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Texas Instruments TL4051CQDBZR
- Part No.:
- TL4051CQDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL4051CQDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,007
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Product details
Overview
TL4051CQDBZR from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225V output, ±0.5% initial accuracy (C 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 automotive electronics, energy metering, and portable instrumentation where low drift and minimal power consumption are critical.
For engineers reviewing the TL4051CQDBZR datasheet, TL4051CQDBZR pinout, TL4051CQDBZR application, or TL4051CQDBZR equivalent, this page delivers verified specifications, SOT-23-3 terminal mapping, real-world use cases in high-EMI automotive systems and battery-powered meters, and two validated alternative parts with documented performance trade-offs.
Technical Context
The TL4051CQDBZR implements a bandgap-based shunt reference architecture optimized for low quiescent current and high stability under varying load and temperature conditions. Its internal feedback loop maintains regulation without external capacitors, and its dynamic impedance remains ≤0.5Ω at 1mA (f = 120Hz).
Designed for extended-temperature automotive and industrial applications, it features guaranteed operation up to 125°C ambient, thermal hysteresis of 0.36mV/V over –40°C to 125°C cycling, and ESD robustness of ±2000V HBM - enabling direct integration into harsh-environment signal chains without additional protection circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225V nominal; enables direct replacement of legacy 1.2V references with tighter tolerance and lower drift. |
| Initial Accuracy | ±0.5% max at 25°C (C grade); ensures system-level calibration validity without per-unit trimming in cost-sensitive designs. |
| Temp Coefficient | ±50ppm/°C max over –40°C to 125°C; supports <±2.5mV total drift across full automotive temperature range. |
| Noise (10Hz–10kHz) | 20μVRMS typical; preserves SNR in 16-bit+ data acquisition front-ends without added filtering. |
| Cathode Current Range | 60μA to 12mA typical; allows biasing from ultra-low-power microcontrollers or high-current analog stages without redesign. |
| Dynamic Impedance | 0.5Ω at 1mA, 120Hz; minimizes output voltage perturbation during fast load transients in precision ADC reference rails. |
| Long-Term Stability | 120ppm after 1000h; reduces recalibration frequency in field-deployed energy meters and process controllers. |
Pinout & Package
SOT-23-3 package (DBZ) with 1.0mm × 1.4mm footprint, 0.95mm height, and gull-wing leads compatible with standard reflow profiles (MSL Level-1, 260°C peak). Thermal resistance θJA = 206°C/W enables >100mW dissipation at 85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Regulated output node | Connects to load and external current-setting resistor; sinks all reference and load current; reverse-biased during regulation. |
| Anode | Reference ground return | Common return path for cathode current; must be tied to system ground; no internal connection to feedback node. |
| NC / Feedback (Adj only) | No-connect (fixed version) | Pin 3 is unconnected in TL4051CQDBZR (fixed 1.225V); parasitic Schottky diode between pins 2–3 requires pin 3 to remain floating or tied to pin 2. |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load (0–∞), eliminating BOM cost and board space for bypass caps in space-constrained modules. |
| Ultra-low minimum cathode current | 60μA typical (65μA max over temp); enables operation from weak bias sources like high-value resistors or leakage-limited nodes. |
| Low thermal hysteresis | 0.36mV/V over –40°C ↔ 125°C cycling; prevents offset shift after thermal shock in engine control units and outdoor sensors. |
| High ESD immunity | ±2000V HBM rating; withstands handling and assembly without special ESD controls in production environments. |
| Wide operating current range | 60μA–12mA span accommodates both microamp-level sensor excitation and milliamp-level DAC reference buffering in one device. |
Applications
| Automotive Battery Monitoring | Smart Energy Metering |
|---|---|
|
Use Scenario: Real-time cell voltage measurement in 12V lead-acid and 48V mild-hybrid battery management systems under engine cranking and load dump conditions. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225V基准 for 16-bit SAR ADCs sampling battery voltage and current sense amplifiers. Use Value: ±0.5% initial accuracy and ±50ppm/°C drift ensure <±5mV total error over –40°C to 125°C, meeting ISO 16750-4 transient immunity requirements. |
Use Scenario: High-accuracy voltage scaling in Class 0.2 polyphase electricity meters operating continuously for 15+ years. IC Role / Device Role / Timing Role: Primary voltage reference for metrology-grade ADCs converting mains voltage and current waveforms. Use Value: 120ppm long-term stability and 20μVRMS noise maintain >99.9% metering accuracy over lifetime without field recalibration. |
| Portable Precision Instrumentation | Industrial Process Controller I/O Modules |
|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by single-cell Li-ion batteries with tight discharge voltage range (3.0–4.2V). IC Role / Device Role / Timing Role: Low-power shunt reference supplying regulated 1.225V to op-amps and ADCs in battery-operated signal conditioning paths. Use Value: 60μA minimum cathode current enables operation down to 3.0V supply with >100h runtime on 500mAh cells, extending field service intervals. |
Use Scenario: Analog input/output modules in PLCs and DCS systems exposed to 4–20mA loop transients and industrial EMI. IC Role / Device Role / Timing Role: Isolated reference source for 24-bit delta-sigma ADCs digitizing thermocouple and RTD signals in noisy factory environments. Use Value: Stability with all capacitive loads and ±2000V HBM rating eliminate need for external TVS or RC filters, reducing module BOM count by 3–5 components. |
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 | Fixed 1.2V output, ±0.2% initial accuracy, 50ppm/°C, 25μVRMS noise, 50μA min cathode current, SOT-23-3. | Lower noise floor not required; tighter initial accuracy needed for factory-trimmed systems. | Select when ±0.2% accuracy is mandatory and 1.2V (vs. 1.225V) output is acceptable in existing layout. |
| LM4040C12IDBZR | Fixed 1.2V output, ±0.5% initial accuracy, 100ppm/°C, 35μVRMS noise, 60μA min cathode current, SOT-23-3. | Higher tempco and noise acceptable for non-precision industrial sensing. | Choose for cost-sensitive applications where 100ppm/°C drift and higher noise are tolerable, and TI second-source compatibility is preferred. |
Compared with TL4051CQDBZR, REF3012AIDBZR offers better accuracy but slightly higher noise and fixed 1.2V output, while LM4040C12IDBZR trades 2× temperature coefficient and 75% more noise for broader vendor availability and lower unit cost in high-volume production.
