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Texas Instruments TLVH431ILPR
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- Part No.:
- TLVH431ILPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431ILPR.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TLVH431ILPR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance (B-grade), and operation down to 100 µA cathode current. It functions as a programmable Zener replacement or error amplifier in isolated feedback loops, supporting output voltages from 1.24 V to 18 V via two external resistors. Used in 3.3 V flyback SMPS secondary-side regulation and voltage monitoring rails.
For engineers reviewing the TLVH431ILPR datasheet, TLVH431ILPR pinout, TLVH431ILPR application, or TLVH431ILPR equivalent, key selection criteria include its 1.24 V reference accuracy, ultra-low 100 µA minimum cathode current, 0.25 Ω dynamic impedance, –40°C to +125°C operating range, and TO-92 package compatibility for through-hole power supply designs.
Technical Context
The TLVH431ILPR implements a bandgap-referenced error amplifier with internal 1.24 V reference and Darlington output stage, enabling sharp turn-on and stable shunt regulation without external compensation. Its open-loop comparator mode supports voltage monitoring, while closed-loop configuration with resistive feedback delivers precise adjustable output voltage control.
It operates with cathode-to-anode voltage (VKA) from 1.24 V to 18 V and cathode current (IK) from 100 µA to 70 mA. Thermal stability is specified across –40°C to +125°C (Q-grade), with typical output impedance of 0.25 Ω and reference input current below 0.5 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets precise regulation threshold for feedback networks |
| Min Cathode Current (IK(min)) | 100 µA - enables regulation in ultra-low-power applications where TL431 fails |
| Dynamic Impedance (|zKA|) | 0.25 Ω typical - ensures tight voltage regulation under load transients |
| Operating Temperature Range | –40°C to +125°C - qualified for automotive and industrial environments |
| Cathode Voltage Range (VKA) | 1.24 V to 18 V - supports wide-output adjustable references without external op-amps |
| Reference Input Current (Iref) | 0.1 µA to 0.5 µA - minimizes resistor-divider loading error in high-impedance feedback |
| Output Voltage Adjustment | Programmable from VREF to 18 V using R1/R2 divider - replaces discrete Zener + op-amp solutions |
Pinout & Package
TLVH431ILPR uses a 3-pin TO-92 package (4.30 mm × 4.30 mm body) with through-hole mounting. Pin 1 is CATHODE, Pin 2 is ANODE, and Pin 3 is REF - no NC or substrate pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current sink input | Primary current path; connects to regulated output node or optocoupler LED anode in isolated supplies |
| ANODE (Pin 2) | Common return/reference ground | Typically tied to system ground or power rail return; defines voltage reference point for VKA |
| REF (Pin 3) | Feedback threshold input | Senses divided output voltage; forces cathode current to maintain 1.24 V at this pin in closed loop |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage reference | 1.24 V operation enables regulation in 1.8 V/2.5 V/3.3 V systems where TL431 (2.5 V) cannot function |
| B-grade precision | ±0.5% VREF tolerance at 25°C reduces calibration overhead in precision ADC references and sensor biasing |
| Ultra-low IK(min) | 100 µA minimum cathode current allows use in standby/low-power modes without auxiliary bias sources |
| Stable without output capacitor | Internally compensated design eliminates need for cathode-to-anode capacitor - simplifies layout and improves reliability |
| Zener replacement capability | Sharp turn-on and <0.1 µA off-state current (IK(off)) provide lower leakage and tighter regulation than discrete Zeners |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
|
Use Scenario: Provides stable reference for 12–16-bit SAR and delta-sigma ADCs in industrial DAQ systems. IC Role / Device Role / Timing Role: Precision shunt reference generating VREF = 2.5 V or 4.096 V via resistor divider from 1.24 V base. Use Value: ±0.5% initial tolerance and <12 mV full-range drift ensure <0.01% INL contribution over temperature. |
Use Scenario: Regulates 3.3 V output in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and voltage reference in secondary-side feedback loop; compares scaled output to 1.24 V. Use Value: 100 µA IK(min) enables regulation at light loads; 0.25 Ω zKA maintains <1% output deviation across line/load. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Replaces 2.5 V or 3.3 V Zener diodes in on-board LDO pre-bias or bias supply circuits. IC Role / Device Role / Timing Role: Adjustable shunt regulator clamping voltage with programmable knee and low leakage. Use Value: 0.02 µA off-state current (IK(off)) reduces quiescent loss by >95% vs. standard Zeners; sharp turn-on improves accuracy. |
