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Nexperia USA Inc. TL431AQDBZR-QR
- Part No.:
- TL431AQDBZR-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431AQDBZR-QR.pdf
- Description:
- IC VREF SHUNT 2.495V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
TL431AQDBZR-QR 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 operation across –40 °C to 125 °C. It serves as a programmable voltage reference or error amplifier in feedback loops of automotive-grade isolated DC-DC converters.
For engineers reviewing the TL431AQDBZR-QR datasheet, TL431AQDBZR-QR pinout, TL431AQDBZR-QR application, or TL431AQDBZR-QR equivalent, key selection criteria include reference tolerance (1.0 %), cathode-anode voltage range (2.495 V to 36 V), thermal stability over –40 °C to 125 °C, dynamic impedance (0.2 Ω typical), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The TL431AQDBZR-QR implements a bandgap-referenced error amplifier with internal 2.495 V reference, driving an NPN output stage to regulate cathode current based on REF pin voltage. Its three-terminal architecture enables two-resistor programming of output voltage from Vref up to 36 V.
It delivers sharp turn-on characteristics and low output noise, with typical dynamic cathode-anode impedance of 0.2 Ω below 1 kHz and reference current under 4 μA. The device supports stable operation with load capacitance up to 100 nF and maintains regulation down to 0.4 mA minimum cathode current at full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1.0 % (A-grade); sets precise threshold for feedback control loops |
| Cathode-Anode Voltage Range | 2.495 V to 36 V; enables wide-range programmable shunt regulation |
| Sink Current Range | 1 mA to 100 mA; supports direct drive of optocoupler LEDs or error amplifier loads |
| Temperature Range | –40 °C to +125 °C; qualified for under-hood automotive applications |
| Dynamic Impedance | 0.2 Ω typical (f < 1 kHz); ensures stable loop response in SMPS feedback paths |
| Reference Current | 2.0–4.0 μA; minimizes resistor-divider loading in high-impedance feedback networks |
| AEC-Q100 Grade | Grade 1 (–40 °C to +125 °C); certified for automotive powertrain and body electronics |
Pinout & Package
SOT23-3 plastic surface-mounted package (3.0 × 1.4 × 1.1 mm), standard pinning configuration per Table 3 and Figure 27.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K (Cathode) | Current sink output | Connects to high-side node of feedback divider or optocoupler anode; carries regulated load current |
| 2 - REF (Reference) | Feedback input | Senses divided output voltage; device regulates when REF = 2.495 V ±1.0 % |
| 3 - A (Anode) | Return path | Connected to system ground or low-side of feedback divider; completes current path |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | Set from 2.495 V to 36 V using two external resistors - eliminates need for multiple Zener diodes |
| A-grade reference tolerance | ±1.0 % at 25 °C - improves accuracy of voltage monitoring and overvoltage protection circuits |
| Low dynamic impedance | 0.2 Ω typical - enhances transient response and reduces output ripple in closed-loop regulation |
| Automotive qualification | AEC-Q100 Grade 1 - enables drop-in use in engine control units, ADAS power supplies, and infotainment systems |
| Sharp turn-on characteristic | Fast error amplifier response - prevents oscillation in isolated flyback feedback paths with optocouplers |
Applications
| Automotive DC-DC Feedback | Programmable Overvoltage Protection |
|---|---|
Use Scenario: Isolated flyback converter in vehicle infotainment power supply requiring tight output regulation across temperature. IC Role / Device Role / Timing Role: Shunt regulator in secondary-side feedback loop, driving optocoupler LED to adjust primary-side PWM duty cycle. Use Value: ±1.0 % reference tolerance ensures ±1.5 % output voltage accuracy over –40 °C to 125 °C, meeting automotive OEM requirements. |
Use Scenario: 12 V battery rail monitoring circuit that triggers shutdown if voltage exceeds 15.5 V during alternator surge. IC Role / Device Role / Timing Role: Precision voltage comparator with programmable threshold set by R1/R2 divider. Use Value: 2.495 V reference and 0.2 Ω dynamic impedance enable fast, jitter-free trip detection without external hysteresis components. |
| Adjustable Current Sink | Series Pass Regulator Reference |
Use Scenario: LED driver for dashboard backlighting requiring constant 20 mA current independent of forward voltage variation. IC Role / Device Role / Timing Role: Precision current sink configured with REF tied to cathode and series resistor to ground. Use Value: 1.0 % reference tolerance and 0.4–0.6 mA minimum cathode current ensure stable current regulation across temperature and unit-to-unit variation. |
