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Texas Instruments TLVH431IDCKR
- Part No.:
- TLVH431IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431IDCKR.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:8,687
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Product details
Overview
TLVH431IDCKR from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 package, providing 1.24 V reference voltage with ±0.5% initial tolerance (B-grade), 100 μA to 70 mA cathode current range, and 0.25 Ω typical dynamic impedance. It serves as an ultra-low-voltage Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431IDCKR datasheet, TLVH431IDCKR pinout, TLVH431IDCKR application, or TLVH431IDCKR equivalent, key selection criteria include minimum operating voltage (1.24 V), thermal stability across –40°C to +125°C, SC-70 footprint constraints, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH431IDCKR implements a bandgap-referenced error amplifier with internal 1.24 V reference and Darlington output stage, enabling precise shunt regulation down to 1.24 V - 1.26 V lower than TL431. Its open-loop gain supports comparator operation, while closed-loop configuration with external resistors sets output voltage from VREF to 18 V.
It operates without mandatory output capacitance due to internal compensation, but phase margin versus capacitive load (up to 10 nF) is characterized for stability assurance. The SC-70 package (2.00 mm × 1.25 mm) delivers 40% smaller footprint than SOT-23-3 while maintaining full electrical performance across industrial and automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - enables accurate low-voltage regulation starting at 1.24 V, critical for 3.3 V and lower isolated SMPS designs |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring and high-current shunt regulation without external biasing |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions in feedback loops |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control applications requiring extended thermal robustness |
| Package | SC-70 (DCK) - 2.00 mm × 1.25 mm footprint with 6-pin layout, optimized for space-constrained PCBs |
| Output Voltage Range | VREF to 18 V - set via two external resistors, supporting wide-range adjustable references without discrete Zeners |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and enables high-impedance sensing in battery-powered systems |
Pinout & Package
TLVH431IDCKR uses the 6-pin SC-70 (DCK) package with substrate-connected Pin 2. Pin 1 is CATHODE (shunt current sink), Pin 3 is REF (reference input), Pin 6 is ANODE (common return), and Pins 4/5 are NC (no internal connection). Pin 2 must be connected to ANODE or left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current input | Sinks regulated current into external circuit; connects to optocoupler LED anode or feedback node in SMPS |
| 2 (SUBSTRATE) | Internal die substrate | Must be tied to ANODE or left unconnected; not electrically active but affects thermal and ESD behavior |
| 3 (REF) | Reference input | Compares external voltage divider to internal 1.24 V; requires ≥0.1 μA bias current for proper NPN base drive |
| 4,5 (NC) | No internal connection | Unused pins; no bonding wire or silicon connection; may be left unconnected or grounded for mechanical stability |
| 6 (ANODE) | Common return path | Typically connected to system ground or power rail common; forms reference point for cathode and REF terminals |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Ultra-small SC-70 footprint | 2.00 mm × 1.25 mm - reduces PCB area by 40% vs SOT-23-3, critical for compact power modules and wearables |
| Stable without output capacitor | Internally compensated - eliminates need for external capacitor in most configurations, simplifying layout and BOM |
| Sharp turn-on characteristic | High open-loop gain with Darlington output - provides fast, clean switching in comparator mode for voltage monitoring |
| Low leakage off-state current | 0.02–0.1 μA at 18 V - minimizes standby power loss in always-on monitoring circuits and battery backup rails |
Applications
| Isolated Flyback SMPS Feedback | Zener Diode Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier - compares divided output voltage to 1.24 V reference and sinks current to modulate optocoupler LED brightness. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto VF) with ±0.5% accuracy, improving cross-regulation and load transient response over discrete Zener solutions. |
Use Scenario: Precision voltage clamping on microcontroller I/O lines or analog sensor inputs. IC Role / Device Role / Timing Role: Low-leakage shunt reference - clamps voltage at precisely 1.24 V × (1 + R1/R2) with sub-μA input current. Use Value: Reduces leakage current by >99% vs 1N4728A (5 μA typical), preserving battery life in always-on monitoring nodes and extending signal chain accuracy. |
| ADC Reference Buffering | Power Rail Monitoring |
|
Use Scenario: Providing stable, adjustable reference voltage for SAR or delta-sigma ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source - supplies reference to ADC REF+ pin via buffered divider network. Use Value: Delivers <12 mV VREF deviation over –40°C to +125°C and <0.5 μA reference current, minimizing code-width error and offset drift. |
Use Scenario: Undervoltage lockout (UVLO) and brown-out detection on 5 V or 12 V power rails in industrial PLCs. IC Role / Device Role / Timing Role: Comparator with integrated reference - triggers reset when rail drops below threshold set by resistor divider. Use Value: Eliminates external reference IC and comparator, reducing component count while maintaining ±1% trip accuracy over full temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | Same SC-70 package, A-grade (±1%) tolerance, identical pinout and electrical specs except reference accuracy | Accepts wider VREF variation; suitable where ±1% regulation suffices and cost sensitivity is higher | Select TLVH431ACDBVR when ±1% initial tolerance meets system accuracy requirements and budget constraints apply |
| TLV431ACDBVR | Lower max cathode voltage (6 V vs 18 V), same SC-70 package, ±1% tolerance, 1.24 V reference | Limited to ≤6 V output applications; unsuitable for high-voltage SMPS or wide-range adjustable references | Choose TLV431ACDBVR only for low-voltage (<6 V), cost-optimized designs where 18 V headroom is unnecessary |
Compared with TLVH431IDCKR, TLVH431ACDBVR trades ±0.5% accuracy for lower unit cost while retaining full 18 V capability, whereas TLV431ACDBVR sacrifices voltage range for reduced complexity and price in sub-6 V systems - making TLVH431IDCKR optimal for high-accuracy, wide-range, automotive-grade shunt regulation.
