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Nexperia USA Inc. TL431BCDBZRVL
- Part No.:
- TL431BCDBZRVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BCDBZRVL.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,485
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Product details
Overview
TL431BCDBZR from Nexperia is a B-grade (±0.5 %) adjustable precision shunt regulator in SOT23 package, configured with normal pinning (K-REF-A), operating from 2.495 V to 36 V output via two external resistors, with 0.2 Ω typical dynamic impedance and 1–100 mA sink current - used for isolated feedback in AC/DC SMPS designs.
For engineers reviewing the TL431BCDBZR datasheet, TL431BCDBZR pinout, TL431BCDBZR application, or TL431BCDBZR equivalent, key selection criteria include reference voltage tolerance (0.5 %), cathode-anode voltage range (2.495–36 V), thermal stability over –40 °C to 125 °C, and SOT23 footprint compatibility with board-level shunt regulation and current-sink topologies.
Technical Context
The TL431BCDBZR implements a bandgap-referenced error amplifier driving an NPN output stage, enabling precise voltage regulation through external resistor dividers. Its internal 2.495 V reference is trimmed to ±0.5 % at 25 °C and exhibits ≤16 mV drift over 0 °C to 70 °C ambient.
It operates as a 3-terminal programmable shunt: cathode sinks current when REF voltage exceeds 2.495 V, maintaining stable regulation across 1–100 mA load range. The device features low 0.2 Ω dynamic impedance and <4 μA reference input current, supporting high-loop-gain feedback in isolated power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage | 2483–2507 mV at 10 mA cathode current; enables precise 2.495 V setpoint with minimal trim dependency |
| Voltage tolerance | ±0.5 % (B-grade); ensures tight output accuracy without calibration in production power supplies |
| Cathode-anode voltage | 2.495 V to 36 V; supports wide-range output programming for 5 V, 12 V, 24 V, and 36 V SMPS rails |
| Sink current range | 1 mA to 100 mA; accommodates both light-load biasing and full-load regulation in flyback controllers |
| Dynamic impedance | 0.2 Ω typical; provides low-noise, high-stiffness regulation critical for stable closed-loop feedback |
| Temp range | –40 °C to +125 °C; qualified for industrial and extended-temperature embedded power applications |
| Output noise | Low (not quantified numerically but specified as "low output noise" in features); reduces ripple injection into feedback path |
Pinout & Package
SOT23-3 plastic surface-mounted package (3.0 × 1.4 × 1.1 mm), standard footprint per Fig. 28 (reflow) and Fig. 29 (wave), with normal pinning configuration (K-REF-A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Sinks regulated current to ground or return rail; connects to SMPS optocoupler anode or series pass transistor base |
| 2 (REF) | Reference input | High-impedance (≤4 μA) node sensing divided output voltage; determines regulation threshold |
| 3 (A) | Anode | Return path for cathode current; tied to system ground or low-side return in shunt topology |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | Set from 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage regulators |
| B-grade reference tolerance | ±0.5 % at 25 °C - enables single-resistor trimming or zero-trim designs in cost-sensitive power modules |
| Low dynamic impedance | 0.2 Ω typical - maintains regulation stability under fast load transients in SMPS feedback loops |
| Sharp turn-on characteristic | Active output stage with fast response - replaces Zener diodes with superior thermal stability and lower knee impedance |
| Extended temperature operation | –40 °C to +125 °C - supports industrial motor drives, telecom power, and automotive non-safety-critical subsystems |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
Use Scenario: Primary-side voltage regulation in flyback or forward converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator on secondary side, setting reference for optocoupler LED current proportional to output voltage. Use Value: Enables ±0.5 % output regulation accuracy across line/load/temperature, reducing need for post-regulation LDOs. | Use Scenario: Constant-current biasing of laser diodes or LED strings in instrumentation lighting. IC Role / Device Role / Timing Role: Adjustable shunt element sinking precise current determined by REF resistor divider and cathode load. Use Value: Delivers stable 1–100 mA sink with <16 mV reference drift, eliminating discrete transistor current mirror complexity. |
| Adjustable Shunt Regulator | Single-Supply Comparator |
