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Texas Instruments TL4051BQDBZT
- Part No.:
- TL4051BQDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL4051BQDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,705
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Product details
Overview
TL4051BQDBZT from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225V output, ±0.2% initial accuracy (B grade), 50ppm/°C temperature coefficient, 20μVRMS wideband noise, and stable operation from 60μA to 12mA 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 monitors.
For engineers reviewing the TL4051BQDBZT datasheet, TL4051BQDBZT pinout, TL4051BQDBZT application, or TL4051BQDBZT equivalent, key selection criteria include its extended-temperature-grade B-grade tolerance, SOT-23-3 package compatibility, low-noise performance in portable systems, and absence of required output capacitance for stability.
Technical Context
The TL4051BQDBZT implements a bandgap-based shunt reference architecture with internal feedback control, delivering a stable 1.225V reverse breakdown voltage at cathode-to-anode terminals. Its design supports operation over full industrial and extended temperature ranges without external compensation.
It features ultra-low dynamic impedance (0.5Ω at 1mA), thermal hysteresis of 0.36mV/V, and long-term stability of 120ppm over 1000 hours - enabling reliable voltage referencing in precision analog signal chains where drift and noise must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225V reverse breakdown voltage; enables direct replacement of legacy 1.2V references with tighter tolerance. |
| Initial Accuracy | ±0.2% max at 25°C (B grade); ensures minimal calibration burden in factory-trimmed measurement systems. |
| Temp Coefficient | ±50ppm/°C max over –40°C to 125°C; maintains <±0.625mV drift across full operating range. |
| Noise (10Hz–10kHz) | 20μVRMS typical; supports high-resolution ADCs (e.g., 16-bit+ SAR or delta-sigma) without added filtering. |
| Cathode Current Range | 60μA to 12mA typical; allows use in ultra-low-power sensor nodes and high-current biasing applications. |
| Dynamic Impedance | 0.5Ω at 1mA, 120Hz; provides strong rejection of supply ripple and load-induced voltage perturbations. |
| Thermal Hysteresis | 0.36mV/V over –40°C ↔ 125°C cycling; guarantees repeatable reference voltage after thermal stress. |
Pinout & Package
SOT-23-3 package (DBZ), 2.92mm × 1.3mm footprint, 1.45mm height, surface-mount compatible with standard reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Reference output terminal (reverse-biased anode connection point) | Carries total current (IZ + IL); voltage referenced to ANODE; requires external series resistor for regulation. |
| Anode | Ground/reference return path | Must be connected to system ground or lowest potential node; defines 0V reference for VZ measurement. |
| NC / Feedback (Adjustable only) | No-connect for TL4051BQDBZT (fixed version) | Pin 3 is unused and must be left floating or tied to ANODE per TI recommendation to avoid EMI coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in space-constrained designs. |
| Low 20μVRMS noise | Enables sub-LSB accuracy in 16-bit+ data converters without post-filtering or oversampling overhead. |
| 60μA minimum cathode current | Supports operation in energy-harvesting and coin-cell-powered systems with microamp-level supply budgets. |
| Extended temperature range | –40°C to 125°C qualification enables deployment in under-hood automotive and industrial motor-control environments. |
| B-grade accuracy (±0.2%) | Offers optimal balance between cost and precision for mid-tier test equipment and process monitoring systems. |
Applications
| Portable Instrumentation | Automotive Power Monitoring |
|---|---|
Use Scenario: Handheld multimeter with 200ksps sampling and auto-ranging front-end. IC Role / Device Role / Timing Role: Shunt reference for 16-bit SAR ADC and programmable gain amplifier calibration. Use Value: ±0.2% initial accuracy and 50ppm/°C drift ensure <±0.05% full-scale error across operating temperature without recalibration. |
Use Scenario: 12V battery voltage monitor in ADAS domain controller with wake-on-voltage threshold. IC Role / Device Role / Timing Role: Precision voltage reference for comparator input and ADC-based state-of-charge estimation. Use Value: Stable 1.225V output enables accurate 0.1V resolution on 12V rail across –40°C to 125°C ambient conditions. |
| Energy Metering | Industrial Process Control |
Use Scenario: DIN-rail mounted smart electricity meter with Class 0.2 accuracy certification. IC Role / Device Role / Timing Role: Reference for metrology-grade sigma-delta ADC measuring current/voltage waveforms. Use Value: 20μVRMS noise and 120ppm long-term stability meet IEC 62053-21 requirements for 10-year field reliability. |
Use Scenario: 4–20mA loop-powered transmitter with HART communication and local display. IC Role / Device Role / Timing Role: Voltage reference for DAC output stage and sensor excitation circuitry. Use Value: Micropower operation (60μA min) extends loop compliance margin while maintaining ±0.2% output fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4051B12QDBZR | Same B-grade 1.225V fixed reference in SOT-23-3, but supplied in 3000-piece reel vs. 250-piece tape-and-reel. | Identical electrical specs and temperature rating; suited for high-volume production rather than prototyping or low-MOQ builds. | Select TL4051BQDBZT for engineering samples, small-batch validation, or when tight inventory control is required. |
| REF3012AIDBZR | 1.2V output, ±0.2% initial accuracy, 50ppm/°C, but higher 3.5μA quiescent current and 40μVRMS noise. | Limited to –40°C to 125°C, but lacks same micropower capability and noise performance; less suitable for high-resolution metrology. | Choose TL4051BQDBZT when ultra-low noise (<25μVRMS) and sub-100μA operation are mandatory for signal integrity. |
Compared with TL4051B12QDBZR and REF3012AIDBZR, TL4051BQDBZT delivers identical precision and temperature range in a smaller-order-quantity format while offering superior noise and micropower performance - making it optimal for design-in validation and low-volume precision analog systems.
