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Texas Instruments TL431AIDBVRE4
- Part No.:
- TL431AIDBVRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431AIDBVRE4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,131
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Product details
Overview
TL431AIDBVRE4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current, widely used in feedback loops of isolated DC/DC converters and AC/DC power supplies.
For engineers reviewing the TL431AIDBVRE4 datasheet, TL431AIDBVRE4 pinout, TL431AIDBVRE4 application, or TL431AIDBVRE4 equivalent, this page provides verified electrical specifications, thermal behavior, stability boundaries, real-world application context, and validated alternative options for industrial power design and embedded regulation.
Technical Context
The TL431AIDBVRE4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference, error amplifier, and NPN output stage. Its sharp turn-on characteristic and low output impedance enable Zener diode replacement in closed-loop regulation without external compensation in many cases.
It operates as a two-quadrant device: the cathode sinks current when the reference pin voltage exceeds 2.495 V, and enters high-impedance off-state below that threshold. Stability depends on load capacitance and cathode current-oscillation risk increases above 10 µF at low IKA, per TI's published boundary curves for SOT-23-3 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 2.470–2.520 V at 25°C (1% A-grade tolerance); sets minimum regulated output in feedback divider networks. |
| Temperature Range | −40°C to +85°C (I-grade); ensures stable operation in industrial AC/DC and servo drive environments. |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); enables tight regulation under fast load transients without external bypassing. |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocoupler LEDs and discrete transistor bases in isolated feedback paths. |
| Reference Input Current | 2–4 µA typical; permits high-impedance resistor dividers (e.g., 1 MΩ top resistor) without significant error. |
| Output Noise | Low broadband noise (<20 µVRMS over 10 Hz–10 kHz); critical for low-noise analog references and precision ADC biasing. |
| Thermal Drift (VIdev) | 14–34 mV over full temperature range (I-grade); translates to ±0.014% to ±0.034% output variation across operating range. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free and RoHS-compliant. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference (REF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink node | Connects to switched node or optocoupler anode; carries full regulation current; voltage must stay ≤36 V relative to Anode. |
| Anode (Pin 2) | Common return path | Typically tied to system ground or negative rail; serves as voltage reference point for all internal measurements. |
| Reference (Pin 3) | Threshold input | Compares against internal 2.495 V bandgap; controls conduction via external resistor divider; draws only nanoamps. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 2.495 V to 36 V via two-resistor divider - eliminates need for multiple fixed-voltage references. |
| Sharp turn-on characteristic | Sub-100 mV transition bandwidth enables clean switching between regulation and cutoff - reduces output ripple in SMPS feedback. |
| Low output impedance | 0.2 Ω typical - maintains regulation accuracy even with 10–20 mA step-load changes without added capacitance. |
| Wide temperature stability | 14 mV max deviation over −40°C to +85°C - suitable for unheated industrial enclosures and outdoor power systems. |
| High ESD robustness | ±2000 V HBM - withstands handling and board-level assembly without special precautions. |
Applications
| AC/DC Power Adapter Feedback | Rack Server VRM Monitoring |
|---|---|
Use Scenario: Secondary-side voltage sensing in flyback or forward converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to control optocoupler LED current and regulate primary-side PWM duty cycle. Use Value: Enables ±1% output voltage accuracy across line/load/temperature without trimming, reducing BOM count vs. Zener-based solutions. |
Use Scenario: Remote sense and overvoltage protection in multi-phase CPU/GPU VRMs. IC Role / Device Role / Timing Role: Precision reference for comparator inputs monitoring 12 V, 5 V, or 3.3 V rails in real time. Use Value: Detects overvoltage events within 100 ns due to low propagation delay and sharp knee - prevents processor damage during transient faults. |
| Industrial Servo Drive Control | AC Inverter DC Bus Regulation |
Use Scenario: Isolated feedback for auxiliary 15 V or 24 V control supply powering gate drivers and logic. IC Role / Device Role / Timing Role: Programmable shunt regulator setting stable local bias voltage independent of main DC bus fluctuations. Use Value: Maintains <1% regulation over −40°C to +85°C ambient - ensures consistent gate drive strength and encoder interface reliability. |
Use Scenario: Mid-rail voltage reference in three-level NPC inverters for balanced capacitor voltage balancing. IC Role / Device Role / Timing Role: High-accuracy midpoint reference feeding differential amplifiers that monitor upper/lower DC link capacitors. Use Value: 14 mV max temp drift prevents false imbalance detection during thermal cycling - extends inverter lifetime in HVAC and pump drives. |
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°C to 70°C operating range; same 1% tolerance but narrower temp grade. | Limited to commercial-temperature environments (e.g., consumer adapters); not rated for industrial ambient extremes. | Select when cost sensitivity outweighs extended temperature needs and ambient stays <70°C. |
| TL431BIDBVRE4 | 0.5% initial tolerance (B-grade); identical SOT-23-3 package and I-grade temp range. | Higher accuracy required for metrology-grade supplies or precision DAC references where 0.5% matters. | Choose when tighter initial VREF tolerance justifies modest cost increase and layout remains unchanged. |
Compared with TL431AIDBVRE4, TL431CDBVR trades temperature range for lower cost in benign environments, while TL431BIDBVRE4 improves initial accuracy without altering footprint or thermal behavior - enabling drop-in upgrades where precision is prioritized.
