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Nexperia USA Inc. TL431ACDBZRVL
- Part No.:
- TL431ACDBZRVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431ACDBZRVL.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,669
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Product details
Overview
TL431ACDBZR from Nexperia is an A-grade (±1.0 %) adjustable precision shunt regulator in SOT23 package, featuring 2.495 V reference voltage, 1 mA to 100 mA sink current capability, and 0.2 Ω typical dynamic cathode-anode impedance - used for isolated feedback loops in AC/DC adapters and USB PD power supplies.
For engineers reviewing the TL431ACDBZR datasheet, TL431ACDBZR pinout, TL431ACDBZR application, or TL431ACDBZR equivalent, this page delivers verified electrical parameters, SOT23 terminal mapping, real-world use cases in SMPS feedback and precision current sinking, and validated alternative parts with tolerance and temperature range differences.
Technical Context
The TL431ACDBZR implements a three-terminal shunt topology where the REF pin senses voltage via external resistor divider, triggering internal error amplifier and output transistor to regulate cathode current. Its 1.0 % reference voltage tolerance and −40 °C to +85 °C operating range support industrial-grade power management.
It operates as a programmable 2.495 V bandgap-referenced shunt: cathode-anode voltage ranges from 2.495 V to 36 V, with low 9 mV typical temperature drift over 0–70 °C and 0.2 Ω dynamic impedance enabling stable regulation under fast load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage | 2.495 V ±1.0 % at 10 mA cathode current - sets precise regulation threshold for feedback networks |
| Cathode current range | 1 mA to 100 mA - supports both low-power biasing and high-current shunt regulation |
| Dynamic impedance | 0.2 Ω typical - ensures minimal output voltage deviation during current step changes |
| Temperature range | −40 °C to +85 °C - qualified for extended industrial environments without derating |
| Output noise | Low - enables clean reference for sensitive analog circuits without added filtering |
| Reference current | 2.0–4.0 μA - defines minimum divider current needed for stable REF pin operation |
| Max cathode-anode voltage | 36 V - allows direct use in 24 V systems and flyback secondary-side applications |
Pinout & Package
SOT23-3 plastic surface-mounted package (3.0 × 1.4 × 1.1 mm), standard pinning configuration per Table 3: Pin 1 = Cathode (K), Pin 2 = Reference (REF), Pin 3 = Anode (A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K | Cathode | Main current sink node; connects to regulated output rail or SMPS optocoupler LED anode |
| 2 - REF | Reference input | High-impedance sensing node; voltage divider midpoint that triggers regulation at 2.495 V |
| 3 - A | Anode | Return path to ground or system common; completes shunt current loop |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.495 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage regulators |
| A-grade reference tolerance | ±1.0 % at 25 °C - improves output accuracy in closed-loop SMPS designs vs. standard 2 % grade |
| Low temperature drift | 9 mV over 0–70 °C - maintains regulation stability across ambient shifts without compensation |
| Sharp turn-on characteristic | Fast error amplifier response - enables reliable Zener diode replacement in on-board regulation |
| ESD robustness | 4 kV HBM - withstands handling and board-level ESD events without latch-up or parameter shift |
Applications
| AC/DC Adapter Feedback | USB-C Power Delivery |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters delivering 5–20 V output. IC Role / Device Role / Timing Role: Shunt regulator providing precise reference to optocoupler LED, closing isolation barrier feedback loop. Use Value: ±1.0 % reference tolerance reduces output voltage variation to ±1.5 % across line/load/temperature - meeting USB PD v3.1 ripple and accuracy requirements. |
Use Scenario: Programmable voltage setpoint in multi-output buck-boost controllers for variable USB-C output profiles. IC Role / Device Role / Timing Role: Adjustable shunt element setting feedback divider ratio for dynamic output voltage selection. Use Value: 0.2 Ω dynamic impedance ensures stable regulation during rapid PDO switching (<100 μs transitions), preventing output overshoot. |
| Precision Current Sink | Industrial Sensor Biasing |
|
Use Scenario: Constant-current excitation of 4–20 mA loop transmitters or RTD bridges. IC Role / Device Role / Timing Role: Precision shunt regulating current through load by maintaining fixed voltage across sense resistor. Use Value: 1.0 % reference tolerance and <9 mV tempco yield current accuracy better than ±1.2 % over −40–85 °C - exceeding IEC 61000-4-4 immunity thresholds. |
