My Inquiry
My Account
Nexperia USA Inc. TL431CDBZR,215
- Part No.:
- TL431CDBZR,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431CDBZR,215.pdf
- Description:
- IC VREF SHUNT ADJ 2% TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:16,791
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431CDBZR,215 from Nexperia is a three-terminal adjustable precision shunt regulator with 2.0 % reference voltage tolerance (2440–2550 mV at 10 mA), 0 °C to 70 °C operating range, and SOT23 package. It functions as a programmable voltage reference or shunt regulator in feedback loops of isolated DC-DC converters, precision current sinks, and on-board voltage regulation circuits.
For engineers reviewing the TL431CDBZR,215 datasheet, TL431CDBZR,215 pinout, TL431CDBZR,215 application, or TL431CDBZR,215 equivalent, key selection criteria include reference voltage accuracy, cathode current capability (1–100 mA), dynamic impedance (0.2 Ω typ), temperature drift (±9 mV over 0–70 °C), and SOT23 thermal performance (Rth(j-a) = 360 K/W).
Technical Context
The TL431CDBZR,215 implements an internal bandgap reference and transconductance amplifier driving an NPN output stage, enabling precise two-resistor programming of output voltage from 2.495 V to 36 V. Its sharp turn-on characteristic and low output impedance (0.2 Ω) support stable regulation under dynamic load conditions.
It operates as a shunt device: cathode-anode voltage (VKA) is set by external resistor dividers connected to the REF pin, while sink current flows from cathode to anode. The reference input draws only 2–4 μA, minimizing divider loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (Vref) | 2440–2550 mV at 10 mA; defines minimum programmable output voltage and sets accuracy baseline for external resistor network |
| Cathode current (IK) | 1–100 mA operational range; determines maximum power dissipation and compatible external series resistance |
| Output impedance (ZKA) | 0.2 Ω typical; ensures minimal output voltage variation under load transients in feedback applications |
| Temperature drift (ΔVref) | ±9 mV over 0–70 °C; enables stable regulation without external compensation in commercial-grade systems |
| Reference input current (Iref) | 2–4 μA; allows high-value resistor dividers (>100 kΩ) to minimize quiescent current in battery-powered designs |
| Cathode-anode voltage (VKA) | 2.495–36 V programmable range; supports wide-input SMPS feedback and high-side sensing up to 36 V rails |
| Dynamic impedance vs frequency | <0.5 Ω up to 10 kHz; maintains loop stability in isolated flyback controllers with optocoupler compensation |
Pinout & Package
SOT23-3 plastic surface-mounted package (3.0 × 1.4 × 1.1 mm), standard pinning configuration per Table 3: Pin 1 = Cathode (K), Pin 2 = Reference (REF), Pin 3 = Anode (A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - K (Cathode) | Sink current output terminal | Connects to positive rail or SMPS transformer secondary; carries full regulated current; requires thermal pad routing for >50 mA operation |
| 2 - REF (Reference) | High-impedance voltage sense input | Connected to resistor divider midpoint; 2–4 μA bias current enables use of high-R dividers; sensitive to noise-requires local 100 pF bypass |
| 3 - A (Anode) | Current return path | Typically tied to system ground or negative rail; forms current loop with cathode; must be low-impedance for stable regulation |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.495 V to 36 V using two external resistors-enables single BOM for multiple output voltages in power supply families |
| Low dynamic output impedance | 0.2 Ω typical-reduces output voltage droop during load steps, critical for tight-tolerance SMPS feedback loops |
| Sharp turn-on characteristic | Fast response to reference voltage crossing threshold-eliminates Zener-like soft knee, improving regulation linearity |
| Low reference input current | 2–4 μA-minimizes divider power loss and resistor self-heating errors in precision applications |
| Stable operation with capacitive loads | Compatible with ≥1 nF load capacitance without oscillation-supports direct connection to optocoupler LEDs in isolated topologies |
Applications
| Isolated SMPS Feedback Loop | Precision Current Sink |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt regulator providing error signal to optocoupler LED; sets crossover frequency via REF pin impedance. Use Value: 0.2 Ω dynamic impedance ensures <1 % output voltage deviation during 10–90 % load steps, maintaining ±1 % output regulation. |
Use Scenario: Constant-current source for LED biasing or sensor excitation in industrial analog front-ends. IC Role / Device Role / Timing Role: Precision shunt element defining current through external sense resistor; replaces discrete op-amp + transistor solutions. Use Value: 2.0 % Vref tolerance and ±9 mV drift enable ≤2.5 % total current error over 0–70 °C without calibration. |
| On-Board Voltage Regulation | Programmable Threshold Comparator |
