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Texas Instruments TLV431ACDBVT
- Part No.:
- TLV431ACDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV431ACDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:371
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Product details
Overview
TLV431ACDBVT from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±1% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, 80 µA typical minimum cathode current, and operation from 1.24 V to 6 V output range. It serves as a Zener replacement or error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLV431ACDBVT datasheet, TLV431ACDBVT pinout, TLV431ACDBVT application, or TLV431ACDBVT equivalent, this page delivers verified electrical parameters, SC-70 package details, functional mode distinctions (open-loop comparator vs closed-loop shunt regulation), thermal performance data, and real-world design implications for secondary-side voltage monitoring and regulation.
Technical Context
The TLV431ACDBVT implements an internally compensated NPN-based shunt regulator architecture with integrated 1.24 V bandgap reference and high-gain error amplifier. Its open-loop operation enables precise voltage threshold detection, while closed-loop configuration-using external resistive feedback between cathode and reference pins-enables stable adjustable voltage regulation without requiring an output capacitor.
It operates across –40°C to 85°C (TLV431AI grade), supports cathode voltages from 1.24 V to 6 V, maintains 4 mV reference drift over 0°C–70°C, and exhibits ultra-low 0.1–0.5 µA reference terminal current-critical for high-impedance sensing and battery-powered monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1% at 25°C - sets minimum regulation point and defines feedback divider ratio baseline |
| Output Voltage Range | 1.24 V to 6 V - adjustable via two external resistors; enables direct compatibility with 3.3 V, 5 V, and 12 V rails |
| Dynamic Impedance | 0.25 Ω typical - ensures tight regulation under load transients; lower than TL431 (≈0.5 Ω) |
| Min Cathode Current (IK(min)) | 80 µA typical - enables operation in ultra-low-power applications where supply current must stay below 100 µA |
| Reference Terminal Current | 0.15–0.5 µA - allows use with >1 MΩ feedback dividers without significant voltage error |
| Temp Drift (0°C to 70°C) | 4 mV - translates to ≈33 ppm/°C stability; suitable for industrial-grade voltage monitoring |
| ESD Rating (HBM) | ±2000 V - meets standard handling requirements for board-level assembly without special precautions |
Pinout & Package
TLV431ACDBVT uses the SC-70 (DCK) 6-pin package (2.0 mm × 1.5 mm), with pin 1 = CATHODE, pin 3 = REF, pin 6 = ANODE. Pin 2 is substrate-connected and must be tied to ANODE or left floating; pins 4 and 5 are NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current sink input | Primary current path; connects to regulated rail or optocoupler LED anode in isolated SMPS |
| REF (Pin 3) | Reference voltage sense input | High-impedance node; voltage at this pin is compared to internal 1.24 V reference |
| ANODE (Pin 6) | Common return path | Typically grounded; forms reference potential for cathode-to-anode voltage (VKA) |
| Substrate (Pin 2) | Die backside connection | Must be connected to ANODE or left unconnected; not electrically active otherwise |
| NC (Pins 4, 5) | No internal connection | Unused; no routing or termination required on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 (2.5 V) cannot function |
| Ultra-small SC-70 footprint | 2.0 mm × 1.5 mm - 40% smaller than SOT-23-3; saves board space in compact power modules and IoT sensors |
| Integrated reference + amplifier | Single-device comparator functionality - eliminates need for external reference IC and op-amp in voltage monitor designs |
| Stable without output capacitor | Internally compensated - removes capacitor selection complexity and avoids instability risks in high-ESR or ceramic-capacitor layouts |
| Zener diode replacement | Sharp turn-on characteristic and 0.25 Ω impedance - provides superior regulation accuracy and transient response vs discrete Zeners |
Applications
| Adjustable Voltage Reference | Isolated Flyback SMPS Regulation |
|---|---|
|
Use Scenario: Generating a stable, user-adjustable reference voltage for ADC biasing, DAC output scaling, or sensor excitation in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt regulator configured in closed-loop mode with external resistor divider to set exact output voltage. Use Value: Delivers 1.24–6 V output with ±1% initial accuracy and <4 mV drift over 0°C–70°C-enabling 12-bit system accuracy without calibration. |
Use Scenario: Secondary-side voltage sensing and error amplification in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and reference combined; compares output-derived voltage against internal 1.24 V and drives optocoupler LED current. Use Value: Enables regulation down to ~2.7 V output (1.24 V + opto VF), supporting modern low-voltage DC/DC topologies with tight cross-regulation. |
| Voltage Monitoring & Threshold Detection | Zener Diode Replacement |
|
Use Scenario: Monitoring battery voltage in wearables or medical devices to trigger low-battery alerts or shutdown sequences. IC Role / Device Role / Timing Role: Open-loop comparator with integrated reference; REF pin biased by resistive divider from monitored rail. Use Value: Eliminates external reference and comparator IC; achieves fast, accurate trip points with only one passive component (divider resistor). |
