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Nexperia USA Inc. TL431AFDT,215
- Part No.:
- TL431AFDT,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431AFDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:51,229
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Product details
Overview
TL431AFDT,215 from Nexperia is an A-grade (±1.0 %) adjustable precision shunt regulator in SOT23 package, featuring 2.495 V reference voltage, 1 mA to 100 mA sink current capability, and operation across –40 °C to +125 °C. It serves as a programmable voltage reference or error amplifier in isolated SMPS feedback loops, precision current sinks, and on-board regulation circuits.
For engineers reviewing the TL431AFDT,215 datasheet, TL431AFDT,215 pinout, TL431AFDT,215 application, or TL431AFDT,215 equivalent, this page delivers verified electrical parameters, thermal derating curves, SOT23 pin mapping, real-world use cases in power control and sensing, and validated alternative parts with documented tolerance and temperature range differences.
Technical Context
The TL431AFDT,215 implements a three-terminal shunt regulator architecture with internal bandgap reference, error amplifier, and NPN output stage. Its reference voltage is set externally via two resistors between cathode, anode, and REF pins, enabling output programming from 2.495 V to 36 V.
It delivers 0.2 Ω typical dynamic cathode-anode impedance below 1 kHz and exhibits ≤9 mV reference drift over 0 °C to 70 °C - critical for stable feedback in high-efficiency DC-DC converters and industrial sensor signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (Vref) | 2495 mV ±1.0 % at IK = 10 mA, Tamb = 25 °C - enables precise threshold setting in comparator and regulator designs |
| Cathode current range | 1 mA to 100 mA - supports direct sinking of feedback signals without external amplification |
| Operating temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial embedded power supplies |
| Dynamic impedance (ZKA) | 0.2 Ω typical at f < 1 kHz - ensures low-noise, high-stability regulation under transient load conditions |
| Reference current (Iref) | 2.0 µA to 4.0 µA - minimizes resistor network loading, preserving accuracy in high-impedance divider configurations |
| Output voltage range | 2.495 V to 36 V - programmable via external R1/R2 resistors, eliminating need for multiple fixed-voltage regulators |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.3 mm footprint, 0.95 mm height; standard pinning configuration per Table 3 (REF on Pin 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Current-sink output node; connects to regulated rail or optocoupler LED anode in SMPS feedback |
| 2 (REF) | Reference input | High-impedance input sensing voltage divider midpoint; sets regulation point when biased at 2.495 V |
| 3 (A) | Anode | Return path for cathode current; tied to system ground or low-side return in shunt configurations |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.495 V to 36 V using only two external resistors - reduces BOM count vs. fixed-voltage references |
| A-grade reference tolerance | ±1.0 % over full temperature range - improves closed-loop accuracy in battery management and motor control |
| Low output impedance | 0.2 Ω typical - maintains regulation stability despite ripple or step-load transients in switching supplies |
| Wide sink current capability | 1 mA minimum turn-on, up to 100 mA continuous - drives optocouplers directly without buffer transistors |
| Thermal stability | ≤34 mV reference variation over –40 °C to +125 °C - ensures consistent performance in unheated enclosures |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage regulation in flyback or forward converters with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Error amplifier comparing sampled output against 2.495 V reference; drives optocoupler LED to adjust primary-side duty cycle. Use Value: Enables ±1.0 % output regulation across line/load/temperature without secondary-side LDO, reducing component count and cost. |
Use Scenario: Constant-current biasing of laser diodes or LED strings in industrial lighting and sensing modules. IC Role / Device Role / Timing Role: Shunt regulator configured as current sink by fixing REF voltage and varying cathode load resistance. Use Value: Delivers stable 10–100 mA current with <±1 % drift over –40 °C to +125 °C, eliminating need for op-amp-based current sources. |
| On-Board Voltage Reference | Single-Supply Comparator Threshold |
Use Scenario: Providing accurate 2.495 V reference for ADCs, DACs, or analog front-ends in PLC I/O modules. IC Role / Device Role / Timing Role: Precision shunt reference connected between supply and ground, decoupled with 100 pF capacitor at REF pin. Use Value: Replaces Zener diodes with superior temperature coefficient (9 mV/70 °C) and lower noise, improving measurement repeatability. |
