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Texas Instruments TLVH431ACDCKTG4
- Part No.:
- TLVH431ACDCKTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431ACDCKTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
TLVH431ACDCKTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70-6 package, featuring 1.24 V reference voltage (±1% 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 TLVH431ACDCKTG4 datasheet, TLVH431ACDCKTG4 pinout, TLVH431ACDCKTG4 application, or TLVH431ACDCKTG4 equivalent, key selection criteria include reference accuracy grade (A = 1%), SC-70 footprint constraints, cathode current headroom for regulation stability, and compatibility with optocoupler-based secondary-side control in 3.3 V systems.
Technical Context
The TLVH431ACDCKTG4 implements a precision bandgap reference and high-gain NPN-based error amplifier in a 3-terminal shunt topology. Its internal architecture enables closed-loop regulation via resistive feedback between cathode and reference pins, or open-loop comparator operation with integrated 1.24 V threshold.
It operates down to 1.24 V cathode-anode voltage, requires ≥100 μA minimum cathode current for regulation, and maintains stable performance across –40°C to +125°C without external compensation-unlike many linear regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets precise regulation point for external resistor divider networks |
| Cathode Current Range | 100 μA to 70 mA - defines minimum bias for regulation onset and maximum power dissipation capability |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients |
| Operating Temperature | –40°C to +125°C - supports automotive and industrial environments without derating |
| Reference Input Current | 0.1–0.5 μA - enables high-impedance feedback networks with minimal loading error |
| Output Voltage Range | VREF to 18 V - adjustable via two external resistors, enabling flexible system-level voltage setting |
| Thermal Resistance (RθJA) | 259 °C/W - determines maximum power dissipation in SC-70 package at ambient temperature |
Pinout & Package
TLVH431ACDCKTG4 uses the SC-70-6 (DCK) package (2.00 mm × 1.25 mm), with pin 2 internally connected to substrate and requiring connection to ANODE or left open per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input | Sinks regulated current; voltage at this node is set by external feedback network |
| ANODE (Pin 6) | Common reference terminal | Typically grounded; serves as return path for cathode current and reference bias |
| REF (Pin 3) | Threshold input | Compares against internal 1.24 V reference; feedback connection point for regulation |
| NC (Pins 4, 5) | No internal connection | Unused; must be left unconnected or tied to ANODE per layout best practice |
| Substrate (Pin 2) | Internal die attachment | Must be connected to ANODE or left floating-never driven independently |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode voltage-enables use in 1.8 V and 3.3 V systems where TL431 fails |
| Ultra-small SC-70 package | 40% smaller footprint than SOT-23-3-critical for space-constrained power management PCBs |
| Integrated reference + amplifier | Eliminates need for external voltage reference and op-amp in comparator or error amplifier configurations |
| Stable without output capacitor | Internally compensated-reduces BOM count and avoids stability issues from capacitor ESR/aging |
| Low reference input current | ≤0.5 μA max-permits use of >1 MΩ feedback resistors, minimizing power loss and thermal drift |
Applications
| Secondary-Side Regulation in Isolated Flyback SMPS | Zener Diode Replacement in Low-Voltage Rails |
|---|---|
Use Scenario: Used with optocoupler on secondary side of 3.3 V isolated flyback converter to regulate output voltage and feed error signal to primary-side controller. IC Role / Device Role / Timing Role: Acts as adjustable shunt regulator and error amplifier-compares sampled output voltage against 1.24 V reference and modulates optocoupler LED current. Use Value: Enables regulation as low as 2.7 V output while maintaining <1% reference accuracy over –40°C to +125°C. | Use Scenario: Replaces discrete 2.5 V Zener diodes in 3.3 V microcontroller I/O rail monitoring and LDO feedback paths. IC Role / Device Role / Timing Role: Functions as precision shunt element-clamps voltage using external resistor divider, with sharp turn-on characteristic and low leakage (<0.1 μA off-state). Use Value: Reduces leakage current by >10× versus standard Zeners, improving standby power in battery-backed systems. |
| Adjustable Voltage Reference for Data Converters | Voltage Monitoring for Power Rails |
Use Scenario: Provides programmable reference voltage for SAR ADCs and DACs in industrial sensor signal chains requiring 1.24–5 V full-scale range. IC Role / Device Role / Timing Role: Serves as stable, low-drift voltage source-configured with precision resistors to generate exact reference levels independent of supply variation. Use Value: Delivers ±1% initial accuracy and <31 mV total deviation over temperature-meeting 12-bit converter linearity requirements. | Use Scenario: Monitors 5 V and 12 V power rails in telecom equipment to trigger reset or alert when voltage falls outside ±5% window. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode-reference pin tied to divided rail voltage; cathode drives logic-level output via pull-up. Use Value: Integrates accurate 1.24 V threshold and high open-loop gain-eliminates external comparator and reference ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDCKR | 0.5% reference tolerance (B grade) vs 1% (A grade); identical SC-70-6 package and electrical specs | Better accuracy required for high-resolution data acquisition or metrology-grade references | Select when tighter initial VREF tolerance is critical and cost premium is acceptable |
| TLVH432ACDBVR | SOT-23-5 package (vs SC-70-6); same A-grade accuracy and 1.24 V reference, but different pinout and thermal resistance (206 °C/W) | Preferred for designs already using SOT-23 footprints or needing higher power dissipation capability | Choose when board layout rework is feasible and thermal margin above 259 °C/W is needed |
Compared with TLVH431BIDCKR, TLVH431ACDCKTG4 trades 0.5% accuracy for lower cost; compared with TLVH432ACDBVR, it offers 40% smaller footprint and higher thermal resistance-favoring space-constrained, low-power applications over thermal-heavy ones.