Use Scenario: Local 3.3 V or 5 V regulation from higher intermediate bus (e.g., 12 V) in embedded control modules. IC Role / Device Role / Timing Role: Adjustable shunt regulator clamping voltage; used with series resistor to limit current into downstream LDO or microcontroller I/O. Use Value: Sink capability up to 100 mA allows regulation of moderate-current peripherals without external pass transistor. |
Use Scenario: Single-supply overvoltage detection in battery management or power sequencing circuits. IC Role / Device Role / Timing Role: Precision comparator with temperature-compensated threshold set by REF pin voltage divider. Use Value: Bandgap-derived reference ensures threshold stability across temperature-±9 mV drift enables reliable 5 % OV detection window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBZR | 1.0 % Vref tolerance (2470–2520 mV); same SOT23 package and pinout | Required where tighter initial accuracy needed for uncalibrated systems (e.g., medical sensors) | Select when reference accuracy dominates system error budget and cost premium is acceptable |
| TL431BIDBZR | 0.5 % Vref tolerance (2483–2507 mV); -40 °C to +85 °C temp range; SOT23 mirrored pinning | Supports extended temperature industrial environments but requires PCB layout revision due to pin 1/2 swap | Choose for automotive-adjacent industrial controls needing higher accuracy and wider temp range; verify pin compatibility |
Compared with TL431CDBZR,215, TL431ACDBZR improves initial accuracy by 1 % at the cost of ~15 % higher unit price, while TL431BIDBZR extends temperature range and tightens tolerance but introduces pinout redesign risk-making TL431CDBZR optimal for cost-sensitive commercial designs within 0–70 °C.
Availability
TL431CDBZR,215 is available at Aetrix Electronics and suitable for isolated SMPS feedback loops, precision current sinks, and on-board voltage regulation requiring stable component supply across commercial temperature ranges.
Supply support for TL431CDBZR,215 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 logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for consumer, industrial, and automotive markets.
The TL431 family targets precision voltage regulation and feedback applications in power conversion, offering programmable shunt regulation with grade-specific tolerances and robust thermal performance in compact SOT23 packages.
FAQ
What is the maximum cathode-anode voltage for TL431CDBZR,215?
The absolute maximum cathode-anode voltage is 37 V per IEC 60134 limiting values. For continuous operation, the recommended maximum is 36 V. Exceeding 37 V risks permanent damage to the internal junction, and operation above 36 V reduces long-term reliability even if within absolute max ratings.
Can TL431CDBZR,215 replace a Zener diode directly?
Yes-it can directly replace Zener diodes in shunt regulation roles, but requires two external resistors to set voltage and a minimum cathode current of 0.4 mA. Unlike Zeners, it offers superior temperature stability (±9 mV vs typical ±50 mV), lower dynamic impedance (0.2 Ω vs 10–100 Ω), and programmable voltage up to 36 V.
Does TL431CDBZR,215 require an input capacitor?
No input capacitor is required, but a 100 pF ceramic capacitor between REF and A (anode) is strongly recommended to suppress high-frequency noise coupling into the reference input-especially in SMPS feedback applications where switching noise may cause regulation instability or audible whine.
Is TL431CDBZR,215 qualified for automotive use?
No-per Revision History v.8 (20250903), TL431CDBZR,215 has standard qualification and is not AEC-Q100 rated. Automotive-qualified variants include TL431AQDBZR and TL431BQDBZR (grade 1, -40 °C to +125 °C), which are explicitly listed as qualified in the datasheet's revision log.
TL431CDBZR,215 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
TL431CDBZR,215 FAQ
1.How can I place an order for TL431CDBZR,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431CDBZR,215 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,215 reliable?
The price and inventory of TL431CDBZR,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431CDBZR,215 is usually 5 days.
3.What payment methods are accepted for TL431CDBZR,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431CDBZR,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431CDBZR,215?
TL431CDBZR,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431CDBZR,215 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,215?
For technical support, including TL431CDBZR,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431CDBZR,215 requirements.
6.How does Aetrix verify that TL431CDBZR,215 is sourced from the original manufacturer or authorized distributors?
All TL431CDBZR,215 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,215 meets industry standards.
7.What is the process for return or replacement of TL431CDBZR,215?
All TL431CDBZR,215 units undergo pre-shipment inspection (PSI). If there is an issue with TL431CDBZR,215, 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,215 part is unused and in its original packaging.
Return procedure for TL431CDBZR,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431CDBZR,215 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…
