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Texas Instruments TL431BIDBZTG4
- Part No.:
- TL431BIDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BIDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,911
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Product details
Overview
TL431BIDBZTG4 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, 14 mV max temperature drift over −40°C to 125°C, and 0.2 Ω typical dynamic impedance - used for feedback regulation in isolated DC/DC converters and AC/DC power supplies.
For engineers reviewing the TL431BIDBZTG4 datasheet, TL431BIDBZTG4 pinout, TL431BIDBZTG4 application, or TL431BIDBZTG4 equivalent, key selection criteria include its Q-grade automotive temperature range (−40°C to 125°C), B-grade accuracy, low-noise operation, and compatibility with adjustable output configurations from 2.5 V to 36 V.
Technical Context
The TL431BIDBZTG4 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and output transistor. Its REF–ANODE–CATHODE topology enables precise voltage sensing and current sinking up to 100 mA, with sharp turn-on characteristics replacing Zener diodes in closed-loop feedback paths.
It operates across −40°C to 125°C (Q-grade), features 2 µA typical reference input current, 0.4 mA minimum cathode current for regulation, and maintains stability with load capacitance up to 1 µF under defined bias conditions - critical for flyback and forward converter compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.483–2.507 V min/max at 25°C); sets precise feedback threshold in SMPS error amplifiers. |
| Initial Tolerance | ±0.5% at 25°C (B grade); enables tight output voltage regulation without trimming in production. |
| Temp Range | −40°C to +125°C (Q grade); qualified for under-hood automotive and industrial high-temp environments. |
| Dynamic Impedance | 0.2 Ω typical; ensures stable loop response and minimal output perturbation under load transients. |
| Cathode Current | 1–100 mA sink capability; supports direct drive of optocoupler LEDs in isolated feedback circuits. |
| Ref Input Current | 2–4 µA typical; allows high-value resistor dividers (>1 MΩ) to minimize power loss in voltage sensing. |
| Temp Drift | 14 mV max deviation over full range; translates to ~12 ppm/°C average TC for stable long-term accuracy. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = REF (input), Pin 2 = CATHODE (output/sink), Pin 3 = ANODE (common return).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Reference input node | High-impedance comparator input tied to internal 2.495 V bandgap; connects to resistor divider midpoint. |
| CATHODE (Pin 2) | Current-sink output terminal | Drives external circuit (e.g., optocoupler LED); voltage at this pin regulates system output via feedback loop. |
| ANODE (Pin 3) | Common return/reference ground | Typically connected to system ground or power supply return; defines reference potential for REF and CATHODE. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 2.5 V to 36 V via two-resistor divider - enables single-part support across diverse supply rails. |
| Low output noise | Sub-20 µVPP (0.1–10 Hz); minimizes jitter in precision voltage monitoring and analog control loops. |
| Sharp turn-on characteristic | Fast transition (<1 µs rise time) between off and regulation states - improves transient response in SMPS. |
| Thermal stability | 14 mV max Vref deviation over −40°C to 125°C - eliminates need for external temperature compensation. |
| Robust ESD rating | ±2000 V HBM - withstands handling and board-level assembly without protection circuitry. |
Applications
| Rack Server Power Supply | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in isolated 48 V–12 V DC/DC modules for telecom/datacom servers. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage threshold to optocoupler-driven PWM controller. Use Value: Enables ±1% output regulation across line/load/temperature without secondary-side sensing. |
Use Scenario: Output voltage regulation in 3 kW industrial rectifier with PFC front-end. IC Role / Device Role / Timing Role: Feedback element in secondary-side error amplifier driving synchronous rectifier gate driver. Use Value: Maintains 24 V output stability under 10–100% load step while meeting IEC 61000-4-2 immunity. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitor and overvoltage protection trigger in 3-phase motor inverters. IC Role / Device Role / Timing Role: Precision reference for comparator-based OVLO circuit with hysteresis. Use Value: Accurate 750 V DC bus trip point (±0.5%) prevents false shutdown during regenerative braking spikes. |
Use Scenario: Reference source for analog current-loop interface (4–20 mA) in servo amplifier feedback path. IC Role / Device Role / Timing Role: Stable voltage reference for DAC output scaling and current-sense amplifier offset calibration. Use Value: Ensures <±0.1% current command fidelity across −40°C to 85°C ambient operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBZR | Same B-grade accuracy and Q-temp range; SOT-23-3 package, identical pinout and electrical specs. | No functional difference; alternate TI orderable part with same performance and footprint. | Select TL431BQDBZR if preferred for tape-and-reel packaging or alternate distribution channel availability. |
| AS431BQTR-G1 | ±0.5% initial tolerance, −40°C to 125°C, but higher 20 mV max temp drift and 0.35 Ω typical ZKA. | Acceptable in less demanding industrial applications where tighter drift isn't required. | Choose AS431BQTR-G1 only when cost sensitivity outweighs need for lowest drift and impedance. |
Compared with TL431BIDBZTG4, TL431BQDBZR offers identical performance and drop-in compatibility, while AS431BQTR-G1 trades minor drift and impedance degradation for lower unit cost in non-critical regulation roles.
