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Texas Instruments TL431ACDRG4
- Part No.:
- TL431ACDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL431ACDRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,926
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Product details
Overview
TL431ACDRG4 from Texas Instruments is a precision programmable shunt voltage reference IC with 1% initial tolerance at 25°C, adjustable output from 2.47V to 36V, and operation across −40°C to 85°C. It delivers 0.2Ω typical dynamic impedance, 1–100mA sink-current capability, and low 6mV temperature drift (C-grade), enabling high-accuracy feedback in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL431ACDRG4 datasheet, TL431ACDRG4 pinout, TL431ACDRG4 application, or TL431ACDRG4 equivalent, key selection criteria include its A-grade accuracy, SOT-23-3 package compatibility, thermal stability over industrial temperature range, and proven use in AC/DC adapter feedback loops and servo drive voltage regulation.
Technical Context
The TL431ACDRG4 implements a three-terminal adjustable shunt regulator architecture with an internal precision reference amplifier and NPN pass transistor. Its REF pin senses voltage relative to ANODE, triggering cathode current sink when input exceeds Vref - enabling precise closed-loop regulation without external op-amps.
It operates as a 2.47–36V programmable reference via two external resistors, with sharp turn-on characteristics and low 0.2Ω dynamic impedance ensuring stable regulation under load transients. The device is not a Zener diode replacement by topology but achieves comparable function with superior thermal drift and noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref tolerance | ±1% at 25°C (A-grade) - ensures tight output voltage setting in feedback networks |
| Adjustable range | 2.47V to 36V - supports wide-range output programming with two resistors |
| Temp range | −40°C to +85°C (I-grade) - qualified for industrial ambient environments |
| Dynamic impedance | 0.2Ω typical - minimizes output voltage deviation during load steps |
| Sink current | 1mA to 100mA - provides sufficient drive for optocoupler LEDs in isolated SMPS |
| Ref input current | 2–4µA - enables high-resistance divider networks without significant error |
| Temp drift (VI(dev)) | 14mV max over full range - guarantees <0.05%/°C effective TC in typical designs |
Pinout & Package
SOT-23-3 package (2.90mm × 1.30mm body), surface-mount, lead-free, RoHS-compliant. Pin 1 = Cathode, Pin 2 = Reference, Pin 3 = Anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output node | Connects to primary-side feedback path; sinks current to regulate output voltage |
| Reference (Pin 2) | Threshold sensing input | Compares divided output voltage against internal 2.495V reference; sets regulation point |
| Anode (Pin 3) | Common return/reference ground | Typically tied to system ground or secondary-side common; defines voltage reference plane |
Key Features
| Feature | Design Value |
|---|---|
| Programmable reference | 2.47–36V output via resistor divider - eliminates need for multiple fixed references |
| Low dynamic impedance | 0.2Ω typical - maintains regulation accuracy during fast load transients in SMPS |
| Industrial temp grade | −40°C to +85°C operation - suitable for factory automation and motor drive applications |
| Low reference current | 2–4µA input - allows >1MΩ divider networks, reducing power loss and noise sensitivity |
| Stable with capacitive loads | Compatible with standard optocoupler CTR compensation networks - simplifies isolated feedback design |
Applications
| Rack Server Power Supply | Industrial AC/DC Adapter |
|---|---|
Use Scenario: Primary-side voltage feedback in 48V intermediate bus converters with optocoupler isolation. IC Role / Device Role / Timing Role: Programmable shunt reference setting precise output voltage via resistor divider on secondary side. Use Value: Enables ±1% output regulation across line/load/temperature while supporting compact SOT-23 layout. |
Use Scenario: Output voltage regulation in 24V/5A industrial wall adapters powering PLC I/O modules. IC Role / Device Role / Timing Role: Precision reference in TL431-based flyback feedback loop with PC817 optocoupler. Use Value: Delivers stable 24V ±1.5% over −40°C to +85°C with <10mV ripple rejection. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Auxiliary 15V rail regulation for gate driver ICs in 3-phase VFD power stages. IC Role / Device Role / Timing Role: Shunt reference stabilizing isolated auxiliary supply feeding IR2110 bootstrap circuits. Use Value: Maintains 15V ±2% under 100mA load step with 0.2Ω impedance limiting droop to <20mV. |
Use Scenario: Feedback reference for dual-output 5V/12V servo controller power stage with shared transformer winding. IC Role / Device Role / Timing Role: Adjustable reference setting 12V output while sharing REF node with 5V LDO monitor circuit. Use Value: Allows single-component solution for multi-rail regulation with <0.5% cross-regulation error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACD | Same electrical specs and SOT-23-3 package; RG4 suffix indicates tape-and-reel packaging per JEDEC J-STD-020 | No functional difference; identical use in feedback circuits and voltage monitors | Select TL431ACD for tray delivery or non-automated assembly; TL431ACDRG4 preferred for pick-and-place |
| TL431AILP | SOIC-8 package (4.90mm × 3.90mm); same A-grade accuracy and −40°C to +85°C rating | Better thermal dissipation (RθJA = 97°C/W vs 206°C/W) and higher creepage for reinforced isolation | Choose TL431AILP when board space permits and higher power handling (>500mW) or safety spacing is required |
Compared with TL431ACD and TL431AILP, the TL431ACDRG4 offers optimal balance of miniaturization, automated assembly readiness, and industrial temperature compliance - making it the default choice for space-constrained, high-volume power supply designs.
