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Texas Instruments TL431ACDCKTG4
- Part No.:
- TL431ACDCKTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TL431ACDCKTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,243
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Product details
Overview
TL431ACDCKTG4 from Texas Instruments is a precision programmable shunt voltage reference in SC-70 (DCK) package, featuring 1% initial tolerance at 25°C, 2.47–2.52 V reference voltage, 0.2 Ω typical dynamic impedance, and operation from −40°C to 85°C. It replaces Zener diodes in secondary-side regulation of flyback SMPSs, adjustable power supplies, and voltage monitoring circuits.
For engineers reviewing the TL431ACDCKTG4 datasheet, TL431ACDCKTG4 pinout, TL431ACDCKTG4 application, or TL431ACDCKTG4 equivalent, key selection factors include its A-grade accuracy, SOT-23-3-compatible SC-70 footprint, low 0.4 mA minimum cathode current for regulation, and thermal stability across industrial temperature range.
Technical Context
The TL431ACDCKTG4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.5 V bandgap reference, error amplifier, and NPN output stage. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop feedback in isolated DC/DC converters.
It operates as a two-resistor-programmable reference: cathode-anode voltage is set between 2.47 V and 36 V using external R1/R2 divider connected to REF and ANODE. The device sinks 1–100 mA cathode current and maintains regulation down to 0.4 mA minimum cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.47–2.52 V at 25°C; defines precise threshold for feedback loop in regulated power supplies |
| Initial Tolerance | ±1% (A grade); ensures tight output voltage accuracy without trimming in production |
| Temp Range | −40°C to +85°C; qualified for industrial ambient environments without derating |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage variation under load transients |
| Imin | 0.4–0.6 mA; lowest cathode current sustaining regulation-critical for low-power standby modes |
| IKA Max | 100 mA continuous; supports medium-current shunt regulation without external pass devices |
| VKA Max | 36 V; enables direct use in 24 V and 32 V bus applications with margin |
Pinout & Package
TL431ACDCKTG4 uses the SC-70 (DCK) 3-pin surface-mount package (2.2 mm × 1.35 mm × 0.95 mm), pin-compatible with SOT-23-3 but with tighter dimensional control and improved thermal resistance (RθJA = 259°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current sink node | Connects to primary-side optocoupler LED or feedback resistor divider; carries full regulation current |
| 2: REF | Reference input threshold | Senses divided output voltage; triggers regulation when ≥2.47 V; high-impedance (2–4 µA input current) |
| 3: ANODE | Common return/reference ground | Typically tied to system ground or negative rail; serves as voltage reference point for REF and cathode |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Programmable from 2.47 V to 36 V via two external resistors-enables single BOM for multiple output rails |
| Low Output Noise | Enables clean feedback in sensitive analog or low-noise power systems without added filtering |
| Zener Replacement Capability | Sharp turn-on and low dynamic impedance allow direct drop-in replacement for 2.5–36 V Zeners with superior stability |
| Industrial Temp Grade | Specified from −40°C to +85°C-supports deployment in uncontrolled enclosures and outdoor electronics |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated flyback converter where output voltage feedback crosses transformer barrier via optocoupler. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to drive optocoupler LED; closes feedback loop on secondary side. Use Value: Enables ±1% output regulation without primary-side sensing; eliminates need for auxiliary winding or complex compensation. | Use Scenario: Fixed-voltage clamp or reference in linear regulators, battery monitors, or overvoltage protection circuits. IC Role / Device Role / Timing Role: Programmable shunt element replacing discrete Zener diodes with tighter tolerance and lower impedance. Use Value: Reduces part count and improves long-term stability-no drift-induced calibration drift over temperature or life. |
| Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Undervoltage lockout (UVLO) or overvoltage detection in microcontroller power domains. IC Role / Device Role / Timing Role: Precision threshold detector comparing supply rail against internally stable 2.5 V reference. Use Value: Eliminates external reference IC; achieves <±10 mV trip-point accuracy across −40°C to 85°C. | Use Scenario: Simple window comparator or level-shifting interface requiring accurate internal reference. IC Role / Device Role / Timing Role: Provides stable reference input to external op-amp or comparator while sourcing minimal bias current. Use Value: Removes need for separate reference IC and reduces PCB area-REF pin draws only 2–4 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | SOT-23-3 package; identical electrical specs but different mechanical footprint and thermal resistance (RθJA = 206°C/W vs. 259°C/W) | Higher power dissipation capability due to lower thermal resistance; preferred for >50 mA continuous cathode loads | Select TL431ACDBVR if board layout allows SOT-23-3 and thermal margin is constrained. |
| TL431AILP | TO-92 through-hole package; same A-grade accuracy and −40°C to 85°C rating but larger size and higher RθJA (140°C/W) | Used in legacy designs, prototyping, or high-reliability through-hole assemblies where reflow is not available | Choose TL431AILP only for manual assembly, repair, or compatibility with existing TO-92 footprints. |
Compared with TL431ACDCKTG4, TL431ACDBVR offers better thermal performance in space-constrained layouts, while TL431AILP provides through-hole reliability at the cost of board area and reflow compatibility-selection depends on assembly method, power density, and legacy footprint requirements.
