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Texas Instruments TLVH431CLPRE3
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- Part No.:
- TLVH431CLPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431CLPRE3.pdf
- Description:
- IC VREF SHUNT PREC ADJ TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TLVH431CLPRE3 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±1.5% initial tolerance at 25°C, and operation down to 100 µA cathode current. It delivers 0.25 Ω typical dynamic impedance and supports output voltage adjustment from 1.24 V to 18 V using two external resistors - enabling use in isolated flyback SMPS feedback loops and low-voltage Zener replacement applications.
For engineers reviewing the TLVH431CLPRE3 datasheet, TLVH431CLPRE3 pinout, TLVH431CLPRE3 application, or TLVH431CLPRE3 equivalent, key selection criteria include its 1.24 V minimum operating voltage, –40°C to +125°C extended temperature range (Q-grade), SC-70-6 package footprint, and compatibility with optocoupler-based secondary-side regulation in 3.3 V power supplies.
Technical Context
The TLVH431CLPRE3 implements a bandgap-referenced error amplifier with Darlington output stage, delivering sharp turn-on characteristics and stable closed-loop regulation without mandatory output capacitance. Its internal 1.24 V reference is trimmed for ±1.5% accuracy at 25°C and exhibits ≤31 mV deviation over –40°C to +125°C.
Operating as either an open-loop comparator (with integrated reference) or closed-loop shunt regulator, it accepts cathode voltages from VREF to 18 V and sinks cathode current from 100 µA to 70 mA. Reference terminal current remains below 0.5 µA across temperature, minimizing resistor-divider loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V nominal; ±1.5% tolerance at 25°C ensures predictable setpoint for adjustable regulators and comparators |
| Output Voltage Range | 1.24 V to 18 V; set via external R1/R2 divider - enables direct replacement of discrete Zener diodes up to 18 V |
| Cathode Current Range | 100 µA to 70 mA; ultra-low 100 µA minimum enables regulation in battery-powered or standby circuits |
| Dynamic Impedance | 0.25 Ω typical; provides tight load regulation and low output noise in feedback paths |
| Temperature Range | –40°C to +125°C; qualified for automotive and industrial environments requiring Q-grade reliability |
| Reference Input Current | ≤0.5 µA max; minimizes voltage drop and error in high-impedance feedback dividers |
| Output Capacitor Stability | Internally compensated; operates stably without output capacitor - simplifies layout in space-constrained designs |
Pinout & Package
TLVH431CLPRE3 is packaged in a 6-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, offering 40% smaller footprint than SOT-23-3. The package includes exposed substrate connection (Pin 2) that must be tied to ANODE or left floating per design requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary current path; connects to regulated rail or optocoupler LED anode in isolated feedback |
| NC (Pin 2) | No internal connection | Substrate tie point; must connect to ANODE or remain unconnected - not used as signal |
| ANODE (Pin 3) | Common return / ground reference | Typically connected to system ground or power supply return; defines reference potential for VREF |
| NC (Pin 4) | No internal connection | Unused pad; no electrical function - may be left unconnected or grounded for thermal relief |
| REF (Pin 5) | Feedback input / threshold sense | Compares external voltage to internal 1.24 V reference; requires ≥0.1 µA bias current for proper operation |
| NC (Pin 6) | No internal connection | Unused pad; electrically isolated - no routing or soldering required |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-to-anode voltage - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot operate |
| Ultra-low cathode current | 100 µA minimum regulation current - reduces standby power in always-on monitoring and isolated feedback circuits |
| Integrated reference + amplifier | Single-device comparator functionality eliminates need for external voltage reference and op-amp in level-detection applications |
| Stable without output capacitor | Internal compensation avoids stability risks from PCB parasitics - ideal for compact DC/DC modules and embedded power rails |
| High-temperature grade | Qualified for –40°C to +125°C operation - supports under-hood automotive, industrial motor drives, and telecom infrastructure |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary Side Regulation in Flyback SMPSs |
|---|---|
|
Use Scenario: Precision ADC/DAC reference in battery-powered sensor nodes and portable instrumentation. IC Role / Device Role / Timing Role: Adjustable shunt reference providing stable 1.24–5.0 V reference voltage for SAR and delta-sigma converters. Use Value: ±1.5% initial tolerance and <31 mV tempco ensure <0.01% full-scale error drift over –40°C to +125°C. |
Use Scenario: Isolated voltage feedback in 3.3 V/5 V offline flyback converters for industrial PLCs and IoT gateways. IC Role / Device Role / Timing Role: Error amplifier and reference in optocoupler-coupled secondary-side regulation loop. Use Value: 100 µA min cathode current allows regulation at light loads; 0.25 Ω impedance improves transient response vs. Zener diodes. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Low-leakage, temperature-stable voltage clamp on FPGA I/O banks and microcontroller supply rails. IC Role / Device Role / Timing Role: Precision shunt regulator replacing 2.4–12 V Zener diodes with superior accuracy and thermal stability. Use Value: IK(off) ≤0.1 µA at 18 V and <0.5 µA IREF minimize quiescent current - critical for energy harvesting and ultra-low-power designs. |
