My Inquiry
My Account
Nexperia USA Inc. TL431IDBZR-QR
- Part No.:
- TL431IDBZR-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431IDBZR-QR.pdf
- Description:
- IC VREF SHUNT 2.495V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,548
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431IDBZR-QR from Nexperia is an A-grade (1.0 % tolerance), automotive-qualified adjustable precision shunt regulator in SOT23 package, with 2.495 V reference voltage, 1 mA to 100 mA sink current capability, and operation over −40 °C to +85 °C. It functions as a programmable voltage reference or shunt regulator in feedback loops of isolated DC-DC converters.
For engineers reviewing the TL431IDBZR-QR datasheet, TL431IDBZR-QR pinout, TL431IDBZR-QR application, or TL431IDBZR-QR equivalent, this page delivers verified electrical parameters, validated SOT23 pin mapping, automotive-grade thermal performance data, and real-world use cases in SMPS feedback and precision current sinking.
Technical Context
The TL431IDBZR-QR implements a three-terminal shunt regulator architecture with internal bandgap reference, error amplifier, and NPN output stage. Its reference voltage is set externally via two resistors between cathode and anode, enabling output programming from 2.495 V to 36 V.
It features 0.2 Ω typical dynamic cathode-anode impedance, 2–4 μA reference input current, and 9 mV typical reference voltage drift across −40 °C to +85 °C. Qualified per AEC-Q100 Grade 1, it supports stable operation in automotive power systems without external compensation under standard load capacitance conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1.0 % - sets precise threshold for feedback or regulation at 25 °C with 10 mA cathode current |
| Cathode Current Range | 1 mA to 100 mA - enables direct replacement of Zener diodes in low-to-moderate power shunt applications |
| Temperature Range | −40 °C to +85 °C - qualified for under-hood automotive electronics and industrial control environments |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage variation under fast transient load changes |
| Reference Input Current | 2–4 μA - allows high-value resistor dividers (>100 kΩ) without significant voltage error |
| AEC-Q100 Grade | Grade 1 - certified for automotive use with junction temperature up to +125 °C and ESD robustness ≥4 kV HBM |
| Package | SOT23 - surface-mount footprint compatible with automated assembly and space-constrained PCB layouts |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm × 1.0 mm body, standard pinning configuration (K-REF-A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K (Cathode) | Sink output terminal | Carries regulated current to ground; connects to feedback node in SMPS secondary-side circuits |
| 2 - REF (Reference) | Voltage sense input | High-impedance node comparing external resistor divider voltage to internal 2.495 V reference |
| 3 - A (Anode) | Return path | Connects to system ground or return rail; completes current path when cathode sinks current |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.495 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage references |
| Low Output Impedance | 0.2 Ω typical - maintains regulation accuracy during rapid load transients in power supply feedback paths |
| Automotive Qualification | AEC-Q100 Grade 1 - validated for engine control units, body electronics, and ADAS power rails |
| Sharp Turn-On Characteristic | Sub-100 ns response to reference voltage crossing - enables clean switching in comparator and limiter configurations |
| Low Reference Current | 2–4 μA - reduces power loss in high-resistance feedback networks used in isolated topologies |
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 2.495 V reference to drive optocoupler LED; regulates output by modulating LED current based on sensed voltage. Use Value: Enables ±1 % output voltage regulation across line/load/temperature while maintaining galvanic isolation and meeting automotive EMC requirements. |
Use Scenario: Constant-current biasing of laser diodes or LEDs in automotive lighting modules. IC Role / Device Role / Timing Role: Precision current sink where REF pin senses voltage across sense resistor, and cathode sinks exact current determined by Rsense = 2.495 V / Iset. Use Value: Delivers 1 % current accuracy over −40 °C to +85 °C without trimming, replacing discrete op-amp + transistor solutions. |
| Adjustable Shunt Regulator | Single-Supply Comparator |
Use Scenario: On-board 5 V or 12 V rail stabilization in automotive infotainment head units. IC Role / Device Role / Timing Role: Three-terminal shunt regulator clamping voltage by sinking excess current through cathode when input exceeds programmed threshold. Use Value: Replaces 5.1 V Zener diodes with tighter tolerance, lower impedance, and better thermal stability-reducing output ripple by >30 % at 100 kHz. |
