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Nexperia USA Inc. TL431AQDBZRVL
- Part No.:
- TL431AQDBZRVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431AQDBZRVL.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,008
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Product details
Overview
TL431AQDBZR from Nexperia is an A-grade (±1.0 %) adjustable precision shunt regulator in SOT23 package, configured with normal pinning (K-REF-A), operating across –40 °C to 125 °C, delivering 2.470 V to 2.520 V reference voltage at 10 mA cathode current, and supporting programmable output voltages up to 36 V in isolated SMPS feedback loops.
For engineers reviewing the TL431AQDBZR datasheet, TL431AQDBZR pinout, TL431AQDBZR application, or TL431AQDBZR equivalent, this page delivers verified thermal stability (±34 mV over –40 °C to 125 °C), dynamic impedance (0.2 Ω), sink current range (1–100 mA), and AEC-Q100 Grade 1 qualification status per Rev. 8 (2025) documentation.
Technical Context
The TL431AQDBZR 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-to-anode voltage. Its architecture enables precise voltage setpoint control without requiring external op-amps or comparators.
It operates as a two-quadrant device: sinking current when VKA exceeds Vref, and entering high-impedance off-state below threshold. With typical output impedance of 0.2 Ω and reference current under 4 μA, it maintains regulation stability even under light-load or high-frequency transient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (Vref) | 2.470 V to 2.520 V at 10 mA, IK = 10 mA, Tamb = 25 °C - defines minimum stable regulation threshold for external resistor network design |
| Reference tolerance | ±1.0 % (A-Grade) - enables tighter output voltage accuracy than standard-grade (±2.0 %) variants in power supply feedback paths |
| Cathode current range | 1 mA to 100 mA - supports direct replacement of Zener diodes in low-to-moderate power shunt applications |
| Dynamic cathode-anode impedance | 0.2 Ω typical (f < 1 kHz) - ensures minimal regulation error during load transients in SMPS secondary-side control |
| Temperature range | –40 °C to +125 °C - qualified for under-hood automotive and industrial environments requiring extended thermal robustness |
| Reference current (Iref) | 2.0 μA to 4.0 μA - ultra-low input bias enables high-resistance feedback dividers without significant voltage division error |
| Output voltage range | 2.495 V to 36 V - set externally by R1/R2; allows single-part flexibility across multiple output rails |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.3 mm footprint, 1.1 mm height, with standard JEDEC outline and reflow-compatible solder pads per Figure 28.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K (Cathode) | Current sink terminal | Connects to regulated output node; carries full load-sink current; must be routed with low-inductance path for stability |
| 2 - REF (Reference) | High-impedance sense input | Connects to resistor divider midpoint; draws ≤4 μA; requires local 100 pF capacitor to suppress noise coupling in SMPS applications |
| 3 - A (Anode) | Return path / ground reference | Typically tied to system ground or negative rail; establishes reference potential for internal error amplifier; not floating |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage regulators |
| A-Grade reference accuracy | ±1.0 % tolerance over full temperature range - reduces output voltage drift in precision DC-DC converters |
| Low dynamic impedance | 0.2 Ω typical - minimizes output voltage deviation during fast load steps in battery-powered or isolated supplies |
| Wide operating temperature | –40 °C to +125 °C - supports automotive engine-control units and industrial motor drives without derating |
| ESD robustness | 4 kV HBM - withstands handling and board-level ESD events without latch-up or parameter shift |
Applications
| Isolated SMPS Feedback | Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt regulator providing stable reference to drive optocoupler LED; regulates output by modulating primary-side controller via feedback signal. Use Value: Enables ±1 % output regulation across line/load/temperature with <100 pF compensation on REF pin, reducing component count vs. discrete op-amp solutions. |
Use Scenario: Constant-current source for LED biasing or sensor excitation in analog front-ends. IC Role / Device Role / Timing Role: Precision shunt element setting current through external sense resistor; sinks exact current determined by Vref and Rsense. Use Value: Delivers 1 % current accuracy from 1 mA to 100 mA without active current mirror or op-amp, minimizing thermal drift and PCB area. |
| Programmable Voltage Monitor | On-Board Linear Regulator |
Use Scenario: Overvoltage protection circuit triggering shutdown when input exceeds user-defined threshold. IC Role / Device Role / Timing Role: Comparator substitute with temperature-compensated reference; REF pin biased to trip point; cathode drives MOSFET gate or enable pin. Use Value: Provides stable 2.495–36 V threshold with <34 mV total variation over –40 °C to +125 °C, eliminating need for external bandgap reference. |
