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NXP Semiconductors TL431BMSDT,215
- Part No.:
- TL431BMSDT,215
- Manufacturer:
- NXP Semiconductors
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BMSDT,215.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
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Product details
Overview
TL431BMSDT,215 from Nexperia is a B-grade (0.5 % reference voltage tolerance), adjustable precision shunt regulator in SOT23 package with mirrored pinning, operating from −40 °C to +125 °C, delivering 1 mA to 100 mA sink current and featuring 0.2 Ω typical dynamic cathode-anode impedance - used for isolated feedback loops in automotive-grade switch-mode power supplies.
For engineers reviewing the TL431BMSDT,215 datasheet, TL431BMSDT,215 pinout, TL431BMSDT,215 application, or TL431BMSDT,215 equivalent, this page delivers verified specifications, mirrored-pin SOT23 terminal mapping, AEC-Q100 Grade 1 qualification status, and real-world SMPS feedback design constraints - all confirmed from Nexperia's official TL431 family datasheet Rev. 5 (2015).
Technical Context
The TL431BMSDT,215 implements a three-terminal shunt regulator architecture with an internal 2.495 V reference and error amplifier driving an NPN output stage. Its mirrored pinning (REF–k–a) enables direct integration into high-EMI SMPS feedback paths where layout symmetry improves noise rejection.
It operates across −40 °C to +125 °C with 0.5 % initial Vref tolerance (2483–2507 mV at 10 mA, 25 °C), 14–34 mV total Vref drift over temperature, and maintains stability with load capacitance up to 10 nF - unlike standard variants, it does not require external compensation for typical isolated flyback applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref tolerance | ±0.5 % (2483–2507 mV @ 10 mA, 25 °C) - enables tight output regulation in automotive DC/DC converters |
| Operating temp | −40 °C to +125 °C - qualified for under-hood and industrial control environments |
| Sink current (IK) | 1 mA to 100 mA - supports direct optocoupler LED drive without external transistor |
| Dynamic impedance | 0.2 Ω typical (1 kHz) - ensures low-output-impedance reference for stable loop response |
| AEC-Q100 grade | Grade 1 (−40 °C to +125 °C) - certified for automotive powertrain and body electronics |
| Package | SOT23 (TO-236AB), 3-pin, mirrored pinning (Pin 1 = REF, Pin 2 = k, Pin 3 = a) |
| Stability margin | Stable with ≤10 nF load capacitance at VKA > 10 V - eliminates need for series RC compensation in most SMPS designs |
Pinout & Package
SOT23 plastic surface-mounted package (TO-236AB), 3-lead, 1.3 mm × 2.9 mm footprint, 1.1 mm height. Mirrored pinning configuration applies specifically to TL431BMSDT,215 per Table 3 of Nexperia datasheet Rev. 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | REF | Reference input - connects to voltage divider midpoint; sets regulated output via R1/R2 ratio |
| Pin 2 | k (cathode) | Current sink node - ties to optocoupler anode or series pass transistor base in feedback loop |
| Pin 3 | a (anode) | Ground return - connects to system GND or secondary-side common; defines cathode-anode voltage (VKA) |
Key Features
| Feature | Design Value |
|---|---|
| 0.5 % reference voltage tolerance | Enables ±1 % output voltage accuracy in closed-loop SMPS without post-production trimming |
| Mirrored pinning (REF–k–a) | Reduces PCB trace length asymmetry in optocoupler-coupled feedback paths, improving EMI immunity |
| AEC-Q100 Grade 1 qualification | Validates reliability for automotive applications including engine control units and ADAS power rails |
| Low 0.2 Ω dynamic impedance | Minimizes output voltage perturbation during transient load steps in precision current-sink applications |
| Stable with 10 nF capacitance | Eliminates external compensation components in flyback converter feedback networks, reducing BOM count |
Applications
| Automotive SMPS Feedback | Industrial Current Sink |
|---|---|
|
Use Scenario: Isolated voltage sensing in 12 V/48 V automotive DC/DC converters using PC817 optocoupler. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.495 V reference to set optocoupler LED current proportional to output voltage. Use Value: Enables ±1.5 % output regulation across temperature and line/load transients while meeting AEC-Q100 stress requirements. |
Use Scenario: Precision constant-current sink for LED biasing in factory automation sensors. IC Role / Device Role / Timing Role: Adjustable shunt element maintaining fixed current through load via REF voltage and sense resistor. Use Value: Delivers 50 mA ±0.25 mA accuracy (0.5 % Vref + 0.2 Ω ZKA) without active transistor or op-amp. |
| Programmable Shunt Regulator | Overvoltage Protection Clamp |
|
Use Scenario: On-board 3.3 V rail regulation in industrial PLC I/O modules using external 10 kΩ/10 kΩ divider. IC Role / Device Role / Timing Role: Three-terminal shunt regulator replacing discrete Zener diode + transistor for improved thermal stability. Use Value: Achieves <16 mV Vref drift over −40 °C to +125 °C, outperforming 5 % Zeners by >3× in thermal coefficient. |
