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NXP Semiconductors TL431AMSDT,215
- Part No.:
- TL431AMSDT,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431AMSDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,499
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Product details
Overview
TL431AMSDT,215 from Nexperia is an A-grade (±1 %) adjustable precision shunt regulator in SOT23 package, featuring mirrored pinning (REF–k–a), 2.47 V to 2.52 V reference voltage at 25 °C, 0.2 Ω typical dynamic cathode-anode impedance, and operation across –40 °C to +125 °C for automotive-grade isolated feedback loops in SMPS designs.
For engineers reviewing the TL431AMSDT,215 datasheet, TL431AMSDT,215 pinout, TL431AMSDT,215 application, or TL431AMSDT,215 equivalent, key selection criteria include reference voltage tolerance, thermal drift over extended temperature range, cathode current capability (1–100 mA), and EMI ruggedness for switch-mode power supply feedback stability.
Technical Context
The TL431AMSDT,215 implements a three-terminal shunt regulator architecture with internal bandgap reference, error amplifier, and NPN output stage. It operates as a programmable voltage-controlled current sink, where the REF pin senses a resistive divider between cathode and anode to regulate VKA between 2.5 V and 36 V.
This variant belongs to the TL431xSDT family-designed for standard linear applications-and uses mirrored pinning (Pin 1 = REF, Pin 2 = k, Pin 3 = a), distinguishing it from normal-pinned variants. Its A-grade tolerance and –40 °C to +125 °C rating support automotive and industrial systems requiring stable voltage reference under thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (Vref) | 2.47 V to 2.52 V at 25 °C - sets minimum regulation threshold and defines accuracy of external resistor-based output programming |
| Reference Tolerance | ±1 % (A-Grade) - enables tighter output voltage control vs. standard (±2 %) or B-grade (±0.5 %) variants |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and high-temp industrial environments |
| Cathode Current Range | 1 mA to 100 mA - supports direct sinking into optocoupler LEDs or series pass transistors without external buffering |
| Dynamic Impedance (ZKA) | 0.2 Ω typical - ensures low AC impedance for stable closed-loop feedback in isolated SMPS topologies |
| Thermal Drift (ΔVref) | ≤34 mV over –40 °C to +125 °C - maintains reference stability across full automotive temperature range |
| EMI Ruggedness | Standard (not enhanced like FDT types) - suitable for linear regulators and non-noisy SMPS feedback, not high-dV/dt primary-side switching nodes |
Pinout & Package
SOT23 plastic surface-mounted package (TO-236AB), 3-pin, 1.9 mm × 1.1 mm footprint, 1.1 mm height, lead pitch 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | REF | Reference input - connects to voltage divider midpoint; regulates cathode-anode voltage when current flows into this pin |
| Pin 2 | k (cathode) | Current sink output - carries regulated load current; connects to SMPS secondary-side optocoupler anode or series pass transistor base |
| Pin 3 | a (anode) | Return path - ties to system ground or negative rail; completes shunt current path through external resistive network |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.5 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage references in multi-rail systems |
| A-Grade reference tolerance | ±1 % at 25 °C - reduces output voltage error budget in precision 5 V, 12 V, or 24 V SMPS designs |
| Mirrored pinning configuration | REF–k–a (Pin 1–2–3) - enables PCB layout compatibility with TL431xMSDT variants and avoids routing conflicts in dense feedback traces |
| AEC-Q100 Grade 1 qualification | Rated for –40 °C to +125 °C ambient - validated for automotive body electronics, infotainment power rails, and ADAS subsystems |
| Low output noise & impedance | 0.2 Ω dynamic impedance, low µV RMS noise - minimizes feedback loop jitter and improves transient response in closed-loop regulation |
Applications
| Isolated SMPS Feedback | Precision Shunt Regulator |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler-coupled feedback to primary controller. IC Role / Device Role / Timing Role: Adjustable shunt reference controlling optocoupler LED current to modulate primary-side duty cycle. Use Value: Enables ±1 % output regulation across line/load/temperature while maintaining galvanic isolation per IEC 62368-1. |
Use Scenario: Low-cost, high-accuracy replacement for Zener diodes in 3.3 V or 5 V local regulation on microcontroller power domains. IC Role / Device Role / Timing Role: Precision voltage reference and current sink stabilizing output voltage via resistive divider and bypass capacitor. Use Value: Delivers lower temperature drift and sharper knee than 5 % Zeners, improving ADC reference stability and analog sensor biasing. |
| Precision Constant Current Sink | Automotive On-Board Charger Monitor |
