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Texas Instruments TL431AIDBZRG4
- Part No.:
- TL431AIDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431AIDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
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Product details
Overview
TL431AIDBZRG4 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, 1–100 mA sink-current capability, and low 6 mV temperature drift (I-grade), making it ideal for feedback regulation in isolated DC/DC converters.
For engineers reviewing the TL431AIDBZRG4 datasheet, TL431AIDBZRG4 pinout, TL431AIDBZRG4 application, or TL431AIDBZRG4 equivalent, key selection criteria include its A-grade accuracy, SOT-23-3 footprint compatibility, thermal stability over industrial temperature range, and proven use in power supply error amplification and overvoltage protection circuits.
Technical Context
The TL431AIDBZRG4 implements a high-gain transconductance amplifier with internal 2.495 V reference, comparing REF-to-ANODE voltage against Vref to control cathode current. Its sharp turn-on characteristic and active output stage enable Zener diode replacement in closed-loop regulation without external compensation in many cases.
Designed for shunt-mode operation, it requires only two external resistors to set output voltage and maintains stable regulation down to 0.4 mA minimum cathode current. The SOT-23-3 package supports compact PCB layouts while delivering 206 °C/W junction-to-ambient thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise feedback threshold for power supply regulation |
| Temp Range | −40°C to +85°C - qualified for industrial ambient environments without derating |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage variation under load transients |
| Sink Current Range | 1 mA to 100 mA - supports direct drive of optocoupler LEDs or error amplifier inputs |
| Temp Drift (VIdev) | 14 mV max over full range - guarantees ≤0.056%/°C effective TC for stable long-term accuracy |
| Ref Input Current | 2–4 µA - enables high-impedance resistor dividers without significant loading error |
| Min Cathode Current | 0.4 mA - allows regulation at ultra-low standby power in energy-efficient designs |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Thermal pad not present; standard reflow profile applicable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference input | High-impedance node sensing divided output voltage; connects to resistor divider midpoint |
| Pin 2 (CATHODE) | Current sink output | Drives optocoupler LED or error amplifier; voltage regulated relative to ANODE |
| Pin 3 (ANODE) | Common return | Typically connected to system ground or power supply return; defines reference potential |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.495 V to 36 V via two-resistor divider - eliminates need for multiple fixed-voltage references |
| Low output noise | Sub-20 µVPP (0.1–10 Hz) - preserves signal integrity in precision feedback loops |
| Sharp turn-on characteristic | Fast response with <1 µs pulse rise time - enables reliable overvoltage latch and fast transient correction |
| Stable with capacitive loads | Validated stable up to 10 µF CL at IKA = 10 mA - simplifies EMI filter integration without oscillation risk |
| ESD robustness | ±2000 V HBM - withstands handling and board-level electrostatic events in manufacturing |
Applications
| AC/DC Power Supply Feedback | Rack Server VRM Monitoring |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback or forward converters. IC Role / Device Role / Timing Role: Shunt regulator providing error signal to optocoupler, closing regulation loop across isolation barrier. Use Value: Enables ±1% output accuracy over line/load/temperature with no transformer auxiliary winding required. |
Use Scenario: Overvoltage protection and margining in multi-rail server power delivery networks. IC Role / Device Role / Timing Role: Precision reference for comparator-based fault detection and DAC-controlled voltage adjustment. Use Value: Guarantees 1% trip threshold accuracy across −40°C to 85°C, reducing false OVP shutdowns. |
| Industrial Motor Drive Control | Notebook Adapter Regulation |
Use Scenario: DC bus voltage monitoring and current-sense amplifier reference in servo inverters. IC Role / Device Role / Timing Role: Stable 2.495 V reference for ADC biasing and analog signal conditioning circuitry. Use Value: Maintains <15 ppm/°C effective TC, preserving measurement linearity over motor thermal cycling. |
Use Scenario: Primary-side feedback reference in quasi-resonant adapters with digital controller interface. IC Role / Device Role / Timing Role: Programmable reference setting target voltage for PWM controller error amplifier. Use Value: Supports universal input (90–264 VAC) with ±1% output tolerance across full operating temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | 0°C to 70°C rating; 2% initial tolerance (standard grade) | Limited to commercial-temperature consumer applications | Select when cost sensitivity outweighs accuracy and extended temp needs |
| TL431BIDBZR | 0.5% initial tolerance; same −40°C to 85°C range | Higher accuracy required for telecom or test equipment calibration | Choose when tighter regulation (±0.5%) justifies modest cost premium |
Compared with TL431AIDBZRG4, TL431CDBZR trades accuracy and temperature range for lower unit cost, while TL431BIDBZR provides superior initial tolerance without changing footprint or thermal behavior-enabling drop-in accuracy upgrades in existing industrial designs.