Availability
TL4051CQDBZR is available at Aetrix Electronics and suitable for automotive battery monitoring, smart energy metering, and portable instrumentation requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for TL4051CQDBZR 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 over 50 years of innovation in precision analog ICs and automotive-grade components.
The TL4051 series was designed specifically for high-stability, low-power shunt reference applications in automotive, industrial, and energy infrastructure systems where extended temperature operation and long-term reliability are non-negotiable.
FAQ
What is the maximum cathode current rating for TL4051CQDBZR?
The absolute maximum cathode current for TL4051CQDBZR is 20mA, but the recommended operating range is 60μA to 12mA. Exceeding 12mA risks exceeding the 150°C junction temperature limit under typical PCB thermal conditions, potentially degrading long-term stability. The device's 0.5Ω dynamic impedance ensures minimal voltage shift even near the 12mA upper limit, making TL4051CQDBZR suitable for moderate-current reference buffering.
Does TL4051CQDBZR require an output capacitor for stability?
No, TL4051CQDBZR does not require an output capacitor and is explicitly designed to remain stable with all capacitive loads - including 0pF. This eliminates the need for external bypass capacitors in space-constrained designs such as automotive sensor modules and handheld test equipment. If added, the capacitor introduces no phase margin risk, but provides no stability benefit beyond potential high-frequency noise filtering.
How does the TL4051CQDBZR perform in high-EMI environments like automotive engine bays?
TL4051CQDBZR maintains regulation integrity in high-EMI environments due to its inherent shunt topology, low dynamic impedance (0.5Ω), and ±2000V HBM ESD rating. TI recommends connecting pin 3 (NC) to pin 2 (Anode) in proximity to transformers or switching regulators to suppress coupling through the internal parasitic Schottky diode - a design detail confirmed in the official SLOS487A datasheet section 4 and 7.2.
What is the thermal hysteresis specification for TL4051CQDBZR?
TL4051CQDBZR exhibits 0.36mV/V thermal hysteresis over –40°C to 125°C cycling, measured as the difference between VZ at 25°C after exposure to –40°C versus VZ at 25°C after exposure to 125°C. This low hysteresis ensures repeatable reference voltage behavior during thermal cycling in automotive ECUs and outdoor industrial controllers, directly supporting ISO/IEC 17025-compliant calibration workflows.
Can TL4051CQDBZR be used as a drop-in replacement for older TL431-based references?
TL4051CQDBZR is not a drop-in replacement for TL431 due to fundamental topology differences: TL431 is a 3-terminal adjustable shunt regulator requiring external resistors, while TL4051CQDBZR is a 2-terminal fixed 1.225V shunt reference with no feedback pin. Replacing TL431 requires circuit redesign - specifically removing the resistor divider and recalculating the cathode current-setting resistor - but TL4051CQDBZR delivers superior accuracy, lower noise, and guaranteed extended-temperature operation where the 1.225V output is acceptable.
TL4051CQDBZR 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:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.212V
- Voltage - Output (Max):
- 10 V
- Current - Output:
- 12 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 20µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 75 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL4051CQDBZR FAQ
1.How can I place an order for TL4051CQDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051CQDBZR 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 TL4051CQDBZR reliable?
The price and inventory of TL4051CQDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051CQDBZR is usually 5 days.
3.What payment methods are accepted for TL4051CQDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL4051CQDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL4051CQDBZR?
TL4051CQDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051CQDBZR 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 TL4051CQDBZR?
For technical support, including TL4051CQDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051CQDBZR requirements.
6.How does Aetrix verify that TL4051CQDBZR is sourced from the original manufacturer or authorized distributors?
All TL4051CQDBZR 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 TL4051CQDBZR meets industry standards.
7.What is the process for return or replacement of TL4051CQDBZR?
All TL4051CQDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL4051CQDBZR, 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 TL4051CQDBZR part is unused and in its original packaging.
Return procedure for TL4051CQDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL4051CQDBZR Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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