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Nexperia USA Inc. TL431MFDT,215
- Part No.:
- TL431MFDT,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431MFDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 2% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,318
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Product details
Overview
TL431MFDT,215 from Nexperia is a B-grade (0.5 % reference voltage tolerance), adjustable precision shunt regulator in SOT23 package with mirrored pinning (REF–K–A), operating across –40 °C to +125 °C, delivering 2.483 V to 2.507 V reference voltage at 10 mA cathode current, and supporting programmable output up to 36 V for isolated SMPS feedback loops.
For engineers reviewing the TL431MFDT,215 datasheet, TL431MFDT,215 pinout, TL431MFDT,215 application, or TL431MFDT,215 equivalent, key selection criteria include its mirrored SOT23 pin configuration, ±0.5 % Vref accuracy over extended temperature range, low 0.2 Ω dynamic impedance, and suitability for precision current sinking and voltage regulation in automotive-qualified power systems.
Technical Context
The TL431MFDT,215 implements a three-terminal shunt regulator architecture with an internal bandgap reference, error amplifier, and NPN output stage. Its mirrored pinout (Pin 1 = REF, Pin 2 = K, Pin 3 = A) distinguishes it from standard-pin variants and mandates correct PCB layout to avoid functional failure.
It operates as a two-resistor-programmable voltage reference with sink current capability from 1 mA to 100 mA, exhibiting typical temperature drift of ≤34 mV over –40 °C to +125 °C and dynamic cathode-anode impedance of 0.2 Ω below 1 kHz - enabling stable regulation in noisy switching environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (Vref) | 2483–2507 mV at IK = 10 mA, Tamb = 25 °C - enables precise 2.5 V基准 with ±0.5 % initial accuracy |
| Temperature Range | –40 °C to +125 °C - supports under-hood and industrial control applications without derating |
| Cathode Current (IK) | 1–100 mA - provides sufficient sink capability for optocoupler biasing and error amplification in SMPS |
| Dynamic Impedance (ZKA) | 0.2 Ω typical <1 kHz - ensures minimal output perturbation during transient load steps |
| Reference Current (Iref) | 2–4 μA - allows high-value resistor networks (e.g., 100 kΩ/10 kΩ) to minimize power loss |
| Output Voltage Range | 2.495–36 V - set externally via two resistors, enabling flexible regulation beyond fixed-voltage references |
| ESD Rating | 4 kV HBM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.3 mm footprint, 0.95 mm height; thermal resistance Rth(j-a) = 360 K/W on standard FR4 PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | REF | Reference input node - connects to voltage divider midpoint; requires low-noise routing and optional 100 pF bypass |
| Pin 2 | K | Cathode - sinks regulated current into external load or optocoupler LED; must handle up to 100 mA continuous |
| Pin 3 | A | Anode - connects to system ground or return path; forms cathode-anode voltage drop (VKA) defining regulation point |
Key Features
| Feature | Design Value |
|---|---|
| 0.5 % reference voltage tolerance | B-grade accuracy enables tighter output voltage control in closed-loop SMPS designs without trimming |
| Mirrored SOT23 pinout (REF–K–A) | Prevents misrouting vs. standard TL431 variants; requires dedicated footprint and assembly verification |
| Low 0.2 Ω dynamic impedance | Minimizes output voltage deviation during fast load transients in feedback paths |
| –40 °C to +125 °C operation | Validated for extended-temperature automotive and industrial power supply use without external compensation |
| 100 mA max cathode sink current | Drives standard optocouplers (e.g., PC817) directly without buffer transistor |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt regulator providing error signal to optocoupler LED, closing voltage loop across transformer barrier. Use Value: 0.5 % Vref tolerance and low ZKA ensure ±1 % output regulation stability despite primary-side component variance and temperature drift. |
Use Scenario: Constant-current biasing of laser diodes or LED strings in instrumentation. IC Role / Device Role / Timing Role: Adjustable shunt element setting precise sink current via two-resistor network referenced to Vref. Use Value: 2–4 μA Iref enables high-impedance programming (e.g., 1 MΩ/10 kΩ), reducing power dissipation while maintaining 0.5 % current accuracy. |
| Programmable Voltage Reference | Overvoltage Protection Threshold |
Use Scenario: Configurable reference for ADCs, comparators, or supervisor ICs in battery management systems. IC Role / Device Role / Timing Role: Precision 2.5 V baseline scaled to 3.3 V, 5 V, or 12 V using external resistors. Use Value: Extended –40 °C to +125 °C operation guarantees reference stability across full system thermal envelope without calibration. |
