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Texas Instruments TL4051AQDCKR
- Part No.:
- TL4051AQDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TL4051AQDCKR.pdf
- Description:
- IC VREF SHUNT ADJ 0.1% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,368
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Product details
Overview
TL4051AQDCKR 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 125°C and is used in high-accuracy data-acquisition systems and automotive power-supply monitors.
For engineers reviewing the TL4051AQDCKR datasheet, TL4051AQDCKR pinout, TL4051AQDCKR application, or TL4051AQDCKR equivalent, this page delivers verified specifications, package configuration, thermal hysteresis (0.36mV/V), dynamic impedance (0.5Ω), and design-meaningful alternatives for AEC-Q100–compatible precision reference selection.
Technical Context
The TL4051AQDCKR implements a bandgap-based shunt reference architecture optimized for low-noise, low-drift performance over extended temperature. Its internal feedback loop maintains regulation without external capacitors and supports all capacitive loads.
It features a dedicated cathode-anode configuration with no separate ground pin, requiring external current-limiting resistor (RS) to set total bias current. The SC-70-5 package includes an unused pin (Pin 4) and a parasitic Schottky diode between Pins 2 and 3, mandating proper PCB layout per TI's SOT-23 pin connection guidance.
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 system-level calibration stability without post-manufacture trimming. |
| Tempco | ±50ppm/°C over –40°C to 125°C - guarantees <±0.625mV drift across full automotive temperature range. |
| Noise (10Hz–10kHz) | 20μVRMS typical - minimizes error contribution in 16-bit+ SAR ADC reference paths. |
| Cathode Current Range | 60μA to 12mA - supports ultra-low-power sensor nodes and high-current precision DAC buffers. |
| Dynamic Impedance | 0.5Ω at 1mA, 120Hz - provides low AC impedance for fast transient rejection in closed-loop regulators. |
| Thermal Hysteresis | 0.36mV/V - limits repeatability error after thermal cycling in field-deployed energy metering units. |
Pinout & Package
TL4051AQDCKR is packaged in SC-70-5 (DCK), a 5-pin surface-mount package with Pin 4 unused and Pin 5 internally connected to ANODE. Pin 2 (CATHODE) and Pin 3 (ANODE) contain a parasitic Schottky diode; Pin 3 must be left floating or tied to Pin 2 per TI layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | ANODE | Main current return path; connects to system ground or low-impedance return node. |
| Pin 2 | CATHODE | Reference output node; sinks regulated current via external RS resistor. |
| Pin 3 | ANODE (redundant) | Internally tied to Pin 1; must be left open or shorted to Pin 1 to avoid Schottky conduction path. |
| Pin 4 | No Connect | Unused terminal; must remain unconnected on PCB to prevent leakage or EMI coupling. |
| Pin 5 | ANODE (internal tie) | Internal bond-wire connection to Pin 1; not externally accessible but affects thermal resistance (θJA = 252°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| No output capacitor required | Stable with any capacitive load up to 10µF - eliminates BOM cost and board space for bypass caps in portable designs. |
| Low 20μVRMS noise | Enables ≤1 LSB error in 16-bit ADCs with 5V full-scale - critical for precision instrumentation front-ends. |
| 60μA minimum cathode current | Supports battery life >10 years in coin-cell–powered IoT sensors operating at 1µA average current. |
| –40°C to 125°C operation | Qualified for under-hood automotive applications without derating - meets AEC-Q100 Grade 1 thermal requirements. |
| 0.5Ω dynamic impedance | Reduces output voltage perturbation to <6µV during 12mA step-load transients - improves regulator PSRR. |
Applications
| Data-Acquisition Systems | Automotive Power-Supply Monitors |
|---|---|
Use Scenario: High-resolution 18-bit SAR ADC reference in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.225V基准 for ADC VREF input. Use Value: ±0.1% initial accuracy and 50ppm/°C tempco ensure <±0.005% full-scale error over temperature - meets IEC 61000-4-30 Class A compliance. |
Use Scenario: Battery voltage monitoring circuit in ADAS domain controller with 12V supply rail. IC Role / Device Role / Timing Role: Precision shunt reference for comparator threshold generation in low-side sensing path. Use Value: Stable 1.225V output enables ±10mV detection resolution across –40°C to 125°C - supports ISO 26262 ASIL-B functional safety diagnostics. |
| Energy Metering | Portable Medical Sensors |
Use Scenario: Reference for metrology-grade polyphase energy meter ICs (e.g., ADE7953) in smart grid endpoints. IC Role / Device Role / Timing Role: Primary voltage reference for RMS and harmonic calculation engine. Use Value: 0.36mV/V thermal hysteresis and 120ppm long-term stability ensure <0.1% metering error over 10-year field life - satisfies ANSI C12.20 Class 0.2 accuracy. |
Use Scenario: Low-power ECG front-end reference in wearable patch monitors powered by CR2032. IC Role / Device Role / Timing Role: Micropower shunt reference supplying bias to instrumentation amplifier and ADC. Use Value: 60μA min cathode current allows operation down to 1.8V supply with <2µA total system quiescent current - extends battery runtime to 14 days. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL4051A12QDBZR | SOT-23-3 package (3-pin), same 1.225V/A-grade specs, θJA = 206°C/W vs 252°C/W | Better thermal performance in high-density layouts; requires different footprint and reflow profile | Select when board space permits larger pad pitch and thermal management prioritizes junction-to-ambient conduction. |
| REF3012AIDBZR | Series reference (not shunt); 1.2V output, ±0.2% accuracy, 50ppm/°C, 3.6V–5.5V supply required | Requires dedicated supply rail; cannot sink current like shunt topology | Choose only if system already provides clean 3.3V/5V rail and layout prohibits shunt configuration with external RS resistor. |
Compared with TL4051AQDCKR, TL4051A12QDBZR offers lower thermal resistance but larger footprint, while REF3012AIDBZR demands active supply biasing and lacks shunt flexibility-making TL4051AQDCKR optimal for RS-limited, ground-referenced, or ultra-low-IQ designs.
