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Texas Instruments TLV431ILPE3
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- Part No.:
- TLV431ILPE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TLV431ILPE3.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,969
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Product details
Overview
TLV431ILPE3 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±1.5% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, 80 µA typical minimum cathode current, and operation from 1.24 V to 6 V output range. It serves as a Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLV431ILPE3 datasheet, TLV431ILPE3 pinout, TLV431ILPE3 application, or TLV431ILPE3 equivalent, key selection criteria include reference accuracy over temperature (±11 mV from –40°C to 125°C), ultra-low cathode current requirement, SC-70 package footprint, and compatibility with optocoupler-based secondary-side regulation in 3.3 V systems.
Technical Context
The TLV431ILPE3 implements a bandgap-referenced error amplifier driving a Darlington sink output stage, enabling precise closed-loop shunt regulation or open-loop comparator operation with integrated 1.24 V reference. Its internal compensation ensures stability without external capacitors across cathode–anode.
It operates in two functional modes: open-loop (comparator with built-in reference) requiring ≥80 µA cathode current for full gain, and closed-loop (shunt regulator) where feedback from cathode to reference sets output voltage via resistor divider. The device maintains regulation down to 1.24 V cathode–anode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V nominal; ±1.5% tolerance at 25°C defines initial setpoint accuracy for adjustable regulation |
| Output Voltage Range | 1.24 V to 6 V; set externally via resistor divider on REF pin - enables low-voltage rail monitoring and regulation |
| Dynamic Impedance | 0.25 Ω typical; ensures tight regulation under load transients and minimal output voltage droop |
| Min Cathode Current (IK(min)) | 80 µA typical; allows operation in ultra-low-power applications where TL431 (1 mA) would fail |
| Temp Drift (–40°C to 125°C) | ±11 mV; specifies worst-case reference deviation across automotive-grade temperature range |
| ESD Rating (HBM) | ±2000 V; meets standard handling requirements for board assembly without special ESD controls |
| Package | SC-70 (DCK); 2.0 mm × 1.5 mm footprint - 40% smaller than SOT-23-3, suitable for space-constrained PCBs |
Pinout & Package
TLV431ILPE3 is housed in an ultra-small SC-70 (DCK) package with 6 pins. Pin 1 is CATHODE (shunt current input), Pin 3 is REF (reference threshold input), and Pin 6 is ANODE (common ground return). Pins 2, 4, and 5 are NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current sink input | Primary current path; connects to regulated node or optocoupler LED anode in feedback loops |
| 3 (REF) | Reference threshold input | Senses divided output voltage; must be biased with ≥0.15 µA to maintain regulation |
| 6 (ANODE) | Common return terminal | Typically tied to system ground; forms reference point for VKA and IK measurements |
| 2, 4, 5 (NC) | No internal connection | Unbonded; must remain unconnected or floating - no routing or stitching required |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where TL431 (2.5 V) cannot function |
| Adjustable output range | 1.24 V to 6 V via two-resistor divider - supports wide range of supply and monitoring voltages without discrete Zeners |
| Ultra-low cathode current | 80 µA typical minimum ensures stable regulation in battery-powered or standby circuits with microamp-level bias budgets |
| Sharp turn-on characteristic | Active output stage provides fast response and clean switching - ideal for voltage monitoring and overvoltage detection |
| SC-70 packaging | 2.0 mm × 1.5 mm footprint reduces PCB area by 40% vs SOT-23-3 - critical for compact power modules and portable devices |
Applications
| Isolated Flyback Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier - compares divided output voltage against internal 1.24 V reference and drives optocoupler LED current. Use Value: Enables regulation down to ~2.7 V output (1.24 V + opto LED VF), supporting modern low-voltage rails with tighter tolerances than fixed Zeners. |
Use Scenario: On-board voltage reference and clamping in low-power microcontroller peripherals. IC Role / Device Role / Timing Role: Precision shunt reference - replaces discrete 1.24 V Zener diodes with superior temperature stability and lower dynamic impedance. Use Value: Reduces reference drift from >20 mV/°C (Zener) to ±11 mV over –40°C to 125°C, improving ADC accuracy and brownout detection reliability. |
| Voltage Monitoring | Comparator with Integrated Reference |
|
Use Scenario: System-level undervoltage lockout (UVLO) and overvoltage protection in industrial sensors. IC Role / Device Role / Timing Role: Adjustable threshold detector - REF pin biased to trip point; CATHODE pulled high when condition violated. Use Value: Eliminates need for external reference IC + comparator; single-device solution with 1.24 V base threshold scalable to any voltage via resistors. |
Use Scenario: Logic-level signal conditioning for analog sensor outputs feeding digital inputs. IC Role / Device Role / Timing Role: Open-loop comparator - uses internal reference to compare analog input against programmable threshold. Use Value: Provides rail-to-rail output swing (cathode open-collector) and <1 µs response with only 80 µA supply - ideal for low-power wake-up circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | 1% initial tolerance (vs 1.5%), same SC-70 package, identical pinout and electrical specs except tighter VREF spec | Better accuracy needed in precision feedback loops (e.g., telecom power supplies), but higher cost | Select TLV431ACDBVR when ±1% reference accuracy is required at 25°C; otherwise TLV431ILPE3 suffices for general-purpose regulation |
| TLVH431IDBVR | Wider VKA range (1.24 V to 18 V), higher IK (80 mA), SOT-23-3 package - not pin-compatible | Required for >6 V regulation or higher-current shunt applications; incompatible PCB layout | Choose TLVH431IDBVR only when output exceeds 6 V or cathode current >15 mA is needed; TLV431ILPE3 remains optimal for ≤6 V, low-IK use cases |
Compared with TLV431ACDBVR, TLV431ILPE3 trades 0.5% initial accuracy for lower cost and broader qualification across commercial temperature ranges; compared with TLVH431IDBVR, it offers smaller SC-70 size and lower quiescent current but sacrifices voltage headroom and current capability.