Availability
TL431BIDBZTG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BIDBZTG4 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 delivers programmable shunt references optimized for feedback regulation in isolated power supplies, battery chargers, and industrial control systems - emphasizing accuracy, thermal stability, and robustness.
FAQ
What is the reference voltage tolerance of TL431BIDBZTG4 at 25°C?
The TL431BIDBZTG4 has a ±0.5% initial reference voltage tolerance at 25°C, corresponding to a 2.483 V to 2.507 V range around the nominal 2.495 V. This B-grade accuracy is specified per TI's SLVS543S datasheet Section 6.13 and enables high-precision feedback without post-manufacturing calibration. TL431BIDBZTG4 maintains this tolerance across its full operating temperature range.
Does TL431BIDBZTG4 support operation at automotive temperatures?
Yes, TL431BIDBZTG4 is rated for −40°C to +125°C operation (Q-grade), making it suitable for under-hood automotive applications and industrial environments with extreme thermal stress. Its 14 mV maximum reference voltage deviation over this range is verified in TI's Electrical Characteristics Table 6.13 and confirmed in Figure 6-1 of the datasheet.
What is the cathode current capability of TL431BIDBZTG4?
TL431BIDBZTG4 supports continuous cathode current from 1 mA to 100 mA, with a minimum regulation current of 0.4 mA. This sink-current range allows direct interfacing with optocoupler LEDs in isolated SMPS feedback paths and accommodates varying loop gain requirements. The 100 mA upper limit is defined in Absolute Maximum Ratings (Section 6.1).
How does the pinout of TL431BIDBZTG4 differ from TL432 variants?
TL431BIDBZTG4 uses the standard TL431 DBZ (SOT-23-3) pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. TL432 variants have reversed CATHODE and REF pins (Pin 1 = CATHODE, Pin 2 = REF), making them non-interchangeable without PCB redesign. This distinction is explicitly documented in TI's Pin Configuration and Functions section (Figure 5-1).
Can TL431BIDBZTG4 replace a Zener diode in voltage regulation circuits?
Yes, TL431BIDBZTG4 is designed as a precision replacement for Zener diodes in shunt regulation applications. Its active error amplifier provides sharper turn-on, lower dynamic impedance (0.2 Ω vs. typical Zener's >10 Ω), and superior temperature stability. It requires only two external resistors to set output voltage from 2.5 V to 36 V - unlike fixed-voltage Zeners - and is widely used in adjustable power supplies and SMPS feedback networks.
TL431BIDBZTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-23-3
TL431BIDBZTG4 FAQ
1.How can I place an order for TL431BIDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDBZTG4 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 TL431BIDBZTG4 reliable?
The price and inventory of TL431BIDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL431BIDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDBZTG4?
TL431BIDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDBZTG4 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 TL431BIDBZTG4?
For technical support, including TL431BIDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDBZTG4 requirements.
6.How does Aetrix verify that TL431BIDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL431BIDBZTG4 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 TL431BIDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL431BIDBZTG4?
All TL431BIDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDBZTG4, 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 TL431BIDBZTG4 part is unused and in its original packaging.
Return procedure for TL431BIDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDBZTG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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