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Texas Instruments TLV431BIDCKR
- Part No.:
- TLV431BIDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLV431BIDCKR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TLV431BIDCKR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% initial reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-anode voltage. It delivers 0.25 Ω typical dynamic impedance, 80 µA typical minimum cathode current for regulation, and supports output voltage adjustment from 1.24 V to 6 V using two external resistors. It is used in isolated flyback secondary-side regulation, voltage monitoring, and as a Zener diode replacement in space-constrained power supplies.
For engineers reviewing the TLV431BIDCKR datasheet, TLV431BIDCKR pinout, TLV431BIDCKR application, or TLV431BIDCKR equivalent, key selection considerations include its SC-70-6 package footprint (2.0 mm × 1.5 mm), tight 0.5% VREF tolerance, low 80 µA IK(min) requirement, thermal stability across –40°C to 125°C (TLV431BQ grade), and compatibility with optocoupler-based feedback in 3.3 V/3 V SMPS designs.
Technical Context
The TLV431BIDCKR implements a bandgap-referenced error amplifier with Darlington sink output, enabling precise closed-loop shunt regulation or open-loop comparator operation. Its internal architecture requires ≥1.24 V cathode-to-anode headroom and ≥55 µA cathode current to enter linear regulation mode, with reference terminal current ≤0.5 µA ensuring minimal loading on feedback dividers.
Unlike the TL431, it operates at lower voltage (1.24 V vs. 2.5 V reference) and lower minimum cathode current (80 µA vs. 1 mA), making it suitable for low-power, low-voltage systems. Stability is internally compensated-no output capacitor required-but phase margin degrades with capacitive loads >1 nF, per Figure 5-19–5-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - enables accurate voltage setting with minimal resistor tolerance impact in feedback networks |
| VKA Range | 1.24 V to 6 V - supports regulation of 3.3 V, 5 V, and other common rail voltages using two external resistors |
| IK(min) | 55 µA to 100 µA - allows stable regulation even in ultra-low-power standby modes or high-impedance feedback paths |
| |zKA| | 0.25 Ω typical - ensures minimal output voltage deviation under load transients, critical for tight-tolerance references |
| Temp Drift (–40°C to 125°C) | 11 mV max - corresponds to ~92 ppm/°C, supporting industrial and automotive temperature-critical applications |
| IREF | 0.1 µA to 0.5 µA - reduces divider current error and power loss, enabling high-resistance (e.g., 1 MΩ) feedback networks |
| Package | SC-70-6 (DCK) - 2.0 mm × 1.5 mm footprint, 40% smaller than SOT-23-3, ideal for compact DC/DC modules and portable electronics |
Pinout & Package
TLV431BIDCKR is housed in a 6-pin SC-70 (DCK) package with exposed pad thermal enhancement. Pin 1 is CATHODE, Pin 3 is REFERENCE, Pin 6 is ANODE; Pins 2, 4, and 5 are no-connect (NC) terminals. The substrate connection (Pin 2) must be tied to ANODE or left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current input / output node | Sinks regulated current; connects to supply rail or optocoupler LED anode in isolated feedback loops |
| 2 (NC / Substrate) | No internal connection (substrate tie) | Must be connected to ANODE or left open; not electrically active but affects thermal path and ESD robustness |
| 3 (REFERENCE) | Feedback input / threshold sense node | Compares external voltage to 1.24 V internal reference; requires ≥0.1 µA bias current for proper NPN base drive |
| 4 (NC) | No internal connection | Unused; must remain unconnected to avoid parasitic coupling or latch-up risk |
| 5 (NC) | No internal connection | Unused; PCB layout should avoid routing signals near this pin to minimize noise injection |
| 6 (ANODE) | Common return / ground reference | Typically tied to system ground; serves as voltage reference point for both VKA and VREF measurements |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% VREF tolerance at 25°C | Reduces need for post-production trimming in precision voltage monitors and programmable power supplies |
| Ultra-small SC-70-6 package | Enables placement in dense power IC layouts where SOT-23-3 or SOIC-8 footprints are prohibitive |
| Low 80 µA typical IK(min) | Permits use with high-value feedback resistors (>1 MΩ), minimizing quiescent current in battery-powered systems |
| 0.25 Ω dynamic impedance | Maintains <1 mV output shift under 1 mA load steps-critical for ADC reference buffers and sensor excitation circuits |
| Internal compensation | Eliminates need for external compensation capacitor in most shunt regulator configurations, simplifying BOM and layout |
Applications
| Isolated Flyback Secondary Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Used with optocoupler in 3.3 V/5 V isolated flyback converters to regulate output voltage on secondary side. IC Role / Device Role / Timing Role: Acts as adjustable shunt regulator and error amplifier-senses output via resistor divider, drives optocoupler LED to adjust primary-side PWM duty cycle. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto LED VF), with tighter tolerance and lower minimum current than standard Zeners. |
Use Scenario: Replaces discrete 2.5 V or 3.3 V Zener diodes in on-board voltage clamping and rail sensing. IC Role / Device Role / Timing Role: Functions as a precision, low-current shunt reference-provides sharp turn-on and stable knee voltage without leakage or temp drift penalties. Use Value: Delivers 0.5% accuracy and 11 mV drift over –40°C to 125°C, outperforming 5% Zeners and reducing calibration overhead. |
| Voltage Monitoring & Threshold Detection | Comparator with Integrated Reference |
|
Use Scenario: Monitors microcontroller supply rails (e.g., 1.8 V, 3.3 V) for brown-out detection or power-good signaling. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode-REF pin tied to monitored rail, CATHODE pulled up to enable fast trip response. Use Value: Eliminates need for external reference IC; achieves <10 µs response with built-in 1.24 V threshold and 0.1 µA input bias. |
Use Scenario: Serves as single-supply comparator in battery voltage gauging or overvoltage protection circuits. IC Role / Device Role / Timing Role: Uses internal 1.24 V reference and Darlington output stage to compare analog input against fixed threshold. Use Value: Reduces component count versus op-amp + external reference; supports rail-to-rail input with 55 µA minimum cathode current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDBVR | SOT-23-5 package (2.90 mm × 2.80 mm); includes NC pin and substrate tie on Pin 2; same electrical specs | Larger footprint; better thermal dissipation (RθJA = 206°C/W vs. 87°C/W for DCK); suited for higher-current or thermally stressed layouts | Select when board space permits larger package and thermal performance outweighs size constraints. |
| TLVH431ILP | Wider VKA range (1.24 V to 18 V); TO-92-3 package; 1% VREF tolerance; higher IK(max) (80 mA) | Supports higher-voltage rails (e.g., 12 V, 15 V) and higher current sinking; less precise reference; through-hole mounting only | Choose for legacy through-hole designs or applications requiring >6 V regulation or >15 mA sink capability. |
Compared with TLV431BIDCKR, TLV431BIDBVR offers identical regulation performance in a larger, thermally robust SOT-23-5 package, while TLVH431ILP trades precision and size for extended voltage range and through-hole compatibility-neither is pin-compatible, but both serve overlapping functional roles in shunt-based feedback and referencing.
