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Diodes Incorporated TLV431BE5TA
- Part No.:
- TLV431BE5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV431BE5TA.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:6,292
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Product details
Overview
TLV431BE5TA from Diodes Incorporated is a precision 1.24V adjustable shunt voltage regulator in SOT25 package, rated for ±0.5% initial reference voltage tolerance at +25°C, −40°C to +125°C operating temperature, 20mA max cathode current, and 0.25Ω typical dynamic output impedance. It replaces Zener diodes in isolated DC-DC feedback loops, battery voltage monitors, and low-power LDO enhancement circuits.
For engineers reviewing the TLV431BE5TA datasheet, TLV431BE5TA pinout, TLV431BE5TA application, or TLV431BE5TA equivalent, key selection criteria include reference accuracy over temperature, minimum cathode current (55–100µA), dynamic impedance, cathode voltage range (1.24V–18V), and SOT25 thermal performance (250°C/W θJA, 500mW PDIS).
Technical Context
The TLV431BE5TA operates as a 3-terminal programmable shunt regulator: cathode sinks current to maintain VREF = 1.24V across the external resistor divider connected to the REF pin. Its internal bandgap reference and error amplifier enable stable regulation with <11mV total VREF drift over −40°C to +125°C.
It functions in closed-loop feedback topologies-especially optocoupler-coupled isolated flyback supplies-where it drives LED current based on output voltage deviation, enabling secondary-side regulation without primary-side sensing. The SOT25 package features die attachment between pins 2 and 5, requiring pin 2 to be floating or tied to pin 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.24V nominal; ±0.5% tolerance at +25°C ensures tight output voltage setting in precision feedback networks |
| VKA Range | 1.24V to 18V; enables adjustable regulation from near-reference up to industrial supply rails |
| IK(min) | 55–100µA over −40°C to +125°C; defines minimum shunt current needed to sustain regulation under worst-case thermal conditions |
| ZKA | 0.25Ω typical; low dynamic output impedance minimizes output voltage variation under load transients |
| θJA | 250°C/W (SOT25); supports 500mW maximum power dissipation at TA = +25°C, critical for thermal design in compact layouts |
| TJ Range | −40°C to +150°C; junction rating allows reliable operation in automotive under-hood and industrial control environments |
| IK Max | ±20mA absolute max; sets upper limit for shunt current handling in overvoltage protection and current-sink applications |
Pinout & Package
SOT25 (5-pin SC-74A) package with exposed thermal pad (pin 5). Die attached to pins 2 and 5 - pin 2 must be left floating or connected to pin 5. Pin 3 is no-connect (NC) and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Main current sink terminal; connects to supply rail or optocoupler anode; handles full shunt current up to 20mA |
| 2 | Anode | Reference ground return; electrically tied to pin 5 in SOT25; must float or connect to pin 5 per layout guidelines |
| 3 | NC | No internal connection; must remain unconnected to avoid parasitic coupling or latch-up risk |
| 4 | REF | Feedback input; senses divided output voltage; draws only 0.15–0.5µA, enabling high-resistor-divider designs |
| 5 | Anode / Thermal Pad | Common anode node and thermal path; soldered to PCB copper for enhanced heat dissipation and electrical grounding |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable regulation range | 1.24V to 18V via two external resistors - eliminates need for multiple Zener voltages in BOM |
| Low IREF | 0.15–0.5µA typical - enables >10MΩ feedback dividers, reducing quiescent current in battery-powered systems |
| High temp stability | 11mV VREF drift over −40°C to +125°C - maintains accuracy in automotive and industrial ambient extremes |
| Low ZKA | 0.25Ω typical - delivers <1mV output perturbation per 1mA load step, critical for noise-sensitive analog supplies |
| RoHS/Green compliance | Fully lead-free, halogen- and antimony-free - meets IPC-1752A material declaration and automotive ELV requirements |
Applications
| Isolated Flyback PSU Feedback | Battery Voltage Monitor |
|---|---|
|
Use Scenario: Secondary-side regulation in 5–24V isolated DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt regulator controlling optocoupler LED current to close voltage feedback loop across isolation barrier. Use Value: Enables ±1% output accuracy without primary-side sensing; supports output voltages as low as 2.7V with 1.4V opto VF. |
Use Scenario: Precision low-power monitoring of Li-ion, lead-acid, or multi-cell battery packs. IC Role / Device Role / Timing Role: Adjustable shunt reference comparing battery voltage against scaled threshold via resistor divider. Use Value: 0.5% VREF tolerance and <100µA IK(min) allow accurate undervoltage lockout at µA-level system standby current. |
| LDO Output Accuracy Enhancer | Overvoltage Protection Clamp |
|
Use Scenario: Improving output voltage accuracy and adjustability of fixed-output linear regulators (e.g., AP1084, AP1117). IC Role / Device Role / Timing Role: Programmable reference replacing regulator's internal feedback node to set precise output voltage. Use Value: Transfers TLV431's 0.5% reference accuracy to entire LDO output while retaining original IC's current limit and thermal shutdown. |
