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Texas Instruments TL431CDBVTE4
- Part No.:
- TL431CDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431CDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,576
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Product details
Overview
TL431CDBVTE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B grade), 0.2 Ω typical dynamic impedance, and operation from 0°C to 70°C. It functions as an adjustable 2.5–36 V shunt regulator in feedback loops of isolated DC/DC converters and serves as a Zener diode replacement in voltage monitoring and secondary-side regulation circuits.
For engineers reviewing the TL431CDBVTE4 datasheet, TL431CDBVTE4 pinout, TL431CDBVTE4 application, or TL431CDBVTE4 equivalent, key selection criteria include reference accuracy over temperature, cathode current capability (1–100 mA), low output impedance for stable regulation, and compatibility with standard SOT-23-3 PCB footprints in space-constrained power designs.
Technical Context
The TL431CDBVTE4 implements a three-terminal adjustable shunt regulator architecture with an internal precision op-amp and NPN transistor output stage. Its reference input (REF) compares against a 2.495 V bandgap-derived threshold, controlling cathode current sink to maintain regulated voltage across external resistive dividers.
It operates exclusively in shunt mode - requiring an external anode connection to system ground or return path - and exhibits sharp turn-on characteristics with <1 µA off-state cathode leakage at 36 V and 0.4–0.6 mA minimum regulation current, enabling high-efficiency feedback in flyback SMPS topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.495 V nominal; enables precise 2.5–36 V output setting via two external resistors |
| Initial Tolerance | ±0.5% at 25°C (B grade); ensures tight voltage setpoint without calibration |
| Temp Range | 0°C to 70°C (C grade); suitable for commercial ambient environments |
| Dynamic Impedance | 0.2 Ω typical; provides stable regulation under varying load/transient conditions |
| Cathode Current | 1–100 mA sink range; supports direct interface with optocoupler LEDs in isolated feedback |
| Ref Input Current | 2–4 µA; minimizes divider resistor power loss and thermal drift impact |
| Voltage Drift | 6 mV max over 0°C–70°C; ensures <0.025% output variation across operating range |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current output | Sinks regulated current to maintain voltage at REF node; connects to feedback node in SMPS |
| 2 (REF) | Precision reference input | High-impedance threshold input referenced to ANODE; sets regulation point via resistor divider |
| 3 (ANODE) | Common return path | Typically tied to system ground or power return; defines voltage reference baseline for REF |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 2.5 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage references |
| Low Output Noise | Enables clean feedback in sensitive analog control loops without added filtering |
| Zener Replacement Capability | Sharp turn-on and low impedance allow direct substitution in legacy Zener-based regulators |
| Stable Over Temperature | 6 mV max Vref deviation from 0°C to 70°C - maintains accuracy without external compensation |
| Low Reference Current | 2–4 µA input current reduces power loss in high-resistance feedback networks |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Feedback control in isolated flyback converters where primary-side sensing is impractical. IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference to optocoupler LED driver circuit. Use Value: Enables ±1% output voltage regulation across line/load/temperature with minimal component count. | Use Scenario: On-board voltage clamping and reference generation in low-power analog subsystems. IC Role / Device Role / Timing Role: Precision shunt element replacing discrete Zener diodes in 2.5–36 V applications. Use Value: Delivers tighter tolerance (±0.5%), lower dynamic impedance (0.2 Ω), and better thermal stability than standard Zeners. |
| Voltage Monitoring | Adjustable Power Supply Reference |
Use Scenario: Undervoltage lockout (UVLO) and overvoltage detection in battery-powered systems. IC Role / Device Role / Timing Role: Comparator reference input with integrated precision threshold for fault detection logic. Use Value: Provides stable 2.495 V reference independent of supply rail variations, improving detection reliability. | Use Scenario: Programmable output adjustment in lab-grade bench power supplies and programmable loads. IC Role / Device Role / Timing Role: Adjustable shunt reference defining output voltage via digital potentiometer or DAC-controlled divider. Use Value: Supports continuous 2.5–36 V output tuning with <0.025% drift over 0°C–70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 1% initial tolerance (A grade), same SOT-23-3 package and electrical specs | Lower accuracy requirement; acceptable for cost-sensitive non-critical regulation | Select when ±1% reference tolerance meets system spec and BOM cost reduction is prioritized |
| TLVH431IDBVR | Higher 1.24 V reference, 2% tolerance, 1.5–30 V output range, lower 80 µA max Iref | Used where lower reference voltage simplifies divider design or lower quiescent current is critical | Choose for ultra-low-power applications or when 1.24 V reference better matches control IC thresholds |
Compared with TL431ACDBVR and TLVH431IDBVR, TL431CDBVTE4 offers the highest initial accuracy (±0.5%) in the SOT-23-3 footprint, making it optimal for applications demanding tight output regulation without calibration - especially in isolated SMPS feedback where reference stability directly impacts cross-regulation and transient response.
