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Texas Instruments TLVH431CDCKT
- Part No.:
- TLVH431CDCKT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431CDCKT.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:155
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Product details
Overview
TLVH431CDCKT from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 package, featuring 1.24 V reference voltage (±1.5% 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 a programmable voltage reference or error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431CDCKT datasheet, TLVH431CDCKT pinout, TLVH431CDCKT application, or TLVH431CDCKT equivalent, key selection criteria include reference tolerance grade (C = standard 1.5%), ultra-small SC-70 footprint compatibility, cathode current headroom for optocoupler drive, and thermal stability across industrial temperature ranges.
Technical Context
The TLVH431CDCKT implements a three-terminal shunt topology with an internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop comparator mode enables voltage monitoring without external feedback, while closed-loop configuration with two resistors sets output voltage from 1.24 V to 18 V.
It operates down to 1.24 V cathode-anode voltage, requires ≥100 μA minimum cathode current for regulation, and maintains 0.25 Ω dynamic impedance up to 70 mA - enabling stable secondary-side regulation in 3.3 V/5 V isolated power supplies with optocoupler interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1.5% at 25°C (standard-grade C variant; defines minimum setpoint for adjustable regulation) |
| Cathode Current Range | 100 μA to 70 mA (supports low-power monitoring and robust optocoupler LED drive in SMPS) |
| Dynamic Impedance | 0.25 Ω typical (ensures tight output voltage regulation under load transients) |
| Operating Temperature | –40°C to +125°C (qualified for automotive and industrial environments without derating) |
| Output Voltage Range | 1.24 V to 18 V (set via external resistor divider; enables flexible rail monitoring and regulation) |
| Reference Input Current | 0.1–0.5 μA (ultra-low bias current minimizes divider network error and power loss) |
| Off-State Cathode Current | 0.02–0.1 μA (enables low-leakage shutdown behavior in battery-backed systems) |
Pinout & Package
TLVH431CDCKT uses the 6-pin SC-70 (DCK) package (2.00 mm × 1.25 mm), optimized for space-constrained PCB layouts. Pin 2 is substrate-connected and must be tied to ANODE or left floating per TI specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Sinks regulated current; connects to optocoupler anode or feedback network in SMPS designs |
| ANODE (Pin 2) | Common reference terminal | Typically grounded; substrate connection requires tie to ANODE or open per datasheet |
| REF (Pin 3) | Reference input sensing node | Compares external voltage to internal 1.24 V; drives amplifier when feedback loop is closed |
| NC (Pins 4, 5) | No internal connection | Unused; must remain unconnected to avoid parasitic coupling or ESD path disruption |
| Substrate (Pin 6) | Die backside connection | Internally tied to substrate; must connect to ANODE or leave open - never float independently |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-anode differential - enables use in 1.8 V–3.3 V systems where TL431 fails |
| Ultra-low reference input current | 0.1–0.5 μA - reduces resistor-divider power loss and improves accuracy in high-impedance feedback networks |
| Stable without output capacitor | Internally compensated - eliminates need for cathode-to-anode bypass cap in most applications, simplifying layout |
| Sharp turn-on characteristic | High open-loop gain enables fast comparator response - suitable for overvoltage latch or brownout detection |
| Wide cathode current range | 100 μA–70 mA supports both microamp-level monitoring and 10+ mA optocoupler drive in isolated supplies |
Applications
| Isolated Flyback SMPS Regulation | Voltage Monitoring for Power Rails |
|---|---|
Use Scenario: Secondary-side voltage regulation in 3.3 V/5 V AC-DC adapters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier - compares output-derived voltage to 1.24 V reference and modulates optocoupler LED current. Use Value: Enables precise ±1% output regulation at low voltages unreachable by TL431, with minimal component count and no external compensation. |
Use Scenario: Real-time monitoring of 1.8 V, 2.5 V, or 3.3 V system rails for fault detection or sequencing control. IC Role / Device Role / Timing Role: Precision voltage comparator with integrated reference - triggers reset or alert when rail drops below threshold. Use Value: Eliminates external reference IC and reduces BOM count; 0.1 μA reference current avoids loading sensitive LDO outputs. |
| Adjustable Data Converter Reference | Zener Diode Replacement |
Use Scenario: Programmable reference for SAR or delta-sigma ADCs requiring 1.24–5 V full-scale input range. IC Role / Device Role / Timing Role: Low-drift, low-noise adjustable reference source - sets ADC input span via resistor divider on REF pin. Use Value: 1.5% initial tolerance and <31 mV temp drift (Q-grade) exceed Zener stability; SC-70 footprint saves board area vs discrete solutions. |
Use Scenario: On-board regulation or clamping in low-power sensor nodes or battery management circuits. IC Role / Device Role / Timing Role: Active shunt regulator replacing 1.2–18 V Zener diodes - sinks current only when threshold exceeded. Use Value: 0.02 μA off-state leakage cuts standby power vs Zener reverse leakage; sharp knee improves clamping precision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDCKT | 1% reference tolerance at 25°C (vs 1.5% for TLVH431CDCKT); otherwise identical electrical specs and SC-70 package | Better initial accuracy required for high-precision ADC references or tighter SMPS regulation | Select TLVH431ACDCKT when ±1% VREF is needed; same footprint and thermal performance |
| TLVH431BIDCKR | 0.5% tolerance, –40°C to +85°C rating (I-grade), and tape-and-reel packaging (vs C-grade, –40°C to +125°C, cut tape) | Industrial temperature range suffices; higher accuracy needed for metrology or test equipment | Choose TLVH431BIDCKR for cost-sensitive industrial designs needing 0.5% accuracy without extended temp range |
Compared with TLVH431CDCKT, TLVH431ACDCKT offers tighter initial tolerance for precision applications, while TLVH431BIDCKR trades extended temperature capability for higher accuracy and reel packaging - all maintain identical SC-70 pinout and functional behavior.
