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Texas Instruments TL431ACDBVT
- Part No.:
- TL431ACDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431ACDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,250
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Product details
Overview
TL431ACDBVT 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 at 25°C, 1 mA–100 mA sink-current capability, and operation across −40°C to 85°C. It replaces Zener diodes in adjustable power supplies, isolated feedback loops, and industrial AC/DC converters.
For engineers reviewing the TL431ACDBVT datasheet, TL431ACDBVT pinout, TL431ACDBVT application, or TL431ACDBVT equivalent, this page provides verified electrical specs, thermal behavior, stability boundaries, noise performance, and real-world implementation guidance for feedback regulation design.
Technical Context
The TL431ACDBVT implements a high-gain transconductance amplifier with internal 2.495 V bandgap reference, driving an NPN output stage to regulate cathode-to-anode voltage via external resistor divider. Its sharp turn-on characteristic and 0.2 Ω dynamic impedance enable stable closed-loop control in switching power supply feedback paths.
It operates as a three-terminal adjustable shunt regulator: REF pin senses divided output voltage, CATHODE sinks current to adjust system output, and ANODE serves as common return. The A-grade (1%) and C-temp (0°C–70°C) variants are distinct-this part is A-grade with I-temp rating (−40°C to 85°C), confirmed by suffix 'I' in full TI ordering code TL431AI DBVT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.47–2.52 V range at 25°C); sets precise feedback threshold for output regulation. |
| Initial Tolerance | ±1% at 25°C (A grade); enables accurate output setting without post-manufacturing trimming. |
| Temperature Range | −40°C to +85°C (I grade); supports industrial and embedded power applications with wide ambient variation. |
| Sink Current Range | 1 mA to 100 mA; sufficient to drive optocoupler LEDs or error amplifier inputs in isolated SMPS designs. |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); ensures minimal output voltage perturbation under load transients. |
| Reference Input Current | 2–4 µA; low bias current minimizes divider network error and power loss in high-impedance feedback networks. |
| Output Noise | Low broadband noise (typ. 220 nV/√Hz at 1 kHz); critical for low-noise analog references and precision ADC references. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, RoHS-compliant, with gull-wing leads. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode (K) | Current sink node | Connects to switched-node side of optocoupler or feedback divider; carries full regulation current. |
| Pin 2: Reference (REF) | High-impedance sense input | Monitors voltage divider output; 2–4 µA input current requires careful R1/R2 selection to limit error. |
| Pin 3: Anode (A) | Common return path | Typically tied to system ground or power supply return; must be low-impedance for stable regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.495 V to 36 V via two external resistors-enables flexible feedback design without discrete Zener selection. |
| Low temperature drift | ≤14 mV over −40°C to +85°C (I grade)-ensures <0.05% output variation across full operating range. |
| Sharp turn-on characteristic | Fast response with <1 µs pulse rise time-prevents overshoot during line/load transients in SMPS feedback loops. |
| Stability boundary defined | Published CL vs. IKA stability curves (Fig 6-18)-allows reliable compensation without iterative bench testing. |
| Low output noise | 220 nV/√Hz @ 1 kHz-supports high-resolution analog sensing and low-jitter clock generation when used in LDO references. |
Applications
| Industrial AC/DC Power Supply | Rack Server VRM Feedback |
|---|---|
Use Scenario: Primary-side regulation in 300–500 W telecom rectifiers with optocoupler-isolated feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold to drive PC817 optocoupler LED. Use Value: Enables ±1% output voltage accuracy over line, load, and temperature-meeting IEC 62368-1 hold-up and ripple requirements. |
Use Scenario: Secondary-side voltage monitoring in multiphase CPU VRMs for dynamic VID adjustment. IC Role / Device Role / Timing Role: Precision reference for DAC-controlled feedback divider in digital PWM controllers. Use Value: 1% initial tolerance and 14 mV temp drift ensure stable core voltage within ±10 mV across 0–85°C ambient. |
| AC Inverter Motor Control | Servo Drive Power Stage Monitoring |
Use Scenario: DC bus voltage scaling and overvoltage protection in 3-phase 220 V inverters. IC Role / Device Role / Timing Role: High-voltage reference input to comparator for fast OVP shutdown. Use Value: 36 V max cathode voltage rating allows direct connection to 300 V DC bus via resistive divider-no level-shifting needed. |
Use Scenario: Isolated current-sense amplifier reference in servo motor gate driver power rails. IC Role / Device Role / Timing Role: Stable 2.495 V bias for op-amp-based shunt measurement circuits. Use Value: 0.2 Ω dynamic impedance prevents gain error drift during high-frequency PWM switching (up to 20 kHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVT | 0°C–70°C temp range (C grade), same 1% tolerance and SOT-23-3 package. | Not rated for −40°C startup; unsuitable for outdoor or unheated industrial enclosures. | Select only if ambient stays above 0°C and cost sensitivity outweighs reliability margin. |
| TL431BIDBVT | 0.5% initial tolerance (B grade), identical −40°C to +85°C rating and pinout. | Higher accuracy enables tighter output regulation but increases cost ~12%. | Choose when system-level output spec demands ≤±0.5% total error budget including divider and op-amp errors. |
Compared with TL431CDBVT and TL431BIDBVT, the TL431ACDBVT offers the optimal balance of industrial temperature support, 1% accuracy, and cost-making it the default choice for commercial/industrial power supplies where ±1% output tolerance is acceptable and −40°C operation is required.
