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Texas Instruments TLVH431ILPRE3
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- Part No.:
- TLVH431ILPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431ILPRE3.pdf
- Description:
- IC VREF SHUNT PREC ADJ TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TLVH431ILPRE3 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 delivers 0.25 Ω typical dynamic impedance and supports output voltages from 1.24 V to 18 V via external resistors-enabling secondary-side regulation in 3.3 V isolated flyback SMPSs.
For engineers reviewing the TLVH431ILPRE3 datasheet, TLVH431ILPRE3 pinout, TLVH431ILPRE3 application, or TLVH431ILPRE3 equivalent, key selection criteria include its 1.24 V low-voltage reference, ultra-low 100 µA minimum cathode current for energy-efficient regulation, SC-70 package footprint, and compatibility with optocoupler-based feedback loops in compact power supplies.
Technical Context
The TLVH431ILPRE3 integrates a precision 1.24 V bandgap reference and high-gain error amplifier driving a Darlington sink output stage. Its open-loop comparator mode enables voltage monitoring without external reference; closed-loop operation with resistive feedback achieves stable shunt regulation across –40°C to +125°C.
Unlike the TL431, it operates at lower headroom (≥1.24 V) and draws significantly less reference current (≤0.5 µA), enabling use in battery-powered and low-power systems. Internal compensation ensures stability without an output capacitor, though phase margin vs. capacitive load is characterized up to 100 nF.
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 such as standby rails |
| Dynamic Impedance (|zKA|) | 0.25 Ω typical - ensures tight output voltage stability 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 regulation using two external resistors |
| Reference Input Current (Iref) | 0.1–0.5 µA - minimizes resistor-divider loading error and power loss |
| Output Noise (0.1–10 Hz) | 10 µVPP - suitable for precision data converter references and low-drift monitoring |
Pinout & Package
TLVH431ILPRE3 is packaged in a 6-pin SC-70 (DCK) with 2.00 mm × 1.25 mm body size and pin 1 marked by a dot. The package includes no internal connection on pins 4 and 5; pin 2 connects to substrate and must be tied to ANODE or left floating per design requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input/output | Sinks regulated current; voltage at this node defines output regulation point when used in closed loop |
| ANODE (Pin 2) | Common return path | Typically connected to system ground or low-side rail; substrate tie point requires explicit routing |
| REF (Pin 3) | Reference input | Compares external voltage to internal 1.24 V reference; requires ≥0.1 µA bias current |
| NC (Pins 4, 5) | No internal connection | Must remain unconnected; no electrical function or thermal benefit |
| Substrate (Pin 2) | Mechanical/thermal interface | Electrically tied to ANODE internally; must be connected to ANODE net or left open per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage reference | 1.24 V operation enables regulation below 2.5 V-critical for modern 1.8 V/3.3 V systems |
| B-grade precision | ±0.5% VREF tolerance at 25°C reduces calibration overhead in factory programming |
| Ultra-low IK(min) | 100 µA minimum cathode current allows use in micropower designs where TL431 fails |
| Internal compensation | Stable without output capacitor-simplifies layout and eliminates ESR sensitivity in space-constrained PCBs |
| Wide temperature range | –40°C to +125°C operation supports under-hood automotive and industrial control applications |
Applications
| Adjustable Data Converter Reference | Isolated Flyback Secondary Regulation |
|---|---|
Use Scenario: Providing stable, user-adjustable reference voltage for SAR and delta-sigma ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference generating VREF = 1.24 V × (1 + R1/R2) with <10 ppm/°C drift over temperature. Use Value: Eliminates need for discrete Zener + op-amp buffer; 0.25 Ω impedance maintains reference accuracy under varying ADC input capacitance. | Use Scenario: Regulating 3.3 V output in optocoupler-coupled flyback converters for USB-C PD adapters and IoT gateways. IC Role / Device Role / Timing Role: Error amplifier and voltage reference in isolated feedback path-comparing sampled output to internal 1.24 V reference. Use Value: Enables 2.7 V minimum regulated output (1.24 V + opto LED drop); 100 µA IK(min) supports light-load efficiency compliance. |
| Zener Diode Replacement | Power Rail Voltage Monitor |
Use Scenario: Replacing 2.4 V–3.6 V Zener diodes in LDO bias networks and microcontroller reset circuits. IC Role / Device Role / Timing Role: Low-leakage (0.02 µA off-state) shunt element providing sharp turn-on and predictable knee voltage. Use Value: Reduces leakage current by >90% versus standard Zeners-extending battery life in always-on sensor nodes. | Use Scenario: Monitoring 5 V or 12 V supply rails for brownout detection in PLC I/O modules and motor drives. IC Role / Device Role / Timing Role: Comparator with integrated 1.24 V reference-triggering fault signals when VIN × R2/(R1+R2) falls below threshold. Use Value: Single-component solution avoids external reference IC; ±0.5% tolerance ensures accurate trip-point repeatability across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACLP | TO-92 package, 1% initial tolerance (A-grade), higher thermal resistance (140 °C/W) | Better suited for through-hole prototyping and low-volume industrial controls with manual assembly | Choose when lead-free through-hole mounting and moderate precision suffice; not for space-constrained SMT designs |
| TLVH432ILP | Identical electrical specs but SOT-89-3 pinout (CATHODE–REF–ANODE), same B-grade tolerance | Enables direct replacement in existing SOT-89 layouts without PCB revision-no pin rework needed | Select when migrating from TLVH432 or requiring SOT-89 thermal performance (52 °C/W RθJA) |
Compared with TLVH431ILPRE3, TLVH431ACLP offers easier hand-soldering but sacrifices board area and thermal performance, while TLVH432ILP provides identical regulation accuracy in a thermally superior SOT-89 package with different pin sequence-requiring layout verification but no functional redesign.