Availability
TLVH431CDCKT is available at Aetrix Electronics and suitable for isolated SMPS regulation, power-rail monitoring, precision data converter references, and low-leakage Zener replacement applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431CDCKT 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and design-in support.
The TLVH431 family was designed specifically for low-voltage shunt regulation and error amplification in isolated power supplies, battery monitors, and precision reference systems - extending the TL431 architecture to 1.24 V operation with enhanced thermal stability.
FAQ
What is the reference voltage tolerance of TLVH431CDCKT at 25°C?
The TLVH431CDCKT has a reference voltage tolerance of ±1.5% at 25°C, corresponding to the standard-grade "C" suffix. This yields a VREF range of 1.21 V to 1.27 V under nominal conditions, as specified in Section 5.5 of the TI SLVS555N datasheet. The TLVH431CDCKT maintains this tolerance across its full operating temperature range of –40°C to +125°C.
Can TLVH431CDCKT operate with cathode voltage below 2.5 V?
Yes - TLVH431CDCKT is explicitly designed for low-voltage operation starting at 1.24 V cathode-to-anode voltage, unlike the TL431 which requires ≥2.5 V. This enables direct use in 1.8 V, 2.5 V, and 3.3 V systems. Operation at 1.24 V is valid provided minimum cathode current (100 μA) is met and thermal limits are observed, as confirmed in the Recommended Operating Conditions table (Section 5.3).
What is the function of Pin 2 (ANODE) in the TLVH431CDCKT SC-70 package?
In the TLVH431CDCKT's 6-pin SC-70 (DCK) package, Pin 2 is the ANODE terminal and also internally connected to the die substrate. Per TI's Pin Functions table, it must be connected to the system ground (common reference) or left open - but never left floating independently. This substrate tie ensures proper ESD protection and thermal conduction, and incorrect handling may compromise reliability or parametric performance.
How does TLVH431CDCKT achieve stability without an output capacitor?
TLVH431CDCKT incorporates internal frequency compensation, allowing stable operation without an external cathode-to-anode capacitor - a key differentiator from many linear regulators. This is validated across its full 100 μA–70 mA cathode current range and 1.24–18 V output voltage span. If added, capacitive loads must be selected using TI's phase margin curves (Figures 5-15 to 5-17) to avoid oscillation.
Is TLVH431CDCKT suitable for use with optocouplers in isolated feedback circuits?
Yes - TLVH431CDCKT is widely deployed in isolated flyback SMPS designs with optocouplers. Its 100 μA–70 mA cathode current range directly drives common optocoupler LEDs (e.g., PC817, SFH615A), and its 1.24 V reference enables regulation of outputs as low as ~2.7 V. TI Application Report SLUA671 confirms its use in UCC28600-based designs, and Figure 8-1 in the datasheet shows a validated implementation.
TLVH431CDCKT 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TLVH431CDCKT FAQ
1.How can I place an order for TLVH431CDCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431CDCKT 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 TLVH431CDCKT reliable?
The price and inventory of TLVH431CDCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431CDCKT is usually 5 days.
3.What payment methods are accepted for TLVH431CDCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431CDCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431CDCKT?
TLVH431CDCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431CDCKT 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 TLVH431CDCKT?
For technical support, including TLVH431CDCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431CDCKT requirements.
6.How does Aetrix verify that TLVH431CDCKT is sourced from the original manufacturer or authorized distributors?
All TLVH431CDCKT 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 TLVH431CDCKT meets industry standards.
7.What is the process for return or replacement of TLVH431CDCKT?
All TLVH431CDCKT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431CDCKT, 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 TLVH431CDCKT part is unused and in its original packaging.
Return procedure for TLVH431CDCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431CDCKT Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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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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