Availability
TLVH431IDCKR is available at Aetrix Electronics and suitable for isolated power supplies, precision voltage monitoring, and low-power analog reference circuits requiring stable component supply and long-term lifecycle support.
Supply support for TLVH431IDCKR 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 power management technologies, with decades of expertise in precision reference design.
The TLVH431 family was engineered for low-voltage, high-accuracy shunt regulation in space- and power-constrained applications - particularly targeting secondary-side feedback in isolated DC/DC converters and precision analog subsystems.
FAQ
What is the reference voltage tolerance of TLVH431IDCKR at 25°C?
The TLVH431IDCKR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.234 V to 1.246 V. This B-grade accuracy is confirmed in Section 5.7 of the TI datasheet and applies specifically to the TLVH431IDCKR variant. The tighter tolerance directly improves regulation accuracy in feedback loops and reference buffering applications.
Can TLVH431IDCKR operate with cathode voltage below 1.24 V?
No, TLVH431IDCKR requires a minimum cathode-to-anode voltage of 1.24 V to enter regulation - it cannot regulate or maintain reference accuracy below this threshold. Below 1.24 V, the device remains in cutoff with only leakage current flowing. This hard lower limit is inherent to its bandgap reference architecture and is explicitly specified in the "Low-voltage operation" feature list and Recommended Operating Conditions table.
What is the purpose of Pin 2 on TLVH431IDCKR's SC-70 package?
Pin 2 on TLVH431IDCKR is the substrate connection, not an active signal pin. Per TI's Pin Functions table, it must be connected to the ANODE terminal or left unconnected - it is not internally wired to any circuitry. This substrate tie improves thermal conduction and ESD robustness but carries no functional current or voltage in normal operation.
How does TLVH431IDCKR achieve stability without an output capacitor?
TLVH431IDCKR incorporates internal frequency compensation that ensures loop stability across its full operating range without requiring an external cathode-to-anode capacitor. This is verified in the "Device Functional Modes" section and supported by phase margin characterization up to 10 nF capacitive load in Figures 5-15 to 5-17. External capacitors remain optional for noise filtering or specific transient response tuning.
Is TLVH431IDCKR pin-compatible with TLVH432 variants?
No, TLVH431IDCKR is not pin-compatible with TLVH432 variants. While both share the SC-70 package option, TLVH431IDCKR uses a 6-pin DCK layout (CATHODE–SUBSTRATE–REF–NC–NC–ANODE), whereas TLVH432 variants in SC-70 follow a different pinout - confirmed in Figure 4-2 (TLVH431) vs Figure 4-5 (TLVH432 SOT-23) and the Pin Functions table. Substitution requires PCB redesign.
TLVH431IDCKR 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):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1.5%
- 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
TLVH431IDCKR FAQ
1.How can I place an order for TLVH431IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431IDCKR 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 TLVH431IDCKR reliable?
The price and inventory of TLVH431IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431IDCKR is usually 5 days.
3.What payment methods are accepted for TLVH431IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431IDCKR?
TLVH431IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431IDCKR 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 TLVH431IDCKR?
For technical support, including TLVH431IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431IDCKR requirements.
6.How does Aetrix verify that TLVH431IDCKR is sourced from the original manufacturer or authorized distributors?
All TLVH431IDCKR 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 TLVH431IDCKR meets industry standards.
7.What is the process for return or replacement of TLVH431IDCKR?
All TLVH431IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431IDCKR, 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 TLVH431IDCKR part is unused and in its original packaging.
Return procedure for TLVH431IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431IDCKR Tags
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