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Texas Instruments TLVH431IPK
- Part No.:
- TLVH431IPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH431IPK.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,540
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Product details
Overview
TLVH431IPK from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, functioning as a 1.24 V reference with ±0.5% initial tolerance (B-grade), 100 μA minimum cathode current, 0.25 Ω dynamic impedance, and operation from –40°C to +125°C. It replaces Zener diodes in isolated flyback SMPS secondary-side regulation and voltage monitoring circuits.
For engineers reviewing the TLVH431IPK datasheet, TLVH431IPK pinout, TLVH431IPK application, or TLVH431IPK equivalent, key selection criteria include reference voltage accuracy at temperature extremes, cathode current headroom for stable regulation, dynamic impedance impact on loop stability, and SOT-89 thermal performance in power-constrained designs.
Technical Context
The TLVH431IPK implements an internal bandgap reference and high-gain NPN-based error amplifier driving a Darlington sink output stage. Its open-loop comparator mode enables precise voltage monitoring without external references, 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-to-anode voltage, requires ≥100 μA cathode current for regulation, and maintains 0.25 Ω typical dynamic impedance across 0.1 mA–70 mA cathode current range. Thermal drift is specified as ±11 mV over –40°C to +125°C for Q-grade variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C; defines minimum regulation voltage and sets feedback divider ratio |
| Cathode Current Range | 100 μA to 70 mA; determines minimum bias for regulation and maximum shunt capability |
| Dynamic Impedance | 0.25 Ω typical; directly impacts closed-loop AC stability and ripple rejection in feedback networks |
| Operating Temperature | –40°C to +125°C; supports automotive under-hood and industrial control environments |
| Output Voltage Range | VREF to 18 V; enables programmable regulation via external resistor divider without additional components |
| Reference Input Current | 0.1–0.5 μA; low leakage minimizes divider current error and improves accuracy at high resistance values |
| Thermal Drift (VREF) | ±11 mV over full temperature range; translates to ~9 ppm/°C average TC for precision applications |
Pinout & Package
SOT-89-3 package with 4.50 mm × 2.50 mm body size, exposed thermal pad for enhanced power dissipation (RθJA = 52°C/W), and standard 3-pin layout optimized for high-current shunt regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary current path; sinks regulated current to ANODE; connects to optocoupler LED anode in isolated SMPS |
| ANODE (Pin 2) | Common return / ground reference | Low-impedance return path; must be connected to system ground or power rail common point |
| REF (Pin 3) | Feedback threshold input | Senses voltage divider output; clamped to 1.24 V when regulating; requires ≥0.1 μA bias current |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode differential-enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Sharp turn-on characteristic | High open-loop gain ensures fast transition between off-state and regulation-critical for comparator-mode voltage monitoring |
| No external compensation required | Internally compensated for stability with no output capacitor needed-reduces BOM count and PCB area in space-constrained designs |
| Zener replacement capability | Ultra-low 0.02–0.1 μA off-state cathode current enables true low-leakage voltage clamping vs. conventional Zeners |
| Multiple grade options | B-grade (±0.5%) provides metrology-grade accuracy; A-grade (±1%) balances cost and performance for industrial power supplies |
Applications
| Secondary-Side Regulation in Isolated Flyback SMPS | Adjustable Voltage Reference for Data Converters |
|---|---|
Use Scenario: Used with optocoupler in feedback path of 3.3 V isolated flyback converter to regulate output voltage tightly across line/load/temperature. IC Role / Device Role / Timing Role: Acts as error amplifier and precision reference-compares sampled output against internal 1.24 V reference and drives optocoupler LED current. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto VF), supports wide input ranges, and achieves <±1% total output tolerance over –40°C to +125°C. | Use Scenario: Provides stable, adjustable reference voltage for SAR and delta-sigma ADCs in battery-powered instrumentation. IC Role / Device Role / Timing Role: Functions as programmable reference source-external resistor divider sets exact VREF to match ADC full-scale range (e.g., 2.048 V, 4.096 V). Use Value: 0.1–0.5 μA reference input current minimizes divider power loss; ±0.5% initial tolerance ensures absolute accuracy without calibration. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