Use Scenario: Protecting downstream circuitry from transient overvoltage events on 3.3V/5V/12V rails. IC Role / Device Role / Timing Role: Fast-acting shunt clamp activated when rail exceeds programmed threshold via resistor divider. Use Value: 20mA cathode current capability and 0.25Ω ZKA enable rapid clamping with minimal overshoot during ESD or surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BFTA (SOT23) | Same 0.5% VREF tolerance and electrical specs; smaller 3-pin SOT23 package, higher θJA (380°C/W), lower PDIS (330mW) | Preferred where board space is constrained and power dissipation ≤330mW; unsuitable for >330mW thermal loads | Select when footprint reduction outweighs thermal derating needs; verify layout thermal relief for sustained 15mA operation |
| TLVH431BIDBVR (TI) | 0.5% VREF, wider VKA range (2.5V–36V), higher IK(max) (100mA), but larger SOT23-6 package and 1.25V VREF | Used in higher-voltage industrial supplies (>18V) or where >20mA shunt current is required | Choose only if VKA >18V or IK >20mA is mandatory; not drop-in due to different pinout and reference offset |
Compared with TLV431BE5TA, the SOT23 variant trades thermal capability for size, while the TI TLVH431 offers extended voltage/current range at the cost of pin compatibility and reference voltage shift-making TLV431BE5TA optimal for thermally demanding, space-constrained 1.24–18V shunt regulation.
Availability
TLV431BE5TA is available at Aetrix Electronics and suitable for isolated power supply feedback, battery management systems, LDO accuracy enhancement, and overvoltage protection circuits requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for TLV431BE5TA 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices, with emphasis on high-reliability, energy-efficient solutions for industrial, automotive, and computing markets.
The TLV431 series belongs to Diodes' precision reference and voltage regulation product line, engineered specifically for cost-sensitive, high-accuracy shunt regulation in isolated and low-power applications where Zener diodes fall short in stability and drive capability.
FAQ
What is the minimum cathode current required for regulation across temperature?
The TLV431BE5TA requires 55µA minimum cathode current (IK(min)) to maintain regulation at temperatures from 0°C to +70°C and −40°C to +85°C, rising to 100µA at −40°C to +125°C. This value is specified in the Electrical Characteristics table under "IKMIN" and must be met by the external series resistor network under worst-case supply and load conditions.
Can pin 2 and pin 5 of the SOT25 package be used independently?
No. In the SOT25 package, the die is physically attached to both pin 2 (Anode) and pin 5 (Thermal Pad/Anode), creating an internal electrical short. Therefore, pin 2 must either be left floating or explicitly connected to pin 5 - independent routing or biasing of pin 2 violates the device's mechanical construction and may cause malfunction or reliability failure.
How does the TLV431BE5TA differ from the TLV431AE5TA?
The TLV431BE5TA has ±0.5% reference voltage tolerance at +25°C versus ±1% for the TLV431AE5TA. Both share identical SOT25 packaging, temperature range (−40°C to +125°C), electrical architecture, and pinout. The tighter tolerance directly improves output voltage accuracy in feedback and monitoring applications without changing circuit design or layout.
Is the TLV431BE5TA suitable for automotive applications?
The standard TLV431BE5TA is not AEC-Q200 qualified. Diodes offers the automotive-grade TLV431Q variant (separate datasheet) with extended qualification, enhanced testing, and guaranteed PPAP support. For non-safety-critical automotive subsystems where qualification is not mandated, TLV431BE5TA may be used-but design validation must confirm robustness under automotive thermal, vibration, and ESD stress profiles.
TLV431BE5TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
TLV431BE5TA FAQ
1.How can I place an order for TLV431BE5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BE5TA 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 TLV431BE5TA reliable?
The price and inventory of TLV431BE5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BE5TA is usually 5 days.
3.What payment methods are accepted for TLV431BE5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431BE5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431BE5TA?
TLV431BE5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BE5TA 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 TLV431BE5TA?
For technical support, including TLV431BE5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BE5TA requirements.
6.How does Aetrix verify that TLV431BE5TA is sourced from the original manufacturer or authorized distributors?
All TLV431BE5TA 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 TLV431BE5TA meets industry standards.
7.What is the process for return or replacement of TLV431BE5TA?
All TLV431BE5TA units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BE5TA, 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 TLV431BE5TA part is unused and in its original packaging.
Return procedure for TLV431BE5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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