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Texas Instruments TLVH431AIPKG3
- Part No.:
- TLVH431AIPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH431AIPKG3.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
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Product details
Overview
TLVH431AIPKG3 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, featuring 1.24 V reference voltage (±1% at 25°C), 100 μA minimum cathode current for regulation, and operation from –40°C to +125°C. It functions as a programmable voltage reference or comparator with integrated 1.24 V bandgap reference, commonly used in isolated flyback SMPS feedback loops and on-board voltage monitoring circuits.
For engineers reviewing the TLVH431AIPKG3 datasheet, TLVH431AIPKG3 pinout, TLVH431AIPKG3 application, or TLVH431AIPKG3 equivalent, key selection criteria include reference accuracy grade (A = 1%), cathode current range (100 μA–70 mA), dynamic impedance (0.25 Ω typical), thermal stability over industrial/automotive temperature ranges, and compatibility with optocoupler-based isolated feedback topologies.
Technical Context
The TLVH431AIPKG3 implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop operation enables precise comparator functionality with built-in reference, while closed-loop configuration with external resistive divider allows adjustable output voltage from 1.24 V to 18 V.
Unlike the TL431, it operates down to 1.24 V cathode-anode voltage and supports cathode currents as low as 100 μA-enabling efficient regulation in ultra-low-power 3.3 V and 2.5 V systems. The device is internally compensated and stable without output capacitance, though phase margin vs. capacitive load curves are provided for designs requiring added filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1% at 25°C - sets minimum programmable output; defines threshold for comparator mode |
| Cathode Current Range | 100 μA to 70 mA - enables regulation in ultra-low-power systems and handles moderate load transients |
| Dynamic Impedance | 0.25 Ω typical - ensures tight voltage regulation under varying cathode current conditions |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments without derating |
| Output Voltage Range | 1.24 V to 18 V (adjustable via two external resistors) - supports wide-range power rail monitoring and regulation |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and improves accuracy in high-impedance feedback networks |
| Line Regulation (ΔVREF/ΔVKA) | –1.5 to –2.7 mV/V - quantifies reference stability against cathode voltage variation; critical for high-accuracy references |
Pinout & Package
SOT-89-3 package: 4.50 mm × 2.50 mm body, surface-mount, thermally enhanced with exposed tab connected to ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary current path; sinks regulated current when REF voltage exceeds 1.24 V; connects to feedback network or optocoupler LED anode |
| REF (Pin 2) | Reference input / sensing node | High-impedance input comparing external voltage to internal 1.24 V reference; must be biased with ≥0.1 μA for proper operation |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance connection point; ties to system ground or power return; exposed tab is electrically connected to this pin for thermal conduction |
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 function |
| Ultra-low IK(min) | 100 μA minimum cathode current - reduces standby power in always-on monitoring and isolated feedback circuits |
| Integrated comparator + reference | No external reference required - simplifies voltage-monitoring designs by eliminating discrete reference ICs or Zener diodes |
| Stable without output capacitor | Internally compensated - eliminates need for external stabilization capacitor in most applications, reducing BOM count |
| Automotive-grade temp range | –40°C to +125°C operation - meets AEC-Q100 stress test requirements for under-hood and powertrain applications |
Applications
| Isolated Flyback SMPS Feedback | Voltage Rail Monitoring |
|---|---|
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 output-derived voltage to 1.24 V reference and modulates optocoupler LED current. Use Value: Enables regulation as low as 2.7 V output (1.24 V + optocoupler VF), supporting modern low-voltage rails with <±1% initial accuracy and <31 mV total VREF drift over –40°C to +125°C. |
Use Scenario: Real-time detection of undervoltage/overvoltage conditions on microcontroller I/O supply rails (e.g., 3.3 V or 5 V). IC Role / Device Role / Timing Role: Precision comparator with integrated reference - triggers reset or fault signal when rail deviates beyond set thresholds. Use Value: Eliminates external reference and comparator; achieves <100 ns response time with 0.5 μA IREF loading, minimizing impact on monitored rail stability. |
| Adjustable Linear Regulator Reference | Zener Diode Replacement |
Use Scenario: Setting precise output voltage in series-pass linear regulators (e.g., with PNP pass transistor). IC Role / Device Role / Timing Role: Programmable reference source - establishes regulated output via resistive divider between cathode and REF pins. Use Value: Delivers 1.24–18 V adjustability with 0.25 Ω dynamic impedance, improving load regulation by >10× versus standard Zener diodes. |
Use Scenario: Replacing 2.5 V or 3.3 V Zener diodes in low-leakage bias networks and precision clamping circuits. IC Role / Device Role / Timing Role: Active shunt reference - provides sharp turn-on knee and <0.1 μA off-state cathode current at 18 V. Use Value: Reduces leakage current by 100× versus 5% tolerance Zeners, enabling accurate biasing in high-impedance sensor interfaces and battery-powered systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACPK | Same SOT-89-3 package, but C-grade (0°C to 70°C) and 1.5% VREF tolerance at 25°C | Limited to commercial-temperature applications; lower accuracy acceptable in non-critical biasing | Select when cost sensitivity outweighs automotive/industrial temperature or 1% accuracy requirements |
| TLVH431BIPKG3 | Same SOT-89-3 package and –40°C to +125°C rating, but B-grade (0.5% VREF tolerance at 25°C) | Higher accuracy needed for precision ADC references or metrology-grade monitoring | Choose when tighter initial reference tolerance is mandatory and budget allows premium grade |
Compared with TLVH431ACPK, TLVH431AIPKG3 offers extended temperature range and improved accuracy; compared with TLVH431BIPKG3, it trades 0.5% tolerance for lower unit cost while retaining full automotive qualification-making it optimal for cost-sensitive, high-reliability power management designs.
