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Texas Instruments TL431BIDBVT
- Part No.:
- TL431BIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TL431BIDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:606
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Product details
Overview
TL431BIDBVT 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 TL431BIDBVT datasheet, TL431BIDBVT pinout, TL431BIDBVT application, or TL431BIDBVT equivalent, key selection criteria include reference accuracy over temperature, cathode current capability, thermal stability in high-reliability power regulation, and compatibility with optocoupler-based feedback networks in flyback converters.
Technical Context
The TL431BIDBVT implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when the divider ratio exceeds VREF ≈ 2.495 V.
It operates as a high-gain, low-impedance active Zener replacement: dynamic impedance remains stable at 0.2 Ω (typ) up to 100 kHz, and temperature drift is bounded to ±14 mV over −40°C to 125°C (Q-grade), enabling stable closed-loop regulation without external compensation in many SMPS designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (typ), ±0.5% initial tolerance at 25°C - enables precise output setting in adjustable power supplies |
| Operating Temperature | −40°C to +125°C - qualified for automotive and industrial environments requiring extended thermal range |
| Dynamic Impedance | 0.2 Ω (typ) at 1–100 mA - ensures minimal output voltage variation under load transients |
| Cathode Current Range | 1 mA to 100 mA - supports direct drive of optocoupler LEDs and discrete pass devices |
| Reference Input Current | 2–4 µA (typ) - allows high-impedance resistor dividers without significant loading error |
| Temperature Drift | ±14 mV max over full range - guarantees <0.06%/°C effective TC for stable long-term regulation |
| Output Noise | Low broadband noise (<10 µVRMS over 10 Hz–10 kHz) - critical for low-noise analog references and sensing |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Three-terminal configuration with no internal connections beyond functional pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode | Shunt current output node | Connects to primary-side switch node or optocoupler anode; sinks regulated current to maintain VREF at divider junction |
| Pin 2: Anode | Common return/reference ground | Typically tied to system ground or secondary-side return; serves as voltage reference point for REF input |
| Pin 3: Ref | High-impedance reference sense input | Monitors voltage divider output; triggers regulation when VREF ≥ 2.495 V relative to ANODE |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% reference accuracy (B grade) | Enables ±1% output voltage tolerance in well-designed feedback networks without trimming |
| 0.2 Ω dynamic impedance | Maintains tight regulation during rapid load steps, reducing need for large output capacitance |
| −40°C to +125°C operation (Q-temp) | Validated for under-hood automotive and industrial motor drive applications with wide ambient swings |
| Low 2–4 µA reference input current | Permits use of >1 MΩ divider resistors, minimizing quiescent power and thermal drift effects |
| Stable with capacitive loads up to 10 nF | Supports direct connection to optocoupler input without phase-margin degradation in isolated SMPS |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/50 A telecom rectifier modules. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler-coupled feedback loop, setting output voltage via resistor divider. Use Value: 0.5% initial accuracy and ±14 mV temp drift ensure output stays within ±1.5% over full thermal range without recalibration. |
Use Scenario: Output voltage stabilization in DIN-rail mounted 24 V/20 A industrial power supply. IC Role / Device Role / Timing Role: Adjustable shunt regulator controlling TL431BIDBVT-based error amplifier driving PWM controller. Use Value: 1–100 mA cathode current range directly drives PC817 optocoupler LED, eliminating buffer transistor. |
| AC Inverter Drive | Notebook PC Adapter |
Use Scenario: Auxiliary rail regulation (±15 V) for gate driver ICs in 3-phase IGBT inverters. IC Role / Device Role / Timing Role: Dual-rail reference generator using two TL431BIDBVT units with mirrored dividers. Use Value: Matched 0.2 Ω impedance and low noise ensure symmetrical rail tracking and minimal gate drive jitter. |
Use Scenario: Feedback reference in compact 19 V/3.42 A flyback adapter with QR controller. IC Role / Device Role / Timing Role: Primary-side referenced shunt regulator interfacing with Y-cap coupled feedback network. Use Value: SOT-23-3 footprint and low 4 µA input current reduce board area and standby power below 75 mW. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVR | SOT-23-5 package; REF/ANODE/CATHODE pinout differs (Pin 1=REF, Pin 2=ANODE, Pin 3=NC, Pin 4=CATHODE, Pin 5=NC) | Requires PCB layout change; not pin-compatible; higher thermal resistance (RθJA = 206°C/W vs 206°C/W same, but different internal routing) | Select only if SOT-23-5 footprint is standardized and pinout redesign is acceptable |
| AS431BIZTR-G1 | 0.5% tolerance, −40°C to 125°C, but higher 10 µA max IREF and 0.5 Ω min ZKA | Higher reference current increases divider power loss; higher impedance degrades transient response in high-bandwidth loops | Acceptable for cost-sensitive, non-critical applications where 1% output tolerance is sufficient |
Compared with TL431BIDBVT, TL431BQDBVR demands layout revision due to incompatible pinout, while AS431BIZTR-G1 trades tighter thermal specs for looser electrical performance-making TL431BIDBVT optimal for space-constrained, high-accuracy industrial power feedback.
