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Texas Instruments TLVH431AILPR
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- Part No.:
- TLVH431AILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431AILPR.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:495
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Product details
Overview
TLVH431AILPR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±1% initial tolerance at 25°C (A-grade), and operation down to 100 μA cathode current. It functions as a programmable Zener replacement or integrated-reference comparator in isolated feedback paths of 3.3 V flyback SMPSs.
For engineers reviewing the TLVH431AILPR datasheet, TLVH431AILPR pinout, TLVH431AILPR application, or TLVH431AILPR equivalent, key selection criteria include its 1.24 V minimum output voltage setting, 0.25 Ω typical dynamic impedance, –40°C to +125°C operating range, and TO-92 package compatibility for through-hole power rail monitoring and secondary-side regulation.
Technical Context
The TLVH431AILPR implements a bandgap-referenced error amplifier with internal 1.24 V reference and Darlington output stage, enabling precise shunt regulation via external resistor divider feedback between cathode and reference pins. Its open-loop gain supports comparator-mode operation with integrated threshold.
It operates with cathode-to-anode voltage from 1.24 V to 18 V and requires ≥100 μA cathode current for stable regulation. The device is internally compensated and remains stable without an output capacitor, though capacitive load stability margins are characterized up to 100 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets minimum programmable output; enables regulation below 2.5 V unlike TL431 |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power biasing and high-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight voltage regulation under varying load conditions |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments (Q-grade thermal range) |
| Output Voltage Range | VREF to 18 V - adjustable via two external resistors; supports wide-range power rail sensing |
| Reference Input Current | 0.1–0.5 μA - minimizes divider network loading and improves accuracy in high-impedance designs |
| Off-State Cathode Current | 0.02–0.1 μA - enables low-leakage shutdown behavior in power-monitoring applications |
Pinout & Package
TLVH431AILPR uses the 3-pin TO-92 package (4.30 mm × 4.30 mm body), optimized for through-hole mounting and thermal dissipation in linear regulation applications. Pin assignments are standardized across TO-92 variants.
| 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 point in SMPS circuits |
| ANODE (Pin 2) | Common return / ground reference | Typically tied to system ground or power rail common; serves as voltage reference point for cathode and REF terminals |
| REF (Pin 3) | Threshold sense input | Compares external voltage against internal 1.24 V reference; requires ≤0.5 μA bias current; must not be left floating |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 cannot function |
| Ultra-low IK(min) | 100 μA minimum cathode current - reduces standby power in always-on monitoring circuits |
| Integrated reference + amplifier | Single-device comparator functionality - eliminates need for external reference and op-amp in voltage detection |
| Stability without output capacitor | No mandatory COUT required - simplifies layout and avoids capacitor aging or ESR-related drift in long-life designs |
| Zener diode replacement | 0.02 μA off-state leakage - outperforms standard Zeners in low-power rail supervision and battery-backed circuits |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPSs |
|---|---|
Use Scenario: Provides precise, temperature-stable reference voltage for SAR and delta-sigma ADCs in industrial data acquisition modules. IC Role / Device Role / Timing Role: Shunt regulator configured as programmable reference source; REF pin biased via precision divider to set exact VREF. Use Value: 1.24 V base reference with ±1% tolerance and <31 mV full-range drift ensures <0.05% INL contribution in 16-bit converter designs. |
Use Scenario: Implements isolated feedback loop in 3.3 V/1 A flyback converter using optocoupler-coupled TLVH431AILPR on secondary side. IC Role / Device Role / Timing Role: Error amplifier + reference; compares sampled output against internal 1.24 V and drives optocoupler LED current. Use Value: Enables regulation as low as 2.7 V output (1.24 V + opto VF) while maintaining stability across –40°C to +125°C ambient. |
| Zener Replacement with Low Leakage | Voltage Monitoring for Power Rails |
Use Scenario: Replaces 2.4 V Zener diode in 3.3 V microcontroller reset circuit with tighter tolerance and lower temperature coefficient. IC Role / Device Role / Timing Role: Precision shunt clamp; configured with fixed resistor to sink current when rail exceeds threshold. Use Value: 0.02 μA off-state leakage reduces quiescent current by >95% vs. typical Zener, extending battery life in portable devices. |
Use Scenario: Monitors 5 V and 12 V rails in telecom line cards for brownout detection and fault logging. IC Role / Device Role / Timing Role: Comparator with integrated reference; REF pin tied to divided rail voltage; cathode pulled high to flag overvoltage. Use Value: Sharp turn-on characteristic and 1.24 V reference allow accurate 4.8 V–5.2 V window detection without external components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BILPR | 0.5% initial reference tolerance (vs. 1% for TLVH431AILPR); otherwise identical electrical specs and TO-92 packaging | Suitable where higher initial accuracy is required for calibration-critical references or high-resolution DAC biasing | Select TLVH431BILPR when ±0.5% VREF tolerance is mandated; same footprint and thermal profile |
| TLVH432AILP | Same A-grade tolerance and electrical specs, but SOT-89-3 package (4.5 mm × 2.5 mm) with reversed pinout: Cathode–REF–Anode | Better suited for surface-mount, space-constrained PCBs; requires layout revision due to different pin assignment | Choose TLVH432AILP for automated assembly and higher power dissipation (52°C/W θJA vs. 140°C/W for TO-92) |
Compared with TLVH431BILPR, TLVH431AILPR trades 0.5% initial accuracy for cost efficiency in non-calibrated applications; compared with TLVH432AILP, it offers through-hole reliability and simpler hand-soldering but lower power handling and larger board area.