Use Scenario: LED driver or battery charge current limiter using single resistor to set sink current independent of supply variation. IC Role / Device Role / Timing Role: Fixed-reference-controlled current sink where cathode current equals Vref / Rsense. Use Value: Achieves <±2 % current accuracy over –40 °C to +125 °C without trimming, supporting Class D audio bias or EVSE status indicators. |
Use Scenario: Voltage monitoring in 12 V automotive charging circuits for battery state-of-charge estimation and overvoltage protection. IC Role / Device Role / Timing Role: High-temp-stable reference feeding comparator or MCU ADC to detect >14.8 V or <11.5 V thresholds. Use Value: AEC-Q100 qualification and 34 mV max ΔVref ensure reliable trip-point detection despite engine cranking transients and under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Normal pinning (k–REF–a); same A-grade tolerance and 0 °C to +70 °C rating | Limited to commercial-temperature applications; unsuitable for under-hood use | Select when board space allows re-routing and operating environment stays below 70 °C ambient |
| TL431BMSDT | Mirrored pinning; B-grade (±0.5 %) tolerance; identical –40 °C to +125 °C range | Higher precision reference needed for <±0.5 % output regulation in premium EV power modules | Choose when tighter reference accuracy justifies cost premium and layout remains unchanged |
Compared with TL431AMSDT,215, TL431ACDBZR requires PCB redesign due to pinout mismatch and lacks automotive temperature support, while TL431BMSDT offers superior reference accuracy but at higher unit cost and with no improvement in thermal impedance or EMI behavior.
Availability
TL431AMSDT,215 is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS feedback, and precision current limiting applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431AMSDT,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 leader in discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.
The TL431 family is part of Nexperia's precision analog portfolio, engineered for high-reliability voltage reference and shunt regulation in safety-critical and thermally demanding applications.
FAQ
What is the pin configuration of TL431AMSDT,215?
The TL431AMSDT,215 uses mirrored pinning in SOT23: Pin 1 is REF, Pin 2 is cathode (k), and Pin 3 is anode (a). This differs from standard TL431 variants (e.g., TL431ACDBZR) which use normal pinning (k–REF–a). Always verify PCB footprint alignment before layout integration of TL431AMSDT,215.
What temperature range does TL431AMSDT,215 support?
TL431AMSDT,215 is rated for –40 °C to +125 °C ambient operation and qualified to AEC-Q100 Grade 1 standards. Its reference voltage variation remains ≤34 mV across this full range, making it suitable for under-hood automotive modules and industrial controllers exposed to thermal cycling.
How does TL431AMSDT,215 differ from TL431FDT variants?
TL431AMSDT,215 belongs to the SDT family for standard linear applications, whereas TL431FDT offers enhanced EMI ruggedness for noisy SMPS primary-side environments. TL431AMSDT,215 has no EMI-specific hardening but provides identical A-grade tolerance and temperature range - select TL431AMSDT,215 for secondary-side feedback where noise coupling is minimal.
What is the minimum cathode current required for regulation in TL431AMSDT,215?
The TL431AMSDT,215 requires a minimum cathode current (IK(min)) of 0.4 mA at 25 °C and up to 0.6 mA across –40 °C to +125 °C to maintain regulation. This ensures stable operation even with high-value feedback resistors or low-power optocouplers in TL431AMSDT,215-based feedback networks.
Is TL431AMSDT,215 RoHS and REACH compliant?
Yes, TL431AMSDT,215 is manufactured by Nexperia in compliance with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full material declarations and substance compliance reports are available upon request from Aetrix Electronics for TL431AMSDT,215 procurement.
TL431AMSDT,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- SOT-23 (TO-236AB)
TL431AMSDT,215 FAQ
1.How can I place an order for TL431AMSDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AMSDT,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 TL431AMSDT,215 reliable?
The price and inventory of TL431AMSDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AMSDT,215 is usually 5 days.
3.What payment methods are accepted for TL431AMSDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AMSDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AMSDT,215?
TL431AMSDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AMSDT,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 TL431AMSDT,215?
For technical support, including TL431AMSDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AMSDT,215 requirements.
6.How does Aetrix verify that TL431AMSDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431AMSDT,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 TL431AMSDT,215 meets industry standards.
7.What is the process for return or replacement of TL431AMSDT,215?
All TL431AMSDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AMSDT,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 TL431AMSDT,215 part is unused and in its original packaging.
Return procedure for TL431AMSDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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