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Texas Instruments TL431BIDBVRE4
- Part No.:
- TL431BIDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431BIDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,464
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Product details
Overview
TL431BIDBVRE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.483–2.507 V reference voltage at 25°C with ±0.5% initial tolerance (B grade), 14 mV max reference voltage deviation over −40°C to 85°C, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as an adjustable voltage reference in secondary-side regulation of isolated flyback SMPSs.
For engineers reviewing the TL431BIDBVRE4 datasheet, TL431BIDBVRE4 pinout, TL431BIDBVRE4 application, or TL431BIDBVRE4 equivalent, this page delivers verified electrical specs, thermal behavior, pin-level circuit roles, real-world use cases, and validated alternative parts - all confirmed for the exact TL431BIDBVRE4 variant (B-grade, I-temp, DBV package).
Technical Context
The TL431BIDBVRE4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable Zener diode replacement in precision feedback loops.
It operates across −40°C to +85°C (I-temp grade) with cathode voltage range from Vref to 36 V and requires only two external resistors to set output voltage. Reference input current remains stable at 2–4 µA, minimizing resistor-divider loading effects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref (25°C) | 2.483–2.507 V - tight 0.5% tolerance enables high-accuracy feedback without trimming |
| Vref Deviation (−40°C to 85°C) | 14 mV max - ensures stable regulation across industrial temperature range |
| Dynamic Impedance | 0.2 Ω typical - provides low-noise, stiff reference node for sensitive control circuits |
| Cathode Current Range | 1–100 mA - supports wide load variation in SMPS feedback and voltage monitor designs |
| Reference Input Current | 2–4 µA - low bias current reduces power loss and resistor-divider error |
| Min Cathode Current for Regulation | 0.4–0.7 mA - enables stable operation even under light-load conditions |
| Off-State Cathode Current | 0.1–0.5 µA - ensures minimal leakage when disabled or below threshold |
Pinout & Package
SOT-23-3 (DBV) package: 2.90 mm × 1.30 mm body, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output / voltage sense input | Connects to regulated output node; sinks current to maintain Vref at REF pin |
| Pin 2 (REF) | Reference threshold input | Compares external divider voltage to internal 2.495 V reference; controls conduction |
| Pin 3 (ANODE) | Common return / ground reference | Typically connected to system ground or low-side return path; defines voltage reference point |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 2.5 V to 36 V via two-resistor divider - replaces fixed-voltage references and discrete Zeners |
| Low Temperature Drift | 14 mV max over −40°C to 85°C - maintains accuracy in uncontrolled thermal environments |
| Sharp Turn-On Characteristic | Sub-100 mV transition region - enables clean switching in comparator and protection circuits |
| Low Output Noise | Specified as "low" with 0.2 Ω impedance - minimizes ripple injection into feedback paths |
| High Sink-Current Capability | 100 mA max - drives optocoupler LEDs directly in isolated SMPS feedback without buffer |
Applications
| Isolated Flyback SMPS Feedback | Zener Diode Replacement |
|---|---|
Use Scenario: Secondary-side voltage sensing in AC/DC adapters and telecom power supplies with optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt reference generating precise error signal for optocoupler LED drive. Use Value: Enables ±1% output regulation without primary-side sensing; eliminates need for multiple fixed Zeners. |
Use Scenario: Precision voltage clamping and threshold detection in battery management and power sequencing circuits. IC Role / Device Role / Timing Role: Programmable shunt regulator replacing discrete 2.5 V Zener diodes with tighter tolerance and lower drift. Use Value: Reduces BOM count and improves long-term stability versus standard Zeners with ±5% tolerance. |
| Voltage Monitoring Circuit | Comparator with Integrated Reference |
Use Scenario: Undervoltage lockout (UVLO) and overvoltage protection (OVP) in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Stable reference source for comparator input, triggering shutdown when supply deviates from setpoint. Use Value: Eliminates external reference IC; 14 mV temp drift ensures consistent trip points across operating temperature. |
Use Scenario: Threshold detection in analog sensor interfaces and power-good signaling for microcontrollers. IC Role / Device Role / Timing Role: Combines reference and comparator input stage - REF pin compares against external voltage divider. Use Value: Reduces component count by integrating reference and comparison function in single 3-pin device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR | Same electrical specs, identical SOT-23-3 package, but non-tape-and-reel (bulk) packaging | No functional difference; suitable for prototyping or low-volume manual assembly | Select TL431BIDBVRE4 for automated SMT production; TL431BIDBVR for hand-solder evaluation |
| TL431CDBVR | Same SOT-23-3 package, but C-temp grade (0°C to 70°C) and 2% initial tolerance (standard grade) | Limited to commercial-temperature applications; higher Vref drift (6 mV max) but lower cost | Choose TL431CDBVR only if ambient stays within 0–70°C and ±2% reference accuracy suffices |
Compared with TL431BIDBVRE4, TL431BIDBVR offers identical performance in bulk form for lab use, while TL431CDBVR trades industrial temperature range and precision for cost savings in benign environments - neither is pin-compatible drop-in replacement for automotive or extended industrial use.