Availability
TL431AIDBVRE4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and AC inverter & VF drive applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TL431AIDBVRE4 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 ICs, with decades of expertise in precision reference design and industrial-grade reliability.
The TL431 product line was engineered for high-stability, low-drift voltage regulation in isolated power feedback, battery management, and safety-critical industrial control systems - emphasizing thermal robustness and long-term parametric consistency.
FAQ
What is the reference voltage tolerance of TL431AIDBVRE4 at 25°C?
The TL431AIDBVRE4 has a 1% initial reference voltage tolerance at 25°C, meaning its VREF falls between 2.470 V and 2.520 V under nominal conditions. This A-grade specification is confirmed in TI's SLVS543S datasheet Section 6.8 and applies specifically to the I-grade (−40°C to +85°C) variant in SOT-23-3 packaging. The TL431AIDBVRE4 maintains this tolerance without calibration or trimming.
Can TL431AIDBVRE4 replace a Zener diode in a linear regulator circuit?
Yes, the TL431AIDBVRE4 can directly replace Zener diodes in shunt regulator configurations, offering superior performance: sharper knee voltage, lower dynamic impedance (0.2 Ω vs. typical Zener's 5–20 Ω), and adjustable output from 2.495 V to 36 V using two resistors. Unlike Zeners, TL431AIDBVRE4 exhibits minimal temperature drift and predictable turn-on behavior - making it ideal for precision feedback paths where Zener leakage or voltage spread compromises regulation.
What is the maximum cathode voltage rating for TL431AIDBVRE4?
The absolute maximum cathode-to-anode voltage (VK-A) for TL431AIDBVRE4 is 37 V, with recommended operation up to 36 V. Exceeding 37 V risks permanent damage. This rating is defined in Section 6.1 of the TI SLVS543S datasheet and applies across the full −40°C to +85°C temperature range. Designers must ensure transient overvoltages (e.g., from inductive kickback) remain within this limit, often using clamping diodes or RC snubbers.
Does TL431AIDBVRE4 require external compensation for stability?
TL431AIDBVRE4 does not require external compensation in most standard feedback configurations, but stability depends critically on load capacitance and cathode current. Per TI's Figure 6-18, oscillation may occur with >10 µF capacitance at IKA < 5 mA. For robust operation, keep CL ≤ 1 µF when IKA < 10 mA, or add a series resistor (e.g., 10–100 Ω) between cathode and capacitive load. The TL431AIDBVRE4's internal architecture avoids phase-shift issues common in op-amp-based references.
How does the reference input current of TL431AIDBVRE4 affect resistor divider design?
The TL431AIDBVRE4 reference input current (IREF) is 2–4 µA typical at 25°C, with ≤2.5 µA deviation over temperature. This low current allows high-value resistor dividers (e.g., 1 MΩ top + 100 kΩ bottom for 12 V output) without introducing >0.1% error. However, designers must ensure total divider current exceeds 10× IREF (i.e., >40 µA) to minimize loading effects - a key advantage over higher-current references like LM4040.
TL431AIDBVRE4 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:
- ±1%
- 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
TL431AIDBVRE4 FAQ
1.How can I place an order for TL431AIDBVRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AIDBVRE4 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 TL431AIDBVRE4 reliable?
The price and inventory of TL431AIDBVRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AIDBVRE4 is usually 5 days.
3.What payment methods are accepted for TL431AIDBVRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AIDBVRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AIDBVRE4?
TL431AIDBVRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AIDBVRE4 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 TL431AIDBVRE4?
For technical support, including TL431AIDBVRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AIDBVRE4 requirements.
6.How does Aetrix verify that TL431AIDBVRE4 is sourced from the original manufacturer or authorized distributors?
All TL431AIDBVRE4 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 TL431AIDBVRE4 meets industry standards.
7.What is the process for return or replacement of TL431AIDBVRE4?
All TL431AIDBVRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AIDBVRE4, 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 TL431AIDBVRE4 part is unused and in its original packaging.
Return procedure for TL431AIDBVRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AIDBVRE4 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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