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Nexperia USA Inc. TL431ACDBZR-QR
- Part No.:
- TL431ACDBZR-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431ACDBZR-QR.pdf
- Description:
- IC VREF SHUNT 2.495V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,566
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Product details
Overview
TL431ACDBZR-QR from Nexperia is an A-grade (±1.0 %) adjustable precision shunt regulator in SOT23 package, featuring 2.495 V reference voltage, 0.2 Ω dynamic cathode-anode impedance, and sink current capability from 1 mA to 100 mA. It operates across –40 °C to +85 °C and is qualified to AEC-Q100 Grade 1 for automotive feedback loops.
For engineers reviewing the TL431ACDBZR-QR datasheet, TL431ACDBZR-QR pinout, TL431ACDBZR-QR application, or TL431ACDBZR-QR equivalent, key selection criteria include reference tolerance (1.0 %), thermal drift (±9 mV over 0–70 °C), cathode-anode voltage range (2.495 V to 36 V), and SOT23 pin-compatible layout for space-constrained power regulation designs.
Technical Context
The TL431ACDBZR-QR implements a precision bandgap reference with internal error amplifier and NPN output stage, enabling programmable shunt regulation via two external resistors. Its functional diagram confirms direct cathode–anode–reference terminal topology without internal pass transistor or LDO architecture.
It delivers sharp turn-on characteristics and low output noise due to active regulation-distinct from passive Zener diodes-and supports stable operation up to 100 mA sink current with <0.5 Ω dynamic impedance below 1 kHz, making it suitable for isolated SMPS feedback and precision current sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1.0 % (2470–2520 mV at 10 mA, 25 °C); sets regulated output via resistor divider |
| Cathode-Anode Voltage Range | 2.495 V to 36 V; enables wide-range programmable output without external series pass element |
| Sink Current Range | 1 mA to 100 mA; supports direct load regulation or feedback biasing in SMPS controllers |
| Dynamic Impedance | 0.2 Ω typical (f < 1 kHz); ensures minimal output voltage deviation under transient load changes |
| Temperature Drift | ±9 mV over 0–70 °C; maintains tight regulation in commercial and automotive ambient conditions |
| Reference Input Current | 2.0–4.0 μA; low bias requirement simplifies high-impedance resistor networks for voltage setting |
| AEC-Q100 Qualification | Grade 1 (–40 °C to +125 °C junction); validated for automotive under-hood and infotainment power systems |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm footprint, 0.95 mm height; standard pinning configuration per Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K (Cathode) | Current sink output terminal | Connects to regulated rail or SMPS optocoupler LED anode; carries full load/sink current |
| 2 - REF (Reference) | Precision voltage sense input | High-impedance node (2–4 μA bias) used with R1/R2 divider to set output voltage |
| 3 - A (Anode) | Return path and ground reference | Common return for cathode current and reference divider; must be low-impedance to avoid regulation error |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | Set from 2.495 V to 36 V using only two external resistors-no trimming or calibration required |
| A-grade reference tolerance | ±1.0 % at 25 °C ensures tighter initial accuracy than standard-grade (±2.0 %) variants |
| Low dynamic output impedance | 0.2 Ω typical enables stable regulation under fast load transients in feedback control loops |
| Automotive qualification | AEC-Q100 Grade 1 compliance guarantees reliability in automotive power management and body electronics |
| Sharp turn-on characteristic | Active error amplifier provides steep regulation knee-superior to Zener diodes in precision applications |
Applications
| Shunt Regulator | Precision Current Limiter |
|---|---|
Use Scenario: On-board 5 V or 3.3 V rail regulation in automotive ECUs where space and cost limit use of integrated LDOs. IC Role / Device Role / Timing Role: Shunt regulator providing stable reference and sink path; replaces discrete Zener + transistor solutions. Use Value: Delivers ±1.0 % output accuracy over temperature with no external compensation, reducing BOM count by 2–3 components. |
Use Scenario: Overcurrent protection in 12 V battery-fed motor drivers or LED lighting modules. IC Role / Device Role / Timing Role: Precision current limiter using cathode as controlled sink node with fixed reference voltage. Use Value: Enables ±1.0 % current threshold accuracy (e.g., 200 mA ±2 mA) without sensing resistor calibration. |
| Isolated SMPS Feedback | Precision Constant Current Sink |
Use Scenario: Secondary-side voltage sensing in flyback converters for automotive infotainment power supplies. IC Role / Device Role / Timing Role: Error amplifier driving optocoupler LED to close regulation loop across isolation barrier. Use Value: Maintains ±1.0 % output regulation despite primary-side transformer tolerance and line/load variation. |
