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Texas Instruments TL4051B12IDCKR
- Part No.:
- TL4051B12IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TL4051B12IDCKR.pdf
- Description:
- IC VREF SHUNT 0.2% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,425
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Product details
Overview
TL4051B12IDCKR 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 85°C and is used in high-accuracy data acquisition, battery-powered instrumentation, and power-supply monitoring circuits.
For engineers reviewing the TL4051B12IDCKR datasheet, TL4051B12IDCKR pinout, TL4051B12IDCKR application, or TL4051B12IDCKR equivalent, key selection criteria include initial voltage tolerance, thermal drift performance, low-noise operation under light-load conditions, and compatibility with capacitive loads without external stabilization.
Technical Context
The TL4051B12IDCKR functions as a two-terminal shunt reference, sinking cathode current to maintain a precise 1.225 V across its terminals. Its internal bandgap core delivers low dynamic impedance (0.5 Ω at 1 mA) and tight thermal hysteresis (0.36 mV/V), enabling stable regulation across wide current and temperature ranges.
It requires no output capacitor and remains stable with all capacitive loads - a critical advantage in space-constrained, low-power designs. The SC-70-5 package supports high-density PCB layouts while maintaining thermal performance via 252 °C/W junction-to-ambient resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225 V at 100 μA cathode current; enables direct replacement of legacy 1.2 V references with tighter tolerance. |
| Initial Accuracy | ±0.2% max at 25°C (B grade); ensures system-level calibration stability without post-manufacture trimming. |
| Temp Coefficient | ±50 ppm/°C over –40°C to 85°C; limits voltage drift to ±415 μV across full industrial range. |
| Noise (10 Hz–10 kHz) | 20 μVRMS typical at 100 μA; supports high-resolution ADCs and precision analog front-ends. |
| Cathode Current Range | 60 μA (typ) to 12 mA; allows operation in ultra-low-power sensor nodes and higher-current biasing networks. |
| Dynamic Impedance | 0.5 Ω at 1 mA, 120 Hz; minimizes load-induced voltage perturbation in dynamic current-sink applications. |
| Long-Term Stability | 120 ppm after 1000 h; reduces calibration drift in field-deployed metering and industrial control systems. |
Pinout & Package
TL4051B12IDCKR is housed in a 5-pin SC-70 package (DCK). Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is NC (no internal connection; must be left floating or tied to Anode per TI guidance), Pin 4 is NC, Pin 5 is Anode (dual-anode configuration for thermal and layout flexibility).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Current sink node | Primary terminal for setting regulated voltage; connects to supply rail via series resistor in shunt regulator topology. |
| Pin 2 (ANODE) | Reference ground return | Low-impedance return path; ties to system ground or negative rail; dual-anode design improves thermal symmetry. |
| Pin 3 (NC) | No internal connection | Must remain unconnected or tied to Pin 2; avoids parasitic Schottky conduction in SOT-23 variants (not applicable here but specified in datasheet for consistency). |
| Pin 4 (NC) | No internal connection | Unused terminal; left unconnected per SC-70 mechanical layout; no electrical function. |
| Pin 5 (ANODE) | Secondary anode terminal | Provides redundant ground path; enhances thermal dissipation and reduces package inductance in high-frequency layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output bypass capacitor - reduces BOM count and PCB area in portable and space-limited designs. |
| 20 μVRMS broadband noise | Enables <16-bit effective resolution in precision SAR ADCs without additional filtering or external low-noise buffers. |
| 60 μA minimum operating current | Supports microamp-level system sleep modes while retaining reference integrity - critical for battery lifetime in IoT sensors. |
| ±0.2% initial accuracy (B grade) | Reduces or eliminates factory calibration steps in production test, lowering manufacturing cost for mid-tier instrumentation. |
| SC-70-5 thermal performance | 252 °C/W θJA enables 12 mA operation up to 85°C ambient without derating - suitable for sealed industrial enclosures. |
Applications
| Data Acquisition Systems | Power-Supply Monitors |
|---|---|
Use Scenario: High-resolution 18-bit delta-sigma ADC front-end in portable multimeters and environmental sensors. IC Role / Device Role / Timing Role: Provides stable 1.225 V reference for ADC internal conversion and external signal conditioning. Use Value: Low 20 μVRMS noise and ±0.2% accuracy directly limit total unadjusted error (TUE), enabling single-point calibration. |
Use Scenario: Input/output voltage supervision in telecom DC-DC modules with ±1% regulation requirements. IC Role / Device Role / Timing Role: Shunt reference in comparator-based overvoltage/undervoltage detection circuitry. Use Value: Stable 1.225 V threshold with <±50 ppm/°C drift ensures trip-point consistency across –40°C to 85°C ambient. |
| Portable Instrumentation | Battery-Powered Equipment |
Use Scenario: Handheld gas analyzers requiring 10-year calibration stability and low standby power. IC Role / Device Role / Timing Role: Primary voltage reference for analog sensor signal chains and microcontroller ADC references. Use Value: 60 μA min cathode current and 120 ppm long-term drift support decade-level field recalibration intervals. |
