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NXP Semiconductors TL431ASDT,215
- Part No.:
- TL431ASDT,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431ASDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,104
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Product details
Overview
TL431ASDT,215 from Nexperia is an A-grade (1 % reference voltage tolerance), adjustable precision shunt regulator in SOT23 package, operating from 40 °C to +125 °C ambient, with 2.470–2.520 V reference voltage at 10 mA cathode current and 0.2 Ω typical dynamic cathode-anode impedance - used for isolated feedback loops in automotive-grade SMPS designs.
For engineers reviewing the TL431ASDT,215 datasheet, TL431ASDT,215 pinout, TL431ASDT,215 application, or TL431ASDT,215 equivalent, key selection criteria include its 1 % Vref accuracy over −40 °C to +125 °C, EMI-robustness for power supply feedback, sink current capability up to 100 mA, and AEC-Q100 Grade 1 qualification for automotive systems.
Technical Context
The TL431ASDT,215 implements a three-terminal shunt regulator architecture with internal bandgap reference, error amplifier, and NPN output stage. It functions as a programmable voltage-controlled current sink where the REF pin senses a resistor-divider voltage, and the cathode-anode path conducts current to maintain VREF = 2.495 V (typ) when VKA ≥ VREF.
Designed for standard linear applications per family documentation, TL431ASDT,215 uses normal pinning (Pin 1 = cathode, Pin 2 = REF, Pin 3 = anode) and exhibits 1.4–2.7 mV/V reference voltage variation versus cathode-anode voltage change - critical for stable regulation across wide input ranges in isolated DC-DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF tolerance | ±1 % (2.470–2.520 V at 10 mA, 25 °C) - enables tighter output voltage regulation than standard-grade TL431xSDT variants. |
| Operating temperature | −40 °C to +125 °C - qualified for under-hood automotive and industrial power supply environments. |
| Cathode current range | 1–100 mA - supports direct use in medium-power shunt regulation without external amplification. |
| Dynamic impedance | 0.2 Ω (typ) at 1–100 mA - ensures low output impedance for stable loop response in feedback networks. |
| Reference drift | ≤34 mV over −40 °C to +125 °C - maintains accuracy across full automotive temperature range. |
| EMI ruggedness | Standard-level (not enhanced like TL431xFDT) - suitable for linear regulators and non-noisy SMPS feedback paths. |
| AEC-Q100 grade | Grade 1 (−40 °C to +125 °C) - certified for automotive powertrain and body electronics applications. |
Pinout & Package
SOT23 plastic surface-mounted package (TO-236AB), 3-pin, 1.9 mm × 1.1 mm × 1.0 mm body, standard footprint per Figure 39 and reflow/wave soldering guidelines in Figures 40–41.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | K | Current-sink output terminal; connects to regulated rail or optocoupler LED anode in isolated SMPS feedback. |
| Pin 2 (Reference) | REF | High-impedance sensing input; monitors resistor divider voltage to control cathode conduction. |
| Pin 3 (Anode) | A | Return path for cathode current; tied to system ground or low-side reference point in shunt configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | Adjustable from 2.5 V to 36 V using two external resistors - replaces discrete Zener + transistor combinations in compact designs. |
| Low output noise & impedance | 0.2 Ω typical ZKA and low noise enable clean feedback signals in sensitive analog control loops. |
| Stable operation with capacitive loads | Validated stable up to 100 nF load capacitance at VKA ≥ 5 V - simplifies compensation in optocoupler-coupled feedback paths. |
| High sink current capability | 100 mA max cathode current - drives optocouplers directly or supports higher-power shunt regulation without buffer transistors. |
| Automotive qualification | AEC-Q100 Grade 1 - meets reliability and stress-test requirements for automotive power management ICs. |
Applications
| Automotive SMPS Feedback | Industrial Linear Regulator |
|---|---|
|
Use Scenario: Isolated secondary-side voltage sensing in 12 V/48 V automotive DC-DC converters with optocoupler coupling. IC Role / Device Role / Timing Role: Precision shunt regulator setting feedback threshold for TL431ASDT,215-based error amplifier driving optocoupler LED. Use Value: 1 % VREF tolerance ensures ±1.5 % output voltage accuracy over temperature, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Adjustable 5–24 V local bias rail generation in PLC I/O modules with thermal derating constraints. IC Role / Device Role / Timing Role: TL431ASDT,215 acts as programmable shunt element in series-pass regulator topology with external PNP transistor. Use Value: −40 °C to +125 °C operation and 34 mV VREF drift allow stable regulation without recalibration across industrial ambient extremes. |
| Precision Current Sink | Overvoltage Protection Clamp |
|
Use Scenario: Constant-current charging of supercapacitors in energy-harvesting sensor nodes. IC Role / Device Role / Timing Role: TL431ASDT,215 configures as precision current sink via single resistor between cathode and supply rail. Use Value: 0.2 Ω dynamic impedance and 100 mA sink capacity deliver <1 % current error across 3–30 V input range. |