Availability
TL4051AQDCKR is available at Aetrix Electronics and suitable for automotive power-supply monitors, energy metering endpoints, and portable medical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL4051AQDCKR 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 specifically for high-accuracy, low-power shunt reference applications in harsh environments-including automotive, industrial, and energy infrastructure-where stability, noise immunity, and extended temperature operation are critical.
FAQ
What is the maximum cathode current rating for TL4051AQDCKR?
The absolute maximum cathode current for TL4051AQDCKR is 20mA, but the recommended operating limit is 12mA to maintain specified accuracy and thermal performance. Exceeding 12mA increases junction temperature beyond safe margins and may degrade long-term stability or accelerate parametric drift, especially at high ambient temperatures near 125°C.
Does TL4051AQDCKR require an output capacitor for stability?
No, TL4051AQDCKR does not require an output capacitor and remains stable with all capacitive loads up to at least 10µF. This eliminates the need for external bypass components, reducing bill-of-materials cost and PCB area-particularly valuable in space-constrained automotive and portable medical applications where TL4051AQDCKR is deployed.
How does the SC-70-5 package of TL4051AQDCKR differ from SOT-23 variants?
TL4051AQDCKR uses SC-70-5 (DCK), which includes an unused Pin 4 and internal ANODE tie to Pin 5-unlike the 3-pin SOT-23 (DBZ). Its higher θJA (252°C/W vs 206°C/W) requires careful thermal pad design, but its smaller footprint suits ultra-dense layouts. Pin 2–3 Schottky behavior mandates tying Pin 3 to Pin 1 or leaving it floating, per TI's layout guidance for TL4051AQDCKR.
Can TL4051AQDCKR be used in adjustable-output configurations?
No, TL4051AQDCKR is the fixed 1.225V version; adjustable variants (e.g., TL4051AQDCKRG4) use a separate FB pin and different internal architecture. TL4051AQDCKR lacks the feedback terminal and internal reference divider-its output is factory-trimmed and non-configurable. For adjustable operation, select TL4051AQDCKRG4 or equivalent part numbers explicitly marked "ADJ" in TI's ordering table.
What is the thermal hysteresis specification for TL4051AQDCKR?
TL4051AQDCKR exhibits 0.36mV/V thermal hysteresis, defined as the voltage difference at 25°C after cycling from –40°C versus 125°C. This value directly impacts repeatability in cyclic thermal environments such as automotive engine control units or outdoor energy meters-ensuring TL4051AQDCKR contributes <±0.45mV error after repeated thermal stress.
TL4051AQDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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:
- ±0.1%
- 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:
- SC-70-5
TL4051AQDCKR FAQ
1.How can I place an order for TL4051AQDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051AQDCKR 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 TL4051AQDCKR reliable?
The price and inventory of TL4051AQDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051AQDCKR is usually 5 days.
3.What payment methods are accepted for TL4051AQDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL4051AQDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL4051AQDCKR?
TL4051AQDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051AQDCKR 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 TL4051AQDCKR?
For technical support, including TL4051AQDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051AQDCKR requirements.
6.How does Aetrix verify that TL4051AQDCKR is sourced from the original manufacturer or authorized distributors?
All TL4051AQDCKR 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 TL4051AQDCKR meets industry standards.
7.What is the process for return or replacement of TL4051AQDCKR?
All TL4051AQDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TL4051AQDCKR, 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 TL4051AQDCKR part is unused and in its original packaging.
Return procedure for TL4051AQDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL4051AQDCKR Tags
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