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Texas Instruments TL4051B12QDBZR
- Part No.:
- TL4051B12QDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL4051B12QDBZR.pdf
- Description:
- IC VREF SHUNT 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
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Product details
Overview
TL4051B12QDBZR from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225 V output, ±0.2% initial accuracy (B grade), 50 ppm/°C temperature coefficient, 20 μVRMS wideband noise, and stable operation from 60 μA to 12 mA cathode current. It operates across –40°C to +125°C and is used in high-accuracy data acquisition, battery-powered instrumentation, and automotive power-supply monitoring.
For engineers reviewing the TL4051B12QDBZR datasheet, TL4051B12QDBZR pinout, TL4051B12QDBZR application, or TL4051B12QDBZR equivalent, key selection criteria include extended-temperature-grade shunt reference performance, low-noise stability under capacitive loads, minimal bias current requirements, and SOT-23-3 package compatibility for space-constrained analog signal chains.
Technical Context
The TL4051B12QDBZR implements a bandgap-based shunt reference architecture optimized for micropower operation and thermal stability. Its internal circuitry maintains regulation via feedback between cathode and anode terminals without requiring external compensation components.
It delivers fixed 1.225 V output with guaranteed performance over –40°C to +125°C ambient, supports cathode currents as low as 60 μA (typical), exhibits 0.5 Ω dynamic impedance at 1 mA, and achieves ±50 ppm/°C max temperature coefficient across full operating range - all while remaining stable with any capacitive load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V at 100 μA cathode current; enables precise ADC/DAC biasing and sensor excitation without external resistors. |
| Initial Accuracy | ±0.2% max at 25°C (B grade); ensures system-level calibration tolerance without post-manufacture trimming. |
| Temp Coefficient | ±50 ppm/°C max over –40°C to +125°C; maintains <±0.62 mV drift across full industrial+ automotive temperature range. |
| Noise (10 Hz–10 kHz) | 20 μVRMS typical; minimizes quantization error in 16-bit+ data acquisition systems. |
| Cathode Current Range | 60 μA (typ) to 12 mA; supports ultra-low-power sensor nodes and robust regulation in high-current supply monitors. |
| Dynamic Impedance | 0.5 Ω at 1 mA, 120 Hz; provides tight output regulation despite load transients in precision power rails. |
| Long-Term Stability | 120 ppm after 1000 h; ensures reference integrity over multi-year deployment in metering and control systems. |
Pinout & Package
SOT-23-3 package (DBZ), 3-pin surface-mount, 1.0 mm × 1.4 mm footprint, 0.95 mm height, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Regulated output node | Connects to load or feedback network; sinks current to maintain 1.225 V relative to anode; reverse breakdown terminal. |
| Anode | Reference ground node | Common return path for cathode current; must be tied to system ground or lowest potential point in shunt configuration. |
| NC / Feedback (adj only) | No-connect (fixed version) | Not internally connected in TL4051B12QDBZR; left unconnected per datasheet; parasitic Schottky diode exists between pins 2 and 3 in SOT-23. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output bypass capacitor - reduces BOM count and PCB area in compact designs. |
| Low 60 μA min cathode current | Enables operation from weak sources (e.g., high-impedance dividers, energy harvesters) without dropout. |
| Extended temperature range | Rated for –40°C to +125°C ambient; qualified for under-hood automotive and industrial control environments. |
| Low 20 μVRMS noise | Preserves SNR in precision measurement front-ends where reference noise directly limits resolution. |
| 0.5 Ω dynamic impedance | Maintains output regulation during fast load steps - critical for multiplexed ADC references and closed-loop sensors. |
Applications
| Energy Metering | Automotive Power Monitoring |
|---|---|
|
Use Scenario: High-accuracy polyphase electricity meter measuring active/reactive power with >0.1% class compliance. IC Role / Device Role / Timing Role: Shunt voltage reference for 24-bit sigma-delta ADC input stage and metrology SoC internal reference. Use Value: ±0.2% initial accuracy and ±50 ppm/°C TC ensure long-term meter calibration stability across seasonal temperature swings. |
Use Scenario: Onboard diagnostics module monitoring 12 V battery health and alternator output in ADAS ECUs. IC Role / Device Role / Timing Role: Precision reference for analog front-end measuring battery voltage, current, and temperature. Use Value: Stable 1.225 V output at –40°C to +125°C enables reliable fault detection across engine bay thermal extremes. |
| Portable Instrumentation | Industrial Process Transmitter |
|
Use Scenario: Handheld multimeter with autoranging, true RMS, and 5½-digit display powered by Li-ion battery. IC Role / Device Role / Timing Role: Low-noise reference for dual-slope or SAR ADC converting measured voltage/current/resistance. Use Value: 20 μVRMS noise and 60 μA min current extend battery life while preserving measurement resolution. |