Use Scenario: Bias current source for analog sensor interfaces or reference buffers in ADAS domain controllers. IC Role / Device Role / Timing Role: Constant current sink anchored to precise 2.495 V reference, independent of supply rail fluctuations. Use Value: Provides sub-1 % current stability over –40 °C to +85 °C, eliminating need for op-amp-based current sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDQRTQ1 | Same A-grade tolerance and SOT23 package but with Q1 suffix indicating automotive qualification per AEC-Q100 Grade 1; identical electrical specs. | No functional difference-both rated for automotive use; TL431ACDQRTQ1 uses different marking and tape/reel packaging. | Select TL431ACDQRTQ1 when requiring TI-branded automotive-qualified variant with same pinout and performance. |
| TL431BIDBZR-Q | B-grade (±0.5 %) tolerance, wider operating range (–40 °C to +125 °C), otherwise identical SOT23 pinout and electrical behavior. | Higher accuracy and extended temperature support suit engine control units; requires no circuit redesign. | Choose TL431BIDBZR-Q when ±0.5 % reference accuracy or operation beyond +85 °C ambient is mandatory. |
Compared with TL431ACDBZR-QR, TL431ACDQRTQ1 offers identical performance in a TI-manufactured automotive-qualified package, while TL431BIDBZR-Q trades minor cost increase for ±0.5 % tolerance and +125 °C max ambient-enabling higher-accuracy or under-hood deployment without layout change.
Availability
TL431ACDBZR-QR is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS feedback, and precision current regulation requiring stable component supply across production lifecycles.
Supply support for TL431ACDBZR-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 technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
TL431ACDBZR-QR belongs to the TL431-Q family of adjustable precision shunt regulators, designed specifically for automotive-grade voltage reference and feedback applications requiring AEC-Q100 qualification and tight tolerance.
FAQ
What is the maximum cathode-anode voltage for TL431ACDBZR-QR?
The absolute maximum cathode-anode voltage is 37 V per IEC 60134 limiting values. The recommended operating range is 2.495 V to 36 V, with stable regulation maintained across this span when configured with appropriate external resistors and thermal management.
Does TL431ACDBZR-QR require external capacitors for stability?
A 100 pF capacitor is recommended at the REF pin to suppress high-frequency noise coupling-especially in SMPS feedback applications-but no output capacitor is required for basic shunt regulation. Stability is inherent due to the device's low output impedance and internal compensation.
How does the A-grade tolerance compare to standard-grade TL431 variants?
TL431ACDBZR-QR offers ±1.0 % reference voltage tolerance versus ±2.0 % for standard-grade (e.g., TL431CDBZR-Q), improving initial output accuracy by 2× without changing circuit topology or resistor values-critical for automotive diagnostics and sensor biasing.
Can TL431ACDBZR-QR replace a Zener diode directly?
Yes-it functions as an active, 3-terminal Zener replacement with superior characteristics: sharper knee, lower dynamic impedance (0.2 Ω vs. >10 Ω), and programmable voltage (2.495 V–36 V). Pin-compatible SOT23 layout allows drop-in substitution in most existing Zener-based shunt circuits.
TL431ACDBZR-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:
- 0°C ~ 70°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
TL431ACDBZR-QR FAQ
1.How can I place an order for TL431ACDBZR-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACDBZR-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 TL431ACDBZR-QR reliable?
The price and inventory of TL431ACDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACDBZR-QR is usually 5 days.
3.What payment methods are accepted for TL431ACDBZR-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACDBZR-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACDBZR-QR?
TL431ACDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACDBZR-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 TL431ACDBZR-QR?
For technical support, including TL431ACDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACDBZR-QR requirements.
6.How does Aetrix verify that TL431ACDBZR-QR is sourced from the original manufacturer or authorized distributors?
All TL431ACDBZR-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 TL431ACDBZR-QR meets industry standards.
7.What is the process for return or replacement of TL431ACDBZR-QR?
All TL431ACDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACDBZR-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 TL431ACDBZR-QR part is unused and in its original packaging.
Return procedure for TL431ACDBZR-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ACDBZR-QR Tags
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