Use Scenario: Stable bias supply for analog front-end amplifiers in PLC analog input modules. IC Role / Device Role / Timing Role: Low-noise, low-drift shunt reference establishing accurate gain-setting and offset calibration points. Use Value: Low output noise and 2.495 V reference enable 16-bit ADC effective resolution without additional LDO filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | 2.0 % reference tolerance, same SOT23 package and −40 °C to +85 °C range | Acceptable for non-critical 12 V adapter feedback where ±2 % output tolerance is permitted | Select when cost sensitivity outweighs output accuracy requirements |
| TL431BCDBZR | 0.5 % reference tolerance, identical thermal and current specs | Required for medical-grade power supplies needing <±0.7 % total output error budget | Choose when tighter regulation justifies higher unit cost and longer lead times |
Compared with TL431CDBZR, TL431ACDBZR improves reference accuracy by 1.0 % absolute, reducing worst-case output error in 12 V SMPS by 120 mV; versus TL431BCDBZR, it trades 0.5 % tighter tolerance for broader availability and shorter procurement cycles while retaining full pin and thermal compatibility.
Availability
TL431ACDBZR is available at Aetrix Electronics and suitable for AC/DC adapters, USB-C power delivery systems, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for TL431ACDBZR 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 high-volume, high-reliability logic, discrete, and MOSFET solutions, with manufacturing rooted in process innovation and automotive-grade quality systems.
The TL431 family is part of Nexperia's precision analog portfolio, designed specifically for cost-sensitive yet accuracy-demanding power management functions in industrial, consumer, and computing power supplies.
FAQ
What is the maximum cathode-anode voltage for TL431ACDBZR?
The absolute maximum cathode-anode voltage is 37 V per IEC 60134 limiting values, but recommended operating conditions specify up to 36 V. Exceeding 36 V risks permanent damage even if within 37 V absolute limit, especially at elevated temperatures or with sustained current.
Can TL431ACDBZR replace a Zener diode directly?
Yes - its sharp turn-on characteristic and low dynamic impedance (0.2 Ω) allow direct substitution for Zener diodes in voltage regulation and clamping, provided external resistor divider sets desired voltage and cathode current stays within 1–100 mA range.
Is TL431ACDBZR qualified for automotive use?
No - although some TL431 variants (e.g., TL431AQDBZR) carry AEC-Q100 Grade 1 qualification, TL431ACDBZR is specified only for industrial temperature range (−40 °C to +85 °C) and lacks automotive qualification status per Revision History v.8.
How does the REF pin current affect design?
The REF pin draws 2–4 μA typical current; this must be supplied entirely by the upper resistor in the feedback divider. Designers must ensure divider current exceeds 10× REF current (i.e., >40 μA) to minimize voltage error from REF loading.
TL431ACDBZRVL 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:
- ±1%
- 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
TL431ACDBZRVL FAQ
1.How can I place an order for TL431ACDBZRVL through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACDBZRVL 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 TL431ACDBZRVL reliable?
The price and inventory of TL431ACDBZRVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACDBZRVL is usually 5 days.
3.What payment methods are accepted for TL431ACDBZRVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACDBZRVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACDBZRVL?
TL431ACDBZRVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACDBZRVL 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 TL431ACDBZRVL?
For technical support, including TL431ACDBZRVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACDBZRVL requirements.
6.How does Aetrix verify that TL431ACDBZRVL is sourced from the original manufacturer or authorized distributors?
All TL431ACDBZRVL 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 TL431ACDBZRVL meets industry standards.
7.What is the process for return or replacement of TL431ACDBZRVL?
All TL431ACDBZRVL units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACDBZRVL, 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 TL431ACDBZRVL part is unused and in its original packaging.
Return procedure for TL431ACDBZRVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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