Availability
TLVH431ACDCKTG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS design, precision voltage monitoring, and low-voltage reference generation requiring stable component supply across automotive, industrial, and telecom production programs.
Supply support for TLVH431ACDCKTG4 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 and embedded processing solutions, with deep expertise in precision analog, power management, and signal chain technologies.
The TLVH431 family was designed specifically for low-voltage shunt regulation and error amplification in isolated power supplies, battery monitors, and data converter references-addressing limitations of legacy TL431 in sub-2.5 V systems.
FAQ
What is the reference voltage tolerance of TLVH431ACDCKTG4 at 25°C?
The TLVH431ACDCKTG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.228 V to 1.252 V. This A-grade accuracy is confirmed in Section 5.6 of the TI datasheet SLVS555N. The device maintains this specification across its full operating temperature range when used within recommended conditions. TLVH431ACDCKTG4 achieves this via laser-trimmed bandgap circuitry and is validated per TI's production test flow.
Can TLVH431ACDCKTG4 operate with cathode-to-anode voltage below 2.5 V?
Yes, TLVH431ACDCKTG4 is explicitly designed for low-voltage operation down to 1.24 V cathode-to-anode voltage-significantly lower than the 2.5 V minimum of TL431. This enables direct use in 1.8 V and 3.3 V systems without level-shifting. Operation requires ≥100 μA cathode current and proper feedback configuration. TLVH431ACDCKTG4's internal architecture sustains regulation and sharp turn-on behavior even at this reduced headroom.
What is the function of Pin 2 (substrate) on TLVH431ACDCKTG4?
Pin 2 on TLVH431ACDCKTG4 is the internal substrate connection and must be connected to the ANODE terminal or left electrically open-it must never be driven independently or tied to a different potential. This requirement is specified in the Pin Functions table and Figure 4-2 of the datasheet. Failure to follow this guideline may cause parametric shift or instability. TLVH431ACDCKTG4's SC-70 package design mandates this connection for proper thermal and electrical behavior.
How does TLVH431ACDCKTG4 differ from TLVH432 variants?
TLVH431ACDCKTG4 and TLVH432 share identical electrical specifications-including reference voltage, cathode current range, and dynamic impedance-but differ in pinout. TLVH431ACDCKTG4 uses SC-70-6 with CATHODE/ANODE/REF on Pins 1/6/3; TLVH432 variants use alternate pinouts (e.g., REF/CATHODE/ANODE in SOT-23-3). TLVH431ACDCKTG4 is not pin-compatible with TLVH432 packages. Functional equivalence exists only when circuit layout accommodates the specific DCK pin assignment.
Is an output capacitor required for stability with TLVH431ACDCKTG4?
No, TLVH431ACDCKTG4 is internally compensated and stable without an output capacitor between cathode and anode-unlike many linear regulators. This eliminates BOM cost and layout complexity. However, if an output capacitor is added for noise filtering, Figures 5-15 to 5-17 in the datasheet provide phase-margin guidance versus capacitive load. TLVH431ACDCKTG4's stability is verified across its full operating range under recommended conditions.
TLVH431ACDCKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1%
- 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
TLVH431ACDCKTG4 FAQ
1.How can I place an order for TLVH431ACDCKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDCKTG4 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 TLVH431ACDCKTG4 reliable?
The price and inventory of TLVH431ACDCKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDCKTG4 is usually 5 days.
3.What payment methods are accepted for TLVH431ACDCKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACDCKTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ACDCKTG4?
TLVH431ACDCKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDCKTG4 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 TLVH431ACDCKTG4?
For technical support, including TLVH431ACDCKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDCKTG4 requirements.
6.How does Aetrix verify that TLVH431ACDCKTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDCKTG4 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 TLVH431ACDCKTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431ACDCKTG4?
All TLVH431ACDCKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDCKTG4, 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 TLVH431ACDCKTG4 part is unused and in its original packaging.
Return procedure for TLVH431ACDCKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACDCKTG4 Tags
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