Availability
TL431ACDCKTG4 is available at Aetrix Electronics and suitable for industrial power supplies, embedded voltage monitoring systems, and optocoupler-based feedback loops requiring stable component supply and guaranteed long-term sourcing.
Supply support for TL431ACDCKTG4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TL431 product line delivers precision programmable shunt references optimized for secondary-side regulation, voltage supervision, and Zener replacement in cost-sensitive, high-volume power management applications.
FAQ
What is the reference voltage tolerance of TL431ACDCKTG4 at 25°C?
The TL431ACDCKTG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a Vref range of 2.47 V to 2.52 V under standard test conditions (VKA = Vref, IKA = 10 mA). This A-grade accuracy is specified in Section 7.8 of the SLVS543P datasheet and applies across the SC-70 (DCK) package variant.
Can TL431ACDCKTG4 replace a standard Zener diode in a 12 V regulator circuit?
Yes, TL431ACDCKTG4 can directly replace Zener diodes in 12 V regulator circuits. With external resistors R1 and R2, it sets cathode-anode voltage to 12 V (e.g., R1 = 3.83 kΩ, R2 = 1 kΩ). Its 0.2 Ω dynamic impedance, sharp turn-on, and ±1% tolerance provide superior regulation versus typical 5% Zeners-especially under varying load or temperature.
What is the minimum cathode current required for regulation in TL431ACDCKTG4?
The TL431ACDCKTG4 requires a minimum cathode current (Imin) of 0.4–0.6 mA to maintain regulation, per Section 7.8 of the datasheet. This low threshold enables reliable operation in ultra-low-power standby modes and high-impedance feedback networks where current budget is limited.
Does TL431ACDCKTG4 support operation at −40°C?
Yes, TL431ACDCKTG4 is rated for operation from −40°C to +85°C (I-grade temperature range). Its VI(dev) voltage deviation over this range is 14–34 mV, ensuring stable reference performance in industrial and automotive under-hood environments without additional compensation.
What package type is used by TL431ACDCKTG4?
TL431ACDCKTG4 uses the SC-70 (DCK) 3-pin surface-mount package, measuring 2.2 mm × 1.35 mm × 0.95 mm. It is mechanically distinct from SOT-23-3 but shares identical pinout (CATHODE–REF–ANODE) and functional compatibility with other TL431A variants in DCK packaging.
TL431ACDCKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TL431ACDCKTG4 FAQ
1.How can I place an order for TL431ACDCKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACDCKTG4 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 TL431ACDCKTG4 reliable?
The price and inventory of TL431ACDCKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACDCKTG4 is usually 5 days.
3.What payment methods are accepted for TL431ACDCKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACDCKTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACDCKTG4?
TL431ACDCKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACDCKTG4 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 TL431ACDCKTG4?
For technical support, including TL431ACDCKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACDCKTG4 requirements.
6.How does Aetrix verify that TL431ACDCKTG4 is sourced from the original manufacturer or authorized distributors?
All TL431ACDCKTG4 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 TL431ACDCKTG4 meets industry standards.
7.What is the process for return or replacement of TL431ACDCKTG4?
All TL431ACDCKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACDCKTG4, 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 TL431ACDCKTG4 part is unused and in its original packaging.
Return procedure for TL431ACDCKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ACDCKTG4 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
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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