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Nexperia USA Inc. TL431CDBZR-QR
- Part No.:
- TL431CDBZR-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431CDBZR-QR.pdf
- Description:
- IC VREF SHUNT 2.495V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,186
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Product details
Overview
TL431CDBZR-QR from Nexperia is a three-terminal adjustable precision shunt regulator with 2.495 V reference voltage (±2.0 % tolerance), 1 mA to 100 mA sink current capability, and 0.2 Ω typical dynamic cathode-anode impedance. It operates across 0 °C to 70 °C ambient temperature and is qualified per AEC-Q100 Grade 1 for automotive feedback loops in isolated SMPS designs.
For engineers reviewing the TL431CDBZR-QR datasheet, TL431CDBZR-QR pinout, TL431CDBZR-QR application, or TL431CDBZR-QR equivalent, key selection criteria include reference voltage accuracy, thermal drift over 0–70 °C, cathode-anode voltage range (2.495 V to 36 V), and SOT23 package compatibility with high-density PCB layouts.
Technical Context
The TL431CDBZR-QR implements an internal bandgap reference and transconductance amplifier driving an NPN output stage, enabling precise voltage regulation via external resistor dividers. Its functional diagram confirms direct reference input (REF), cathode (K), and anode (A) terminals with no internal compensation-external 100 pF capacitor at REF is recommended for noise suppression in SMPS control loops.
It delivers sharp turn-on characteristics and low output impedance (0.2 Ω typ.) to replace Zener diodes in precision shunt and current-sink configurations. The device supports operation up to 36 V cathode-anode voltage and maintains stable regulation with IK ≥ 0.4 mA minimum cathode current across its rated temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage | 2495 mV ±2.0 % at 10 mA cathode current - sets regulated output voltage via two external resistors |
| Cathode current range | 1 mA to 100 mA - defines usable load/sink current capacity without exceeding power limits |
| Cathode-anode voltage | 2.495 V to 36 V - determines maximum output voltage programmability and headroom for shunt operation |
| Dynamic impedance | 0.2 Ω typical - ensures minimal output voltage deviation under fast load transients |
| Temp. drift (0–70 °C) | ±9 mV - guarantees reference stability in commercial-temperature automotive cabin modules |
| Reference current | 2–4 μA - enables high-impedance resistor divider networks without significant loading error |
| ESD rating | 4 kV HBM - provides robustness against handling-induced electrostatic discharge during assembly |
Pinout & Package
SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm footprint, 0.95 mm height, with standard pinning configuration: Pin 1 = Cathode (K), Pin 2 = Reference (REF), Pin 3 = Anode (A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Sink current path; connects to regulated output node in shunt topology |
| 2 (REF) | Reference input | High-impedance sense node tied to resistor divider midpoint; requires 100 pF bypass for SMPS stability |
| 3 (A) | Anode | Return path to ground or low-side rail; carries full cathode current minus reference current |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | Set from 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed-voltage regulators |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including engine control units and body electronics - meets reliability requirements for 15-year vehicle service life |
| Low output noise & impedance | 0.2 Ω dynamic impedance and low inherent noise - enables clean feedback signals in isolated DC-DC converters |
| Sharp turn-on characteristic | Fast response to reference voltage crossing threshold - improves transient regulation in precision current limiting |
| Three-grade tolerance options | Standard (2 %), A-Grade (1 %), B-Grade (0.5 %) - allows cost/performance trade-off across application tiers |
Applications
| Automotive Cabin Power Supply | Industrial Isolated SMPS Feedback |
|---|---|
Use Scenario: Regulating 5 V/3.3 V rails for infotainment and HVAC controllers in passenger compartment. IC Role / Device Role / Timing Role: Shunt regulator providing stable reference for secondary-side error amplification. Use Value: ±2.0 % reference accuracy ensures consistent voltage delivery despite battery voltage fluctuations (9–16 V). | Use Scenario: Closing feedback loop in flyback converter powering PLC I/O modules. IC Role / Device Role / Timing Role: Precision shunt reference on secondary side, optocoupled to primary PWM controller. Use Value: 0.2 Ω output impedance minimizes regulation error induced by optocoupler CTR variation and temperature drift. |
| LED Constant Current Sink | Single-Supply Threshold Comparator |
Use Scenario: Driving high-brightness LED strings in automotive lighting with thermal derating. IC Role / Device Role / Timing Role: Precision constant current sink configured with external sense resistor. Use Value: 1 mA–100 mA sink range and <1 μA off-state current enable dimming control down to 0.1 % duty cycle. | Use Scenario: Overvoltage detection in 12 V battery monitoring circuits. IC Role / Device Role / Timing Role: Single-supply comparator with temperature-compensated 2.495 V threshold. Use Value: ±9 mV drift over 0–70 °C ensures reliable trip point across engine bay temperature extremes. |
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 | 1.0 % reference voltage tolerance vs. 2.0 %; otherwise identical pinout, package, and electrical specs | Required where tighter output regulation is needed in high-precision sensor biasing or ADC reference buffers | Select when system-level voltage error budget demands <±12 mV total reference contribution |
| TL431BIDBZR-Q | 0.5 % tolerance and extended -40 °C to +85 °C operating range; same SOT23 package and pinout | Suitable for under-hood applications requiring wider temperature coverage and higher accuracy | Choose for engine control modules where ambient exceeds 70 °C and reference stability is critical |
Compared with TL431CDBZR-QR, TL431ACDBZR-Q reduces reference error by half for tighter regulation, while TL431BIDBZR-Q adds both tighter tolerance and broader temperature range-making it suitable for harsher environments where the C-grade's 0–70 °C limit is insufficient.