Availability
TL431ACDRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC adapters, and servo drive control modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for TL431ACDRG4 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 and power management ICs.
The TL431 product line was designed for high-accuracy voltage regulation in isolated and non-isolated power supplies, targeting industrial, computing, and motor control applications where reliability and thermal stability are critical.
FAQ
What is the reference voltage tolerance of TL431ACDRG4 at 25°C?
The TL431ACDRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a Vref range of 2.47V to 2.52V. This A-grade accuracy is specified in Section 6.8 of the TI datasheet and applies across the full operating current range of 1–100mA. The TL431ACDRG4 achieves this using laser-trimmed internal resistors and matched transistor pairs.
Does TL431ACDRG4 support operation at −40°C?
Yes, TL431ACDRG4 is rated for operation from −40°C to +85°C (I-grade). Its electrical characteristics - including Vref, dynamic impedance, and reference current - are fully specified across this range. The 14mV maximum VI(dev) over temperature confirms stable regulation performance in cold industrial environments.
What package type is used for TL431ACDRG4?
TL431ACDRG4 uses the SOT-23-3 package (2.90mm × 1.30mm body size), with pin 1 = Cathode, pin 2 = Reference, and pin 3 = Anode. The "RG4" suffix denotes tape-and-reel packaging compliant with JEDEC J-STD-020 moisture sensitivity level 1, suitable for standard reflow processes.
Can TL431ACDRG4 replace a Zener diode in feedback circuits?
Yes, TL431ACDRG4 is explicitly designed as a superior alternative to Zener diodes in voltage regulation applications. Its active circuitry provides sharper turn-on, lower dynamic impedance (0.2Ω vs typical Zener's >5Ω), and tighter temperature stability - making it ideal for optocoupler-based feedback in isolated SMPS where Zeners exhibit poor regulation.
What is the minimum cathode current required for regulation in TL431ACDRG4?
The TL431ACDRG4 requires a minimum cathode current of 0.4mA to maintain regulation, with typical value of 0.6mA at 25°C (Section 6.8). This low Imin enables reliable startup and regulation even with high-value feedback dividers and low-power optocouplers, unlike many Zener alternatives requiring ≥5mA.
TL431ACDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8-SOIC
TL431ACDRG4 FAQ
1.How can I place an order for TL431ACDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACDRG4 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 TL431ACDRG4 reliable?
The price and inventory of TL431ACDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACDRG4 is usually 5 days.
3.What payment methods are accepted for TL431ACDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACDRG4?
TL431ACDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACDRG4 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 TL431ACDRG4?
For technical support, including TL431ACDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACDRG4 requirements.
6.How does Aetrix verify that TL431ACDRG4 is sourced from the original manufacturer or authorized distributors?
All TL431ACDRG4 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 TL431ACDRG4 meets industry standards.
7.What is the process for return or replacement of TL431ACDRG4?
All TL431ACDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACDRG4, 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 TL431ACDRG4 part is unused and in its original packaging.
Return procedure for TL431ACDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ACDRG4 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
Microchip Technology
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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
-
AZ431LANTR-G1
Diodes Incorporated
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