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Texas Instruments TL4051CIDCKT
- Part No.:
- TL4051CIDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TL4051CIDCKT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,321
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Product details
Overview
TL4051CIDCKT 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 85°C and is used in battery-powered instrumentation and portable power-supply monitors where low quiescent current and high DC stability are critical.
For engineers reviewing the TL4051CIDCKT datasheet, TL4051CIDCKT pinout, TL4051CIDCKT application, or TL4051CIDCKT equivalent, key selection criteria include initial voltage tolerance, thermal drift performance over industrial temperature range, minimum cathode current requirement for regulation, noise spectral density in 10Hz–10kHz band, and compatibility with capacitive loads without external compensation.
Technical Context
The TL4051CIDCKT implements a two-terminal shunt topology with internal bandgap reference core and buffered feedback amplifier, enabling precise voltage regulation via external series resistor. Its dynamic impedance remains ≤0.5Ω at 1mA (f = 120Hz), supporting fast load transients in precision ADC biasing and DAC reference circuits.
Unlike series references, it requires no input capacitor and remains stable with any capacitive load - including ceramic bypass caps up to 10μF - due to inherent pole-zero cancellation in its transconductance stage. The SC-70-5 package supports high-density PCB layouts while maintaining thermal resistance of 252°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.225V at IZ = 100μA; enables direct replacement of legacy 1.2V references with tighter DC accuracy. |
| Initial Accuracy | ±0.5% max (C grade) at 25°C; ensures <±6.13mV absolute error in factory-calibrated sensor front-ends. |
| Temp Coefficient | ±50ppm/°C max over –40°C to 85°C; contributes ≤±2.05mV drift across full industrial range. |
| Noise (10Hz–10kHz) | 20μVRMS typical; supports 16-bit+ resolution in low-frequency data acquisition without added filtering. |
| Cathode Current Range | 60μA (typ) to 12mA; allows ultra-low-power sleep-mode operation while sustaining regulation during wake-up bursts. |
| Dynamic Impedance | 0.5Ω at 1mA/120Hz; minimizes output voltage perturbation under dynamic load steps in closed-loop power monitoring. |
| Long-Term Stability | 120ppm after 1000h; guarantees <±0.15mV output shift over 1-year deployment in energy metering hardware. |
Pinout & Package
TL4051CIDCKT is housed in a 5-pin SC-70 (DCK) package with exposed pad for thermal enhancement. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is NC (must be left open or tied to Anode per EMI guidance), Pin 4 is Feedback (FB), and Pin 5 is VREF (used only in adjustable variants; internally connected to reference node in fixed 1.225V version).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink terminal | Accepts regulated cathode current (60μA–12mA); voltage at this node defines output; connects to series resistor from supply rail. |
| Anode (Pin 2) | Reference ground node | Serves as return path for cathode current and reference bias; must be connected to system ground or low-impedance analog ground plane. |
| NC (Pin 3) | No-connect (EMI mitigation) | Internally unconnected; TI recommends leaving floating or tying to Anode in high-EMI environments near transformers or switching regulators. |
| FB (Pin 4) | Feedback input | Connected internally to reference amplifier; unused in fixed-output TL4051CIDCKT but retained for family pin compatibility. |
| VREF (Pin 5) | Internal reference tap | Provides access to 1.225V bandgap node; not externally accessible in fixed version - tied internally to Cathode via regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with all capacitive loads | Eliminates need for output capacitor - reduces BOM count and PCB area in space-constrained portable designs. |
| 20μVRMS broadband noise | Enables high-SNR signal chains in precision weigh scales and medical sensor interfaces without post-regulation filtering. |
| 60μA minimum cathode current | Supports >10-year battery life in wireless sensor nodes operating at 1μA average current with periodic 10ms wake-ups. |
| SC-70-5 thermal resistance | 252°C/W junction-to-ambient enables 12mA operation at TA = 85°C without derating in sealed enclosures. |
| ±50ppm/°C tempco | Meets Class 0.5 accuracy requirements for ANSI C12.20 revenue-grade electricity meters over full temperature range. |
Applications
| Portable Instrumentation | Industrial Power Monitoring |
|---|---|
Use Scenario: Handheld multimeter with auto-ranging ADC and Li-ion battery supply. IC Role / Device Role / Timing Role: Shunt reference providing stable 1.225V reference for 24-bit sigma-delta ADC conversion. Use Value: ±0.5% initial tolerance and 50ppm/°C drift ensure <±0.02% reading error across –10°C to 50°C handheld operating range. |
Use Scenario: DIN-rail mounted AC/DC power supply with isolated output voltage sensing. IC Role / Device Role / Timing Role: Precision shunt reference for optocoupler-based feedback loop in secondary-side regulation. Use Value: 20μVRMS noise prevents false triggering of overvoltage protection during transient line surges. |
| Battery Management Systems | Process Control Transmitters |
Use Scenario: 4-cell Li-ion pack monitor IC with integrated fuel gauge and cell balancing. IC Role / Device Role / Timing Role: Reference source for coulomb counter ADC and cell voltage measurement circuitry. Use Value: 60μA min cathode current enables continuous monitoring at <1μA system quiescent current, extending standby time. |
