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Diodes Incorporated TL431AW5-7
- Part No.:
- TL431AW5-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431AW5-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
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Product details
Overview
TL431AW5-7 from Diodes Incorporated is a precision adjustable shunt regulator in SOT25 package, functioning as a programmable 2.495V reference with ±1.0% initial tolerance at 25°C, 1mA–100mA cathode sink current capability, and 0.2Ω typical dynamic output impedance. It replaces discrete Zener diodes in feedback loops of isolated DC-DC converters requiring stable voltage regulation across -40°C to +125°C.
For engineers reviewing the TL431AW5-7 datasheet, TL431AW5-7 pinout, TL431AW5-7 application, or TL431AW5-7 equivalent, this device is selected for high-accuracy voltage thresholding, optocoupler-based feedback stabilization, and low-noise reference generation where temperature drift ≤34mV over -40°C to +125°C and cathode voltage range up to 36V are critical design constraints.
Technical Context
The TL431AW5-7 implements a bandgap-referenced error amplifier with internal 2.495V reference, enabling precise voltage regulation via external resistor divider. Its operation requires minimum 0.4mA cathode current for regulation onset and supports stable operation with load capacitance from 5nF to >300nF depending on cathode current level.
It features low 0.2Ω dynamic output impedance, <2.5µA reference input current deviation over full temperature range, and -1.4 to -2.7mV/V cathode voltage sensitivity-critical for minimizing output variation in variable-input applications such as overvoltage protection circuits and adjustable linear regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1.0% at 25°C - sets accurate regulation point for external resistor network |
| Cathode Voltage Range | 2.5V to 36V - enables wide-output adjustable regulation without external series pass transistor |
| Cathode Current Range | 1mA to 100mA - supports direct sinking for medium-power feedback paths and bias networks |
| Dynamic Output Impedance | 0.2Ω typical - ensures minimal output voltage shift under dynamic load transients |
| Temp. Drift (–40°C to +125°C) | ≤34mV deviation - guarantees stable reference performance in automotive and industrial ambient conditions |
| Reference Input Current | 1–4µA - minimizes divider resistor power loss and thermal drift in high-impedance networks |
| Output Noise Density | ~250nV/√Hz at 10kHz - suitable for low-noise analog sensing and precision ADC reference buffering |
Pinout & Package
TL431AW5-7 is housed in a RoHS-compliant, halogen-free SOT25 (5-pin) surface-mount package with exposed pad thermal enhancement. Pin 1 = Anode, Pin 2 = Reference, Pin 3 = Cathode, Pin 4 = NC (no connect), Pin 5 = Anode (dual-anode configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Ground reference node | Common return path for reference and cathode current; must be low-impedance to minimize ground bounce |
| Pin 2 (Reference) | High-impedance feedback input | Connects to resistor divider midpoint; draws only 1–4µA, enabling high-value divider networks |
| Pin 3 (Cathode) | Regulated output sink terminal | Delivers up to 100mA sink current; voltage at this pin is controlled relative to anode |
| Pin 4 (NC) | No internal connection | Must remain unconnected or floating; not tied to any internal circuitry |
| Pin 5 (Anode) | Secondary anode terminal | Electrically identical to Pin 1; provides mechanical stability and enhanced thermal conduction in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable 2.5V–36V output | Programmed via two external resistors-eliminates need for multiple fixed-voltage Zeners |
| ±1.0% reference tolerance (A-grade) | Reduces calibration overhead in production test; enables tighter output voltage bins without trimming |
| 0.2Ω dynamic output impedance | Maintains regulation accuracy during fast load steps in SMPS feedback loops |
| -40°C to +125°C operating range | Validated for under-hood automotive, industrial motor drives, and outdoor power systems |
| Low 250nV/√Hz input noise | Preserves signal integrity in precision instrumentation and sensor excitation circuits |
Applications
| Isolated Flyback Feedback | Overvoltage Protection Circuit |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in AC/DC flyback converters with optocoupler isolation. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable 2.5V reference to drive optocoupler LED, closing feedback loop across isolation barrier. Use Value: Enables ±1% output voltage regulation despite transformer winding ratio variation and optocoupler CTR degradation over temperature and lifetime. |
Use Scenario: Monitoring DC bus voltage in battery management or power supply rails to trigger shutdown above safe threshold. IC Role / Device Role / Timing Role: Adjustable voltage comparator with built-in reference, comparing sensed voltage against user-set threshold via resistor divider. Use Value: Delivers fast response (<10µs pulse rise time) and stable trip point (≤34mV drift over -40°C to +125°C) without external op-amp or reference IC. |
| Programmable Linear Regulator | Optocoupler Linearizer |
|
Use Scenario: Generating variable output voltage from fixed input using external PNP pass transistor and feedback network. IC Role / Device Role / Timing Role: Shunt regulator acting as error amplifier and reference source controlling base current of series pass transistor. Use Value: Achieves <0.5% line/load regulation and 60dB PSRR by leveraging low output impedance and tight VREF tolerance. |
