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Texas Instruments TL431IDBVRE4
- Part No.:
- TL431IDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431IDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,708
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Product details
Overview
TL431IDBVRE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 0.5% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 125°C. It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current, widely used in isolated feedback loops of AC/DC adapters and industrial power supplies.
For engineers reviewing the TL431IDBVRE4 datasheet, TL431IDBVRE4 pinout, TL431IDBVRE4 application, or TL431IDBVRE4 equivalent, key selection criteria include reference accuracy grade (B), extended temperature qualification (Q-grade), low-output-impedance stability under varying load, and compatibility with optocoupler-based secondary-side regulation architectures.
Technical Context
The TL431IDBVRE4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V bandgap reference, error amplifier, and NPN output stage. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable closed-loop regulation without external compensation in many flyback and forward converter topologies.
It operates as a voltage-controlled current sink: when the REF pin voltage exceeds 2.495 V, the cathode-anode path conducts proportionally to maintain REF at precisely Vref. The device requires no external biasing beyond two resistors setting the output voltage and is fully functional with cathode voltages up to 36 V relative to the anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (0.5% B-grade tolerance at 25°C); sets precise feedback threshold for power supply regulation |
| Temp Range | −40°C to +125°C (Q-grade); qualified for automotive and industrial environments requiring full-range stability |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage deviation under fast load transients in SMPS feedback paths |
| Sink Current Range | 1 mA to 100 mA; supports direct drive of optocoupler LEDs or discrete transistor bases without buffering |
| Ref Input Current | 2–4 µA; enables high-impedance voltage divider networks (e.g., 100 kΩ/10 kΩ) with negligible loading error |
| Output Noise | Low broadband noise; critical for minimizing jitter in tightly regulated DC outputs and analog sensing references |
| Voltage Adjustment | 2.495 V to 36 V via two external resistors; eliminates need for multiple fixed-voltage references in multi-rail systems |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Three terminals: CATHODE (pin 1), REF (pin 2), ANODE (pin 3).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Current sink output | Connects to primary-side controller feedback node or optocoupler anode; carries full regulation current |
| REF (Pin 2) | Reference input | High-impedance sense node tied to resistor divider midpoint; triggers conduction when voltage ≥2.495 V |
| ANODE (Pin 3) | Common return | Typically connected to system ground or power supply return; serves as voltage reference for REF and cathode |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Reduces output voltage calibration burden in production; enables ±1% total output tolerance without trimming |
| −40°C to +125°C Operation | Supports under-hood automotive modules and industrial motor drives where ambient extremes degrade standard references |
| 0.2 Ω Dynamic Impedance | Maintains tight regulation during rapid load steps in server PSUs and telecom rectifiers without added capacitance |
| Adjustable 2.495–36 V Output | Replaces multiple fixed Zener diodes; simplifies BOM and enables single-reference designs for variable-output converters |
| Low 2–4 µA Reference Current | Permits use of high-value resistor dividers that minimize standby power loss in energy-efficient adapters |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage feedback in 1U/2U server PSUs with digital controllers and optocouplers. IC Role / Device Role / Timing Role: Precision shunt reference generating error signal for isolated feedback loop. Use Value: Enables ±0.5% output regulation over line/load/temperature with no secondary-side LDO required. | Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/48 V industrial power supplies. IC Role / Device Role / Timing Role: Adjustable reference for linear post-regulators or switching controller feedback. Use Value: Supports wide input range (85–264 VAC) and maintains stability across −40°C to +70°C operating envelope. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and protection circuitry in variable-frequency motor drives. IC Role / Device Role / Timing Role: High-accuracy voltage threshold detector for overvoltage lockout and soft-start control. Use Value: Provides repeatable 400 V or 600 V trip points using resistor scaling, reducing component count vs. discrete comparator solutions. | Use Scenario: Isolated feedback for auxiliary 5 V/3.3 V rails powering gate drivers and position encoder interfaces. IC Role / Device Role / Timing Role: Stable reference for isolated DC-DC converter feedback in servo amplifier PCBs. Use Value: Ensures consistent logic-level supply despite EMI-rich motor drive environments and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 0.5% B-grade, but C-temp (0°C to 70°C) rating; same SOT-23-3 package and pinout | Limited to commercial-temperature applications; unsuitable for automotive or extended industrial use | Select only if ambient never exceeds 70°C and cost sensitivity outweighs long-term reliability requirements |
| TL431BQDBVR | Identical Q-grade (−40°C to 125°C) and B-grade (0.5%) specs; same SOT-23-3 package and pinout | No functional difference; differs only in TI's internal orderable part numbering convention | Valid drop-in replacement; verify packaging and reel size match production requirements |
Compared with TL431IDBVRE4, TL431CDBVR sacrifices extended temperature capability for lower cost, while TL431BQDBVR offers identical performance and qualification-making it a functionally redundant but logistically distinct alternative.
