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Texas Instruments TLVH431IDCKT
- Part No.:
- TLVH431IDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431IDCKT.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:743
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Product details
Overview
TLVH431IDCKT from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 package, featuring 1.24 V reference voltage (±0.5% at 25°C), 100 μA to 70 mA cathode current range, 0.25 Ω typical dynamic impedance, and operation from –40°C to +125°C. It serves as an ultra-low-voltage Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431IDCKT datasheet, TLVH431IDCKT pinout, TLVH431IDCKT application, or TLVH431IDCKT equivalent, key selection criteria include reference tolerance grade (B-grade = 0.5%), SC-70 footprint constraints, cathode current headroom for regulation, and compatibility with optocoupler-based secondary-side control in 3.3 V systems.
Technical Context
The TLVH431IDCKT implements a three-terminal shunt topology with internal 1.24 V bandgap reference and high-gain NPN Darlington output stage. Its open-loop mode functions as a comparator with integrated reference; closed-loop operation enables precise voltage regulation via resistive divider feedback between cathode and reference pins.
Unlike TL431, it operates down to 1.24 V cathode-anode voltage with only 100 μA minimum cathode current for regulation. The SC-70-6 package includes two NC pins and substrate-connected pin 2, requiring connection to anode or floating per TI's pin function specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets minimum adjustable output voltage and defines accuracy of regulated rail |
| Cathode Current Range | 100 μA to 70 mA - determines minimum bias requirement and maximum shunt power handling capability |
| Dynamic Impedance | 0.25 Ω typical - ensures tight regulation under load transients without external capacitor |
| Operating Temperature | –40°C to +125°C - supports automotive under-hood and industrial ambient conditions |
| Output Voltage Range | VREF to 18 V - achieved with two external resistors, enabling flexible rail monitoring or regulation |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in high-impedance feedback networks |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage variation across 1.24–18 V |
Pinout & Package
TLVH431IDCKT uses the SC-70-6 (DCK) package (2.00 mm × 1.25 mm), offering 40% smaller footprint than SOT-23-3. Pin 2 is substrate-connected and must be tied to ANODE or left open; pins 4 and 5 are no-connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Sinks current to regulate voltage; connects to feedback point in isolated SMPS or voltage monitor node |
| ANODE (Pin 2) | Common reference terminal | Typically grounded; substrate connection requires tie to ANODE or float - not left unconnected |
| REF (Pin 3) | Threshold sensing input | Compares external voltage to internal 1.24 V reference; draws ≤0.5 μA, enabling high-R dividers |
| NC (Pin 4) | No internal connection | Unused; must remain unconnected on PCB |
| NC (Pin 5) | No internal connection | Unused; must remain unconnected on PCB |
| NC (Pin 6) | No internal connection | Unused; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode voltage - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot start |
| B-grade precision | ±0.5% reference tolerance at 25°C - reduces calibration overhead in precision ADC references and voltage monitors |
| Ultra-low minimum cathode current | 100 μA max - allows regulation in low-power standby modes and battery-backed circuits |
| Internal compensation | Stable without output capacitor - simplifies layout and eliminates ESR-related instability in compact designs |
| Wide temperature range | Specified from –40°C to +125°C - supports automotive Q-grade applications without derating |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary Side Regulation in Flyback SMPSs |
|---|---|
Use Scenario: Provides stable reference for 12–16-bit SAR and delta-sigma ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference sourcing <0.5 μA into ADC REF pin, rejecting supply ripple. Use Value: Enables ±0.5 LSB accuracy over temperature without trimming, leveraging 0.25 Ω impedance and <12 mV VREF drift. |
Use Scenario: Error amplifier and voltage reference in optocoupler-coupled feedback loop of 3.3 V isolated flyback converter. IC Role / Device Role / Timing Role: Compares scaled output voltage to 1.24 V reference and drives optocoupler LED to adjust primary-side controller duty cycle. Use Value: Achieves <±1% output regulation at 3.3 V with 100 μA minimum cathode current, enabling startup below 2.7 V. |
| Zener Replacement with Low Leakage | Voltage Monitoring for Power Rails |
Use Scenario: Replaces 2.4 V Zener diode in 3.3 V LDO pre-regulator circuit for microcontroller I/O domain. IC Role / Device Role / Timing Role: Shunt regulator clamping excess voltage while drawing only 0.1 μA leakage when off-state. Use Value: Reduces quiescent current by >95% vs. Zener, extending battery life in always-on sensor nodes. |
Use Scenario: Monitors 5 V, 12 V, or 24 V system rails for undervoltage lockout in industrial PLC modules. IC Role / Device Role / Timing Role: Comparator with integrated 1.24 V reference, triggering reset when divided rail drops below threshold. Use Value: Eliminates external reference IC; achieves 1% trip-point accuracy using 1% resistors and B-grade VREF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | SOT-23-5 package; includes dedicated NC and substrate pins - different pinout and larger footprint than SC-70 | Requires PCB redesign; suitable for space-tolerant designs needing same electrical specs in standard SOT-23 | Select when SC-70 assembly is unavailable or thermal resistance >206°C/W is acceptable |
| TLVH432IDCKR | Identical SC-70-6 package but alternate pinout: REF/ANODE/CATHODE on pins 1/2/3 - incompatible with TLVH431IDCKT layout | Not drop-in; requires schematic and layout revision due to reversed REF/ANODE assignment | Choose only if redesigning for TLVH432's alternate feedback configuration in new designs |
Compared with TLVH431IDCKT, TLVH431ACDBVR offers identical regulation performance but demands SOT-23-5 layout and higher thermal resistance (206°C/W vs. 259°C/W), while TLVH432IDCKR shares the SC-70 footprint but mandates pin reassignment - neither is pin-compatible without hardware changes.