Use Scenario: 4–20mA HART-enabled pressure transmitter with analog front-end conditioning. IC Role / Device Role / Timing Role: Stable excitation reference for bridge sensor interface and DAC output calibration. Use Value: Long-term stability of 120ppm ensures <±0.015% full-scale error drift over 5-year field deployment without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040CIM3-1.2 | Fixed 1.225V output, ±0.5% tolerance, SOT-23-3, 75ppm/°C max tempco, 35μVRMS noise | Higher noise and tempco; suitable only where 16-bit resolution is not required | Choose when cost sensitivity outweighs noise and thermal stability needs in non-critical consumer applications |
| MAX6008BESA+ | Fixed 1.25V output, ±0.2% tolerance, SO-8, 25ppm/°C max tempco, 15μVRMS noise, 100μA min current | Higher accuracy and lower noise but larger footprint and higher quiescent current | Prefer for metrology-grade systems requiring <±0.25mV total error budget, accepting SO-8 layout impact |
Compared with TL4051CIDCKT, LM4040CIM3-1.2 trades 15μVRMS higher noise and +25ppm/°C worse drift for lower unit cost, while MAX6008BESA+ delivers superior stability and noise at the expense of 4× higher minimum current and 2.5× larger PCB area - making TL4051CIDCKT optimal for compact, battery-operated industrial sensors.
Availability
TL4051CIDCKT is available at Aetrix Electronics and suitable for portable instrumentation, industrial power monitoring, and battery management systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TL4051CIDCKT 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 industrial-grade components.
The TL4051 series was designed specifically for high-accuracy, low-power shunt reference applications in portable, automotive, and industrial systems where minimal board space and robust thermal performance are essential.
FAQ
What is the minimum cathode current required for regulation in TL4051CIDCKT?
The TL4051CIDCKT requires a minimum cathode current of 60μA (typical) to maintain regulation at 1.225V output. At 25°C, the datasheet specifies 39μA minimum, but design margin dictates using 60μA as the practical lower bound to ensure stable operation across –40°C to 85°C ambient conditions. This value directly impacts series resistor sizing in shunt regulator configurations.
Does TL4051CIDCKT require an output capacitor for stability?
No, TL4051CIDCKT does not require an output capacitor for stability. Its internal architecture is inherently stable with all capacitive loads - including 0.1μF to 10μF ceramic or tantalum capacitors - eliminating the need for external compensation. This simplifies layout and improves reliability in high-vibration environments where capacitor solder joints may fatigue.
What is the thermal resistance (θJA) of TL4051CIDCKT in its SC-70 package?
The TL4051CIDCKT in SC-70 (DCK) package has a junction-to-ambient thermal resistance (θJA) of 252°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias under the exposed pad, enabling full 12mA cathode current operation at 85°C ambient.
How does the TL4051CIDCKT differ from adjustable TL4051 variants in pin functionality?
TL4051CIDCKT uses the same SC-70-5 pinout as adjustable versions but internally connects Pin 4 (FB) and Pin 5 (VREF) to establish the fixed 1.225V output. In adjustable variants, these pins form the feedback divider interface; in TL4051CIDCKT, they are reserved for future compatibility and must not be externally loaded. Pin 3 remains NC per datasheet guidance.
What is the long-term stability specification for TL4051CIDCKT after 1000 hours?
The TL4051CIDCKT exhibits 120ppm long-term stability after 1000 hours of operation at 25°C ±0.1°C with 100μA cathode current. This equates to a maximum output voltage shift of ±0.00147V (±1.47mV) from nominal 1.225V, ensuring predictable performance in field-deployed equipment such as smart utility meters and process transmitters without recalibration.
TL4051CIDCKT 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:
- 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:
- 70 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
TL4051CIDCKT FAQ
1.How can I place an order for TL4051CIDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL4051CIDCKT 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 TL4051CIDCKT reliable?
The price and inventory of TL4051CIDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL4051CIDCKT is usually 5 days.
3.What payment methods are accepted for TL4051CIDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL4051CIDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL4051CIDCKT?
TL4051CIDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL4051CIDCKT 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 TL4051CIDCKT?
For technical support, including TL4051CIDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL4051CIDCKT requirements.
6.How does Aetrix verify that TL4051CIDCKT is sourced from the original manufacturer or authorized distributors?
All TL4051CIDCKT 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 TL4051CIDCKT meets industry standards.
7.What is the process for return or replacement of TL4051CIDCKT?
All TL4051CIDCKT units undergo pre-shipment inspection (PSI). If there is an issue with TL4051CIDCKT, 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 TL4051CIDCKT part is unused and in its original packaging.
Return procedure for TL4051CIDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL4051CIDCKT Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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