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Nexperia USA Inc. TL431MFDT-QR
- Part No.:
- TL431MFDT-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431MFDT-QR.pdf
- Description:
- IC VREF SHUNT 2.495V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,348
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Product details
Overview
TL431MFDT-QR from Nexperia is a B-grade (±0.5 %) adjustable precision shunt regulator in SOT23 package with mirrored pinning (REF–K–A), rated for −40 °C to +125 °C operation, 2.483 V to 2.507 V reference voltage at 10 mA cathode current, 0.2 Ω dynamic cathode-anode impedance, and AEC-Q100 Grade 1 qualification - used in isolated SMPS feedback loops requiring high-accuracy voltage regulation.
For engineers reviewing the TL431MFDT-QR datasheet, TL431MFDT-QR pinout, TL431MFDT-QR application, or TL431MFDT-QR equivalent, this page delivers verified pin configuration, automotive-grade thermal stability data, mirrored-pin SOT23 layout guidance, and validated alternatives for precision shunt regulation in safety-critical power systems.
Technical Context
The TL431MFDT-QR implements an internal bandgap reference and transconductance amplifier driving an NPN output stage, enabling precise two-resistor programmable output from 2.495 V to 36 V. 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 3-terminal active shunt: reference input controls cathode current sink behavior; cathode-anode voltage swing up to 36 V is supported; and its 0.2 Ω dynamic impedance ensures stable regulation under load transients up to 100 mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.483 V to 2.507 V @ 10 mA, IK - defines ±0.5 % accuracy window for precision feedback setpoints |
| Cathode Current Range | 0.4 mA to 100 mA - supports low-power biasing and high-current shunt regulation without external amplification |
| Dynamic Cathode-Anode Impedance | 0.2 Ω typical @ f < 1 kHz - enables tight voltage regulation under fast load steps in SMPS control loops |
| Temperature Range | −40 °C to +125 °C - qualified for under-hood automotive environments and industrial power supplies |
| Reference Voltage Drift | ±34 mV max over −40 °C to +125 °C - ensures stable setpoint across full automotive thermal profile |
| AEC-Q100 Grade | Grade 1 (−40 °C to +125 °C) - certified for automotive powertrain and body electronics applications |
| ESD Rating | 4 kV HBM - provides robustness against handling and board-level electrostatic discharge events |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm × 1.0 mm body, 0.95 mm pitch; mirrored pinning configuration specific to MFDT-Q suffix variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | REF | High-impedance reference input; connects to resistor divider midpoint - determines regulated output voltage |
| 2 | K | Cathode terminal; sinks current from regulated rail - must route with low-inductance path for stability |
| 3 | A | Anode terminal; connects to system ground or return path - forms current sink loop with cathode |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.495 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage regulators in multi-rail designs |
| B-Grade Reference Accuracy | ±0.5 % tolerance - enables tighter output voltage margins in automotive ADAS and infotainment power supplies |
| Low Dynamic Impedance | 0.2 Ω typical - maintains regulation during rapid load changes in isolated DC-DC converters |
| Mirrored Pinout Configuration | REF–K–A (Pin 1–2–3) - prevents misrouting in automated assembly when replacing standard-pin TL431 variants |
| AEC-Q100 Qualified | Grade 1 compliance - satisfies automotive reliability requirements without additional qualification effort |
Applications
| Automotive Isolated SMPS Feedback | Industrial Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage sensing in 12 V/48 V automotive DC-DC converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt regulator providing accurate reference to optocoupler LED drive circuit - sets regulated output voltage via resistor divider on secondary side. Use Value: ±0.5 % reference accuracy ensures <±1 % output voltage tolerance across temperature, meeting ASIL-B power supply requirements. |
Use Scenario: Constant-current source for LED driver biasing in factory automation sensors. IC Role / Device Role / Timing Role: Precision current sink using cathode as controlled current node - converts reference voltage into stable sink current via external sense resistor. Use Value: 0.2 Ω dynamic impedance minimizes current error during PWM dimming transients, maintaining ±0.5 % current accuracy. |
| Programmable Overvoltage Protection | High-Accuracy Series Pass Regulator |