Use Scenario: Monitors 1.8 V, 2.5 V, or 3.3 V supply rails in FPGA, microcontroller, or ASIC systems for brown-out detection. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode-REF pin tied to monitored rail via resistor divider; CATHODE pulled high to generate logic-level alert. Use Value: Eliminates need for external reference IC; ±0.5% threshold accuracy ensures reliable fault detection at critical voltage margins. | Use Scenario: Implements level-shifting or window-comparator circuits in analog front-ends and sensor interfaces. IC Role / Device Role / Timing Role: Functions as self-contained comparator-internal 1.24 V reference compared against external signal applied to REF pin. Use Value: 100 μA minimum cathode current requirement ensures fast response; sharp turn-on enables clean digital transitions without hysteresis circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBZ | SOT-23-3 package; 2.92 mm × 1.30 mm footprint; RθJA = 206°C/W; same electrical specs | Better suited for ultra-dense layouts but lower thermal performance; limited to ≤300 mW continuous dissipation | Select TLVH431IDBZ only when board space is constrained and power dissipation remains below 150 mW. |
| TLVH432IPK | Identical SOT-89-3 package but reversed pinout (CATHODE/REF/ANODE → REF/ANODE/CATHODE); same electrical specs | Requires PCB layout revision; incompatible with TLVH431IPK footprint without trace modification | Choose TLVH432IPK only if redesigning for alternate feedback topology or legacy schematic compatibility. |
Compared with TLVH431IDBZ, TLVHH431IPK delivers superior thermal management in high-current regulation due to its larger SOT-89 thermal pad and 52°C/W junction-to-ambient rating; versus TLVH432IPK, it offers direct drop-in replacement capability without layout changes but requires attention to pin 1–3 signal routing directionality.
Availability
TLVH431IPK is available at Aetrix Electronics and suitable for isolated flyback SMPS, precision data converter references, and power-rail monitoring applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431IPK 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 for industrial, automotive, and consumer markets.
The TLVH431 product line was designed as a low-voltage, high-accuracy replacement for TL431 in space- and power-constrained applications-targeting secondary-side regulation, precision references, and integrated-comparator functions.
FAQ
What is the reference voltage tolerance of TLVH431IPK at 25°C?
The TLVH431IPK has a reference voltage tolerance of ±0.5% at 25°C, corresponding to the 'B' grade designation. This means its VREF falls within 1.234 V to 1.246 V at room temperature, enabling high-accuracy voltage setting in feedback networks and reference circuits without trimming.
How does TLVH431IPK differ from TL431 in low-voltage operation?
The TLVH431IPK operates down to 1.24 V cathode-to-anode voltage and requires only 100 μA minimum cathode current, whereas TL431 needs ≥2.5 V and ≥1 mA. This allows TLVH431IPK to regulate 1.8 V and 2.5 V rails directly-making it suitable for modern low-power systems where TL431 cannot function.
What is the maximum cathode voltage rating for TLVH431IPK?
The absolute maximum cathode voltage for TLVH431IPK is 20 V relative to the ANODE pin. In normal operation, the recommended cathode voltage range is VREF to 18 V, supporting adjustable output configurations up to 18 V using external resistors while maintaining safe margin below the absolute limit.
Can TLVH431IPK be used without an output capacitor?
Yes, TLVH431IPK is internally compensated and stable without an output capacitor between CATHODE and ANODE. This eliminates capacitor-related BOM cost and layout complexity. However, if an output capacitor is added for filtering, Figures 5-15–5-17 in the datasheet guide selection to maintain phase margin above 45°.
What is the thermal resistance (RθJA) of TLVH431IPK in SOT-89 package?
The junction-to-ambient thermal resistance of TLVH431IPK in SOT-89 package is 52°C/W, measured with standard JEDEC 2-layer board conditions. This value enables continuous power dissipation up to ~350 mW at 25°C ambient, making it suitable for medium-current shunt regulation in thermally demanding environments.
TLVH431IPK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- 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:
- SOT-89-3
TLVH431IPK FAQ
1.How can I place an order for TLVH431IPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431IPK 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 TLVH431IPK reliable?
The price and inventory of TLVH431IPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431IPK is usually 5 days.
3.What payment methods are accepted for TLVH431IPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431IPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431IPK?
TLVH431IPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431IPK 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 TLVH431IPK?
For technical support, including TLVH431IPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431IPK requirements.
6.How does Aetrix verify that TLVH431IPK is sourced from the original manufacturer or authorized distributors?
All TLVH431IPK 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 TLVH431IPK meets industry standards.
7.What is the process for return or replacement of TLVH431IPK?
All TLVH431IPK units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431IPK, 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 TLVH431IPK part is unused and in its original packaging.
Return procedure for TLVH431IPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431IPK Tags
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