Use Scenario: 4–20 mA loop-powered pressure transmitter deployed in oil/gas refineries with ambient temps up to 85°C. IC Role / Device Role / Timing Role: Reference for DAC generating loop current and for sensor bridge excitation. Use Value: Micropower operation allows full functionality within 3.5 mA loop budget; thermal hysteresis <0.36 mV/V prevents calibration drift after thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4051B12IDBZR | Same electrical specs but rated for –40°C to +85°C industrial range; lower thermal qualification. | Not suitable for under-hood automotive or high-temp industrial enclosures exceeding 85°C ambient. | Select TL4051B12QDBZR when operation above 85°C ambient is required; otherwise TL4051B12IDBZR offers cost advantage. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial accuracy, but higher 50 μA min current and 35 μVRMS noise; SC70-3 package. | Larger noise and higher minimum current reduce suitability in ultra-low-power or high-resolution metrology. | Choose TL4051B12QDBZR for lower noise and wider current range; REF3012AIDBZR may be preferred if SC70-3 layout reuse is critical. |
Compared with TL4051B12IDBZR, TL4051B12QDBZR adds extended-temperature capability without sacrificing accuracy or noise; versus REF3012AIDBZR, it delivers superior noise performance and lower minimum operating current in identical SOT-23-3 packaging.
Availability
TL4051B12QDBZR is available at Aetrix Electronics and suitable for energy metering, automotive power monitoring, and portable instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL4051B12QDBZR 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 automotive-grade components.
The TL4051 series was designed as a family of micropower shunt references targeting high-accuracy, low-drift applications in harsh thermal environments - especially data acquisition, industrial sensing, and automotive subsystems.
FAQ
What is the maximum cathode current rating for TL4051B12QDBZR?
The absolute maximum cathode current for TL4051B12QDBZR is 20 mA, but the recommended operating condition specifies a maximum of 12 mA to ensure long-term reliability and thermal stability. Exceeding 12 mA increases junction temperature and may degrade long-term stability or accelerate aging effects. The device is characterized for optimal performance within 60 μA to 12 mA.
Does TL4051B12QDBZR require an output capacitor for stability?
No, TL4051B12QDBZR does not require an output capacitor for stability. It is explicitly designed to remain stable with all capacitive loads - including direct connection to large bulk capacitance - eliminating the need for external bypass components. This simplifies design and improves reliability in space-constrained or high-reliability applications.
What is the thermal hysteresis specification for TL4051B12QDBZR?
TL4051B12QDBZR has a thermal hysteresis of 0.36 mV/V, defined as the difference in output voltage measured at 25°C after cycling to –40°C versus after cycling to +125°C. This low hysteresis ensures repeatable reference performance during repeated thermal excursions common in automotive and industrial field deployments.
Can TL4051B12QDBZR be used in adjustable-output configurations?
No, TL4051B12QDBZR is a fixed-output variant with 1.225 V nominal voltage. Adjustable versions (e.g., TL4051BQDBZR) feature a separate feedback (FB) pin and require external resistor dividers. The TL4051B12QDBZR pinout omits functional FB connectivity - pin 3 is NC - and its internal circuitry is trimmed exclusively for 1.225 V regulation.
What is the ESD rating of TL4051B12QDBZR?
TL4051B12QDBZR has a Human-Body Model (HBM) ESD rating of ±2000 V and a Charged-Device Model (CDM) rating of ±500 V. These ratings meet standard manufacturing ESD control requirements; however, TI recommends handling with appropriate precautions to prevent parametric shifts or latent failures, especially given its precision analog function.
TL4051B12QDBZR 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL4051B12QDBZR FAQ
1.How can I place an order for TL4051B12QDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051B12QDBZR 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 TL4051B12QDBZR reliable?
The price and inventory of TL4051B12QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051B12QDBZR is usually 5 days.
3.What payment methods are accepted for TL4051B12QDBZR?
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4.How is shipping managed for TL4051B12QDBZR?
TL4051B12QDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051B12QDBZR 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 TL4051B12QDBZR?
For technical support, including TL4051B12QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051B12QDBZR requirements.
6.How does Aetrix verify that TL4051B12QDBZR is sourced from the original manufacturer or authorized distributors?
All TL4051B12QDBZR 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 TL4051B12QDBZR meets industry standards.
7.What is the process for return or replacement of TL4051B12QDBZR?
All TL4051B12QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL4051B12QDBZR, 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 TL4051B12QDBZR part is unused and in its original packaging.
Return procedure for TL4051B12QDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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