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Texas Instruments LM4051BIM3X-1.2
- Part No.:
- LM4051BIM3X-1.2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM4051BIM3X-1.2.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,211
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Product details
Overview
LM4051BIM3X-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 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 LM4051BIM3X-1.2 datasheet, LM4051BIM3X-1.2 pinout, LM4051BIM3X-1.2 application, or LM4051BIM3X-1.2 equivalent, key selection criteria include output stability under capacitive loads, no-output-capacitor operation, thermal hysteresis ≤0.36 mV/V, minimum operating current of 60 μA at full temperature range, and SOT-23 footprint compatibility with space-constrained portable and medical systems.
Technical Context
The LM4051BIM3X-1.2 functions as a curvature-corrected bandgap shunt reference, regulating by dynamically shunting excess current to ground via its cathode terminal. Its internal fuse and zener-zap trimming ensures ±0.1% accuracy at 25°C for A-grade units, 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 and tolerates any capacitive load without oscillation. Pin 3 is internally connected to the anode and must be left floating or tied to pin 2 - a critical layout constraint confirmed in TI's DBZ package documentation.
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 external feedback. |
| Initial Tolerance | ±0.1% at 25°C (A-grade) - enables single-point calibration in high-accuracy measurement systems. |
| Tempco | 50 ppm/°C max (−40°C to +125°C) - limits drift to ±6.5 mV over full extended range, supporting stable operation in automotive and industrial environments. |
| Noise (10 Hz–10 kHz) | 20 μVrms - minimizes added uncertainty in 16-bit+ data acquisition front-ends. |
| Operating Current Range | 60 μA to 12 mA - supports ultra-low-power battery operation while maintaining regulation under dynamic load conditions. |
| Dynamic Impedance | 0.5 Ω at 1 mA / 120 Hz - ensures minimal output voltage shift during transient load changes. |
| Long-Term Stability | 120 ppm over 1000 hours - reduces calibration drift in deployed instrumentation and medical devices. |
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 connected to system ground or low-impedance reference plane. |
| Cathode (Pin 1) | Shunt current input / regulated output | Accepts input current via RS; delivers stable 1.225 V relative to anode - serves as precision voltage source or clamp reference. |
| NC / Anode Tie (Pin 3) | No-connect (internally tied to anode) | Must be left floating or externally connected to pin 2; not a functional signal pin - incorrect routing causes layout errors. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Enables direct integration into space-limited PCBs (e.g., wearable sensors) without stability-compromising bypass components. |
| Tolerates capacitive loads | Eliminates need for isolation resistors or ferrite beads when driving ADC input caps or long traces - simplifies layout and reduces BOM count. |
| Reverse breakdown voltage option: 1.225 V | Matches common low-voltage rail thresholds (e.g., 1.2 V FPGA I/O, 1.25 V SAR ADC references) without resistor dividers or level-shifting overhead. |
| 60 μA minimum operating current | Supports >1-year battery life in coin-cell-powered IoT nodes (e.g., 220 mAh CR2032 at 60 μA ≈ 4.2 years theoretical runtime). |
| Thermal hysteresis ≤0.36 mV/V | Ensures repeatable voltage output after thermal cycling - critical for field-deployed test equipment and calibration standards. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor (CGM) analog front-end conditioning low-level amperometric sensor signals. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225 V bias for transimpedance amplifier and 16-bit delta-sigma ADC reference input. Use Value: 20 μVrms noise and ±0.1% tolerance enable sub-1% total measurement error across 0–50°C ambient range. |
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure over multi-year deployments. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric sensor excitation and ADC reference in ultra-low-power sleep/wake cycles. Use Value: 60 μA min operating current allows operation from harvested energy or primary lithium cells without active regulation overhead. |
| Automotive Cabin Sensors | Energy Metering IC Calibration |
Use Scenario: Occupancy detection module using infrared thermopile array in vehicle cabin, requiring stable bias across −40°C to +85°C. IC Role / Device Role / Timing Role: Fixed 1.225 V shunt reference supplying reference voltage to signal-conditioning op-amps and SAR ADCs. Use Value: 50 ppm/°C tempco ensures <±7 mV drift over full automotive temperature range - within 0.6% of full-scale 1.225 V output. |
Use Scenario: Class 0.2 polyphase electricity meter requiring traceable voltage reference for metrology ADC calibration. IC Role / Device Role / Timing Role: Primary shunt reference used during factory calibration to establish absolute voltage scale for current/voltage channel gain matching. Use Value: 120 ppm long-term stability and ±0.1% initial tolerance reduce annual recalibration frequency and support ANSI C12.20 compliance. |
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 | Adjustable 2.5 V reference (2.495–36 V via resistors); higher 100 μA min current; 2% initial tolerance; SO-8 package. | Requires external resistors for 1.225 V setting; unsuitable for space-constrained designs due to larger footprint and higher quiescent current. | Select only if adjustable output or higher voltage capability is needed; not a drop-in replacement for LM4051BIM3X-1.2. |
| MAX6126AASA+ | 1.25 V series reference; 0.04% initial accuracy; 3 ppm/°C tempco; SO-8 package; requires output capacitor. | Higher accuracy and lower drift, but demands external 1 μF capacitor and cannot operate below 100 μA - incompatible with ultra-low-power use cases. | Prefer for metrology-grade applications where board area and power budget allow; not suitable for battery lifetime-critical designs. |
Compared with TL431ACDBVR and MAX6126AASA+, the LM4051BIM3X-1.2 uniquely combines fixed 1.225 V output, 60 μA minimum current, no-output-capacitor operation, and SOT-23 footprint - making it the only viable choice for miniaturized, micropower, single-voltage-reference systems.