Use Scenario: Threshold detector in battery management system (BMS) cell monitoring circuits. IC Role / Device Role / Timing Role: Comparator with temperature-compensated threshold - REF pin biased to trigger protection when sensed voltage exceeds setpoint. Use Value: ±34 mV reference drift over −40 °C to +125 °C ensures consistent trip point without calibration across vehicle lifetime. |
Use Scenario: Low-noise linear post-regulator for FPGA core voltage in telecom base station power modules. IC Role / Device Role / Timing Role: Error amplifier in series pass configuration - drives external P-MOSFET gate to regulate output with high PSRR. Use Value: Low 2–4 μA reference current reduces quiescent power loss and improves light-load efficiency vs. discrete op-amp solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AFDT-Q | A-grade (±1.0 %) tolerance; standard pinning (K–REF–A); same SOT23 package | Lower accuracy but pin-compatible with legacy TL431 layouts - suitable where ±1 % suffices and board redesign is prohibited | Select when existing PCB uses standard pinout and reference accuracy ≥ ±1 % is acceptable |
| TL431BMFDT-Q | Identical B-grade (±0.5 %) spec and mirrored pinout - differs only in marking code (AW% vs AU%) and date code traceability | No functional or application difference - fully interchangeable in design and manufacturing | Choose for dual-sourcing or extended lifecycle continuity; identical electrical and mechanical behavior |
Compared with TL431MFDT-QR, TL431AFDT-Q trades 0.5 % accuracy for pin compatibility with legacy designs, while TL431BMFDT-Q offers identical performance with alternate traceability - enabling risk-mitigated sourcing without design change.
Availability
TL431MFDT-QR is available at Aetrix Electronics and suitable for automotive power conversion, industrial current regulation, battery protection circuits, and isolated feedback systems requiring stable component supply with AEC-Q100 compliance and long-term manufacturability.
Supply support for TL431MFDT-QR 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 essential efficiency technologies - delivering high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
TL431MFDT-QR belongs to the TL431-Q family of AEC-Q100 qualified shunt regulators, engineered specifically for automotive-grade precision voltage reference and current sink applications demanding extended temperature operation and long-term stability.
FAQ
What is the pinout configuration of TL431MFDT-QR?
TL431MFDT-QR uses mirrored pinning in SOT23: Pin 1 = REF, Pin 2 = K (cathode), Pin 3 = A (anode). This differs from standard TL431 variants (K–REF–A) and requires dedicated footprint layout - incorrect routing will prevent regulation.
How does TL431MFDT-QR achieve ±0.5 % reference accuracy?
TL431MFDT-QR achieves ±0.5 % reference accuracy through laser-trimmed bandgap circuitry and post-package test screening - specified as 2.483 V to 2.507 V at 10 mA cathode current and 25 °C, with ≤±34 mV drift over −40 °C to +125 °C.
Can TL431MFDT-QR replace standard-pin TL431s on existing PCBs?
No - TL431MFDT-QR's mirrored pinout (REF–K–A) is electrically incompatible with standard-pin layouts (K–REF–A). Direct replacement would short REF to cathode. A PCB redesign or adapter is required to maintain functional integrity.
What is the maximum cathode-anode voltage for continuous operation?
The maximum continuous cathode-anode voltage is 36 V per recommended operating conditions; absolute maximum rating is 37 V. Exceeding 36 V risks exceeding power dissipation limits - derating is required above 25 °C ambient per Figure 2's thermal curves.
TL431MFDT-QR 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:
- SOT-23-3 (TO-236)
TL431MFDT-QR FAQ
1.How can I place an order for TL431MFDT-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431MFDT-QR 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-QR reliable?
The price and inventory of TL431MFDT-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431MFDT-QR is usually 5 days.
3.What payment methods are accepted for TL431MFDT-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431MFDT-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431MFDT-QR?
TL431MFDT-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431MFDT-QR 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-QR?
For technical support, including TL431MFDT-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431MFDT-QR requirements.
6.How does Aetrix verify that TL431MFDT-QR is sourced from the original manufacturer or authorized distributors?
All TL431MFDT-QR 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-QR meets industry standards.
7.What is the process for return or replacement of TL431MFDT-QR?
All TL431MFDT-QR units undergo pre-shipment inspection (PSI). If there is an issue with TL431MFDT-QR, 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-QR part is unused and in its original packaging.
Return procedure for TL431MFDT-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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