Availability
TLV431BIDCKR is available at Aetrix Electronics and suitable for isolated SMPS design, precision voltage monitoring, and low-power Zener replacement applications requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for TLV431BIDCKR 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, power management, and signal chain solutions.
The TLV431BIDCKR belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, low-power, and space-constrained applications including isolated DC/DC converters, battery management, and industrial sensor interfaces.
FAQ
What is the reference voltage tolerance of TLV431BIDCKR at 25°C?
The TLV431BIDCKR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a VREF range of 1.234 V to 1.246 V. This tight tolerance is specified in Section 5.7 of the TI datasheet SLVS139Z and applies exclusively to the TLV431B grade. It enables high-accuracy voltage setting without post-assembly calibration in applications such as precision power supplies and sensor reference circuits.
Can TLV431BIDCKR operate with a cathode-to-anode voltage below 1.24 V?
No, TLV431BIDCKR requires a minimum cathode-to-anode voltage (VKA) of 1.24 V to function in regulation mode. Below this threshold, the internal amplifier cannot bias correctly, and the device exits linear operation. The datasheet specifies VKA ≥ VREF (1.24 V) in Recommended Operating Conditions (Section 5.3), and Figure 5-4 confirms sharp turn-on only above this voltage. Attempting sub-1.24 V operation results in unregulated, high-impedance behavior.
What is the minimum cathode current required for regulation in TLV431BIDCKR?
The TLV431BIDCKR requires a minimum cathode current (IK(min)) of 55 µA to maintain regulation, with a maximum of 100 µA across temperature (–40°C to 125°C). This value is confirmed in Section 5.7 Electrical Characteristics for TLV431B. Designers must ensure the external circuit supplies at least 55 µA into the CATHODE pin under all operating conditions-including light-load and high-temperature scenarios-to guarantee stable reference voltage and feedback loop integrity.
How does the SC-70-6 (DCK) package of TLV431BIDCKR compare thermally to SOT-23-3 variants?
The SC-70-6 (DCK) package of TLV431BIDCKR has a junction-to-ambient thermal resistance (RθJA) of 87°C/W, significantly lower than the 206°C/W of the SOT-23-3 (DBZ) variant per Table 5.4. This 58% improvement stems from the DCK package's optimized thermal pad and shorter internal conduction paths. As a result, TLV431BIDCKR can dissipate more power or operate at lower junction temperatures in compact layouts-critical for high-density power modules where thermal headroom is constrained.
Is TLV431BIDCKR pin-compatible with TL431 or TLVH431 devices?
No, TLV431BIDCKR is not pin-compatible with TL431 or TLVH431 devices. TLV431BIDCKR uses a 6-pin SC-70 (DCK) configuration with three NC pins and a dedicated substrate tie, whereas TL431 is typically offered in TO-92 or SOIC-8 packages with 3 active pins, and TLVH431 variants use SOT-89 or TO-92 footprints. Pin mapping, package dimensions, and terminal functions differ fundamentally-direct replacement requires PCB redesign and layout validation.
TLV431BIDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 6 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TLV431BIDCKR FAQ
1.How can I place an order for TLV431BIDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BIDCKR 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 TLV431BIDCKR reliable?
The price and inventory of TLV431BIDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BIDCKR is usually 5 days.
3.What payment methods are accepted for TLV431BIDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431BIDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431BIDCKR?
TLV431BIDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BIDCKR 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 TLV431BIDCKR?
For technical support, including TLV431BIDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BIDCKR requirements.
6.How does Aetrix verify that TLV431BIDCKR is sourced from the original manufacturer or authorized distributors?
All TLV431BIDCKR 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 TLV431BIDCKR meets industry standards.
7.What is the process for return or replacement of TLV431BIDCKR?
All TLV431BIDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BIDCKR, 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 TLV431BIDCKR part is unused and in its original packaging.
Return procedure for TLV431BIDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431BIDCKR Tags
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