Use Scenario: Low-noise 5 V linear regulator for MCU core supply in telematics module. IC Role / Device Role / Timing Role: Reference element for external PNP pass transistor, replacing fixed-voltage references. Use Value: Programmable 2.495–36 V range allows precise 5.00 V output with <±10 mV drift over temperature, improving ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR-Q | Same A-grade tolerance (±1.0 %) but rated for 0 °C to 70 °C ambient | Limited to commercial/industrial environments; not AEC-Q100 qualified | Select only for non-automotive designs where extended temperature range is unnecessary |
| TL431BQDBZR-Q | B-grade tolerance (±0.5 %), same –40 °C to 125 °C range and AEC-Q100 Grade 1 | Higher precision required for safety-critical voltage monitoring (e.g., battery management) | Choose when tighter reference accuracy justifies cost premium and board space is available |
Compared with TL431AQDBZR-QR, TL431ACDBZR-Q trades automotive qualification and extended temperature support for lower cost in benign environments, while TL431BQDBZR-Q provides higher reference accuracy at identical thermal and qualification specs - enabling tiered design reuse across product families.
Availability
TL431AQDBZR-QR is available at Aetrix Electronics and suitable for automotive power conversion, precision voltage monitoring, and programmable current regulation requiring stable component supply across production lifecycles.
Supply support for TL431AQDBZR-QR 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-enhancing components, delivering high-performance, reliable devices for automotive, industrial, and consumer markets.
TL431AQDBZR-QR belongs to the TL431-Q family of AEC-Q100 qualified shunt regulators, designed specifically for robust, precision voltage reference and feedback functions in automotive power systems.
FAQ
What is the maximum cathode-anode voltage for TL431AQDBZR-QR?
The absolute maximum cathode-anode voltage is 37 V, with recommended operating range from 2.495 V to 36 V. Exceeding 37 V risks permanent damage per IEC 60134 limiting values. Derating is required above 25 °C ambient per Figure 2's power curves.
Does TL431AQDBZR-QR require an external capacitor on the REF pin?
Yes - a 100 pF capacitor is recommended between REF and A (anode) to suppress high-frequency switching noise coupling into the reference input, especially in SMPS feedback applications per Figure 26. Larger values may cause instability.
Can TL431AQDBZR-QR replace a Zener diode directly?
Yes, in most cases: it operates as a 2.495 V shunt reference with superior temperature stability (±1.0 % vs typical Zener ±5 %), lower dynamic impedance (0.2 Ω vs 10–100 Ω), and programmable voltage via external resistors - but requires minimum 0.4 mA cathode current to maintain regulation.
Is TL431AQDBZR-QR pin-compatible with non-Q versions like TL431ACZ?
No - TL431AQDBZR-QR uses SOT23-3 with standard pinning (K-REF-A), while through-hole TL431ACZ uses TO-92 (K-A-REF). Even among SOT23 variants, "MFDT" suffixes indicate mirrored pinning (REF-K-A), making them electrically incompatible without PCB redesign.
TL431AQDBZR-QR 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:
- SOT-23-3 (TO-236)
TL431AQDBZR-QR FAQ
1.How can I place an order for TL431AQDBZR-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AQDBZR-QR 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 TL431AQDBZR-QR reliable?
The price and inventory of TL431AQDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AQDBZR-QR is usually 5 days.
3.What payment methods are accepted for TL431AQDBZR-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AQDBZR-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AQDBZR-QR?
TL431AQDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AQDBZR-QR 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 TL431AQDBZR-QR?
For technical support, including TL431AQDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AQDBZR-QR requirements.
6.How does Aetrix verify that TL431AQDBZR-QR is sourced from the original manufacturer or authorized distributors?
All TL431AQDBZR-QR 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 TL431AQDBZR-QR meets industry standards.
7.What is the process for return or replacement of TL431AQDBZR-QR?
All TL431AQDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TL431AQDBZR-QR, 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 TL431AQDBZR-QR part is unused and in its original packaging.
Return procedure for TL431AQDBZR-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AQDBZR-QR Tags
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