Use Scenario: Undervoltage lockout (UVLO) and brownout detection in automotive body control modules and server VRMs. IC Role / Device Role / Timing Role: Comparator with built-in 1.24 V reference monitoring 1.8 V, 3.3 V, or 5 V rails. Use Value: Open-loop gain >100 dB enables fast, clean switching; REF pin bias <0.5 µA avoids loading sensitive rail-sense dividers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AILP | TO-92-3 package; 4.3 mm × 4.3 mm body; 140 °C/W θJA; ±1% VREF tolerance | Better thermal performance in through-hole prototyping; lower reference tolerance but larger footprint | Select when manual assembly, high-reliability through-hole mounting, or tighter 1% initial accuracy is required |
| TLVH431BQDBVR | SOT-23-5 package; 2.9 mm × 1.6 mm; ±0.5% VREF tolerance; same Q-grade temperature range | Higher accuracy variant in industry-standard SOT-23; pin-compatible with TLVH431CLPRE3 only in functional role, not physical layout | Select when 0.5% reference accuracy is mandatory and board space permits SOT-23-5 instead of SC-70-6 |
Compared with TLVH431CLPRE3, TLVH431AILP offers easier hand-soldering and better thermal dissipation in low-volume builds, while TLVH431BQDBVR delivers higher initial accuracy in a more widely supported package - neither is pin-compatible, but both support identical circuit topologies and operating conditions.
Availability
TLVH431CLPRE3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical sensor interfaces requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for TLVH431CLPRE3 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 ICs, with decades of expertise in precision reference and power control solutions.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated and non-isolated power supplies, data converters, and voltage-monitoring systems - targeting applications where TL431's 2.5 V reference and 1 mA minimum current are limiting.
FAQ
What is the reference voltage tolerance of TLVH431CLPRE3 at 25°C?
The TLVH431CLPRE3 has a standard-grade reference voltage tolerance of ±1.5% at 25°C, corresponding to a 1.24 V nominal VREF with a range of 1.222 V to 1.258 V. This tolerance is specified in Section 5.5 of the TI SLVS555N datasheet and applies across all operating conditions at room temperature.
Can TLVH431CLPRE3 operate with cathode current below 100 µA?
No - TLVH431CLPRE3 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 device may still conduct, but performance is not guaranteed per datasheet specifications.
What is the maximum cathode voltage rating for TLVH431CLPRE3?
The absolute maximum cathode-to-anode voltage (VKA) for TLVH431CLPRE3 is 20 V, as stated in Section 5.1 of the datasheet. For reliable continuous operation, the recommended maximum is 18 V per Section 5.3 - exceeding this risks parametric shift or long-term reliability degradation.
Does TLVH431CLPRE3 require an output capacitor for stability?
No - TLVH431CLPRE3 is internally compensated and stable without an output capacitor between CATHODE and ANODE. This eliminates capacitor-related instability risks in compact layouts. However, if an output capacitor is added for filtering, Figures 5-15 to 5-17 in the datasheet provide phase-margin guidance for selecting appropriate values.
How does the SC-70-6 package of TLVH431CLPRE3 differ from SOT-23 variants?
The TLVH431CLPRE3 uses a 6-pin SC-70 package (DCK) measuring 2.00 mm × 1.25 mm - 40% smaller than SOT-23-3. It features two NC pins (Pins 2 and 4) and one substrate tie (Pin 2), whereas SOT-23-3 variants have only three active pins. Pin mapping differs: CATHODE/REF/ANODE are on Pins 1/5/3 in DCK, versus 1/3/2 in DBZ.
TLVH431CLPRE3 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
TLVH431CLPRE3 FAQ
1.How can I place an order for TLVH431CLPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431CLPRE3 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 TLVH431CLPRE3 reliable?
The price and inventory of TLVH431CLPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431CLPRE3 is usually 5 days.
3.What payment methods are accepted for TLVH431CLPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431CLPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431CLPRE3?
TLVH431CLPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431CLPRE3 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 TLVH431CLPRE3?
For technical support, including TLVH431CLPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431CLPRE3 requirements.
6.How does Aetrix verify that TLVH431CLPRE3 is sourced from the original manufacturer or authorized distributors?
All TLVH431CLPRE3 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 TLVH431CLPRE3 meets industry standards.
7.What is the process for return or replacement of TLVH431CLPRE3?
All TLVH431CLPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431CLPRE3, 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 TLVH431CLPRE3 part is unused and in its original packaging.
Return procedure for TLVH431CLPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431CLPRE3 Tags
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