Availability
TLVH431IDCKT is available at Aetrix Electronics and suitable for isolated power supplies, precision analog references, and industrial voltage monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for TLVH431IDCKT 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 communications markets.
The TLVH431 family was designed as a low-voltage, high-precision upgrade to TL431 for next-generation power management in space-constrained, low-voltage systems - emphasizing minimal cathode current, tight reference tolerance, and robust thermal performance.
FAQ
What is the reference voltage tolerance of TLVH431IDCKT at 25°C?
The TLVH431IDCKT is a B-grade device with ±0.5% reference voltage tolerance at 25°C, meaning its VREF falls between 1.234 V and 1.246 V under nominal conditions. This tolerance is confirmed in Section 5.7 of the TI SLVS555N datasheet and applies specifically to the TLVH431IDCKT variant, not the broader TLVH431 family.
Can TLVH431IDCKT operate with cathode voltage below 1.24 V?
No - TLVH431IDCKT requires a minimum cathode-to-anode voltage of 1.24 V to maintain regulation. Below this threshold, the internal amplifier cannot bias correctly, and the device exits regulation. This is specified in the "Recommended Operating Conditions" table (Section 5.3) and verified in Figure 5-3's cathode current vs. voltage curve.
What is the purpose of Pin 2 in the TLVH431IDCKT SC-70 package?
Pin 2 of TLVH431IDCKT is the substrate connection and must be tied to the ANODE terminal or left electrically floating - it must never be left unconnected or grounded independently. This requirement is explicitly stated in the "Pin Functions" table and Figure 4-2 of the TI datasheet to prevent latch-up or parametric shift.
How does TLVH431IDCKT differ from TLVH432IDCKR?
TLVH431IDCKT and TLVH432IDCKR share the SC-70-6 package but have inverted pinouts: TLVH431IDCKT assigns CATHODE/ANODE/REF to pins 1/2/3, while TLVH432IDCKR assigns REF/ANODE/CATHODE to those same pins. They are electrically identical but not pin-compatible - using TLVH432IDCKR in a TLVH431IDCKT layout causes functional failure.
Is an output capacitor required for stability with TLVH431IDCKT?
No - TLVH431IDCKT is internally compensated and stable without an output capacitor between cathode and anode. However, if added, capacitive load stability depends on value and cathode voltage; Figures 5-15 through 5-17 in the TI datasheet provide phase-margin guidance for 1.25 V, 2.5 V, and 5 V operating points.
TLVH431IDCKT 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
TLVH431IDCKT FAQ
1.How can I place an order for TLVH431IDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431IDCKT 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 TLVH431IDCKT reliable?
The price and inventory of TLVH431IDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431IDCKT is usually 5 days.
3.What payment methods are accepted for TLVH431IDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431IDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431IDCKT?
TLVH431IDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431IDCKT 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 TLVH431IDCKT?
For technical support, including TLVH431IDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431IDCKT requirements.
6.How does Aetrix verify that TLVH431IDCKT is sourced from the original manufacturer or authorized distributors?
All TLVH431IDCKT 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 TLVH431IDCKT meets industry standards.
7.What is the process for return or replacement of TLVH431IDCKT?
All TLVH431IDCKT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431IDCKT, 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 TLVH431IDCKT part is unused and in its original packaging.
Return procedure for TLVH431IDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431IDCKT Tags
-
TL431AIDBZR
Texas Instruments
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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
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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