Use Scenario: Smart water meters with lithium-thionyl chloride primary cells and 15-year service life. IC Role / Device Role / Timing Role: Precision reference for metrology-grade current sensing and pulse counting circuitry. Use Value: Micropower operation down to 60 μA preserves battery capacity; ±0.2% accuracy maintains billing-grade measurement 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 |
|---|---|---|---|
| TL4051B12IDBZR | SOT-23-3 package (3 pins), same electrical specs, higher θJA (206 °C/W), lower max current at high ambient. | Better suited for cost-sensitive, lower-power applications where PCB area is less constrained than thermal budget. | Select when board space permits larger footprint and thermal margin exceeds 206 °C/W requirement. |
| REF3012AIDBZR | 1.2 V output, ±0.2% accuracy, 50 ppm/°C, but higher 50 μVRMS noise and 50 μA min current; SOT-23-3 only. | Acceptable for non-critical 12-bit systems; unsuitable for >14-bit precision or ultra-low-noise signal chains. | Choose only if 1.2 V (vs. 1.225 V) is acceptable and noise sensitivity is relaxed. |
Compared with TL4051B12IDBZR, TL4051B12IDCKR offers superior thermal performance in compact layouts; compared with REF3012AIDBZR, it delivers 2.5× lower noise and tighter output voltage alignment to standard 1.225 V DAC/ADC reference points.
Availability
TL4051B12IDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, power-supply monitors, and portable instrumentation requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for TL4051B12IDCKR 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, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and reference design support.
The TL4051 series was developed for high-accuracy, low-power shunt reference applications in industrial, medical, and portable instrumentation - prioritizing micropower operation, low noise, and robust capacitive-load stability.
FAQ
What is the output voltage tolerance of TL4051B12IDCKR at 25°C?
The TL4051B12IDCKR has a maximum initial output voltage tolerance of ±0.2% at 25°C, corresponding to ±2.45 mV around the nominal 1.225 V output. This B-grade specification is verified across production lots and is guaranteed in the datasheet's Electrical Characteristics table under "Reverse breakdown voltage tolerance" at IZ = 100 μA.
Does TL4051B12IDCKR require an external output capacitor?
No, TL4051B12IDCKR does not require an external output capacitor. It is explicitly designed to remain stable with all capacitive loads, including direct connection to large decoupling or filtering capacitors. This eliminates the need for external components and simplifies layout in space-constrained applications.
What is the minimum cathode current needed for TL4051B12IDCKR to regulate properly?
The TL4051B12IDCKR requires a minimum cathode current of 60 μA (typical) and 65 μA (max over temperature) to maintain regulation. Below this threshold, the device exits its active region and output voltage drops below specification - critical for ultra-low-power sleep-mode designs.
How does the SC-70-5 package of TL4051B12IDCKR differ electrically from the SOT-23-3 variant?
The SC-70-5 (DCK) and SOT-23-3 (DBZ) packages of TL4051B12IDCKR share identical electrical specifications, but DCK offers dual anode terminals (Pins 2 and 5) for improved thermal symmetry and lower effective package inductance. Its θJA is 252 °C/W vs. 206 °C/W for DBZ, reflecting different thermal paths - not performance degradation.
Can TL4051B12IDCKR be used in automotive applications?
TL4051B12IDCKR is rated for –40°C to 85°C operation and is not qualified to AEC-Q200. For automotive under-hood applications requiring extended temperature range (–40°C to 125°C), the TL4051B12QDCKR variant should be selected instead - it shares the same SC-70-5 package and B-grade accuracy but is characterized across the full automotive temperature range.
TL4051B12IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
TL4051B12IDCKR FAQ
1.How can I place an order for TL4051B12IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051B12IDCKR 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 TL4051B12IDCKR reliable?
The price and inventory of TL4051B12IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051B12IDCKR is usually 5 days.
3.What payment methods are accepted for TL4051B12IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL4051B12IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL4051B12IDCKR?
TL4051B12IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051B12IDCKR 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 TL4051B12IDCKR?
For technical support, including TL4051B12IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051B12IDCKR requirements.
6.How does Aetrix verify that TL4051B12IDCKR is sourced from the original manufacturer or authorized distributors?
All TL4051B12IDCKR 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 TL4051B12IDCKR meets industry standards.
7.What is the process for return or replacement of TL4051B12IDCKR?
All TL4051B12IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TL4051B12IDCKR, 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 TL4051B12IDCKR part is unused and in its original packaging.
Return procedure for TL4051B12IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL4051B12IDCKR Tags
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