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Texas Instruments TL4051CQDBZT
- Part No.:
- TL4051CQDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL4051CQDBZT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,956
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Product details
Overview
TL4051CQDBZT 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 operation across –40°C to 125°C. It serves as a stable voltage reference in high-accuracy data acquisition, battery-powered instrumentation, and automotive power-supply monitors where low quiescent current and capacitive-load stability are critical.
For engineers reviewing the TL4051CQDBZT datasheet, TL4051CQDBZT pinout, TL4051CQDBZT application, or TL4051CQDBZT equivalent, key selection factors include its guaranteed 65μA minimum cathode current, 0.5Ω dynamic impedance at 1mA, thermal hysteresis of 0.36mV/V, compatibility with all capacitive loads without external bypass, and SOT-23-3 packaging for space-constrained designs.
Technical Context
The TL4051CQDBZT implements a bandgap-based shunt reference architecture optimized for micropower operation. Its internal circuit maintains regulation by sinking cathode current proportional to error between the reference node and an internal 1.212V bandgap core, enabling stable output over 60μA–12mA cathode current range and full industrial-to-extended temperature span.
Unlike series references, it requires no input capacitor and remains stable with unlimited capacitive loading on the cathode node. Its feedback terminal (FB) is internally connected only in adjustable variants; the TL4051CQDBZT is fixed-output and uses only CATHODE and ANODE terminals - eliminating external resistor divider complexity while preserving low-noise, low-drift performance.
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 | ±0.5% max (C grade) at 25°C; ensures system-level calibration drift remains under 6.1mV without trimming. |
| Temp Coefficient | ±50ppm/°C max over –40°C to 125°C; contributes ≤0.61mV total drift across full operating range. |
| Noise (10Hz–10kHz) | 20μVRMS typical; supports 16-bit+ SAR ADCs without added filtering in precision measurement front-ends. |
| Min Cathode Current | 65μA max over temperature; allows biasing from high-impedance sources like DAC outputs or microcontroller GPIOs. |
| Dynamic Impedance | 0.5Ω at 1mA, 120Hz; minimizes load-induced output variation in dynamic current-sink applications. |
| Thermal Hysteresis | 0.36mV/V over –40°C ↔ 125°C cycling; limits repeatability error in systems undergoing repeated thermal stress. |
Pinout & Package
SOT-23-3 package (DBZ) with gull-wing leads, 1.0mm pitch, 2.92mm × 1.3mm footprint, and exposed pad not electrically connected. RoHS-compliant, NIPDAU/Sn lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Reference output node and current sink terminal | Connects to regulated voltage rail; sinks all cathode current (65μA–12mA); must be decoupled only if noise sensitivity exceeds 20μVRMS. |
| ANODE | Ground reference and return path | Low-impedance connection to system ground; parasitic Schottky diode to pin 3 requires pin 3 to be left floating or tied to ANODE in SOT-23 layout. |
| NC / FB (Not Connected) | Unused terminal (no internal connection) | Pin 3 is unconnected in fixed-output TL4051CQDBZT; must remain floating or tied to ANODE per TI layout guidance to avoid leakage paths. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-load stability | No output capacitor required; stable with ≥0pF to ≥100μF loads - eliminates BOM cost and board area for bypass caps in portable designs. |
| Micropower operation | 65μA max minimum cathode current enables use with ultra-low-power microcontrollers and energy-harvesting sources. |
| Extended temperature range | Rated for –40°C to 125°C ambient; qualified for under-hood automotive and industrial control environments without derating. |
| Low dynamic impedance | 0.5Ω at 1mA enables <1mV output shift under 500μA load transients - critical for high-speed ADC reference buffering. |
| Low long-term drift | 120ppm shift after 1000h at 25°C; reduces recalibration frequency in metrology and test equipment. |
Applications
| Data-Acquisition Systems | Automotive Power-Supply Monitors |
|---|---|
Use Scenario: High-resolution 16-bit SAR ADC front-end in portable multimeters and sensor signal conditioners. IC Role / Device Role / Timing Role: Provides stable 1.225V reference for ADC VREF input, rejecting supply ripple and temperature drift. Use Value: Enables ±0.5% absolute accuracy without post-fabrication trimming, reducing test time and calibration cost. |
Use Scenario: Battery voltage monitoring and OBD-II diagnostic circuits in engine control units. IC Role / Device Role / Timing Role: Shunt reference for comparator-based undervoltage lockout and battery state-of-charge estimation. Use Value: Maintains 0.36mV/V thermal hysteresis across –40°C to 125°C, ensuring repeatable trip thresholds after thermal cycling. |
| Precision Audio Converters | Energy Metering IC Reference |
Use Scenario: Reference source for delta-sigma audio ADCs in professional recording interfaces. IC Role / Device Role / Timing Role: Low-noise (20μVRMS) voltage reference for analog input stage, minimizing quantization noise floor. Use Value: Delivers 110dB SNR contribution - directly enabling ENOB >16.5 bits without external low-noise amplification. |