Use Scenario: Low-cost, low-power auxiliary rail generation (e.g., 5 V or 3.3 V) from higher intermediate bus in embedded systems. IC Role / Device Role / Timing Role: Shunt regulator dissipating excess power as heat; anode grounded, cathode connected to unregulated input, REF tied to resistor divider. Use Value: Supports up to 100 mA load with <0.2 Ω effective output impedance, enabling stable regulation without LDO-level quiescent current overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | Same A-grade tolerance (±1.0 %) but rated for 0 °C to 70 °C only | Limited to commercial-temperature consumer or office equipment; not suitable for under-hood or industrial ambient | Select when cost sensitivity outweighs extended temperature requirement and ambient stays within 0–70 °C |
| TL431BQDBZR | B-grade (±0.5 %) tolerance, same –40 °C to +125 °C rating, identical SOT23 normal pinning | Higher accuracy needed for metrology-grade references or high-end server VRMs | Choose when tighter regulation (±0.5 %) justifies marginal cost increase and thermal profile matches |
Compared with TL431AQDBZR, TL431ACDBZR trades temperature range for lower cost in benign environments, while TL431BQDBZR offers superior accuracy at identical thermal capability-making TL431AQDBZR the optimal balance of precision, ruggedness, and value for automotive and industrial power management.
Availability
TL431AQDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, and programmable voltage monitoring requiring stable component supply across automotive, industrial, and telecom power systems.
Supply support for TL431AQDBZR 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 power MOSFET solutions, with manufacturing rooted in process innovation and automotive-grade quality systems.
TL431AQDBZR belongs to Nexperia's precision analog shunt regulator product line, engineered specifically for robust, low-drift voltage reference and current regulation in safety-critical and thermally demanding power conversion applications.
FAQ
What is the maximum cathode-anode voltage for TL431AQDBZR?
The absolute maximum cathode-anode voltage (VKA) is 37 V per IEC 60134 limiting values. The recommended operating range extends from Vref (minimum 2.47 V) up to 36 V. Exceeding 37 V risks permanent junction damage, and operation above 36 V violates recommended conditions even if within absolute max ratings.
Does TL431AQDBZR require external compensation in SMPS feedback designs?
Yes - a 100 pF ceramic capacitor is recommended directly at the REF pin to damp high-frequency switching noise coupled from the primary side via optocoupler. This prevents oscillation and ensures stable regulation, especially when output capacitance exceeds 1 nF or layout introduces parasitic inductance.
Can TL431AQDBZR replace a Zener diode directly?
Yes, with proper external resistor configuration: connect anode to ground, cathode to unregulated input, and REF to a voltage divider between cathode and ground. Unlike Zeners, TL431AQDBZR provides sharp turn-on, lower dynamic impedance (0.2 Ω vs. >10 Ω), and ±1 % reference accuracy over temperature - improving regulation fidelity and thermal stability.
Is TL431AQDBZR qualified for automotive use per AEC-Q100?
No - although TL431AQDBZR was previously AEC-Q100 Grade 1 qualified, Revision 8 (September 2025) explicitly states that TL431AQDBZR has had its automotive qualification status removed and is no longer applicable to automotive applications. It remains suitable for industrial and commercial use with –40 °C to +125 °C operation.
TL431AQDBZRVL 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:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TL431AQDBZRVL FAQ
1.How can I place an order for TL431AQDBZRVL through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AQDBZRVL 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 TL431AQDBZRVL reliable?
The price and inventory of TL431AQDBZRVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AQDBZRVL is usually 5 days.
3.What payment methods are accepted for TL431AQDBZRVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AQDBZRVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AQDBZRVL?
TL431AQDBZRVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AQDBZRVL 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 TL431AQDBZRVL?
For technical support, including TL431AQDBZRVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AQDBZRVL requirements.
6.How does Aetrix verify that TL431AQDBZRVL is sourced from the original manufacturer or authorized distributors?
All TL431AQDBZRVL 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 TL431AQDBZRVL meets industry standards.
7.What is the process for return or replacement of TL431AQDBZRVL?
All TL431AQDBZRVL units undergo pre-shipment inspection (PSI). If there is an issue with TL431AQDBZRVL, 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 TL431AQDBZRVL part is unused and in its original packaging.
Return procedure for TL431AQDBZRVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AQDBZRVL Tags
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