Use Scenario: Secondary-rail overvoltage clamp in telecom power supplies protecting downstream FPGAs and ADCs. IC Role / Device Role / Timing Role: TL431ASDT,215 triggers crowbar action by sinking excess current when sensed voltage exceeds set threshold. Use Value: Sharp turn-on characteristic and 1.4 mV/V VREF vs. VKA sensitivity enable fast, repeatable clamping at ±0.5 % threshold accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Same 1 % VREF tolerance but rated for 0 °C to +70 °C only; SOT23 package; identical pinout. | Limited to commercial-temperature applications (e.g., consumer adapters); not AEC-Q100 qualified. | Select TL431ACDBZR only for cost-sensitive non-automotive designs where extended temperature range is unnecessary. |
| TL431BSDT | 0.5 % VREF tolerance (2.483–2.507 V); same −40 °C to +125 °C rating and AEC-Q100 Grade 1 qualification. | Higher-precision requirement (e.g., lab-grade instrumentation power supplies); tighter thermal drift spec. | Choose TL431BSDT when ±0.5 % output regulation is mandatory and board space allows same SOT23 footprint. |
Compared with TL431ACDBZR, TL431ASDT,215 adds automotive temperature range and AEC-Q100 qualification without changing pinout or circuit design; compared with TL431BSDT, it trades 0.5 % VREF accuracy for lower unit cost while retaining full automotive suitability.
Availability
TL431ASDT,215 is available at Aetrix Electronics and suitable for automotive power conversion, industrial linear regulation, and precision current sink applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431ASDT,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 high-performance discrete, logic, and PowerMOS semiconductors, spun off from NXP in 2017 and focused on automotive, industrial, computing, and consumer markets.
TL431ASDT,215 belongs to Nexperia's precision analog shunt regulator product line, engineered for robust, accurate voltage reference and current regulation in safety-critical automotive and harsh-environment industrial systems.
FAQ
What is the reference voltage tolerance and temperature range for TL431ASDT,215?
The TL431ASDT,215 features a ±1 % reference voltage tolerance (2.470–2.520 V at 25 °C, 10 mA) and is specified for operation from −40 °C to +125 °C ambient temperature - meeting AEC-Q100 Grade 1 requirements for automotive under-hood applications.
Does TL431ASDT,215 support isolated feedback in switch-mode power supplies?
Yes, TL431ASDT,215 is explicitly designed for isolated feedback loops in SMPS applications. Its stable operation with optocoupler interfaces, low dynamic impedance (0.2 Ω), and 1 % VREF accuracy make TL431ASDT,215 ideal for secondary-side voltage regulation in automotive and industrial DC-DC converters.
What is the pin configuration and package type of TL431ASDT,215?
TL431ASDT,215 uses the standard SOT23 (TO-236AB) package with normal pinning: Pin 1 = Cathode (K), Pin 2 = Reference (REF), Pin 3 = Anode (A). This matches industry-standard TL431 footprints and enables drop-in compatibility with existing layouts.
How does TL431ASDT,215 differ from TL431FDT and TL431SDT variants?
TL431ASDT,215 is an A-grade (1 %) device for standard linear applications, whereas TL431FDT offers enhanced EMI ruggedness for noisy SMPS environments, and TL431SDT is the base 2 % variant. All share SOT23 packaging and normal pinning, but TL431ASDT,215 provides tighter accuracy without EMI-specific circuitry.
Is TL431ASDT,215 qualified for automotive applications?
Yes, TL431ASDT,215 is AEC-Q100 qualified Grade 1 (−40 °C to +125 °C) and manufactured by Nexperia for automotive power management systems - including engine control units, ADAS power rails, and body electronics where reliability and thermal stability are critical.
TL431ASDT,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)
TL431ASDT,215 FAQ
1.How can I place an order for TL431ASDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ASDT,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 TL431ASDT,215 reliable?
The price and inventory of TL431ASDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ASDT,215 is usually 5 days.
3.What payment methods are accepted for TL431ASDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ASDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ASDT,215?
TL431ASDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ASDT,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 TL431ASDT,215?
For technical support, including TL431ASDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ASDT,215 requirements.
6.How does Aetrix verify that TL431ASDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431ASDT,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 TL431ASDT,215 meets industry standards.
7.What is the process for return or replacement of TL431ASDT,215?
All TL431ASDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431ASDT,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 TL431ASDT,215 part is unused and in its original packaging.
Return procedure for TL431ASDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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