Availability
TLVH431AILPR is available at Aetrix Electronics and suitable for industrial power supplies, telecom voltage supervisors, and embedded analog front-ends requiring stable component supply across extended temperature ranges.
Supply support for TLVH431AILPR 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision reference design.
The TLVH431 family was developed to extend low-voltage shunt regulation capability beyond TL431, targeting 1.24 V–18 V programmable references for isolated SMPS, data converter biasing, and power-rail monitoring in automotive and industrial systems.
FAQ
What is the reference voltage tolerance of TLVH431AILPR at 25°C?
The TLVH431AILPR 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 specification is confirmed in Section 5.6 of the official TI datasheet SLVS555N and applies across all package variants including the TO-92 TLVH431AILPR.
Can TLVH431AILPR operate with cathode current below 100 μA?
No - TLVH431AILPR requires a minimum cathode current of 100 μA to maintain regulation and specified reference accuracy. Below this threshold, open-loop gain drops significantly, causing poor regulation and increased VREF deviation. The datasheet specifies IK(min) = 60–100 μA depending on grade and temperature, with 100 μA as the guaranteed maximum for A-grade devices at full range.
What is the maximum cathode-to-anode voltage for TLVH431AILPR?
The absolute maximum cathode-to-anode voltage (VKA) for TLVH431AILPR is 20 V, per Section 5.1 Absolute Maximum Ratings. For reliable continuous operation, the recommended maximum is 18 V, as stated in Section 5.3 Recommended Operating Conditions and used throughout the electrical characteristics tables for VKA testing.
Does TLVH431AILPR require an output capacitor for stability?
No - TLVH431AILPR is internally compensated and stable without an output capacitor between cathode and anode. This is explicitly noted in Section 7.3 Feature Description. However, if a capacitor is added for noise filtering or transient response, Figures 5-15 to 5-17 provide phase-margin guidance for loads up to 100 nF.
How does TLVH431AILPR differ from TLVH432AILP in pin configuration?
TLVH431AILPR (TO-92) uses Cathode–Anode–REF pin order, while TLVH432AILP (SOT-89) uses Cathode–REF–Anode. This reversal means direct PCB substitution is not possible without layout modification. Both share identical electrical specifications and A-grade tolerance, but differ in thermal resistance (140°C/W vs. 52°C/W) and mounting method.
TLVH431AILPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- 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%
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431AILPR FAQ
1.How can I place an order for TLVH431AILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431AILPR 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 TLVH431AILPR reliable?
The price and inventory of TLVH431AILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431AILPR is usually 5 days.
3.What payment methods are accepted for TLVH431AILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431AILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431AILPR?
TLVH431AILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431AILPR 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 TLVH431AILPR?
For technical support, including TLVH431AILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431AILPR requirements.
6.How does Aetrix verify that TLVH431AILPR is sourced from the original manufacturer or authorized distributors?
All TLVH431AILPR 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 TLVH431AILPR meets industry standards.
7.What is the process for return or replacement of TLVH431AILPR?
All TLVH431AILPR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431AILPR, 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 TLVH431AILPR part is unused and in its original packaging.
Return procedure for TLVH431AILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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