Use Scenario: Monitors 5 V or 12 V system rails for undervoltage lockout (UVLO) or fault detection. IC Role / Device Role / Timing Role: Comparator with integrated 1.24 V reference; triggers reset when divided rail drops below threshold. Use Value: Eliminates external reference IC; <0.5 µA Iref enables high-resistor-divider networks for minimal current draw. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431CLPR | 1.5% VREF tolerance at 25°C (standard grade), rated for 0°C to +70°C only | Suitable for commercial-grade non-critical biasing; not qualified for automotive or extended-temp industrial use | Select when cost sensitivity outweighs precision and temperature range requirements |
| TLVH431AILPR | 1% VREF tolerance at 25°C (A-grade), same –40°C to +125°C Q-grade thermal spec | Offers balanced accuracy and robustness for mid-tier power supply and sensing applications | Choose for designs requiring better-than-standard but lower-cost alternative to B-grade performance |
Compared with TLVH431ILPR, TLVH431CLPR sacrifices accuracy and temperature range for lower cost, while TLVH431AILPR provides 1% tolerance with identical thermal qualification - making it ideal for cost-constrained designs needing guaranteed operation up to +125°C without B-grade premium.
Availability
TLVH431ILPR is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and precision analog measurement systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLVH431ILPR 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 deep expertise in precision analog and power management ICs.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies, data converter references, and voltage supervision - addressing limitations of legacy TL431 in sub-3 V systems.
FAQ
What is the reference voltage tolerance of TLVH431ILPR at 25°C?
The TLVH431ILPR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with min/max values of 1.234 V and 1.246 V. This B-grade specification is confirmed in Section 5.7 of the TI SLVS555N datasheet and applies across all package variants including the TO-92 TLVH431ILPR.
Can TLVH431ILPR operate with cathode current below 1 mA?
Yes, TLVH431ILPR is specifically characterized to regulate stably with cathode current as low as 100 µA - significantly lower than the 1 mA minimum required by TL431. This enables use in ultra-low-power standby circuits and energy-harvesting applications where TLVH431ILPR remains functional while TL431 would drop out of regulation.
What package type does TLVH431ILPR use, and what are its pin assignments?
TLVH431ILPR uses the 3-pin TO-92 package (body size 4.30 mm × 4.30 mm). Pin 1 is CATHODE, Pin 2 is ANODE, and Pin 3 is REF - matching the pinout shown in Figure 4-3 of the TI datasheet. No NC or substrate connections are present in this variant.
How does TLVH431ILPR differ from TLVH432 in terms of functionality and pinout?
TLVH431ILPR and TLVH432 share identical electrical specifications and internal circuitry, but TLVH432 uses reversed pinout in SOT-23 and SOT-89 packages (REF/ANODE/CATHODE instead of CATHODE/ANODE/REF). TLVH431ILPR's TO-92 package has fixed CATHODE/ANODE/REF ordering and is not offered in TLVH432 pinout variants.
Is an output capacitor required for stability with TLVH431ILPR?
No, TLVH431ILPR is internally compensated and stable without an output capacitor between cathode and anode. Unlike many shunt regulators, it maintains phase margin across capacitive loads up to 10 nF (per Figures 5-15–5-17), eliminating mandatory external capacitance and reducing BOM count in space-constrained designs.
TLVH431ILPR 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:
- ±1.5%
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431ILPR FAQ
1.How can I place an order for TLVH431ILPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ILPR 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 TLVH431ILPR reliable?
The price and inventory of TLVH431ILPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ILPR is usually 5 days.
3.What payment methods are accepted for TLVH431ILPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ILPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ILPR?
TLVH431ILPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ILPR 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 TLVH431ILPR?
For technical support, including TLVH431ILPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ILPR requirements.
6.How does Aetrix verify that TLVH431ILPR is sourced from the original manufacturer or authorized distributors?
All TLVH431ILPR 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 TLVH431ILPR meets industry standards.
7.What is the process for return or replacement of TLVH431ILPR?
All TLVH431ILPR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ILPR, 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 TLVH431ILPR part is unused and in its original packaging.
Return procedure for TLVH431ILPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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