Use Scenario: Generating temperature-compensated trip point for overvoltage protection in 5 V or 12 V rail monitors. IC Role / Device Role / Timing Role: Reference input used as comparator threshold; cathode/anode form high-impedance sensing node. Use Value: Achieves stable 2.495 V threshold independent of supply variation, enabling reliable fault detection without trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BFDT,215 | 0.5 % reference tolerance (vs. 1.0 %); same SOT23 package and –40 °C to +125 °C rating | Required where tighter regulation (e.g., medical power supplies) justifies higher cost and tighter test screening | Select BFDT only if system-level calibration budget demands sub-1 % reference uncertainty |
| TL431FDT,215 | 2.0 % reference tolerance; otherwise identical pinout, package, and temperature range | Suitable for non-critical auxiliary rails or cost-sensitive consumer power adapters | Choose FDT where ±2 % regulation meets spec and BOM cost reduction is prioritized over precision |
Compared with TL431AFDT,215, the BFDT offers higher accuracy at increased unit cost and test overhead, while the FDT trades tolerance for lower procurement cost - making the AFDT the optimal balance for industrial-grade power control requiring verified ±1 % performance across extended temperature.
Availability
TL431AFDT,215 is available at Aetrix Electronics and suitable for isolated SMPS feedback loops, precision current sinks, and on-board voltage references requiring stable component supply across automotive, industrial, and telecom power systems.
Supply support for TL431AFDT,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 delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.
TL431AFDT,215 belongs to Nexperia's precision analog shunt regulator product line, engineered for high-accuracy voltage reference and feedback functions in space-constrained, thermally demanding power conversion systems.
FAQ
What is the minimum cathode current required for regulation in TL431AFDT,215?
The TL431AFDT,215 requires a minimum cathode current of 0.4 mA at Tamb = –40 °C to +125 °C to maintain regulation. This value is confirmed in Table 10 under "IK(min)" for A-Grade devices with mirrored or normal pinning. Below this threshold, the device exits active regulation and reference voltage becomes undefined.
Can TL431AFDT,215 replace a Zener diode in a 12 V shunt regulator?
Yes - TL431AFDT,215 replaces Zener diodes with superior performance: it achieves ±1.0 % reference accuracy versus typical ±5 % Zener tolerance, offers 0.2 Ω dynamic impedance (vs. >10 Ω for Zeners), and provides programmable output up to 36 V using two resistors. Its 1 mA–100 mA sink range also supports direct drive of optocouplers in feedback paths.
Does TL431AFDT,215 require an external capacitor at the REF pin?
Yes - a 100 pF capacitor is recommended between REF and ground to suppress high-frequency noise coupling into the reference input, especially in SMPS feedback applications. This value is specified in Figure 26 of the datasheet and prevents instability caused by switching transients injected from the primary side through optocoupler capacitance.
Is TL431AFDT,215 qualified for automotive use?
No - although TL431AFDT,215 operates across –40 °C to +125 °C, its revision history (Table 11, Rev. 8) explicitly states that it was changed to standard qualification status in April 2024 and is no longer AEC-Q100 qualified. Automotive applications require TL431AQDBZR or other Q-grade variants explicitly marked as AEC-Q100 compliant.
TL431AFDT,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
TL431AFDT,215 FAQ
1.How can I place an order for TL431AFDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AFDT,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 TL431AFDT,215 reliable?
The price and inventory of TL431AFDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AFDT,215 is usually 5 days.
3.What payment methods are accepted for TL431AFDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AFDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AFDT,215?
TL431AFDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AFDT,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 TL431AFDT,215?
For technical support, including TL431AFDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AFDT,215 requirements.
6.How does Aetrix verify that TL431AFDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431AFDT,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 TL431AFDT,215 meets industry standards.
7.What is the process for return or replacement of TL431AFDT,215?
All TL431AFDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AFDT,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 TL431AFDT,215 part is unused and in its original packaging.
Return procedure for TL431AFDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AFDT,215 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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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
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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