Availability
TL431IDBVRE4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431IDBVRE4 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 technologies, with leadership in power management, signal chain, and high-reliability components.
The TL431 product line delivers precision programmable shunt references for feedback, regulation, and voltage monitoring in power conversion, industrial control, and automotive systems-designed for robustness, accuracy, and broad temperature operation.
FAQ
What is the reference voltage tolerance of TL431IDBVRE4 at 25°C?
The TL431IDBVRE4 has a 0.5% initial reference voltage tolerance at 25°C, corresponding to a 2.495 V nominal reference with ±12.5 mV deviation. This B-grade accuracy is specified in TI's SLVS543S datasheet and verified across production lots. The TL431IDBVRE4 maintains this tolerance under recommended operating conditions, making it suitable for high-precision feedback applications where tighter regulation is required than standard 1% or 2% grades provide.
Does TL431IDBVRE4 support operation at −40°C to +125°C?
Yes, TL431IDBVRE4 is a Q-grade device qualified for operation from −40°C to +125°C. This extended temperature range is explicitly defined in the device nomenclature ("Q") and confirmed in Sections 6.7 and 12 of the TI SLVS543S datasheet. Its electrical characteristics-including reference voltage deviation, dynamic impedance, and sink current-are guaranteed across this full range, enabling use in under-hood automotive modules and industrial motor drives.
What is the dynamic impedance of TL431IDBVRE4 and why does it matter?
The TL431IDBVRE4 has a typical dynamic impedance of 0.2 Ω, measured at ≤1 kHz with cathode current from 1 mA to 100 mA. This low value ensures minimal output voltage variation during fast load transients in switch-mode power supply feedback loops. In practice, it allows stable regulation without large output capacitors or additional compensation, directly improving transient response and reducing design complexity in isolated DC-DC converters.
How is the output voltage adjusted on TL431IDBVRE4?
The output voltage of TL431IDBVRE4 is adjusted using two external resistors forming a voltage divider between cathode and anode, with the REF pin connected to their midpoint. The formula is VOUT = VREF × (1 + R1/R2), where VREF = 2.495 V. This configuration enables precise setting of any voltage from 2.495 V to 36 V. Resistor values must ensure REF input current (2–4 µA) does not introduce significant divider error-typically achieved with R1 + R2 ≤ 500 kΩ.
Is TL431IDBVRE4 pin-compatible with other TL431 variants in SOT-23-3?
Yes, TL431IDBVRE4 uses the standard TL431 SOT-23-3 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This matches all TL431x DBV and DBZ variants regardless of grade (A/B/standard) or temperature rating (C/I/Q). No PCB layout changes are needed when substituting within the same package-only electrical validation of accuracy and temperature performance is required for the target application.
TL431IDBVRE4 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431IDBVRE4 FAQ
1.How can I place an order for TL431IDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDBVRE4 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 TL431IDBVRE4 reliable?
The price and inventory of TL431IDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDBVRE4 is usually 5 days.
3.What payment methods are accepted for TL431IDBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDBVRE4?
TL431IDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDBVRE4 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 TL431IDBVRE4?
For technical support, including TL431IDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDBVRE4 requirements.
6.How does Aetrix verify that TL431IDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TL431IDBVRE4 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 TL431IDBVRE4 meets industry standards.
7.What is the process for return or replacement of TL431IDBVRE4?
All TL431IDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDBVRE4, 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 TL431IDBVRE4 part is unused and in its original packaging.
Return procedure for TL431IDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDBVRE4 Tags
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TL431AIDBZR
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TL431BQDBZR
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AZ431LBNTR-G1
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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
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