Availability
TLVH431ILPRE3 is available at Aetrix Electronics and suitable for isolated power supplies, precision analog references, and voltage monitoring circuits requiring stable component supply across automotive, industrial, and embedded computing programs.
Supply support for TLVH431ILPRE3 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 family was designed specifically for low-voltage, low-power shunt regulation-replacing Zeners and legacy TL431s in space- and energy-constrained applications like isolated DC/DC converters and portable instrumentation.
FAQ
What is the reference voltage tolerance of TLVH431ILPRE3 at 25°C?
The TLVH431ILPRE3 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to the 'B' grade designation in its part number. This means its VREF is guaranteed between 1.234 V and 1.246 V under nominal conditions, enabling high-accuracy regulation without post-manufacturing trimming.
Can TLVH431ILPRE3 operate with cathode currents below 100 µA?
No-TLVH431ILPRE3 requires a minimum cathode current of 100 µA to maintain regulation. Below this threshold, gain drops significantly and the device exits linear operation. Datasheet Figure 5-5 confirms IK(min) rises to 120 µA at 125°C, so designs must ensure ≥150 µA margin for full temperature range reliability.
How does the SC-70 package of TLVH431ILPRE3 compare to SOT-23 variants?
The TLVH431ILPRE3 uses a 6-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm-40% smaller than standard 3-pin SOT-23-3. While pin count differs, its electrical behavior matches other TLVH431B variants; however, pin 2 serves as substrate connection and must be routed to ANODE, unlike SOT-23-3 DBZ variants.
Is TLVH431ILPRE3 suitable for use in automotive applications?
Yes-TLVH431ILPRE3 is rated for operation from –40°C to +125°C and belongs to the Q-temperature grade family. Its qualification per AEC-Q100 is not stated in the public datasheet, but its extended temperature range, low drift (≤31 mV VREF deviation), and robust ESD rating (±2000 V HBM) support under-hood and infotainment power rail monitoring.
Does TLVH431ILPRE3 require an output capacitor for stability?
No-TLVH431ILPRE3 is internally compensated and stable without an output capacitor between CATHODE and ANODE. However, if a capacitor is added for noise filtering, Figures 5-15 to 5-17 in the datasheet provide phase-margin guidance up to 100 nF; exceeding this may induce oscillation depending on load conditions.
TLVH431ILPRE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Bulk
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431ILPRE3 FAQ
1.How can I place an order for TLVH431ILPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ILPRE3 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 TLVH431ILPRE3 reliable?
The price and inventory of TLVH431ILPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ILPRE3 is usually 5 days.
3.What payment methods are accepted for TLVH431ILPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ILPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ILPRE3?
TLVH431ILPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ILPRE3 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 TLVH431ILPRE3?
For technical support, including TLVH431ILPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ILPRE3 requirements.
6.How does Aetrix verify that TLVH431ILPRE3 is sourced from the original manufacturer or authorized distributors?
All TLVH431ILPRE3 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 TLVH431ILPRE3 meets industry standards.
7.What is the process for return or replacement of TLVH431ILPRE3?
All TLVH431ILPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ILPRE3, 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 TLVH431ILPRE3 part is unused and in its original packaging.
Return procedure for TLVH431ILPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ILPRE3 Tags
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TL431AIDBZR
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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