Availability
TL431CDBVTE4 is available at Aetrix Electronics and suitable for secondary-side regulation in flyback SMPSs, voltage monitoring in industrial controls, and Zener replacement in analog power management requiring stable component supply across production lifecycles.
Supply support for TL431CDBVTE4 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing solutions, with leadership in precision analog ICs and power management.
The TL431 product line delivers highly stable, programmable shunt references designed for voltage regulation, feedback control, and precision thresholding in power conversion, industrial automation, and test equipment.
FAQ
What is the reference voltage tolerance of TL431CDBVTE4 at 25°C?
The TL431CDBVTE4 has a ±0.5% initial reference voltage tolerance at 25°C, corresponding to the B grade specification. This means its Vref falls between 2.483 V and 2.507 V under nominal conditions, as confirmed in Section 7.11 of the TI SLVS543P datasheet for TL431BC devices in C-temp grade.
Does TL431CDBVTE4 support operation beyond 70°C?
No - TL431CDBVTE4 is rated for 0°C to 70°C only (C temperature grade). For extended temperature ranges, TI offers TL431I (–40°C to 85°C) and TL431Q (–40°C to 125°C) variants, but TL431CDBVTE4's characterization and guaranteed specifications apply strictly within the 0°C–70°C range.
What is the minimum cathode current required for regulation in TL431CDBVTE4?
The TL431CDBVTE4 requires a minimum cathode current of 0.4 mA to maintain regulation, with a typical value of 0.6 mA. This is specified in the "Imin" parameter under Electrical Characteristics for TL431BC devices in the C-temp grade (Section 7.11), and is critical for ensuring stable feedback in low-current optocoupler drive applications.
Can TL431CDBVTE4 be used as a comparator with integrated reference?
Yes - TL431CDBVTE4 can function as a comparator with built-in 2.495 V reference by connecting the REF pin to a signal source and using the CATHODE as open-collector output. Its sharp turn-on characteristic and low output impedance enable reliable threshold detection, as noted in the Applications section of the TI datasheet.
Is TL431CDBVTE4 pin-compatible with TL432 series devices?
No - TL431CDBVTE4 uses the standard TL431 pinout (CATHODE–REF–ANODE in SOT-23-3), whereas TL432 devices have reversed pinout (CATHODE–ANODE–REF). Interchanging them without PCB revision will cause functional failure; the datasheet explicitly states TL432 has "different pinouts for the DBV, DBZ, and PK packages."
TL431CDBVTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±2.2%
- 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:
- SOT-23-5
TL431CDBVTE4 FAQ
1.How can I place an order for TL431CDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431CDBVTE4 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 TL431CDBVTE4 reliable?
The price and inventory of TL431CDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431CDBVTE4 is usually 5 days.
3.What payment methods are accepted for TL431CDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431CDBVTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431CDBVTE4?
TL431CDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431CDBVTE4 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 TL431CDBVTE4?
For technical support, including TL431CDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431CDBVTE4 requirements.
6.How does Aetrix verify that TL431CDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TL431CDBVTE4 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 TL431CDBVTE4 meets industry standards.
7.What is the process for return or replacement of TL431CDBVTE4?
All TL431CDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431CDBVTE4, 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 TL431CDBVTE4 part is unused and in its original packaging.
Return procedure for TL431CDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431CDBVTE4 Tags
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