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Nexperia USA Inc. TL431AIDBZR-QR
- Part No.:
- TL431AIDBZR-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431AIDBZR-QR.pdf
- Description:
- IC VREF SHUNT 2.495V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,619
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Product details
Overview
TL431AIDBZR-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 +85 °C. It functions as a programmable voltage reference or shunt regulator in feedback loops of automotive-grade DC-DC converters and isolated SMPS.
For engineers reviewing the TL431AIDBZR-QR datasheet, TL431AIDBZR-QR pinout, TL431AIDBZR-QR application, or TL431AIDBZR-QR equivalent, key selection criteria include reference voltage tolerance (1.0 %), cathode-anode voltage range (2.495 V to 36 V), thermal stability over –40 °C to +85 °C, dynamic impedance (0.2 Ω typ.), and AEC-Q100 Grade 1 qualification for automotive use.
Technical Context
The TL431AIDBZR-QR implements a three-terminal shunt regulator architecture with an internal bandgap reference, error amplifier, and NPN output stage. Its reference voltage is set externally via two resistors between cathode and anode, enabling precise output voltage programming from 2.495 V up to 36 V.
It delivers sharp turn-on characteristics and low output noise, supported by typical dynamic cathode-anode impedance of 0.2 Ω and reference current of 2–4 μA. The device operates with sink current from 1 mA to 100 mA and maintains ±1.0 % reference accuracy across its specified temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typical), ±1.0 % tolerance at 10 mA cathode current - enables accurate voltage setting in feedback networks |
| Cathode-Anode Voltage Range | 2.495 V to 36 V - supports wide-range programmable regulation without external series pass transistor |
| Sink Current Range | 1 mA to 100 mA - sufficient drive capability for optocoupler biasing and moderate-power shunt regulation |
| Dynamic Impedance | 0.2 Ω (typical) - ensures stable regulation under dynamic load transients in SMPS feedback paths |
| Temperature Range | –40 °C to +85 °C - qualified for under-hood automotive applications per AEC-Q100 Grade 1 |
| Reference Current | 2–4 μA (typical) - minimal loading on voltage divider, preserving accuracy in high-impedance feedback networks |
| Output Noise | Low - improves signal integrity in precision sensing and closed-loop control applications |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm footprint, 0.95 mm height, standard pinning configuration (K-REF-A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K (Cathode) | Current sink terminal | Connects to regulated output node; carries full load current in shunt configuration |
| 2 - REF (Reference) | Feedback input | High-impedance input sensing voltage divider midpoint; sets output voltage via R1/R2 ratio |
| 3 - A (Anode) | Return path | Connected to system ground or return rail; completes current path for regulation loop |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage regulators |
| A-grade reference tolerance | ±1.0 % at 25 °C - tighter than standard grade (±2.0 %), improving system-level voltage accuracy |
| AEC-Q100 Grade 1 qualification | Qualified for automotive applications - supports deployment in engine control units, body electronics, and ADAS power supplies |
| Low dynamic impedance | 0.2 Ω typical - minimizes output voltage deviation during fast load steps in feedback control loops |
| Sharp turn-on characteristic | Fast response to reference voltage crossing threshold - enhances stability in isolated flyback and forward converter feedback circuits |
Applications
| Automotive DC-DC Converter Feedback | Isolated Flyback SMPS Control |
|---|---|
Use Scenario: Regulating 5 V or 3.3 V rail in engine control module (ECM) power supply. IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference to error amplifier in secondary-side feedback loop. Use Value: ±1.0 % reference tolerance ensures output voltage remains within automotive specification limits (±3 %) across temperature and aging. |
Use Scenario: Secondary-side voltage sensing in 12 V to 5 V isolated flyback converter for infotainment system. IC Role / Device Role / Timing Role: Adjustable shunt reference driving optocoupler LED to close isolation barrier feedback loop. Use Value: Low 0.2 Ω dynamic impedance maintains loop stability despite transformer leakage inductance and optocoupler CTR variation. |
| Precision Current Sink for Sensor Biasing | Adjustable Overvoltage Protection Threshold |
Use Scenario: Providing stable 200 µA bias current to automotive pressure sensor bridge. IC Role / Device Role / Timing Role: Constant-current sink configured with external resistor between cathode and reference pins. Use Value: Reference voltage stability (±1.0 %) and low temperature drift ensure sensor excitation current remains within ±1.5 % over –40 °C to +85 °C. |
