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NXP Semiconductors TL431BSDT,215
- Part No.:
- TL431BSDT,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BSDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,356
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Product details
Overview
TL431BSDT,215 from Nexperia is a B-grade (0.5 % reference voltage tolerance), adjustable precision shunt regulator in SOT23 package, operating from −40 °C to +125 °C, with 2.483 V to 2.507 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 TL431BSDT,215 datasheet, TL431BSDT,215 pinout, TL431BSDT,215 application, or TL431BSDT,215 equivalent, key selection criteria include reference voltage accuracy (0.5 %), extended temperature range (−40 °C to +125 °C), EMI ruggedness for power supply feedback, and SOT23 footprint compatibility with legacy TL431 designs.
Technical Context
The TL431BSDT,215 implements a three-terminal shunt regulator architecture with an internal 2.495 V bandgap reference, error amplifier, and NPN output stage. It operates as a programmable voltage-controlled current sink where the REF pin senses a resistor divider between cathode and anode, enabling precise regulation from Vref up to 36 V.
This variant belongs to the TL431xSDT series designed for standard linear and isolated feedback applications. It features normal pinning (Pin 1 = cathode, Pin 2 = REF, Pin 3 = anode), AEC-Q100 Grade 1 qualification, and enhanced stability with low load capacitance requirements - distinguishing it from MFDT (mirrored pinning) or FDT (EMI-rugged) variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (Vref) | 2.483 V to 2.507 V at 10 mA cathode current - enables ±0.5 % output regulation accuracy in adjustable power supplies. |
| Temperature Range | −40 °C to +125 °C - qualified for under-hood automotive and industrial environments without derating. |
| Cathode Current Range | 1 mA to 100 mA - supports direct shunt regulation or drives optocoupler LEDs in isolated SMPS feedback paths. |
| Dynamic Impedance (ZKA) | 0.2 Ω typical (f < 1 kHz) - ensures stable loop response and low output noise in closed-loop regulation. |
| Reference Current (Iref) | 2 µA to 4 µA - minimizes divider network power loss while maintaining accurate sensing at REF pin. |
| Output Voltage Range | Programmable from 2.5 V to 36 V via external resistors - replaces discrete Zener diodes in wide-range voltage references. |
| AEC-Q100 Qualification | Grade 1 (−40 °C to +125 °C) - validated for automotive powertrain and body electronics applications. |
Pinout & Package
SOT23 plastic surface-mounted package (TO-236AB), 3-pin, 1.3 mm × 2.9 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 anode; sinks up to 100 mA to maintain REF voltage at 2.495 V. |
| Pin 2 (REF) | Reference input | Senses voltage divider between cathode and anode; regulates when voltage equals internal 2.495 V reference. |
| Pin 3 (Anode, a) | Return path / ground reference | Completes current path; must be tied to system ground or return node of feedback divider. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5 % reference voltage tolerance | Enables high-accuracy output regulation (e.g., ±12.5 mV at 2.5 V) without calibration in production systems. |
| −40 °C to +125 °C operation | Supports automotive under-hood placement and industrial control cabinets without thermal derating. |
| 0.2 Ω dynamic cathode-anode impedance | Provides sharp turn-on and low-noise regulation, critical for stable feedback in isolated DC-DC converters. |
| 2 µA to 4 µA reference current | Allows use of high-value feedback resistors (e.g., 100 kΩ/10 kΩ), reducing power consumption in battery-powered systems. |
| AEC-Q100 Grade 1 qualification | Validates reliability for automotive safety-critical subsystems including ADAS power rails and engine control modules. |
Applications
| Shunt Regulator | Precision Current Limiter |
|---|---|
|
Use Scenario: Stabilizing 5 V or 3.3 V auxiliary rails in automotive infotainment head units using a simple two-resistor divider. IC Role / Device Role / Timing Role: Acts as voltage-controlled current sink to clamp cathode voltage at programmed level by shunting excess current to ground. Use Value: Replaces Zener diodes with tighter tolerance (0.5 % vs. 5 %), lower temperature drift (6 mV over 0–70 °C), and higher sink capability (100 mA). |
Use Scenario: Limiting charging current to 200 mA in a 12 V lead-acid battery backup circuit for industrial PLC I/O modules. IC Role / Device Role / Timing Role: Configured as constant-current sink with fixed resistor on REF-to-anode path, delivering precise current independent of input voltage variation. Use Value: Achieves ±1 mA current accuracy across −40 °C to +125 °C without trimming, eliminating need for op-amp-based current sources. |
| Isolated Feedback Loop | Precision Constant Current Sink |
|
Use Scenario: Providing primary-side voltage feedback in a 24 V → 5 V flyback converter for commercial HVAC controllers. IC Role / Device Role / Timing Role: Drives PC817 optocoupler LED from secondary side; regulates primary PWM duty cycle via TL431BSDT,215's cathode current modulation. Use Value: Enables <1 % output voltage regulation over line/load/temperature with AEC-Q100-compliant isolation barrier performance. |
Use Scenario: Biasing laser diodes in fiber-optic transceivers requiring stable 80 mA bias current with <±0.5 % drift over temperature. IC Role / Device Role / Timing Role: Functions as grounded current sink with anode at system ground and cathode connected to laser cathode through sense resistor. Use Value: Delivers 80 mA ±0.4 mA accuracy (0.5 %) from −40 °C to +125 °C, eliminating need for external current-sense amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | 1 % reference tolerance, 0 °C to +70 °C temp range, same SOT23 package and pinout | Commercial-grade only; unsuitable for automotive or extended-temperature industrial use | Select when cost sensitivity outweighs temperature range and accuracy requirements |
| TL431BIDBZR | 0.5 % reference tolerance, −40 °C to +85 °C temp range, same SOT23 package and pinout | Limited to industrial control panels without under-hood exposure | Choose for cost-optimized industrial designs where +125 °C operation is unnecessary |
Compared with TL431ACDBZR and TL431BIDBZR, TL431BSDT,215 provides the widest operating temperature range (−40 °C to +125 °C) while retaining 0.5 % reference accuracy - making it the only option qualified for full automotive Grade 1 deployment without design compromise.