Use Scenario: On-board 3.3 V or 5 V rail regulation where space prohibits linear regulators or switching ICs. IC Role / Device Role / Timing Role: Three-terminal shunt providing programmable voltage clamp with external R1/R2 divider. Use Value: Replaces Zener diodes with tighter tolerance, lower impedance, and better thermal stability in compact PCB layouts. | Use Scenario: Threshold detection in battery monitoring or overvoltage protection circuits with temperature-compensated trip point. IC Role / Device Role / Timing Role: Precision reference comparator with built-in 2.495 V bandgap threshold and open-collector output behavior. Use Value: Provides stable trip point independent of supply variation - no external reference IC required for basic voltage supervision. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | ±1.0 % reference tolerance; 0 °C to 70 °C temp range; same SOT23 normal pinning | Lower accuracy and narrower temperature range - suitable for commercial-grade consumer power supplies | Select when ±1 % tolerance and 70 °C max ambient meet design requirements and cost is prioritized |
| TL431CDBZR | ±2.0 % reference tolerance; 0 °C to 70 °C temp range; same SOT23 normal pinning | Loosest tolerance and narrowest temp range - appropriate for non-critical biasing or legacy designs | Choose only for cost-sensitive, non-precision applications where calibration or margining compensates for tolerance |
Compared with TL431ACDBZR and TL431CDBZR, the TL431BCDBZR delivers twice the accuracy of A-grade and four times that of standard grade, while extending operational range to 125 °C - making it optimal for industrial power supplies requiring long-term stability without recalibration.
Availability
TL431BCDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, adjustable shunt regulation, and single-supply voltage supervision requiring stable component supply across industrial temperature grades.
Supply support for TL431BCDBZR 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 expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for power management, analog, and interface applications.
The TL431 family belongs to Nexperia's precision analog portfolio, designed specifically for voltage reference and shunt regulation in cost-sensitive, space-constrained power systems - emphasizing accuracy, thermal stability, and SMT manufacturability.
FAQ
What is the correct pinout configuration for TL431BCDBZR?
The TL431BCDBZR uses normal pinning in SOT23-3: Pin 1 = Cathode (K), Pin 2 = Reference (REF), Pin 3 = Anode (A). This matches the standard TL431 pinout and differs from mirrored variants ending in MFDT. Always verify against marking code CG% on the device body.
Can TL431BCDBZR replace a Zener diode directly?
Yes - TL431BCDBZR can directly replace Zener diodes in shunt regulation roles, offering superior performance: ±0.5 % reference accuracy vs. ±5–10 % for Zeners, 0.2 Ω dynamic impedance vs. >10 Ω, and sharp turn-on characteristics. External resistor divider sets output voltage; no additional components needed beyond the two resistors.
What is the minimum cathode current required for regulation?
The TL431BCDBZR requires ≥0.4 mA minimum cathode current (IK(min)) to maintain regulation across its full temperature range (–40 °C to +125 °C). At room temperature, regulation is stable down to 0.2 mA, but designs must ensure ≥0.4 mA under worst-case conditions to guarantee accuracy and stability.
Is TL431BCDBZR qualified for automotive use?
No - although earlier revisions included AEC-Q100 qualification for some variants, Revision 8 (2025) explicitly states that TL431BCDBZR and other DBZR/FDT/MFDT types have removed automotive qualification status and are not intended for automotive applications. Use only in industrial, computing, or consumer power systems.
TL431BCDBZRVL 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TL431BCDBZRVL FAQ
1.How can I place an order for TL431BCDBZRVL through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BCDBZRVL 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 TL431BCDBZRVL reliable?
The price and inventory of TL431BCDBZRVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BCDBZRVL is usually 5 days.
3.What payment methods are accepted for TL431BCDBZRVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BCDBZRVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BCDBZRVL?
TL431BCDBZRVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BCDBZRVL 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 TL431BCDBZRVL?
For technical support, including TL431BCDBZRVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BCDBZRVL requirements.
6.How does Aetrix verify that TL431BCDBZRVL is sourced from the original manufacturer or authorized distributors?
All TL431BCDBZRVL 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 TL431BCDBZRVL meets industry standards.
7.What is the process for return or replacement of TL431BCDBZRVL?
All TL431BCDBZRVL units undergo pre-shipment inspection (PSI). If there is an issue with TL431BCDBZRVL, 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 TL431BCDBZRVL part is unused and in its original packaging.
Return procedure for TL431BCDBZRVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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