Use Scenario: Compensating nonlinearity in optocoupler current transfer ratio (CTR) across temperature and aging. IC Role / Device Role / Timing Role: High-stability reference driving optocoupler LED with constant current, decoupling output from CTR variation. Use Value: Reduces signal distortion in analog isolation channels to <0.1% THD by stabilizing LED bias independent of phototransistor gain drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACZ-AP (Diodes Inc.) | SOT23-3 package; single-anode; 330mW power rating vs. 500mW in SOT25 | Limited thermal margin in high-current (>50mA) continuous operation; no NC pin for layout flexibility | Select when board space is constrained and cathode current remains ≤40mA with adequate copper pour |
| ON Semiconductor NCP431ASN2T1G | Same SOT25-5 pinout; ±0.5% B-grade tolerance; higher 0.35Ω typical ZKA | Better initial accuracy but higher output impedance reduces transient regulation in fast-switching supplies | Prefer for metrology-grade references where long-term stability outweighs dynamic response needs |
Compared with TL431AW5-7, TL431ACZ-AP trades thermal headroom and layout flexibility for compactness, while NCP431ASN2T1G offers tighter initial tolerance at the cost of reduced dynamic regulation performance-making TL431AW5-7 optimal for cost-sensitive, thermally demanding, and transient-critical feedback designs.
Availability
TL431AW5-7 is available at Aetrix Electronics and suitable for isolated DC-DC converters, overvoltage protection systems, and programmable linear regulators requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for TL431AW5-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-standard-compliant components for power management, signal integrity, and protection applications.
TL431AW5-7 belongs to Diodes' precision reference regulator product line, engineered for replacement of Zener diodes in feedback, protection, and threshold-detection circuits demanding robust temperature stability and low output impedance.
FAQ
What is the minimum cathode current required for regulation in TL431AW5-7?
The TL431AW5-7 requires a minimum cathode current of 0.4mA to maintain regulation, verified per datasheet Electrical Characteristics table at TA = 25°C. Below this threshold, the device enters high-impedance off-state with cathode leakage <0.5µA at 36V-an essential parameter for designing low-power standby modes in energy-efficient power supplies.
Can TL431AW5-7 be used with capacitive loads, and what are the stability limits?
Yes-TL431AW5-7 is stable with capacitive loads across three defined ranges: ≤50pF (all currents), 5nF–20nF (all currents), and >300nF (all currents). With cathode current ≤5mA, it remains stable at any capacitance value. These boundaries are validated in the datasheet's Stability Boundary Conditions chart and enable reliable use in filtering, soft-start, and compensation networks without external compensation.
How does the dual-anode configuration (Pins 1 and 5) affect PCB layout and thermal performance?
Pins 1 and 5 are internally shorted anode terminals. Using both improves thermal conduction to the PCB copper plane and enhances mechanical anchoring. Layout best practice is to connect both pins to the same low-impedance ground plane with ≥2 thermal vias each-reducing junction-to-ambient thermal resistance from 250°C/W (typical SOT25) to ~180°C/W in optimized layouts, critical for sustained 100mA operation.
Is TL431AW5-7 compatible with lead-free reflow profiles, and what is its MSL rating?
TL431AW5-7 is fully RoHS-compliant and rated for standard lead-free reflow (J-STD-020D Level 1), with peak temperature tolerance up to 260°C. Its moisture sensitivity level is MSL1-unlimited floor life at ≤30°C/60% RH-eliminating bake requirements and supporting high-throughput SMT assembly without moisture-related delamination risk.
TL431AW5-7 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):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
TL431AW5-7 FAQ
1.How can I place an order for TL431AW5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AW5-7 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 TL431AW5-7 reliable?
The price and inventory of TL431AW5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AW5-7 is usually 5 days.
3.What payment methods are accepted for TL431AW5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AW5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AW5-7?
TL431AW5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AW5-7 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 TL431AW5-7?
For technical support, including TL431AW5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AW5-7 requirements.
6.How does Aetrix verify that TL431AW5-7 is sourced from the original manufacturer or authorized distributors?
All TL431AW5-7 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 TL431AW5-7 meets industry standards.
7.What is the process for return or replacement of TL431AW5-7?
All TL431AW5-7 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AW5-7, 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 TL431AW5-7 part is unused and in its original packaging.
Return procedure for TL431AW5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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