Availability
TL431CDBZR-QR is available at Aetrix Electronics and suitable for automotive cabin electronics, industrial isolated power supplies, LED driver circuits, and single-supply comparator designs requiring stable component supply with AEC-Q100 compliance.
Supply support for TL431CDBZR-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 discrete, logic, and MOSFET devices optimized for efficiency and miniaturization in automotive and industrial systems.
The TL431-Q family is designed specifically for precision voltage regulation and current sinking in automotive-grade power management, emphasizing AEC-Q100 qualification, thermal stability, and robustness in noisy electrical environments.
FAQ
What is the maximum cathode-anode voltage for TL431CDBZR-QR?
The absolute maximum cathode-anode voltage is 37 V, but the recommended operating range is 2.495 V to 36 V. Operation above 36 V risks exceeding safe power dissipation limits, especially at elevated temperatures or high cathode currents. Derating curves in the datasheet show power must be reduced linearly above 25 °C ambient.
Can TL431CDBZR-QR replace a Zener diode directly?
Yes-it functions as a 2.495 V adjustable Zener with superior performance: sharper knee, lower dynamic impedance (0.2 Ω vs. typical 10–100 Ω for Zeners), and programmable voltage up to 36 V. Unlike Zeners, it requires a minimum 1 mA cathode current and a reference input connection, so external resistor values must be recalculated for equivalent operation.
Is an external capacitor required at the REF pin?
A 100 pF capacitor is recommended at the REF pin in SMPS feedback applications to suppress high-frequency switching noise coupling into the reference node. In DC shunt or current-sink configurations with low-noise sources, it may be omitted-but stability testing under worst-case load transients is advised before removal.
How does temperature affect the reference voltage of TL431CDBZR-QR?
Over 0 °C to 70 °C, the reference voltage varies by ±9 mV (typical) due to internal bandgap circuitry. This corresponds to ~36 ppm/°C drift. The datasheet specifies this as ΔVref, not long-term aging-so the shift is reversible and repeatable within the rated temperature range, with no hysteresis observed.
TL431CDBZR-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:
- 0°C ~ 70°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
TL431CDBZR-QR FAQ
1.How can I place an order for TL431CDBZR-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431CDBZR-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 TL431CDBZR-QR reliable?
The price and inventory of TL431CDBZR-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431CDBZR-QR is usually 5 days.
3.What payment methods are accepted for TL431CDBZR-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431CDBZR-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431CDBZR-QR?
TL431CDBZR-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431CDBZR-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 TL431CDBZR-QR?
For technical support, including TL431CDBZR-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431CDBZR-QR requirements.
6.How does Aetrix verify that TL431CDBZR-QR is sourced from the original manufacturer or authorized distributors?
All TL431CDBZR-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 TL431CDBZR-QR meets industry standards.
7.What is the process for return or replacement of TL431CDBZR-QR?
All TL431CDBZR-QR units undergo pre-shipment inspection (PSI). If there is an issue with TL431CDBZR-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 TL431CDBZR-QR part is unused and in its original packaging.
Return procedure for TL431CDBZR-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431CDBZR-QR Tags
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