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Diodes Incorporated TLV431AE5TA
- Part No.:
- TLV431AE5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV431AE5TA.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:90,585
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Product details
Overview
TLV431AE5TA from Diodes Incorporated is a 1.24V adjustable precision shunt voltage regulator in SOT25 package, rated for ±1% initial reference voltage tolerance at +25°C, -40°C to +125°C operating temperature, and 20mA max cathode current. It replaces Zener diodes in feedback loops of isolated DC-DC converters, linear regulators, and voltage monitoring circuits where stable 1.24–18V programmable reference is required.
For engineers reviewing the TLV431AE5TA datasheet, TLV431AE5TA pinout, TLV431AE5TA application, or TLV431AE5TA equivalent, this device serves as a low-voltage, high-accuracy shunt reference with 0.25Ω typical output impedance, 80µA minimum cathode current, and compatibility with optocoupler-based feedback in flyback and forward converters.
Technical Context
The TLV431AE5TA operates as a 3-terminal shunt regulator: cathode sinks current to maintain VREF = 1.24V across the reference pin relative to anode. Its internal bandgap reference and error amplifier enable precise regulation over wide temperature and load conditions without external compensation.
It functions within a cathode-to-anode voltage range of 1.24V to 18V, supports continuous cathode current from –20mA to +20mA, and exhibits 11mV total reference deviation across –40°C to +125°C - enabling use in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.24V nominal, ±1% tolerance at +25°C - sets precise regulation point for external resistor divider |
| VK A Range | 1.24V to 18V - enables programmable output voltages up to 18V using R1/R2 feedback network |
| IK(min) | 80µA max at –40°C to +125°C - defines minimum shunt current needed to sustain regulation |
| ZK A | 0.25Ω typical - ensures low dynamic output impedance for stable loop response in feedback applications |
| TA Range | –40°C to +125°C - supports operation in extended industrial and automotive ambient environments |
| IK A Max | ±20mA - determines maximum power dissipation capability (e.g., 360mW at 18V × 20mA) |
| VREF Drift | 11mV over –40°C to +125°C - quantifies worst-case reference shift affecting system accuracy |
Pinout & Package
TLV431AE5TA is housed in a 5-pin SOT25 (SC-74A) surface-mount package. Pin 2 (Anode) and Pin 5 (NC) are internally connected due to die attachment; Pin 5 must be left floating or tied to Pin 2 per layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Main current-sinking terminal; connects to supply rail or optocoupler LED anode in isolated PSUs |
| 2 | Anode | Reference ground node; electrically tied to Pin 5 in SOT25; must be connected to system GND or return path |
| 3 | Reference | Sense input for feedback divider; regulates voltage between REF and ANODE to 1.24V |
| 4 | NC | No internal connection; must remain unconnected or grounded only if required by PCB thermal relief |
| 5 | NC (tied to Pin 2) | Internally bonded to Anode; floating or connected to Pin 2 per Diodes' layout note to avoid parasitic paths |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage reference | 1.24V VREF enables regulation of outputs down to ~2.7V when used with optocoupler (1.4V LED drop + 1.24V) |
| High-accuracy grade | ±1% initial tolerance (A-grade) provides tighter output voltage control than standard Zeners (±5–10%) |
| Low output impedance | 0.25Ω typical ZKA minimizes AC error in feedback loops and improves transient rejection |
| Wide temperature stability | 11mV total VREF drift over –40°C to +125°C ensures consistent performance in harsh environments |
| Lead-free & green | Fully RoHS 3 compliant, halogen- and antimony-free - meets IPC-1752A material declaration requirements |
Applications
| Isolated Flyback PSU Feedback | Adjustable Linear Regulator Enhancement |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 5–24V isolated flyback converters with optocoupler-coupled primary-side controller. IC Role / Device Role / Timing Role: Shunt regulator providing precise 1.24V reference to drive optocoupler LED; closes feedback loop across isolation barrier. Use Value: Enables ±1% output regulation accuracy and fast transient response via low 0.25Ω output impedance and 80µA min cathode current. |
Use Scenario: Improving output accuracy and flexibility of fixed-output LDOs (e.g., AP1084) by replacing their internal reference. IC Role / Device Role / Timing Role: External precision reference source that redefines output voltage via R1/R2 divider while preserving LDO's protection features. Use Value: Achieves 1.24–18V programmability and ±1% accuracy - surpassing typical LDO tolerance of ±2% and extending usable output range. |
| Overvoltage Monitoring Circuit | High-Current Shunt Regulator |
|
Use Scenario: Detecting overvoltage events on 3.3V/5V rails using comparator interface with TLV431 as precision threshold detector. IC Role / Device Role / Timing Role: Voltage reference input to comparator; triggers shutdown when sensed rail exceeds programmed threshold (e.g., 3.63V). Use Value: Delivers 1.24V reference with <11mV drift over temperature - enabling reliable 3% OV threshold accuracy from –40°C to +125°C. |
