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Texas Instruments TL431ACDBZRG4
- Part No.:
- TL431ACDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431ACDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,566
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Product details
Overview
TL431ACDBZRG4 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 to 100 mA sink-current capability, and operation across −40°C to 125°C. It replaces Zener diodes in feedback loops of isolated DC/DC converters, AC/DC adapters, and industrial power supplies.
For engineers reviewing the TL431ACDBZRG4 datasheet, TL431ACDBZRG4 pinout, TL431ACDBZRG4 application, or TL431ACDBZRG4 equivalent, key selection criteria include reference accuracy over temperature, dynamic impedance (0.2 Ω), cathode voltage range (2.5 V to 36 V), and thermal stability for closed-loop regulation in safety-critical power systems.
Technical Context
The TL431ACDBZRG4 implements an internal error amplifier and NPN transistor output stage configured as a three-terminal adjustable shunt regulator. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when the divider ratio exceeds VREF, enabling precise output voltage setting via two external resistors.
It operates with a typical output impedance of 0.2 Ω and low 10 µV/√Hz input noise at 1 kHz, supporting stable regulation in high-frequency switching power supplies. The device exhibits sharp turn-on characteristics and maintains regulation down to 0.4 mA minimum cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V (nominal); enables accurate 2.5 V–36 V adjustable output via resistor divider |
| Initial Tolerance | ±0.5% at 25°C (A-grade); ensures tight output voltage control without trimming |
| Temp Range | −40°C to +125°C (Q-grade); supports automotive and industrial ambient conditions |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage deviation under load transients |
| Sink Current Range | 1 mA to 100 mA; sufficient for optocoupler biasing and error amplifier drive |
| Ref Input Current | 2–4 µA; enables high-impedance feedback networks with minimal divider loading |
| Max Cathode Voltage | 36 V; compatible with wide-input industrial and telecom power rails |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference input | Senses voltage divider output; regulates when VREF = 2.495 V relative to ANODE |
| Pin 2: CATHODE | Shunt current output | Sinks regulated current into external circuit; connects to transformer feedback winding or optocoupler LED |
| Pin 3: ANODE | Common reference node | Typically tied to system ground or return path; defines reference potential for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Set precisely from 2.5 V to 36 V using only two external resistors |
| Low output noise | 10 µV/√Hz at 1 kHz; preserves signal integrity in sensitive feedback paths |
| Sharp turn-on characteristic | Enables fast response to output deviations, improving transient regulation in SMPS |
| Thermal stability | 14 mV max VREF drift over −40°C to +125°C; maintains accuracy without compensation |
| High ESD robustness | ±2000 V HBM rating; withstands handling and board assembly stress |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Primary-side feedback in isolated 48 V–54 V intermediate bus converters for multi-rail server PSUs. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage sensing to optocoupler-driven PWM controller. Use Value: Enables ±1% output regulation across line/load/temperature while reducing component count vs. discrete Zener+transistor solutions. | Use Scenario: Secondary-side voltage regulation in DIN-rail mounted 24 V/48 V AC/DC modules for PLC and I/O systems. IC Role / Device Role / Timing Role: Programmable reference in linear post-regulator or error amplifier feedback loop. Use Value: Delivers stable 2.5 V–36 V setpoint with <0.2 Ω impedance, minimizing output droop under 100 mA load steps. |
| AC Inverter Drives | Notebook PC Adapter |
Use Scenario: DC bus voltage monitoring and overvoltage protection in 3-phase motor drives with regenerative braking. IC Role / Device Role / Timing Role: Precision threshold detector feeding comparator or microcontroller ADC input. Use Value: 0.5% initial accuracy and 14 mV temp drift ensure reliable trip point across −40°C to +125°C junction temperatures. | Use Scenario: Feedback reference in compact 19 V/3.4 A flyback adapter with synchronous rectification. IC Role / Device Role / Timing Role: Adjustable shunt reference controlling optocoupler current to primary-side controller. Use Value: Low 2–4 µA reference input current allows high-value feedback dividers, reducing standby power loss 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 |
|---|---|---|---|
| TL431CDBZR | Same SOT-23-3 package but C-grade (0°C–70°C, ±2% tolerance) | Limited to commercial-temperature consumer adapters; not suitable for industrial or automotive use | Select TL431CDBZR only if cost sensitivity outweighs accuracy and temperature range requirements. |
| TL431BQDBZR | B-grade (±0.5%) with Q-temp rating (−40°C to +125°C), identical pinout and electrical specs | Functionally identical; differs only in grade marking and test screening | TL431BQDBZR is a direct functional replacement with same performance envelope and qualification level. |
Compared with TL431CDBZR, TL431ACDBZRG4 offers tighter initial tolerance and extended temperature range-critical for industrial reliability-while TL431BQDBZR provides identical specification compliance with alternate grade labeling, enabling seamless sourcing continuity.