Use Scenario: Replacing discrete 2.5 V or 3.3 V Zener diodes in LDO feedback paths or overvoltage clamps on microcontroller I/O lines. IC Role / Device Role / Timing Role: Adjustable shunt element providing sharp knee and low dynamic impedance instead of fixed-voltage Zener. Use Value: Reduces voltage error under varying load (due to 0.25 Ω zKA vs Zener's >10 Ω), improves temperature stability, and enables fine-tuned clamp thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDBVT | 0.5% initial VREF tolerance (vs 1%); same SC-70 package and electrical specs | Better accuracy needed for high-resolution measurement or precision power sequencing | Select when ±0.5% reference tolerance is required; otherwise TLV431ACDBVT offers optimal cost/accuracy balance |
| TLVH431ACDBVR | Wider VKA range (1.24–18 V); SOT-23-3 package; higher 80 mA cathode current rating | Required for >6 V regulation or higher-current shunt applications (e.g., 12 V/24 V industrial supplies) | Choose TLVH431ACDBVR only if output voltage exceeds 6 V or cathode current >15 mA is needed; TLV431ACDBVT is preferred for ≤6 V, low-IK designs |
Compared with TLV431BIDBVT, TLV431ACDBVT trades 0.5% accuracy for lower cost and broader availability; compared with TLVH431ACDBVR, it offers tighter thermal drift and lower quiescent current but limits max VKA to 6 V-making TLV431ACDBVT ideal for compact, low-voltage, cost-sensitive regulation where 1% tolerance suffices.
Availability
TLV431ACDBVT is available at Aetrix Electronics and suitable for isolated flyback SMPS regulation, battery voltage monitoring, and precision adjustable reference generation requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for TLV431ACDBVT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.
The TLV431 family was designed specifically as a low-voltage, low-power alternative to the TL431, targeting energy-efficient power management, compact isolated converters, and precision analog monitoring in space-constrained systems.
FAQ
What is the operating temperature range for TLV431ACDBVT?
The TLV431ACDBVT is rated for operation from –40°C to +85°C (industrial grade, denoted by 'I' suffix). Its reference voltage drift is specified at 6 mV over this full range, and minimum cathode current remains ≤100 µA across temperature-ensuring reliable regulation in demanding environments without derating.
Can TLV431ACDBVT replace a standard Zener diode in my circuit?
Yes, TLV431ACDBVT can directly replace Zener diodes in most shunt regulation and voltage-clamp applications. Its 0.25 Ω dynamic impedance, sharp turn-on, and adjustable 1.24–6 V output provide superior accuracy and stability versus fixed-voltage Zeners-especially under varying load or temperature conditions.
Does TLV431ACDBVT require an output capacitor for stability?
No, TLV431ACDBVT is internally compensated and stable without an output capacitor between cathode and anode. This simplifies layout and eliminates capacitor-related instability risks. However, if an output capacitor is used for filtering, Figure 5-19 in the datasheet provides phase-margin guidance for selecting appropriate values.
How do I configure TLV431ACDBVT as a 3.3 V shunt regulator?
To set TLV431ACDBVT to 3.3 V, connect a resistor divider between cathode and anode, with the junction tied to REF. Use R1 (cathode-to-REF) and R2 (REF-to-anode): R1/R2 = (3.3 V / 1.24 V) – 1 ≈ 1.66. For example, R1 = 10 kΩ and R2 = 6.02 kΩ yields nominal 3.3 V output with <0.5% error from resistor tolerance.
What is the maximum cathode voltage (VKA) rating for TLV431ACDBVT?
The absolute maximum cathode-to-anode voltage (VKA) for TLV431ACDBVT is 7 V. The recommended operating range is 1.24 V to 6 V. Exceeding 7 V risks permanent damage; operation above 6 V is outside specification and may degrade reference accuracy or increase drift.
TLV431ACDBVT 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):
- 1.24V
- Voltage - Output (Max):
- 6 V
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLV431ACDBVT FAQ
1.How can I place an order for TLV431ACDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431ACDBVT 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 TLV431ACDBVT reliable?
The price and inventory of TLV431ACDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431ACDBVT is usually 5 days.
3.What payment methods are accepted for TLV431ACDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV431ACDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV431ACDBVT?
TLV431ACDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431ACDBVT 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 TLV431ACDBVT?
For technical support, including TLV431ACDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431ACDBVT requirements.
6.How does Aetrix verify that TLV431ACDBVT is sourced from the original manufacturer or authorized distributors?
All TLV431ACDBVT 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 TLV431ACDBVT meets industry standards.
7.What is the process for return or replacement of TLV431ACDBVT?
All TLV431ACDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TLV431ACDBVT, 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 TLV431ACDBVT part is unused and in its original packaging.
Return procedure for TLV431ACDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431ACDBVT Tags
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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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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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