Use Scenario: Trigger point for crowbar or shutdown circuits in DC power rails (e.g., 12 V automotive bus). IC Role / Device Role / Timing Role: Comparator input reference generating trip signal when sensed voltage exceeds programmed threshold. Use Value: Sharp turn-on characteristic and low 9 mV typical tempco enable repeatable, hysteresis-free overvoltage detection across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431FDT,215 | Standard grade (2.0 % Vref tolerance); same SOT23 mirrored pinout and –40 °C to +125 °C range | Acceptable where ±2 % output regulation suffices; lower cost but higher voltage drift over temperature | Select when cost sensitivity outweighs tight regulation needs and thermal stability is secondary |
| TL431ACDBZR,215 | A-grade (1.0 % Vref); standard SOT23 pinout (K–REF–A); 0 °C to +70 °C rating | Limited to commercial-temperature applications; incompatible pinout requires PCB redesign | Choose only if ambient stays within 0–70 °C and board layout permits standard pin mapping |
Compared with TL431FDT,215, TL431MFDT,215 delivers 4× tighter Vref tolerance and identical thermal range; versus TL431ACDBZR,215, it trades wider temperature coverage and mirrored pin compatibility for 2× better accuracy - making it optimal for automotive-qualified, high-stability SMPS feedback.
Availability
TL431MFDT,215 is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, and programmable voltage reference applications requiring stable component supply across automotive and industrial temperature ranges.
Supply support for TL431MFDT,215 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
Nexperia is a global semiconductor expert focused on efficiency-driven solutions, delivering high-performance logic, analog, and discrete components with emphasis on reliability and manufacturability.
TL431MFDT,215 belongs to Nexperia's precision shunt regulator product line, engineered for robust voltage reference and current regulation in automotive-qualified power conversion and industrial control systems.
FAQ
What is the pin configuration of TL431MFDT,215?
TL431MFDT,215 uses mirrored SOT23 pinout: Pin 1 = REF, Pin 2 = K (cathode), Pin 3 = A (anode). This differs from standard TL431 variants (K–REF–A) and must be verified in layout to prevent functional failure. The marking code is "AU%" per datasheet Table 5.
Does TL431MFDT,215 support automotive applications?
No - although TL431MFDT,215 is rated for –40 °C to +125 °C, the revision history (Table 11) explicitly states that this part was changed to standard qualification in Rev. 8 (2025), removing prior AEC-Q100 automotive qualification. It is not approved for automotive safety-critical use.
What is the minimum cathode current required for regulation?
The minimum cathode current (IK(min)) for TL431MFDT,215 is 0.4 mA maximum at –40 °C to +125 °C, per Table 10. Operation below this level risks loss of regulation; design must ensure ≥0.6 mA under worst-case conditions including resistor tolerance and temperature drift.
How does the mirrored pinout affect PCB layout?
The mirrored pinout (REF–K–A) requires a dedicated SOT23 footprint where Pin 1 lands connect to the reference divider node, not cathode. Using a standard SOT23 footprint will reverse REF and K connections, causing open-loop behavior or latch-up. Layout files must be validated against Nexperia's SOT23 outline (Fig. 27).
TL431MFDT,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- ±2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TL431MFDT,215 FAQ
1.How can I place an order for TL431MFDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431MFDT,215 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 TL431MFDT,215 reliable?
The price and inventory of TL431MFDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431MFDT,215 is usually 5 days.
3.What payment methods are accepted for TL431MFDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431MFDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431MFDT,215?
TL431MFDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431MFDT,215 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 TL431MFDT,215?
For technical support, including TL431MFDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431MFDT,215 requirements.
6.How does Aetrix verify that TL431MFDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431MFDT,215 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 TL431MFDT,215 meets industry standards.
7.What is the process for return or replacement of TL431MFDT,215?
All TL431MFDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431MFDT,215, 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 TL431MFDT,215 part is unused and in its original packaging.
Return procedure for TL431MFDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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