Use Scenario: Extending shunt regulation capability beyond 20mA by driving external NPN transistor (e.g., ZXTP2039F) with TLV431 output. IC Role / Device Role / Timing Role: Error amplifier controlling base current of series pass transistor; maintains VOUT = VREF(1+R1/R2). Use Value: Supports >500mA load current while retaining 1.24V reference accuracy and thermal stability of the core TLV431. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BFTA | 0.5% VREF tolerance (vs. 1%), SOT23 package (3-pin), no NC pins | Higher accuracy but lower power handling (330mW vs. 500mW); suited for space-constrained, low-current designs | Select when ±0.5% reference accuracy is mandatory and thermal/power margin allows SOT23 derating |
| TLVH431ACDBVR | Texas Instruments part; 1.24V, ±1%, SOT23-5, 20V max VKA, 80µA IK(min) | Identical electrical specs but different pinout (REF/CATH/ANODE/NC/NC); not pin-compatible with TLV431AE5TA | Choose only with board redesign; verify layout compatibility and TI's thermal derating curves for SOT23-5 |
Compared with TLV431BFTA, TLV431AE5TA trades 0.5% accuracy for higher power capability (500mW vs. 330mW) and SOT25's improved thermal resistance (250°C/W). Versus TLVH431ACDBVR, it offers identical spec compliance but requires no pinout adaptation - simplifying second-source qualification in existing SOT25 layouts.
Availability
TLV431AE5TA is available at Aetrix Electronics and suitable for isolated power supplies, voltage reference upgrades, overvoltage protection circuits, and industrial sensor signal conditioning requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TLV431AE5TA 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 design centers across Asia, Europe, and the US, serving industrial, computing, and consumer markets.
The TLV431 product line delivers cost-effective, high-precision shunt references optimized for feedback control in isolated DC-DC converters, LDO enhancement, and voltage supervision - targeting applications needing better accuracy and temperature stability than Zener diodes.
FAQ
What is the minimum cathode current required for regulation at 125°C?
The TLV431AE5TA requires a minimum cathode current of 100µA at –40°C to +125°C to maintain regulation, as specified in the Electrical Characteristics table under IKMIN at full temperature range. This value exceeds the 80µA typical at 0°C to +70°C, ensuring stable operation in high-temperature environments such as automotive engine control units or industrial motor drives.
Can TLV431AE5TA replace a 3.3V Zener diode directly?
No - the TLV431AE5TA is a 1.24V reference and cannot directly replace a 3.3V Zener. It requires two external resistors (R1, R2) to set output voltage: VOUT = 1.24V × (1 + R1/R2). For 3.3V, use R1 = 1.65kΩ and R2 = 1kΩ. Unlike Zeners, it needs a cathode current path and proper biasing to function.
Why is Pin 5 labeled NC but electrically tied to Pin 2 in SOT25?
In the SOT25 package, the silicon die is mounted on Pin 2's leadframe, creating an internal bond to Pin 5. Leaving Pin 5 floating avoids unintended current paths; connecting it to Pin 2 ensures mechanical robustness and consistent thermal behavior. This is a package-specific construction detail - not a functional signal pin.
How does TLV431AE5TA perform in optocoupler feedback versus TLV431AFTA?
Both share identical electrical specs, but TLV431AE5TA's SOT25 package offers 500mW power dissipation (vs. 330mW for SOT23), lower θJA (250°C/W vs. 380°C/W), and dedicated NC pins for enhanced layout control. In high-duty-cycle or high-ambient-temperature flyback designs, the SOT25 version sustains regulation more reliably under thermal stress.
TLV431AE5TA 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:
- ±1%
- 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
TLV431AE5TA FAQ
1.How can I place an order for TLV431AE5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431AE5TA 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 TLV431AE5TA reliable?
The price and inventory of TLV431AE5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431AE5TA is usually 5 days.
3.What payment methods are accepted for TLV431AE5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431AE5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431AE5TA?
TLV431AE5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431AE5TA 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 TLV431AE5TA?
For technical support, including TLV431AE5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431AE5TA requirements.
6.How does Aetrix verify that TLV431AE5TA is sourced from the original manufacturer or authorized distributors?
All TLV431AE5TA 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 TLV431AE5TA meets industry standards.
7.What is the process for return or replacement of TLV431AE5TA?
All TLV431AE5TA units undergo pre-shipment inspection (PSI). If there is an issue with TLV431AE5TA, 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 TLV431AE5TA part is unused and in its original packaging.
Return procedure for TLV431AE5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431AE5TA Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
Diodes Incorporated
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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