Use Scenario: Reference for polyphase energy metering SoCs (e.g., TI MSP430i20xx) in smart electricity meters. IC Role / Device Role / Timing Role: Stable 1.225V reference for metrology ADCs measuring voltage/current waveforms with 0.1% billing accuracy. Use Value: ±0.5% initial tolerance and ±50ppm/°C TC meet IEC 62053-21 Class 0.2 accuracy requirements over full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4051BQDBZT | ±0.2% initial accuracy (B grade), same 50ppm/°C TC and 20μVRMS noise | Higher accuracy for mid-tier test equipment where 0.5% is insufficient but 0.1% is unnecessary | Select when tighter initial tolerance is needed without upgrading to A grade cost or sacrificing noise/TC performance. |
| REF3012AIDBZR | 1.2V output, ±0.2% accuracy, 50ppm/°C TC, 33μVRMS noise, 50μA min current | Lower noise floor not required; higher min current acceptable in non-battery applications | Choose when lower cost and TI's REF30 family support ecosystem outweigh need for 20μVRMS noise and 65μA min current. |
Compared with TL4051BQDBZT, the TL4051CQDBZT trades 0.3% initial accuracy for lower unit cost in volume production; compared with REF3012AIDBZR, it delivers 40% lower noise and 30% lower minimum operating current - critical for battery life and high-resolution measurement.
Availability
TL4051CQDBZT is available at Aetrix Electronics and suitable for precision data-acquisition systems, automotive power-supply monitors, and energy metering applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL4051CQDBZT 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TL4051 series was designed specifically for micropower, high-accuracy shunt reference applications where space, thermal stability, and capacitive-load immunity are constraints - targeting portable instrumentation, automotive subsystems, and smart grid infrastructure.
FAQ
What is the operating temperature range for TL4051CQDBZT?
The TL4051CQDBZT is characterized for operation from –40°C to +125°C ambient temperature. This extended temperature rating is confirmed in Section 5.5 of the official TI datasheet (SLOS487A) and qualifies the device for under-hood automotive, industrial control, and outdoor metering applications without thermal derating.
Does TL4051CQDBZT require an output capacitor for stability?
No, TL4051CQDBZT does not require an output capacitor. As stated in Section 7.1 and Feature list, it is stable with all capacitive loads - from 0pF up to at least 100μF - eliminating the need for external bypass components and simplifying layout in space-constrained designs.
What is the minimum cathode current required for TL4051CQDBZT regulation?
The TL4051CQDBZT requires a minimum cathode current of 65μA over its full operating temperature range (–40°C to 125°C), as specified in Table 5.5 of the datasheet. At 25°C, typical minimum current is 60μA, but design must accommodate the worst-case 65μA limit to ensure regulation across temperature extremes.
Is TL4051CQDBZT pin-compatible with other TL4051 variants in SOT-23-3?
Yes, TL4051CQDBZT shares identical SOT-23-3 (DBZ) pinout and footprint with all other TL4051xQ and TL4051xI variants in the same package - including TL4051AQDBZT and TL4051BQDBZT. Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = NC/FB (unconnected in fixed versions).
What is the thermal hysteresis specification for TL4051CQDBZT?
The TL4051CQDBZT exhibits 0.36mV/V thermal hysteresis, defined as the difference in output voltage measured at 25°C after cycling to –40°C versus after cycling to 125°C. This value is explicitly listed in Tables 5.5 and 5.7 of the TI datasheet and applies to all C-grade Q-temperature variants.
TL4051CQDBZT 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:
- ±0.5%
- 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
TL4051CQDBZT FAQ
1.How can I place an order for TL4051CQDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051CQDBZT 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 TL4051CQDBZT reliable?
The price and inventory of TL4051CQDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051CQDBZT is usually 5 days.
3.What payment methods are accepted for TL4051CQDBZT?
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4.How is shipping managed for TL4051CQDBZT?
TL4051CQDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051CQDBZT 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 TL4051CQDBZT?
For technical support, including TL4051CQDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051CQDBZT requirements.
6.How does Aetrix verify that TL4051CQDBZT is sourced from the original manufacturer or authorized distributors?
All TL4051CQDBZT 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 TL4051CQDBZT meets industry standards.
7.What is the process for return or replacement of TL4051CQDBZT?
All TL4051CQDBZT units undergo pre-shipment inspection (PSI). If there is an issue with TL4051CQDBZT, 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 TL4051CQDBZT part is unused and in its original packaging.
Return procedure for TL4051CQDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL4051CQDBZT Tags
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