Availability
TLVH431AIPKG3 is available at Aetrix Electronics and suitable for isolated flyback SMPS feedback, voltage rail monitoring, and adjustable linear regulator reference applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431AIPKG3 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.
The TLVH431 family was designed specifically for low-voltage shunt regulation and integrated reference applications-targeting isolated power supplies, voltage supervision, and Zener replacement in space-constrained, thermally demanding systems.
FAQ
What is the reference voltage tolerance of TLVH431AIPKG3 at 25°C?
The TLVH431AIPKG3 has a reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 1.24 V output ranging from 1.228 V to 1.252 V under specified test conditions (VKA = VREF, IK = 10 mA). This A-grade accuracy is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies across all temperature grades of the TLVH431A variant.
Can TLVH431AIPKG3 operate in a 1.8 V system?
Yes, TLVH431AIPKG3 can operate in a 1.8 V system because its minimum cathode-anode operating voltage is 1.24 V. When configured as a shunt regulator with appropriate external resistors, it regulates output voltages as low as 1.24 V; in comparator mode, it functions with cathode voltage ≥1.24 V, making it compatible with 1.8 V rail monitoring and feedback applications.
What is the minimum cathode current required for regulation in TLVH431AIPKG3?
The TLVH431AIPKG3 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 of the datasheet under IK(min). Below this threshold, gain drops significantly and regulation becomes unreliable. This value is valid across the full –40°C to +125°C temperature range for the Q-grade version packaged in TLVH431AIPKG3.
How does TLVH431AIPKG3 differ from TL431 in practical design?
TLVH431AIPKG3 differs from TL431 by supporting lower operating voltage (1.24 V vs. 2.5 V reference), lower minimum cathode current (100 μA vs. 1 mA), and wider temperature range (–40°C to +125°C vs. typically –40°C to +85°C). These differences enable TLVH431AIPKG3 to regulate in 1.8 V–3.3 V systems and reduce standby power in always-on monitoring circuits where TL431 would not function.
Is an output capacitor required for stability with TLVH431AIPKG3?
No, TLVH431AIPKG3 is internally compensated and stable without an output capacitor between cathode and anode. However, if a capacitor is added for noise filtering or transient suppression, Figures 5-15 through 5-17 in the datasheet provide phase margin vs. capacitive load data for VKA = 1.25 V, 2.5 V, and 5.0 V-allowing designers to select values that maintain ≥45° phase margin.
TLVH431AIPKG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TLVH431AIPKG3 FAQ
1.How can I place an order for TLVH431AIPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AIPKG3 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 TLVH431AIPKG3 reliable?
The price and inventory of TLVH431AIPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AIPKG3 is usually 5 days.
3.What payment methods are accepted for TLVH431AIPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AIPKG3 transactions.
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4.How is shipping managed for TLVH431AIPKG3?
TLVH431AIPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AIPKG3 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 TLVH431AIPKG3?
For technical support, including TLVH431AIPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AIPKG3 requirements.
6.How does Aetrix verify that TLVH431AIPKG3 is sourced from the original manufacturer or authorized distributors?
All TLVH431AIPKG3 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 TLVH431AIPKG3 meets industry standards.
7.What is the process for return or replacement of TLVH431AIPKG3?
All TLVH431AIPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AIPKG3, 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 TLVH431AIPKG3 part is unused and in its original packaging.
Return procedure for TLVH431AIPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431AIPKG3 Tags
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