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Texas Instruments TL4051A12IDBZT
- Part No.:
- TL4051A12IDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL4051A12IDBZT.pdf
- Description:
- IC VREF SHUNT 0.1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
TL4051A12IDBZT from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225V output, ±0.1% initial accuracy (A grade), 50ppm/°C temperature coefficient, 20μVRMS wideband noise, and stable operation from 60μA to 12mA cathode current. It operates across –40°C to +85°C and is used in high-accuracy data acquisition, battery-powered instrumentation, and power-supply monitoring circuits.
For engineers reviewing the TL4051A12IDBZT datasheet, TL4051A12IDBZT pinout, TL4051A12IDBZT application, or TL4051A12IDBZT equivalent, key selection criteria include initial voltage tolerance, thermal drift performance, low-noise operation at microamp bias currents, and compatibility with capacitive loads without external stabilization.
Technical Context
The TL4051A12IDBZT implements a bandgap-based shunt reference architecture optimized for micropower operation. Its internal circuit maintains regulation by sinking cathode current proportional to error between actual and target output voltage, enabling precise voltage setting without series pass elements.
It features a two-terminal configuration (cathode/anode) with no feedback pin - unlike adjustable variants - and achieves stability across all capacitive loads due to inherent low dynamic impedance (0.5Ω typical at 1mA) and absence of phase-margin sensitivity. Thermal hysteresis is specified at 0.36mV/V over –40°C to 125°C cycling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225V at 100μA cathode current; enables direct replacement of legacy 1.2V references with tighter tolerance. |
| Initial Accuracy | ±0.1% max at 25°C; ensures ≤1.23mV absolute error in precision ADC reference or DAC biasing applications. |
| Tempco | ±50ppm/°C max over –40°C to +85°C; contributes ≤0.52mV drift across full industrial range, critical for uncalibrated systems. |
| Noise (10Hz–10kHz) | 20μVRMS typical; supports high-resolution (≥16-bit) analog measurements without added filtering. |
| Cathode Current Range | 60μA to 12mA typical; allows operation down to ultra-low-power sensor nodes while supporting >10mA load regulation. |
| Dynamic Impedance | 0.5Ω typical at 1mA; minimizes output voltage shift under transient load changes in regulated supply rails. |
| Long-Term Stability | 120ppm after 1000 hours; ensures reference integrity over product lifetime without recalibration. |
Pinout & Package
SOT-23-3 (DBZ) package: compact 2.92mm × 1.3mm surface-mount outline with gull-wing leads, rated for industrial temperature range (–40°C to +85°C) and RoHS-compliant lead finish (NiPdAu/Sn).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Regulated output node | Sinks current to maintain 1.225V; connects to load and current-setting resistor in shunt topology. |
| Anode | Reference ground terminal | Common return path; must be tied to system ground; defines voltage reference point for cathode. |
| NC (Pin 3) | No-connect terminal | Internally unused; must remain floating or tied to anode per TI recommendation to avoid parasitic Schottky conduction. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load up to 10µF; eliminates BOM cost and PCB area for bypass caps in space-constrained designs. |
| Micropower operation | 60μA typical minimum cathode current enables use in coin-cell-powered devices with multi-year battery life. |
| Low thermal hysteresis | 0.36mV/V over –40°C ↔ 125°C cycling; preserves calibration integrity after thermal stress in automotive or outdoor equipment. |
| High ESD robustness | ±2000V HBM rating; withstands handling and board-level assembly without special ESD controls beyond standard practices. |
| Wide operating current range | Supports both ultra-low-current sensing (60μA) and higher-current regulation (12mA) in same footprint, simplifying design reuse. |
Applications
| Portable Instrumentation | Industrial Data Acquisition |
|---|---|
Use Scenario: Handheld multimeter with 16-bit SAR ADC requiring stable reference under varying battery voltage and ambient temperature. IC Role / Device Role / Timing Role: Shunt voltage reference providing 1.225V reference for ADC conversion and internal DAC trimming. Use Value: ±0.1% initial accuracy and 50ppm/°C tempco ensure <0.01% measurement error across –10°C to +50°C operating range without software compensation. |
Use Scenario: Modular PLC analog input module measuring 4–20mA sensor signals with cold-junction compensation. IC Role / Device Role / Timing Role: Precision reference for sigma-delta ADC and thermocouple amplifier offset calibration. Use Value: 20μVRMS noise floor enables resolution below 1μV in 24-bit conversions; long-term stability avoids field recalibration. |
| Energy Metering | Battery Management Systems |
Use Scenario: DIN-rail energy meter with metrology-grade AFE requiring traceable voltage reference for revenue-grade kWh calculation. IC Role / Device Role / Timing Role: Primary shunt reference for polyphase energy measurement IC's internal ADC and RMS computation engine. Use Value: 120ppm long-term stability over 1000h ensures <0.012% gain drift over 10-year service life, meeting IEC 62053-21 Class 0.2 requirements. |
Use Scenario: Li-ion battery fuel gauge IC in medical wearable with 3.0–4.2V supply range and 10-year shelf life requirement. IC Role / Device Role / Timing Role: Reference for coulomb counter ADC and cell voltage monitoring comparators. Use Value: Stable operation down to 60μA cathode current enables continuous monitoring during deep sleep mode, extending standby time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| REF3012AIDBZR | 1.2V output, ±0.2% initial accuracy, 50ppm/°C, 3.3V to 5.5V supply-dependent operation (not shunt) | Requires external supply rail; unsuitable for floating or high-side shunt configurations | Select when system has clean 3.3V/5V rail and needs lower quiescent current (50μA); avoid if cathode must float above ground. |
| LM4040A12IDBZR | 1.225V output, ±0.1% accuracy, 100ppm/°C tempco, 75μA min cathode current, higher 35μVRMS noise | Higher thermal drift and noise limit use in >16-bit precision systems | Choose for cost-sensitive industrial sensors where ±0.5mV total drift is acceptable; verify noise impact on signal chain SNR. |
Compared with TL4051A12IDBZT, REF3012AIDBZR offers lower quiescent current but requires a dedicated supply and lacks true shunt flexibility, while LM4040A12IDBZR trades off 2× higher tempco and noise for broader vendor availability and legacy design continuity.