Availability
TL431AIDBZRG4 is available at Aetrix Electronics and suitable for AC/DC power supplies, industrial motor drives, and notebook adapter designs requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for TL431AIDBZRG4 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 and embedded processing technologies, with decades of expertise in precision reference design and power management ICs.
The TL431 product line was engineered for high-accuracy, low-drift shunt regulation in isolated power systems, targeting industrial, computing, and communications infrastructure where reliability and thermal stability are critical.
FAQ
What is the reference voltage tolerance of TL431AIDBZRG4 at 25°C?
The TL431AIDBZRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 2.495 V output with a guaranteed range of 2.470 V to 2.520 V. This A-grade accuracy is specified per TI's SLVS543S datasheet Section 6.8 and applies across the full operating temperature range of −40°C to +85°C.
Can TL431AIDBZRG4 replace a Zener diode in feedback circuits?
Yes, TL431AIDBZRG4 is explicitly designed as a precision Zener diode replacement. Its active amplifier architecture delivers sharper turn-on, lower dynamic impedance (0.2 Ω vs typical Zener >10 Ω), and adjustable output (2.495 V–36 V) using only two resistors-enabling higher accuracy and better thermal stability than passive Zeners in SMPS feedback paths.
What is the minimum cathode current required for regulation in TL431AIDBZRG4?
The TL431AIDBZRG4 requires a minimum cathode current of 0.4 mA to maintain regulation, as confirmed in Sections 6.8–6.10 of the TI datasheet. This low Imin enables efficient operation in standby modes and supports high-value resistor dividers that reduce quiescent power consumption in battery-backed or energy-harvesting systems.
Does TL431AIDBZRG4 support capacitive loads, and what is the maximum stable value?
Yes, TL431AIDBZRG4 is stable with capacitive loads up to 10 µF at 10 mA cathode current, per Figure 6-16 and 6-18 in the TI datasheet. This allows direct connection to EMI filter capacitors or local bypass without external compensation-critical for noise-sensitive applications like server VRMs and medical power supplies.
How does the SOT-23-3 package of TL431AIDBZRG4 impact thermal performance?
The SOT-23-3 package of TL431AIDBZRG4 has a junction-to-ambient thermal resistance (RθJA) of 206 °C/W, as specified in Section 6.3 of the TI datasheet. This allows continuous dissipation up to ~300 mW at 25°C ambient before reaching the 150°C max junction temperature-sufficient for most shunt reference applications with moderate cathode current and voltage drop.
TL431AIDBZRG4 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:
- ±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-23-3
TL431AIDBZRG4 FAQ
1.How can I place an order for TL431AIDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431AIDBZRG4 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 TL431AIDBZRG4 reliable?
The price and inventory of TL431AIDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431AIDBZRG4 is usually 5 days.
3.What payment methods are accepted for TL431AIDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431AIDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431AIDBZRG4?
TL431AIDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431AIDBZRG4 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 TL431AIDBZRG4?
For technical support, including TL431AIDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431AIDBZRG4 requirements.
6.How does Aetrix verify that TL431AIDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TL431AIDBZRG4 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 TL431AIDBZRG4 meets industry standards.
7.What is the process for return or replacement of TL431AIDBZRG4?
All TL431AIDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431AIDBZRG4, 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 TL431AIDBZRG4 part is unused and in its original packaging.
Return procedure for TL431AIDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431AIDBZRG4 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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