Availability
TL431BSDT,215 is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS feedback, and precision current sink applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL431BSDT,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, with focus on automotive, industrial, computing, and consumer markets.
The TL431BSDT,215 belongs to Nexperia's precision analog shunt regulator portfolio, engineered for high-reliability feedback and regulation in automotive-grade power conversion systems.
FAQ
What is the reference voltage tolerance of TL431BSDT,215?
The TL431BSDT,215 has a B-grade reference voltage tolerance of ±0.5 %, meaning its Vref is guaranteed between 2.483 V and 2.507 V at 10 mA cathode current and 25 °C ambient. This tight tolerance enables high-accuracy output regulation in automotive and industrial power supplies where calibration is impractical. The TL431BSDT,215 maintains this specification across its full −40 °C to +125 °C operating range.
Does TL431BSDT,215 support isolated feedback in SMPS designs?
Yes, TL431BSDT,215 is explicitly designed for isolated feedback loops in Switch Mode Power Supplies (SMPS). Its low dynamic impedance (0.2 Ω), sharp turn-on characteristic, and AEC-Q100 Grade 1 qualification make it ideal for driving optocouplers like PC817 in secondary-side regulation. The TL431BSDT,215 ensures stable loop response and <1 % output voltage regulation across line, load, and temperature variations.
What is the pin configuration of TL431BSDT,215?
TL431BSDT,215 uses normal pinning in SOT23 package: Pin 1 = Cathode (k), Pin 2 = REF, Pin 3 = Anode (a). This matches industry-standard TL431 footprints and allows drop-in replacement in existing designs using TL431C/TL431A variants. The TL431BSDT,215 does not use mirrored pinning (which appears in MFDT/MSDT suffixes) - confirmed in Table 3 and ordering information.
Is TL431BSDT,215 qualified for automotive applications?
Yes, TL431BSDT,215 is AEC-Q100 qualified Grade 1 (−40 °C to +125 °C), fully validated for automotive powertrain, body electronics, and ADAS subsystems. Its qualification covers stress testing per AEC-Q100 Rev G, including HTOL, TC, HAST, and ESD (4 kV HBM). The TL431BSDT,215 is documented in the official Nexperia TL431 family datasheet Rev. 5 as meeting automotive reliability requirements.
What is the maximum cathode current rating for TL431BSDT,215?
The absolute maximum cathode current for TL431BSDT,215 is 150 mA (per Table 6), but the recommended operating condition is 1 mA to 100 mA (Table 8). At 100 mA, power dissipation must be managed: on FR4 PCB with standard footprint, Ptot ≤ 350 mW; with 1 cm² anode pad, up to 580 mW is allowed. The TL431BSDT,215 delivers stable regulation across this full 1–100 mA range with <0.5 Ω effective output impedance.
TL431BSDT,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:
- ±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:
- SOT-23 (TO-236AB)
TL431BSDT,215 FAQ
1.How can I place an order for TL431BSDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BSDT,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 TL431BSDT,215 reliable?
The price and inventory of TL431BSDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BSDT,215 is usually 5 days.
3.What payment methods are accepted for TL431BSDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BSDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BSDT,215?
TL431BSDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BSDT,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 TL431BSDT,215?
For technical support, including TL431BSDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BSDT,215 requirements.
6.How does Aetrix verify that TL431BSDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431BSDT,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 TL431BSDT,215 meets industry standards.
7.What is the process for return or replacement of TL431BSDT,215?
All TL431BSDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BSDT,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 TL431BSDT,215 part is unused and in its original packaging.
Return procedure for TL431BSDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BSDT,215 Tags
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