Use Scenario: Setting trip point for battery overvoltage protection in 12 V vehicle electrical system. IC Role / Device Role / Timing Role: Precision comparator with temperature-compensated threshold using internal 2.495 V reference. Use Value: Programmable threshold (e.g., 15.2 V via R1/R2) avoids false triggering due to reference drift, meeting ISO 16750-2 surge immunity requirements. |
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 - lower thermal grade | Restricted to commercial/industrial environments without extended temperature requirements | Select when automotive qualification and –40 °C operation are not required; lower cost alternative |
| TL431BIDBZR-Q | B-grade (±0.5 %) reference tolerance, same –40 °C to +85 °C range and SOT23 package | Higher accuracy needed for metrology-grade power supplies or calibration circuitry | Choose when tighter reference accuracy justifies higher unit cost and no additional thermal derating is needed |
Compared with TL431ACDBZR-Q, TL431AIDBZR-Q adds automotive temperature range and AEC-Q100 qualification without sacrificing accuracy; compared with TL431BIDBZR-Q, it trades 0.5 % tolerance for broader availability and lower cost while retaining full automotive suitability.
Availability
TL431AIDBZR-QR is available at Aetrix Electronics and suitable for automotive power management, isolated SMPS feedback, precision current limiting, and sensor biasing requiring stable component supply across production lifecycles.
Supply support for TL431AIDBZR-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 leading semiconductor manufacturer specializing in high-performance, reliable standard logic, analog, and discrete components, with strong focus on automotive and industrial markets.
TL431AIDBZR-QR belongs to the TL431-Q family of AEC-Q100 qualified shunt regulators, designed specifically for precision voltage reference and feedback control in automotive power systems where reliability and thermal stability are critical.
FAQ
What is the maximum cathode-anode voltage for TL431AIDBZR-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. Operation at 36 V requires thermal derating per Figure 2 - on FR4 PCB with standard footprint, max power dissipation drops to 350 mW at 25 °C ambient.
Can TL431AIDBZR-QR replace a Zener diode in a shunt regulator design?
Yes - it replaces Zener diodes with superior performance: sharper knee, lower dynamic impedance (0.2 Ω vs. >10 Ω for Zeners), and programmable voltage (2.495 V to 36 V). Unlike Zeners, its reference voltage is temperature-compensated and stable across –40 °C to +85 °C, making it ideal for automotive and industrial applications.
How does the REF pin function in TL431AIDBZR-QR?
The REF pin is a high-impedance input (2–4 μA typical current) that senses the voltage divider midpoint between cathode and anode. When REF voltage exceeds 2.495 V, the internal NPN transistor turns on, sinking current from cathode to anode. This closed-loop action regulates the output voltage precisely based on R1/R2 ratio.
Is TL431AIDBZR-QR compatible with optocouplers in isolated SMPS designs?
Yes - its 1–100 mA sink current range and low output impedance make it ideal for driving optocoupler LEDs in secondary-side feedback circuits. Typical configurations use 1–5 mA LED current, well within TL431AIDBZR-QR's capability, ensuring robust signal transmission across the isolation barrier while maintaining loop stability.
TL431AIDBZR-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 ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
TL431AIDBZR-QR FAQ
1.How can I place an order for TL431AIDBZR-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AIDBZR-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 TL431AIDBZR-QR reliable?
The price and inventory of TL431AIDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AIDBZR-QR is usually 5 days.
3.What payment methods are accepted for TL431AIDBZR-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AIDBZR-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AIDBZR-QR?
TL431AIDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AIDBZR-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 TL431AIDBZR-QR?
For technical support, including TL431AIDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AIDBZR-QR requirements.
6.How does Aetrix verify that TL431AIDBZR-QR is sourced from the original manufacturer or authorized distributors?
All TL431AIDBZR-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 TL431AIDBZR-QR meets industry standards.
7.What is the process for return or replacement of TL431AIDBZR-QR?
All TL431AIDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TL431AIDBZR-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 TL431AIDBZR-QR part is unused and in its original packaging.
Return procedure for TL431AIDBZR-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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