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Nexperia USA Inc. TL431BFDT,215
- Part No.:
- TL431BFDT,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BFDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:21,096
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Product details
Overview
TL431BFDT,215 from Nexperia is a B-grade (0.5 % reference voltage tolerance), adjustable precision shunt regulator in SOT23 package, with Vref = 2.495 V (±0.012 V), cathode-anode voltage range up to 36 V, sink current capability of 1–100 mA, and specified operation from −40 °C to +125 °C. It serves as a programmable voltage reference and error amplifier in isolated SMPS feedback loops, precision current sinks, and shunt-based voltage regulation circuits.
For engineers reviewing the TL431BFDT,215 datasheet, TL431BFDT,215 pinout, TL431BFDT,215 application, or TL431BFDT,215 equivalent, this page delivers verified electrical parameters, validated SOT23 pin mapping, real-world use cases in power control and sensing, and confirmed alternative parts with documented functional trade-offs.
Technical Context
The TL431BFDT,215 implements a three-terminal shunt regulator architecture with an internal bandgap reference, error amplifier, and NPN output stage. Its reference voltage is set externally via two resistors between cathode, reference, and anode terminals, enabling precise output voltage programming from 2.495 V to 36 V.
It operates across −40 °C to +125 °C with 0.5 % initial Vref tolerance and typical temperature drift of ±9 mV over 0 °C to 70 °C. Dynamic cathode-anode impedance is 0.2 Ω (typ), supporting stable regulation under fast load transients in closed-loop SMPS designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref tolerance | ±0.5 % (2483–2507 mV at 25 °C, 10 mA cathode current) - enables high-accuracy feedback without trimming |
| VKA max | 36 V - supports regulation in wide-input industrial and telecom power rails |
| IK range | 1 mA to 100 mA - accommodates low-power biasing and high-current shunt applications |
| ZKA (dynamic) | 0.2 Ω (typ) - ensures tight regulation under dynamic load steps in feedback paths |
| Tamb range | −40 °C to +125 °C - qualified for under-hood and industrial ambient environments |
| Iref | 2–4 μA - ultra-low reference terminal current minimizes resistor-divider loading error |
| ΔVref/ΔT | ±9 mV (0 °C to 70 °C) - low thermal drift maintains accuracy across operating temperature |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), standard pinning configuration per Table 3 and Figure 27: 1.9 mm × 1.3 mm footprint, 1.1 mm height, lead pitch 0.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K (Cathode) | Current sink output node | Connects to regulated rail or SMPS optocoupler LED anode; carries full load current |
| 2 - REF (Reference) | High-impedance voltage sense input | Terminates external resistor divider; draws only 2–4 μA, minimizing divider power loss |
| 3 - A (Anode) | Return path for cathode current | Connected to system ground or low-side return; completes shunt current path |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage references |
| B-grade reference accuracy | 0.5 % initial tolerance - reduces calibration overhead in precision power supplies |
| Low dynamic impedance | 0.2 Ω typical - sustains regulation stability during rapid load changes in SMPS control loops |
| Wide temperature range | −40 °C to +125 °C operation - supports automotive under-hood and industrial edge-node deployments |
| Low reference current | 2–4 μA - enables high-resistance divider networks, reducing quiescent power in battery-sensitive systems |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in flyback or forward converters with optocoupler isolation. IC Role / Device Role / Timing Role: Error amplifier and voltage reference in closed-loop feedback path; compares output voltage against Vref and drives optocoupler LED. Use Value: Enables ±1 % output regulation across line/load/temperature with minimal external components and no secondary-side controller IC. |
Use Scenario: Constant-current biasing of LEDs or laser diodes in instrumentation and optical modules. IC Role / Device Role / Timing Role: Shunt-based current regulator where REF senses voltage across sense resistor, and K sinks precise current. Use Value: Delivers 0.5 % current accuracy over −40 °C to +125 °C without active op-amp circuitry or trimming. |
| Adjustable Shunt Regulator | Single-Supply Comparator |
|
Use Scenario: Local voltage regulation for microcontrollers or sensors in distributed power architectures. IC Role / Device Role / Timing Role: Three-terminal shunt regulator replacing Zener diodes; sets output voltage via R1/R2 divider from cathode to anode. Use Value: Provides sharp turn-on and 0.2 Ω dynamic impedance, 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 element in comparator input network; sets temperature-compensated switching threshold. Use Value: Leverages 9 mV typical drift over 0–70 °C to maintain accurate trip points without external compensation. |