Availability
TLV431ILPE3 is available at Aetrix Electronics and suitable for isolated flyback SMPS design, voltage monitoring circuits, and low-power Zener replacement applications requiring stable component supply and long-term manufacturability.
Supply support for TLV431ILPE3 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TLV431 family was designed specifically for low-voltage, low-power shunt regulation and precision voltage referencing - targeting space- and energy-constrained applications where legacy TL431 devices cannot operate.
FAQ
What is the reference voltage tolerance of TLV431ILPE3 at 25°C?
The TLV431ILPE3 has a reference voltage tolerance of ±1.5% at 25°C, corresponding to a VREF range of 1.222 V to 1.258 V. This is specified in the TLV431 (unmarked grade) variant per TI's SLVS139Z datasheet Section 5.5. The 'I' suffix denotes –40°C to 85°C operating range, and 'LPE3' indicates SC-70 (DCK) packaging with lead-free finish.
Can TLV431ILPE3 replace a standard Zener diode in a 3.3 V regulator circuit?
Yes, TLV431ILPE3 can directly replace low-voltage Zener diodes in 3.3 V regulator circuits. Its 1.24 V reference, 0.25 Ω dynamic impedance, and 80 µA minimum cathode current provide superior regulation accuracy and thermal stability versus discrete Zeners. External resistors set the output voltage, and its sharp turn-on characteristic improves transient response in shunt configurations.
What is the maximum cathode voltage (VKA) rating for TLV431ILPE3?
The absolute maximum cathode-to-anode voltage (VKA) for TLV431ILPE3 is 7 V, as stated in Section 5.1 of the TI datasheet. For reliable operation, the recommended maximum is 6 V per Section 5.3. Exceeding 7 V risks permanent damage; operation between 6 V and 7 V is outside recommended conditions and may degrade long-term reliability.
Does TLV431ILPE3 require an output capacitor for stability?
No, TLV431ILPE3 is internally compensated and does not require an output capacitor between cathode and anode for basic shunt regulator stability. However, if a capacitive load is present (e.g., optocoupler CTR variation or PCB trace capacitance), Figure 5-19 in the datasheet provides phase margin vs capacitive load guidance to avoid oscillation - especially above 1 nF.
What are the thermal characteristics of TLV431ILPE3 in its SC-70 package?
In the SC-70 (DCK) package, TLV431ILPE3 has a junction-to-ambient thermal resistance (RθJA) of 87°C/W and junction-to-case (top) resistance (RθJC(top)) of 259°C/W, per Section 5.4 of the datasheet. These values assume standard JEDEC 2-layer board conditions; actual thermal performance depends on PCB copper area, airflow, and adjacent heat sources.
TLV431ILPE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 6 V
- Current - Output:
- 15 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLV431ILPE3 FAQ
1.How can I place an order for TLV431ILPE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431ILPE3 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 TLV431ILPE3 reliable?
The price and inventory of TLV431ILPE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431ILPE3 is usually 5 days.
3.What payment methods are accepted for TLV431ILPE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431ILPE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431ILPE3?
TLV431ILPE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431ILPE3 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 TLV431ILPE3?
For technical support, including TLV431ILPE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431ILPE3 requirements.
6.How does Aetrix verify that TLV431ILPE3 is sourced from the original manufacturer or authorized distributors?
All TLV431ILPE3 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 TLV431ILPE3 meets industry standards.
7.What is the process for return or replacement of TLV431ILPE3?
All TLV431ILPE3 units undergo pre-shipment inspection (PSI). If there is an issue with TLV431ILPE3, 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 TLV431ILPE3 part is unused and in its original packaging.
Return procedure for TLV431ILPE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431ILPE3 Tags
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