Availability
TL431BIDBVRE4 is available at Aetrix Electronics and suitable for isolated power supplies, voltage monitoring systems, and precision analog feedback loops requiring stable component supply across industrial temperature ranges.
Supply support for TL431BIDBVRE4 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 leader specializing in analog, embedded processing, and power management technologies, with decades of experience in precision reference design.
The TL431 product line was engineered for high-accuracy, low-drift shunt regulation in power supply feedback, voltage supervision, and analog signal conditioning - targeting industrial, telecom, and computing applications.
FAQ
What is the reference voltage tolerance of TL431BIDBVRE4 at 25°C?
The TL431BIDBVRE4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.483–2.507 V range. This B-grade specification is confirmed in Section 7.11 of the TI SLVS543P datasheet and applies specifically to the TL431BIDBVRE4 variant with I-temp rating and SOT-23-3 (DBV) package.
Does TL431BIDBVRE4 support operation across the full industrial temperature range?
Yes, TL431BIDBVRE4 is rated for operation from −40°C to +85°C (I-temp grade). Its reference voltage deviation is specified at 14 mV maximum over this range, and all electrical characteristics in Section 7.12 of the datasheet are validated for this temperature span.
What is the dynamic impedance of TL431BIDBVRE4 and why does it matter?
The TL431BIDBVRE4 has a typical dynamic impedance of 0.2 Ω, measured at frequencies ≤1 kHz with cathode current between 1 mA and 100 mA. This low value ensures minimal output voltage perturbation under varying load or noise, critical for stable feedback in switching power supplies.
Can TL431BIDBVRE4 replace a Zener diode in a 3.3 V regulation circuit?
Yes, TL431BIDBVRE4 can replace a Zener diode in a 3.3 V circuit using two external resistors (e.g., R1 = 10 kΩ, R2 = 27 kΩ) to set the output. Its 0.5% tolerance, low drift, and sharp turn-on provide superior accuracy and stability compared to standard Zeners, especially under temperature variation.
What are the absolute maximum ratings for cathode voltage and current in TL431BIDBVRE4?
The absolute maximum cathode voltage (VKA) for TL431BIDBVRE4 is 37 V, and the continuous cathode current (IKA) range is −100 mA to +150 mA. These limits are defined in Section 7.1 of the SLVS543P datasheet and apply to the SOT-23-3 package under recommended thermal conditions.
TL431BIDBVRE4 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:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431BIDBVRE4 FAQ
1.How can I place an order for TL431BIDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDBVRE4 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 TL431BIDBVRE4 reliable?
The price and inventory of TL431BIDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDBVRE4 is usually 5 days.
3.What payment methods are accepted for TL431BIDBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDBVRE4?
TL431BIDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDBVRE4 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 TL431BIDBVRE4?
For technical support, including TL431BIDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDBVRE4 requirements.
6.How does Aetrix verify that TL431BIDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDBVRE4 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 TL431BIDBVRE4 meets industry standards.
7.What is the process for return or replacement of TL431BIDBVRE4?
All TL431BIDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDBVRE4, 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 TL431BIDBVRE4 part is unused and in its original packaging.
Return procedure for TL431BIDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDBVRE4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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