Availability
TL431ACDBZRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and AC inverter drive applications requiring stable component supply, long-term lifecycle support, and traceable manufacturing origin.
Supply support for TL431ACDBZRG4 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 delivers highly stable, adjustable shunt references for closed-loop voltage regulation in power conversion systems-from consumer adapters to mission-critical industrial and automotive applications.
FAQ
What is the reference voltage tolerance of TL431ACDBZRG4 at 25°C?
The TL431ACDBZRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal 2.495 V output with a guaranteed range of 2.470 V to 2.520 V. This A-grade accuracy is specified in Section 6.8 of the TI datasheet and applies strictly to the TL431ACDBZRG4 variant with SOT-23-3 packaging and Q-temperature rating.
Can TL431ACDBZRG4 replace a standard Zener diode in feedback circuits?
Yes, TL431ACDBZRG4 directly replaces Zener diodes in feedback networks due to its sharp turn-on characteristic, adjustable 2.5 V–36 V output, and 0.2 Ω dynamic impedance. Unlike fixed Zeners, TL431ACDBZRG4 enables precise, resistor-programmable regulation without voltage binning or calibration-making it ideal for optocoupler-based isolated SMPS designs.
What is the maximum cathode voltage supported by TL431ACDBZRG4?
The TL431ACDBZRG4 supports a maximum cathode voltage (VKA) of 36 V, as defined in Absolute Maximum Ratings (Section 6.1). Operation beyond this limit risks permanent damage. The device maintains regulation across its full 2.5 V–36 V output range when used with appropriate external resistors and within recommended operating conditions.
Does TL431ACDBZRG4 require external capacitors for stability?
TL431ACDBZRG4 may require an external capacitor (typically 1 nF–100 nF) from CATHODE to ANODE in high-gain or high-capacitive-load configurations to prevent oscillation, as shown in Figures 6-16 and 6-18 of the datasheet. Stability depends on load capacitance and cathode current; no capacitor is needed for basic resistor-divider applications with <100 pF parasitic capacitance.
How does the temperature coefficient of TL431ACDBZRG4 compare to older TL431 variants?
TL431ACDBZRG4 exhibits a maximum reference voltage deviation of 14 mV over −40°C to +125°C, matching the TL431Q-grade specification. This is tighter than standard-grade (25 mV) and comparable to B-grade Q-temp devices. The deviation is measured as peak-to-peak variation-not average TC-and reflects actual performance across the full industrial temperature range.
TL431ACDBZRG4 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:
- 600 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL431ACDBZRG4 FAQ
1.How can I place an order for TL431ACDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACDBZRG4 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 TL431ACDBZRG4 reliable?
The price and inventory of TL431ACDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACDBZRG4 is usually 5 days.
3.What payment methods are accepted for TL431ACDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACDBZRG4?
TL431ACDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACDBZRG4 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 TL431ACDBZRG4?
For technical support, including TL431ACDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACDBZRG4 requirements.
6.How does Aetrix verify that TL431ACDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TL431ACDBZRG4 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 TL431ACDBZRG4 meets industry standards.
7.What is the process for return or replacement of TL431ACDBZRG4?
All TL431ACDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACDBZRG4, 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 TL431ACDBZRG4 part is unused and in its original packaging.
Return procedure for TL431ACDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ACDBZRG4 Tags
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TL431AIDBZR
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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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LM4040D20IDBZR
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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
Diodes Incorporated
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