Availability
TL431ACDBVT is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, rack server VRMs, and servo drive control modules requiring stable component supply and long-term production continuity.
Supply support for TL431ACDBVT 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 and power control technologies.
The TL431 product line was designed specifically for high-reliability voltage regulation in switching power supplies, offering Zener replacement functionality with superior accuracy, temperature stability, and sink-current capability.
FAQ
What is the maximum cathode voltage rating for TL431ACDBVT?
The absolute maximum cathode-to-anode voltage for TL431ACDBVT is 37 V. Continuous operation is specified up to 36 V, making it suitable for use with 24 V, 32 V, and 36 V nominal systems when properly derated per thermal limits. Exceeding 37 V risks permanent damage per TI's Absolute Maximum Ratings table.
Does TL431ACDBVT require an external capacitor for stability?
TL431ACDBVT does not require a mandatory external capacitor, but stability depends on load capacitance and cathode current. Figure 6-18 in the datasheet defines safe CL vs. IKA operating regions-capacitors >100 nF may cause oscillation unless current is >10 mA. A 1 nF ceramic capacitor is commonly used across REF–ANODE for noise immunity without compromising stability.
Can TL431ACDBVT replace a standard 2.5 V Zener diode directly?
Yes-TL431ACDBVT can directly replace a 2.5 V Zener in most shunt regulator applications, but requires two external resistors to set the reference point and a minimum 1 mA cathode current for regulation. Unlike Zeners, it provides sharper knee characteristics, lower dynamic impedance (0.2 Ω vs. 10–100 Ω), and guaranteed 1% accuracy over temperature.
What is the typical reference input current for TL431ACDBVT?
The typical reference input current for TL431ACDBVT is 2–4 µA at 25°C, with deviation ≤1.2 µA over −40°C to +85°C. This low bias current enables high-value feedback dividers (e.g., 1 MΩ top resistor), reducing power loss while maintaining accuracy-critical in energy-sensitive industrial power designs.
Is TL431ACDBVT pin-compatible with TL432 series devices?
No-TL431ACDBVT (SOT-23-3) has REF–CATHODE–ANODE pinout, while TL432DBZ uses CATHODE–REF–ANODE. Swapping them causes immediate circuit failure. Always verify pin configuration using TI's Pin Configuration and Functions section (page 4 of SLVS543S) before board layout or replacement.
TL431ACDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TL431ACDBVT FAQ
1.How can I place an order for TL431ACDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACDBVT 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 TL431ACDBVT reliable?
The price and inventory of TL431ACDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACDBVT is usually 5 days.
3.What payment methods are accepted for TL431ACDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACDBVT?
TL431ACDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACDBVT 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 TL431ACDBVT?
For technical support, including TL431ACDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACDBVT requirements.
6.How does Aetrix verify that TL431ACDBVT is sourced from the original manufacturer or authorized distributors?
All TL431ACDBVT 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 TL431ACDBVT meets industry standards.
7.What is the process for return or replacement of TL431ACDBVT?
All TL431ACDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACDBVT, 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 TL431ACDBVT part is unused and in its original packaging.
Return procedure for TL431ACDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ACDBVT 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
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