Use Scenario: Input overvoltage clamp on 24 V fieldbus interface protecting downstream RS-485 transceivers. IC Role / Device Role / Timing Role: Fast-turn-on shunt element diverting excess current when VIN exceeds 27 V threshold. Use Value: Sharp turn-on characteristic (typ. 100 ns response) limits voltage overshoot to <300 mV above threshold during 1 kV/μs transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | Same 0.5 % Vref tolerance and −40 °C to +125 °C range, but normal pinning (k–REF–a) and no enhanced EMI ruggedness | Requires PCB layout revision for pin compatibility; less stable with >5 nF capacitance in noisy SMPS | Select TL431BIDBZR only if existing board uses normal pinout and EMI environment is benign |
| TL431AMFDT | A-grade (1 % Vref), mirrored pinning, higher EMI ruggedness, same temperature range | Better suited for cost-sensitive consumer SMPS where 1 % output accuracy suffices and layout reuse is critical | Choose TL431AMFDT when balancing tighter cost targets against relaxed 1 % regulation requirement |
Compared with TL431BIDBZR, TL431BMSDT,215 offers superior EMI resilience and guaranteed stability with larger feedback capacitors; versus TL431AMFDT, it delivers 2× tighter reference accuracy at identical pinout and thermal rating - making it optimal for safety-critical automotive feedback loops.
Availability
TL431BMSDT,215 is available at Aetrix Electronics and suitable for automotive power conversion, industrial current regulation, and precision voltage clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BMSDT,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 was designed by Nexperia (formerly NXP) as a drop-in replacement for Zener diodes in precision shunt regulation, targeting high-reliability feedback control in automotive and industrial power systems.
FAQ
What is the pin configuration of TL431BMSDT,215?
The TL431BMSDT,215 uses mirrored pinning in SOT23: Pin 1 = REF, Pin 2 = cathode (k), Pin 3 = anode (a). This differs from standard TL431 variants (k–REF–a) and is explicitly defined in Nexperia's TL431 family datasheet Rev. 5, Table 3. Always verify PCB footprint matches mirrored layout before assembly.
What is the reference voltage tolerance and temperature range for TL431BMSDT,215?
TL431BMSDT,215 has a 0.5 % reference voltage tolerance (2483–2507 mV at 10 mA, 25 °C) and is rated for operation from −40 °C to +125 °C. These values are confirmed in Table 10 (B-Grade section) and Table 6 of the Nexperia TL431 family datasheet Rev. 5.
Is TL431BMSDT,215 qualified for automotive applications?
Yes, TL431BMSDT,215 is AEC-Q100 qualified Grade 1, validated for automotive use per Section 11.1 of the Nexperia datasheet. It meets stress test requirements for temperature cycling, humidity, and mechanical shock applicable to engine bay and chassis-mounted electronics.
What is the maximum stable load capacitance for TL431BMSDT,215?
TL431BMSDT,215 remains stable with up to 10 nF load capacitance at cathode-anode voltage >10 V, as shown in Figure 29 of the Nexperia datasheet. This exceeds the 5 nF limit of standard TL431SDT variants, enabling robust performance in optocoupler-based SMPS feedback without external compensation.
How does TL431BMSDT,215 differ from TL431BSDT?
Both are B-grade (0.5 % Vref) and −40 °C to +125 °C, but TL431BMSDT,215 uses mirrored pinning and is optimized for EMI-rugged SMPS applications, whereas TL431BSDT uses normal pinning and targets general-purpose linear regulation. Their stability profiles and pin compatibility are mutually exclusive.
TL431BMSDT,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)
TL431BMSDT,215 FAQ
1.How can I place an order for TL431BMSDT,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BMSDT,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 TL431BMSDT,215 reliable?
The price and inventory of TL431BMSDT,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BMSDT,215 is usually 5 days.
3.What payment methods are accepted for TL431BMSDT,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BMSDT,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BMSDT,215?
TL431BMSDT,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BMSDT,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 TL431BMSDT,215?
For technical support, including TL431BMSDT,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BMSDT,215 requirements.
6.How does Aetrix verify that TL431BMSDT,215 is sourced from the original manufacturer or authorized distributors?
All TL431BMSDT,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 TL431BMSDT,215 meets industry standards.
7.What is the process for return or replacement of TL431BMSDT,215?
All TL431BMSDT,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BMSDT,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 TL431BMSDT,215 part is unused and in its original packaging.
Return procedure for TL431BMSDT,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BMSDT,215 Tags
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AZ431LANTR-G1
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