20 μVrms noise floor preserves signal integrity below 10 μV differential input-critical for detecting ST-segment anomalies. |
| Industrial Process Transmitters | Automotive Cabin Air Quality Modules |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in factory environments from −40°C to +85°C. IC Role / Device Role / Timing Role: Sets precise zero-point and span reference for DAC-controlled current output stage. Use Value: 50 ppm/°C tempco ensures <±0.1% full-scale error across temperature-meets SIL-2 functional safety margin requirements. | Use Scenario: In-cabin CO₂ and VOC sensor module powered from 12 V vehicle bus with LDO pre-regulation. IC Role / Device Role / Timing Role: Supplies regulated bias to NDIR photodetector and reference to ratiometric gas concentration calculation. Use Value: Stable 1.225 V output enables <±2% gas concentration accuracy despite engine-off battery voltage sag to 9 V. |
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 fixed output; 2% initial tolerance; higher 600 μA min operating current | Requires resistor divider to scale down to 1.225 V-adds error, noise, and board area | Select when cost sensitivity outweighs precision and when 2.5 V reference suffices for downstream circuitry. |
| MAX6126AASA+T | 1.25 V output; 0.02% initial tolerance; 3 ppm/°C tempco; SO-8 package | Higher precision but larger footprint and 10× cost; requires bypass capacitor | Select for metrology-grade applications where 0.02% accuracy justifies SO-8 layout and BOM cost increase. |
Compared with TL431ACDBVR and MAX6126AASA+T, the LM4051BIM3-1.2+ uniquely balances A-grade 0.1% tolerance, SOT-23 size, capacitor-free operation, and 60 μA minimum current-making it optimal for space- and power-constrained 1.2 V reference needs where mid-tier precision is sufficient.
Availability
LM4051BIM3-1.2+ is available at Aetrix Electronics and suitable for portable instrumentation, medical sensor modules, and industrial process transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4051BIM3-1.2+ 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 90 years of innovation in precision analog ICs.
The LM4051-N product line delivers micropower shunt voltage references optimized for space-constrained, battery-operated systems requiring high initial accuracy and low temperature drift-targeting instrumentation, medical, and industrial sensing applications.
FAQ
What is the exact output voltage of LM4051BIM3-1.2+ and how is it trimmed?
The LM4051BIM3-1.2+ delivers a nominal 1.225 V reverse breakdown voltage, trimmed during wafer sort using zener-zap and fuse techniques to achieve ±0.1% initial tolerance (A-grade) at 25°C. This value is specified in TI's SNOS491D datasheet Section 6.5 and verified across production lots-not a nominal or typical value, but a guaranteed limit.
Does LM4051BIM3-1.2+ require an external capacitor for stability?
No, the LM4051BIM3-1.2+ does not require an external output capacitor for stability due to its advanced curvature-corrected bandgap design. It remains stable with any capacitive load-including 100 nF ceramic bypass caps on the cathode-making it ideal for direct connection to ADC reference inputs or op-amp bias networks without added components.
What is the function of Pin 3 on LM4051BIM3-1.2+ and how must it be connected?
Pin 3 of the LM4051BIM3-1.2+ is internally connected to the anode (Pin 2) and serves as a no-connect or optional anode tie point. Per TI's DBZ package specification, it must be left floating or shorted to Pin 2-never driven, loaded, or used as a separate terminal. Incorrect connection risks regulation instability or device damage.
Can LM4051BIM3-1.2+ operate across automotive temperature ranges?
Yes, the LM4051BIM3-1.2+ is rated for extended temperature operation from −40°C to +125°C, with guaranteed 50 ppm/°C max temperature coefficient and ±5.2 mV overtemperature tolerance (A-grade). It meets requirements for under-hood and cabin modules, though not AEC-Q200 qualified-system-level qualification is required for automotive safety-critical use.
How does LM4051BIM3-1.2+ compare to LM4040 in terms of noise and current consumption?
The LM4051BIM3-1.2+ offers identical 20 μVrms (10 Hz–10 kHz) noise performance to LM4040C but achieves it at lower minimum current: 60 μA vs. LM4040C's 65 μA. Both share 50 ppm/°C tempco, but LM4051BIM3-1.2+ adds superior capacitive-load tolerance and eliminates need for output capacitor-key advantages in ultra-low-power designs.
LM4051BIM3-1.2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.225V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM4051BIM3-1.2+ FAQ
1.How can I place an order for LM4051BIM3-1.2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3-1.2+ 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 LM4051BIM3-1.2+ reliable?
The price and inventory of LM4051BIM3-1.2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4051BIM3-1.2+ is usually 5 days.
3.What payment methods are accepted for LM4051BIM3-1.2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3-1.2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIM3-1.2+?
LM4051BIM3-1.2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3-1.2+ 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 LM4051BIM3-1.2+?
For technical support, including LM4051BIM3-1.2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3-1.2+ requirements.
6.How does Aetrix verify that LM4051BIM3-1.2+ is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3-1.2+ 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 LM4051BIM3-1.2+ meets industry standards.
7.What is the process for return or replacement of LM4051BIM3-1.2+?
All LM4051BIM3-1.2+ units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3-1.2+, 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 LM4051BIM3-1.2+ part is unused and in its original packaging.
Return procedure for LM4051BIM3-1.2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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