Availability
LM4051BIM3X-1.2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and automotive cabin sensors requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LM4051BIM3X-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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of heritage in precision reference design.
The LM4051-N product line was engineered specifically for space-constrained, low-power, high-accuracy applications - delivering micropower shunt references with industry-leading initial tolerance, tempco, and noise performance in sub-miniature SOT-23 packages.
FAQ
What is the exact output voltage and tolerance of the LM4051BIM3X-1.2?
The LM4051BIM3X-1.2 provides a fixed reverse breakdown voltage of 1.225 V with ±0.1% initial tolerance at 25°C (A-grade specification). This tolerance is verified per TI's production test flow and remains within ±5.2 mV over the industrial temperature range (−40°C to +85°C), calculated using its guaranteed 50 ppm/°C temperature coefficient.
Does the LM4051BIM3X-1.2 require an output capacitor for stability?
No, the LM4051BIM3X-1.2 does not require an output capacitor - its advanced curvature-corrected bandgap architecture ensures inherent stability with any capacitive load. This eliminates BOM cost and PCB area overhead, distinguishing it from most competing shunt and series references that mandate external capacitance for phase margin control.
What are the absolute maximum ratings for operating current in the LM4051BIM3X-1.2?
The LM4051BIM3X-1.2 has an absolute maximum reverse current rating of 20 mA, but its recommended operating current range is 60 μA to 12 mA. Exceeding 12 mA risks exceeding the 280 mW power dissipation limit in the SOT-23 package at 25°C ambient, potentially triggering thermal shutdown or long-term reliability degradation.
How is pin 3 used on the LM4051BIM3X-1.2 in the SOT-23 package?
Pin 3 of the LM4051BIM3X-1.2 is internally connected to the anode (pin 2) and is designated NC (no-connect). Per TI's DBZ package documentation, it must either be left floating or explicitly tied to pin 2 - never driven or loaded - to avoid unintended current paths or measurement errors in precision applications.
Can the LM4051BIM3X-1.2 be used in automotive applications requiring AEC-Q200 qualification?
The LM4051BIM3X-1.2 is not AEC-Q200 qualified. While it operates across −40°C to +125°C and meets key electrical specs for automotive cabin sensors, TI does not list it in their AEC-Q200-qualified portfolio. For production automotive ECUs, designers must select AEC-Q200-certified alternatives such as the LM4040-Q1 series, even though the LM4051BIM3X-1.2 shares identical electrical behavior in non-qualified contexts.
LM4051BIM3X-1.2 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4051BIM3X-1.2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4051BIM3X-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 LM4051BIM3X-1.2 reliable?
The price and inventory of LM4051BIM3X-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 LM4051BIM3X-1.2 is usually 5 days.
3.What payment methods are accepted for LM4051BIM3X-1.2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4051BIM3X-1.2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4051BIM3X-1.2?
LM4051BIM3X-1.2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4051BIM3X-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 LM4051BIM3X-1.2?
For technical support, including LM4051BIM3X-1.2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4051BIM3X-1.2 requirements.
6.How does Aetrix verify that LM4051BIM3X-1.2 is sourced from the original manufacturer or authorized distributors?
All LM4051BIM3X-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 LM4051BIM3X-1.2 meets industry standards.
7.What is the process for return or replacement of LM4051BIM3X-1.2?
All LM4051BIM3X-1.2 units undergo pre-shipment inspection (PSI). If there is an issue with LM4051BIM3X-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 LM4051BIM3X-1.2 part is unused and in its original packaging.
Return procedure for LM4051BIM3X-1.2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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