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,215 | 1.0 % Vref tolerance (2470–2520 mV); same SOT23 package and pinout | Lower accuracy acceptable in cost-sensitive industrial supplies where ±1 % output regulation suffices | Select when tighter thermal drift spec is unnecessary and BOM cost reduction is prioritized |
| TL431CFDT,215 | 2.0 % Vref tolerance (2440–2550 mV); identical package and operating range | Suitable for non-critical biasing or coarse voltage clamping where absolute accuracy is secondary | Choose for legacy designs or auxiliary rails where calibration margin accommodates wider Vref spread |
Compared with TL431AFDT,215 and TL431CFDT,215, the TL431BFDT,215 provides 2× and 4× tighter Vref tolerance respectively-directly translating to improved output regulation accuracy in SMPS feedback and current-sink applications without added compensation circuitry.
Availability
TL431BFDT,215 is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, and adjustable shunt regulation requiring stable component supply across automotive, industrial, and telecom power designs.
Supply support for TL431BFDT,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 manufacturer headquartered in Nijmegen, Netherlands, specializing in high-volume logic, analog, and discrete devices with emphasis on reliability and energy efficiency.
The TL431 family belongs to Nexperia's precision analog portfolio, designed specifically for voltage reference, shunt regulation, and feedback control in power conversion and sensing applications demanding high accuracy and thermal stability.
FAQ
What is the maximum cathode-anode voltage for TL431BFDT,215?
The absolute maximum cathode-anode voltage (VKA) is 37 V per IEC 60134 limiting values. The recommended operating maximum is 36 V, which defines the upper bound of programmable output voltage when used as a shunt regulator. Exceeding 36 V in normal operation risks violating safe operating area limits and degrading long-term reliability.
Does TL431BFDT,215 require external capacitors for stability?
A 100 pF capacitor is recommended directly at the REF pin to suppress high-frequency noise coupling from primary-side switching in SMPS feedback applications. No bulk capacitance is required at the cathode for basic shunt operation, but layout best practices (short traces, local decoupling) remain essential to avoid oscillation above 100 kHz.
Can TL431BFDT,215 replace a Zener diode directly?
Yes-it functions as a 2.495 V Zener with programmable breakdown voltage up to 36 V, offering superior characteristics: sharper knee, lower dynamic impedance (0.2 Ω vs. >10 Ω for typical Zeners), and guaranteed 0.5 % reference tolerance. Pin-compatible replacement requires matching SOT23 orientation and verifying cathode/anode/ref connections per standard pinning.
Is TL431BFDT,215 qualified for automotive use?
No-per Revision History v.8 (20250903), TL431BFDT,215 was removed from AEC-Q100 qualification status and is not intended for automotive applications. For qualified alternatives, consider TL431BQDBZR (AEC-Q100 Grade 1, −40 °C to +125 °C) with identical electrical specs but automotive-tested packaging and screening.
TL431BFDT,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:
- ±0.5%
- 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
TL431BFDT,215 FAQ
1.How can I place an order for TL431BFDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BFDT,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 TL431BFDT,215 reliable?
The price and inventory of TL431BFDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BFDT,215 is usually 5 days.
3.What payment methods are accepted for TL431BFDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BFDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BFDT,215?
TL431BFDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BFDT,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 TL431BFDT,215?
For technical support, including TL431BFDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BFDT,215 requirements.
6.How does Aetrix verify that TL431BFDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431BFDT,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 TL431BFDT,215 meets industry standards.
7.What is the process for return or replacement of TL431BFDT,215?
All TL431BFDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BFDT,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 TL431BFDT,215 part is unused and in its original packaging.
Return procedure for TL431BFDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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