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Nexperia USA Inc. TL431AMFDT,215
- Part No.:
- TL431AMFDT,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431AMFDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:25,097
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Product details
Overview
TL431AMFDT,215 from Nexperia is an A-grade (±1.0 %) adjustable precision shunt regulator in SOT23 package with mirrored pinning (REF–K–A), operating from −40 °C to 125 °C, delivering 2.470 V to 2.520 V reference voltage at 10 mA cathode current, and supporting programmable output voltages up to 36 V in isolated SMPS feedback loops.
For engineers reviewing the TL431AMFDT,215 datasheet, TL431AMFDT,215 pinout, TL431AMFDT,215 application, or TL431AMFDT,215 equivalent, key selection criteria include reference tolerance (1.0 %), temperature range (−40 °C to +125 °C), mirrored SOT23 pinout, dynamic impedance (0.2 Ω), and sink current capability (1 mA to 100 mA).
Technical Context
The TL431AMFDT,215 implements a three-terminal shunt regulator architecture with an internal bandgap reference, error amplifier, and NPN output stage. Its mirrored pinning (Pin 1 = REF, Pin 2 = K, Pin 3 = A) distinguishes it from standard-pin variants and requires PCB layout verification for correct feedback routing.
It operates as a two-resistor-programmable voltage reference with sharp turn-on characteristics and low output noise, enabling stable regulation in both shunt and series-pass configurations. The device maintains ≤1.0 % reference voltage tolerance across −40 °C to +125 °C and exhibits typical dynamic cathode-anode impedance of 0.2 Ω below 1 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (Vref) | 2470–2520 mV at 10 mA, IK = 10 mA, Tamb = 25 °C - defines accuracy of programmable output setting |
| Reference tolerance | ±1.0 % over −40 °C to +125 °C - enables high-accuracy feedback in automotive/industrial environments |
| Cathode current (IK) | 1–100 mA operational range - supports direct shunt regulation or driving optocoupler LEDs in isolated supplies |
| Dynamic impedance (ZKA) | 0.2 Ω typical at f < 1 kHz - ensures minimal output voltage perturbation under load transients |
| Reference current (Iref) | 2–4 μA at 25 °C - determines minimum resistor values for stable biasing of external divider network |
| Tempco (ΔVref) | ≤34 mV over −40 °C to +125 °C - guarantees predictable drift in wide-temperature applications |
| Max cathode-anode voltage (VKA) | 36 V - sets upper limit for programmable output voltage when used with external resistors |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.3 mm footprint, 0.95 mm height, with mirrored pinning configuration specific to MFDT-suffixed variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | REF | Reference input node - connects to voltage divider midpoint; must be decoupled with ~100 pF for SMPS stability |
| Pin 2 | K | Cathode - sinks regulated current; connects to supply rail or optocoupler anode in feedback loops |
| Pin 3 | A | Anode - ties to system ground or return path; forms current sink path with cathode |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage references |
| A-grade precision | ±1.0 % reference tolerance over −40 °C to +125 °C - meets industrial and extended-temperature design requirements |
| Low dynamic impedance | 0.2 Ω typical - provides tight regulation under fast load steps without external compensation |
| Mirrored SOT23 pinout | REF–K–A sequence (vs. standard K–REF–A) - enables layout compatibility with legacy TL431 footprints only when verified |
| Low reference current | 2–4 μA - minimizes power loss in high-impedance feedback networks and extends battery life in low-power systems |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator providing stable reference to drive optocoupler LED, closing control loop across isolation barrier. Use Value: Enables ±1.0 % output regulation over full temperature range without secondary-side LDO, reducing BOM count and board area. | Use Scenario: Constant-current biasing of laser diodes or LED strings in instrumentation and lighting. IC Role / Device Role / Timing Role: Precision shunt element establishing accurate current setpoint via external sense resistor. Use Value: Delivers 1–100 mA sink current with <34 mV reference drift over −40 °C to +125 °C, eliminating thermal calibration. |
| Programmable Shunt Regulator | Single-Supply Comparator |