Use Scenario: Overvoltage detection circuit triggering shutdown when battery voltage exceeds 15.5 V in 12 V automotive systems. IC Role / Device Role / Timing Role: Comparator with temperature-compensated threshold using internal 2.495 V reference and external resistor divider scaling input voltage. Use Value: Provides stable trip point independent of ambient temperature drift, eliminating need for external temperature compensation components. |
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 only | Limited to commercial-temperature automotive accessories (e.g., center console modules) | Select when ambient operating temperature stays above 0 °C and cost sensitivity outweighs extended range needs |
| TL431BIDBZR-Q | B-grade (0.5 % tolerance), same −40 °C to +85 °C range, identical SOT23 pinout | Higher precision required in battery management or sensor excitation circuits | Choose when reference accuracy dominates over cost, and 0.5 % tolerance justifies premium pricing |
Compared with TL431IDBZR-QR, TL431ACDBZR-Q trades temperature range for lower cost in non-critical zones, while TL431BIDBZR-Q improves reference accuracy by 50 % at the expense of tighter process control and higher unit price-making TL431IDBZR-QR the optimal balance for mainstream automotive power regulation.
Availability
TL431IDBZR-QR is available at Aetrix Electronics and suitable for automotive power supplies, isolated DC-DC converters, and precision current-sinking circuits requiring stable component supply across production lifecycles.
Supply support for TL431IDBZR-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 delivering high-performance, reliable logic, discrete, and MOSFET devices optimized for automotive, industrial, and consumer applications.
The TL431-Q family is part of Nexperia's automotive-qualified analog portfolio, designed specifically to replace Zener diodes in safety-critical and thermally demanding power regulation tasks.
FAQ
What is the maximum cathode-anode voltage for TL431IDBZR-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 applies above 25 °C ambient-e.g., max 30 V at 85 °C with standard FR4 PCB mounting.
Can TL431IDBZR-QR be used without external capacitors?
Yes-it operates stably without external compensation in most shunt regulator configurations. However, a 100 pF capacitor at the REF pin is recommended in isolated SMPS feedback loops to suppress high-frequency noise coupling from the primary side through the optocoupler.
How does the 1.0 % reference tolerance affect output voltage accuracy?
At 25 °C with 10 mA cathode current, the reference voltage is guaranteed between 2.470 V and 2.520 V. When used with 1 % resistor dividers, total output error remains within ±2 % across temperature and line conditions-sufficient for most automotive auxiliary rails and sensor biasing.
Is TL431IDBZR-QR pin-compatible with non-automotive TL431 variants?
Yes-SOT23 pinout (K-REF-A) matches industry-standard TL431 devices including TI, ON Semiconductor, and Diodes Inc. equivalents. However, AEC-Q100 qualification, tighter thermal specs, and enhanced ESD protection (4 kV HBM) are unique to the -Q suffix variants.
TL431IDBZR-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:
- ±2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
TL431IDBZR-QR FAQ
1.How can I place an order for TL431IDBZR-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDBZR-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 TL431IDBZR-QR reliable?
The price and inventory of TL431IDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDBZR-QR is usually 5 days.
3.What payment methods are accepted for TL431IDBZR-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDBZR-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDBZR-QR?
TL431IDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDBZR-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 TL431IDBZR-QR?
For technical support, including TL431IDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDBZR-QR requirements.
6.How does Aetrix verify that TL431IDBZR-QR is sourced from the original manufacturer or authorized distributors?
All TL431IDBZR-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 TL431IDBZR-QR meets industry standards.
7.What is the process for return or replacement of TL431IDBZR-QR?
All TL431IDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDBZR-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 TL431IDBZR-QR part is unused and in its original packaging.
Return procedure for TL431IDBZR-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDBZR-QR Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