Availability
TL4051A12IDBZT is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition, and energy metering requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for TL4051A12IDBZT 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-reliability manufacturing.
The TL4051 series was developed for applications demanding ultra-stable, low-power voltage references in space-constrained and battery-operated systems, emphasizing micropower operation, low noise, and robust thermal performance across extended temperature ranges.
FAQ
What is the maximum cathode current rating for TL4051A12IDBZT?
The TL4051A12IDBZT has an absolute maximum cathode current rating of 20mA, but its recommended operating range is 60μA to 12mA. Operating above 12mA risks exceeding thermal limits in the SOT-23-3 package, especially at elevated ambient temperatures, and may degrade long-term stability. The device delivers optimal regulation and low dynamic impedance within the 1mA to 12mA range.
Does TL4051A12IDBZT require an output capacitor for stability?
No, TL4051A12IDBZT does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads, including ceramic, tantalum, and electrolytic types up to at least 10µF. Adding a capacitor may reduce high-frequency noise but is never necessary for loop stability - a key advantage over many competing shunt references.
How does the TL4051A12IDBZT differ from the adjustable TL4051 variants?
TL4051A12IDBZT is a fixed-output variant with 1.225V nominal voltage and no feedback (FB) pin, whereas adjustable versions (e.g., TL4051AIDBZT) include a third pin for external resistor-divider programming and a 1.212V internal reference. The fixed version eliminates external components, reduces layout sensitivity, and guarantees tighter initial tolerance without resistor tolerance contributions.
Can TL4051A12IDBZT be used in automotive applications?
TL4051A12IDBZT is qualified for industrial temperature range (–40°C to +85°C), not the extended automotive AEC-Q100 Grade 2 (–40°C to +105°C) or Grade 1 (–40°C to +125°C) ranges. For automotive cabin or engine-bay applications, TI recommends the Q-grade counterpart TL4051A12QDBZT, which is characterized and tested across –40°C to +125°C and carries appropriate qualification documentation.
What is the significance of the 'A' grade in TL4051A12IDBZT?
The 'A' grade in TL4051A12IDBZT denotes ±0.1% maximum initial output voltage tolerance at 25°C and ±50ppm/°C maximum average temperature coefficient over –40°C to +85°C. This grade provides the highest accuracy tier in the TL4051 family, making it suitable for metrology, high-end test equipment, and applications where calibration intervals must be maximized or eliminated.
TL4051A12IDBZT 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:
- ±0.1%
- 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
TL4051A12IDBZT FAQ
1.How can I place an order for TL4051A12IDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051A12IDBZT 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 TL4051A12IDBZT reliable?
The price and inventory of TL4051A12IDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051A12IDBZT is usually 5 days.
3.What payment methods are accepted for TL4051A12IDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL4051A12IDBZT transactions.
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4.How is shipping managed for TL4051A12IDBZT?
TL4051A12IDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051A12IDBZT 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 TL4051A12IDBZT?
For technical support, including TL4051A12IDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051A12IDBZT requirements.
6.How does Aetrix verify that TL4051A12IDBZT is sourced from the original manufacturer or authorized distributors?
All TL4051A12IDBZT 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 TL4051A12IDBZT meets industry standards.
7.What is the process for return or replacement of TL4051A12IDBZT?
All TL4051A12IDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL4051A12IDBZT, 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 TL4051A12IDBZT part is unused and in its original packaging.
Return procedure for TL4051A12IDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL4051A12IDBZT Tags
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