Availability
TL431BIDBVT is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and AC inverter drives requiring stable component supply with guaranteed long-term manufacturability and Q-grade temperature qualification.
Supply support for TL431BIDBVT 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 heritage in precision reference design.
The TL431 product line was engineered for high-accuracy, low-drift voltage regulation in isolated power supplies and industrial control systems-prioritizing thermal stability, sink-current robustness, and ease of integration into feedback networks.
FAQ
What is the reference voltage tolerance of TL431BIDBVT at 25°C?
The TL431BIDBVT has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal 2.495 V output with a guaranteed range of 2.483 V to 2.507 V. This B-grade accuracy is specified in TI's SLVS543S datasheet Section 6.11 and enables high-precision output regulation without post-production trimming. The TL431BIDBVT maintains this tolerance across its full operating temperature range when used within recommended conditions.
Does TL431BIDBVT support operation at 125°C?
Yes, TL431BIDBVT is rated for operation from −40°C to +125°C, as confirmed by its "Q" temperature grade designation in the device nomenclature and Section 6.13 of the TI datasheet. It meets all electrical specifications-including reference voltage deviation (±14 mV max) and dynamic impedance (0.2 Ω typ)-within this extended range, making it suitable for under-hood automotive and high-temperature industrial applications.
What is the maximum cathode current supported by TL431BIDBVT?
The TL431BIDBVT supports a continuous cathode current range of 1 mA to 100 mA per Section 6.4 of the TI datasheet. Absolute maximum rating allows 150 mA briefly, but sustained operation above 100 mA requires thermal derating based on RθJA = 206°C/W. At 100 mA and 25°C ambient, junction temperature reaches ~130°C-within safe limits but approaching the 150°C absolute max.
How does the pinout of TL431BIDBVT differ from TL432 variants?
TL431BIDBVT uses the standard TL431 SOT-23-3 pinout: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Ref. TL432 variants (e.g., TL432BIDBVT) reverse this: Pin 1 = Cathode, Pin 2 = Ref, Pin 3 = Anode. This difference is explicitly documented in TI's Device Comparison Table and Pin Configuration section-TL431BIDBVT is not pin-compatible with any TL432 variant, and substitution requires PCB modification.
Can TL431BIDBVT replace a Zener diode in linear regulator designs?
Yes, TL431BIDBVT is specifically designed as a superior Zener diode replacement: it offers sharp turn-on characteristics, 0.2 Ω dynamic impedance (vs multi-ohm Zener impedance), and adjustable output from 2.495 V to 36 V using two external resistors. Unlike Zeners, TL431BIDBVT provides stable regulation down to 1 mA cathode current and exhibits far lower temperature drift-making it ideal for precision shunt regulators and series-pass control circuits.
TL431BIDBVT 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:
- ±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
TL431BIDBVT FAQ
1.How can I place an order for TL431BIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDBVT 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 TL431BIDBVT reliable?
The price and inventory of TL431BIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDBVT is usually 5 days.
3.What payment methods are accepted for TL431BIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDBVT?
TL431BIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDBVT 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 TL431BIDBVT?
For technical support, including TL431BIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDBVT requirements.
6.How does Aetrix verify that TL431BIDBVT is sourced from the original manufacturer or authorized distributors?
All TL431BIDBVT 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 TL431BIDBVT meets industry standards.
7.What is the process for return or replacement of TL431BIDBVT?
All TL431BIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDBVT, 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 TL431BIDBVT part is unused and in its original packaging.
Return procedure for TL431BIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDBVT 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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