Availability
TL4051BQDBZT is available at Aetrix Electronics and suitable for portable instrumentation, automotive power monitoring, and energy metering requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TL4051BQDBZT 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, embedded processing, and digital signal processing technologies.
The TL4051 series was designed specifically for precision shunt reference applications demanding micropower operation, low noise, and extended temperature reliability - targeting data acquisition, industrial sensing, and automotive subsystems.
FAQ
What is the operating temperature range of the TL4051BQDBZT?
The TL4051BQDBZT is qualified for operation from –40°C to +125°C ambient temperature, meeting extended-temperature requirements for automotive under-hood and industrial control applications. This rating is confirmed in Section 5.5 of the official TI datasheet (SLOS487A), which specifies full electrical characteristics across this range for the Q-grade variant.
Does the TL4051BQDBZT require an output capacitor for stability?
No, the TL4051BQDBZT does not require an output capacitor for stability. As stated in Section 7.1 and Feature list, it is inherently stable with all capacitive loads and functions reliably without any external bypass capacitor across cathode and anode terminals - simplifying layout and reducing component count in compact designs.
What is the minimum cathode current needed for proper regulation in TL4051BQDBZT?
The TL4051BQDBZT requires a minimum cathode current of 60μA (typical) and 65μA (max over temperature) to maintain regulation, as specified in Table 5.5 (TL4051B12Q Electrical Characteristics). Below this threshold, output voltage may deviate beyond specified tolerance limits.
Is TL4051BQDBZT pin-compatible with other TL4051 variants in SOT-23-3?
Yes, TL4051BQDBZT uses the standard SOT-23-3 (DBZ) package with identical pinout (CATHODE, ANODE, NC) as all other TL4051x12Q and TL4051x12I fixed-output variants. Pin compatibility is confirmed in Section 4 (Pin Configuration and Functions) and Package Option Addendum of the TI datasheet.
How does the noise performance of TL4051BQDBZT compare to similar shunt references?
The TL4051BQDBZT delivers 20μVRMS wideband noise (10Hz–10kHz), matching the best-in-class performance of TI's precision shunt references. This is 2× lower than REF3012 (40μVRMS) and significantly better than LM4040 (35–45μVRMS), directly supporting high-resolution ADCs without additional noise filtering.
TL4051BQDBZT 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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- 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:
- 70 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL4051BQDBZT FAQ
1.How can I place an order for TL4051BQDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051BQDBZT 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 TL4051BQDBZT reliable?
The price and inventory of TL4051BQDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051BQDBZT is usually 5 days.
3.What payment methods are accepted for TL4051BQDBZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL4051BQDBZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL4051BQDBZT?
TL4051BQDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051BQDBZT 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 TL4051BQDBZT?
For technical support, including TL4051BQDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051BQDBZT requirements.
6.How does Aetrix verify that TL4051BQDBZT is sourced from the original manufacturer or authorized distributors?
All TL4051BQDBZT 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 TL4051BQDBZT meets industry standards.
7.What is the process for return or replacement of TL4051BQDBZT?
All TL4051BQDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL4051BQDBZT, 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 TL4051BQDBZT part is unused and in its original packaging.
Return procedure for TL4051BQDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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