Use Scenario: On-board 3.3 V or 5 V regulation from higher intermediate bus in embedded power domains. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing Zener diodes with superior accuracy and thermal stability. Use Value: Achieves 0.2 Ω dynamic impedance and sharp turn-on, improving transient response vs. discrete Zener solutions. | Use Scenario: Threshold detection in battery monitoring or overvoltage protection circuits with temperature-stable trip point. IC Role / Device Role / Timing Role: Precision reference source feeding comparator input; threshold equals Vref × (1 + R1/R2). Use Value: Provides 2.495 V base reference with ±1.0 % tolerance and <9 mV/°C drift, ensuring repeatable switching across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AFDT,215 | Same A-grade tolerance (±1.0 %), same −40 °C to +125 °C range, but uses standard pinning (K–REF–A) | Requires PCB redesign due to reversed REF/K placement; unsuitable for drop-in replacement in mirrored layouts | Select when existing layout uses standard SOT23 orientation and no pinout revision is feasible |
| TL431BQDBZR | B-grade (±0.5 %) tolerance, standard pinning, commercial temp range (−40 °C to +85 °C), SOT23 package | Lacks extended temperature rating; not qualified for 125 °C operation or harsh-environment use | Choose only for cost-sensitive, non-automotive applications where tighter tolerance outweighs temperature range needs |
Compared with TL431AFDT,215, TL431AMFDT,215 offers identical electrical performance but mandates mirrored layout; versus TL431BQDBZR, it trades 0.5 % tolerance for guaranteed 125 °C operation and automotive-qualified reliability-critical for engine control or industrial motor drives.
Availability
TL431AMFDT,215 is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, programmable shunt regulation, and single-supply comparator circuits requiring stable component supply across extended temperature ranges.
Supply support for TL431AMFDT,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 essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The TL431 family belongs to Nexperia's precision analog portfolio, designed specifically for voltage reference and shunt regulation in space-constrained, thermally demanding power management systems.
FAQ
What is the pinout configuration of TL431AMFDT,215?
TL431AMFDT,215 uses mirrored SOT23 pinning: 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 PCB layout to avoid feedback misconnection.
Does TL431AMFDT,215 support automotive qualification?
No-per Revision 8 (20250903) of the datasheet, TL431AMFDT,215 was removed from AEC-Q100 qualification status and is not approved for automotive applications. It remains rated for industrial use across −40 °C to +125 °C.
What is the minimum cathode current required for regulation?
The minimum cathode current (IK(min)) is 0.4 mA at −40 °C to +125 °C. Below this, the device exits regulation; designs must ensure ≥0.6 mA under worst-case conditions to maintain ±1.0 % reference accuracy.
How does TL431AMFDT,215 differ from TL431CDBZR?
TL431AMFDT,215 is A-grade (±1.0 %), −40 °C to +125 °C, mirrored pinning; TL431CDBZR is standard-grade (±2.0 %), 0 °C to +70 °C, standard pinning. They share SOT23 package but differ in accuracy, temperature range, pinout, and qualification status.
TL431AMFDT,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:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TL431AMFDT,215 FAQ
1.How can I place an order for TL431AMFDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AMFDT,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 TL431AMFDT,215 reliable?
The price and inventory of TL431AMFDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AMFDT,215 is usually 5 days.
3.What payment methods are accepted for TL431AMFDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AMFDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AMFDT,215?
TL431AMFDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AMFDT,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 TL431AMFDT,215?
For technical support, including TL431AMFDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AMFDT,215 requirements.
6.How does Aetrix verify that TL431AMFDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431AMFDT,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 TL431AMFDT,215 meets industry standards.
7.What is the process for return or replacement of TL431AMFDT,215?
All TL431AMFDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AMFDT,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 TL431AMFDT,215 part is unused and in its original packaging.
Return procedure for TL431AMFDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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