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Texas Instruments TL431ACPW
- Part No.:
- TL431ACPW
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TL431ACPW.pdf
- Description:
- IC VREF SHUNT ADJ 1% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,356
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Product details
Overview
TL431ACPW from Texas Instruments is a precision programmable shunt voltage reference IC in TSSOP-8 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 and supports 1–100 mA sink current, enabling high-accuracy feedback in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL431ACPW datasheet, TL431ACPW pinout, TL431ACPW application, or TL431ACPW equivalent, this page provides verified electrical specifications, thermal performance data, stability boundary conditions, real-world use cases in AC/DC and servo drive control, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The TL431ACPW implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference voltage (2.495 V), and output transistor. Its sharp turn-on characteristic and low output impedance enable Zener diode replacement in closed-loop feedback paths where precise voltage thresholding and stable regulation are required.
It operates as a two-input comparator: the REF pin senses voltage relative to ANODE, while CATHODE sinks current proportional to the error between sensed voltage and internal reference. This configuration allows programmable regulation without external op-amps, reducing BOM count in power supply feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise regulation threshold for feedback loop design |
| Adjustable Range | 2.495 V to 36 V - enables flexible output programming using two external resistors |
| Temp Range | −40°C to +85°C - qualified for industrial-grade power systems including AC inverters and servo drives |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage deviation under load transients |
| Sink Current | 1 mA to 100 mA - supports direct interface with optocoupler LEDs in isolated flyback controllers |
| Ref Input Current | 2–4 µA - enables high-impedance voltage divider design with minimal loading error |
| Output Noise | Low broadband noise - critical for stable regulation in low-noise analog power rails |
Pinout & Package
TSSOP-8 (PW) package, 4.90 mm × 3.90 mm body size, with exposed thermal pad for enhanced power dissipation in high-current applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current output | Sinks regulated current to maintain REF voltage; connects to optocoupler anode or feedback node |
| 2 (ANODE) | Common reference return | Typically tied to system ground or power rail common point; defines voltage reference baseline |
| 3 (REF) | Threshold input | Compares external divided voltage against internal 2.495 V reference; triggers regulation action |
| 4–8 (NC) | No internal connection | Unused pins; must remain unconnected per TI specification to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Initial accuracy | ±1% at 25°C (A grade) - reduces calibration overhead in production power supplies |
| Temperature drift | ≤14 mV over −40°C to +85°C - maintains tight regulation across industrial ambient ranges |
| Low dynamic impedance | 0.2 Ω typical - minimizes output voltage shift during fast load steps in SMPS feedback loops |
| Wide cathode voltage range | 2.495 V to 36 V - supports multi-output and high-voltage DC/DC topologies without external level-shifting |
| Stability margin | Validated stability boundaries up to 100 µF capacitive load - simplifies compensation in noisy environments |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/50 A isolated server PSU with optocoupler-based feedback. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to control optocoupler LED current and regulate primary-side PWM duty cycle. Use Value: Enables ±1% output voltage accuracy across line/load/temperature, meeting ATX12VO spec requirements. |
Use Scenario: Output voltage sensing in 3-phase industrial rectifier with 400 V DC bus and 24 V auxiliary rail. IC Role / Device Role / Timing Role: Programmable reference setting feedback point for secondary-side error amplifier in dual-output flyback controller. Use Value: Replaces discrete Zener + op-amp solution, cutting component count by 3 and improving long-term drift stability. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC link voltage monitoring and overvoltage protection trigger in 7.5 kW VFD with regenerative braking. IC Role / Device Role / Timing Role: Precision shunt reference feeding comparator input to detect >420 V DC link excursion within 10 µs response. Use Value: Delivers 14 mV max temp drift over −25°C to +70°C cabinet environment, ensuring reliable trip threshold. |
Use Scenario: Isolated feedback for 200 V motor drive's gate driver bias supply and current sense amplifier reference. IC Role / Device Role / Timing Role: Dual-function reference: one TL431ACPW sets 5 V gate bias, another sets 2.5 V ADC reference for current measurement. Use Value: Single-part solution for multiple precision references eliminates matching errors between discrete Zeners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | SOT-23-3 package, 2% initial tolerance (standard grade), 0°C to 70°C rating | Limited to commercial-temperature applications; lower accuracy requires tighter resistor tolerances | Use where cost sensitivity outweighs accuracy and temperature range requirements |
| TL431BQDBVR | SOT-23-3 package, 0.5% initial tolerance (B grade), −40°C to 125°C rating | Higher accuracy and extended temp range, but smaller package limits power dissipation | Select when automotive or extended industrial operation is needed and thermal budget permits SOT-23-3 |
Compared with TL431ACPW, TL431CDBVR trades accuracy and temperature range for lower cost and smaller footprint, while TL431BQDBVR offers superior precision and wider operating range at the expense of reduced thermal margin in TSSOP-8.
Availability
TL431ACPW is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply with full traceability and lifecycle management.
Supply support for TL431ACPW 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 analog ICs and power management solutions.
The TL431 product line was designed for high-accuracy voltage regulation in isolated power supplies, feedback control systems, and programmable threshold detection-targeting industrial, computing, and motor control applications.
FAQ
What is the reference voltage tolerance of TL431ACPW at 25°C?
The TL431ACPW has a reference voltage tolerance of ±1% at 25°C, corresponding to the 'A' grade designation. This means its nominal 2.495 V reference falls within 2.470 V to 2.520 V under standard test conditions (VKA = Vref, IKA = 10 mA), enabling predictable feedback loop design in industrial power supplies.
How does TL431ACPW differ from TL431CDBVR in terms of temperature range and accuracy?
TL431ACPW is rated for −40°C to +85°C operation with ±1% initial accuracy, while TL431CDBVR operates from 0°C to +70°C with ±2% tolerance. The TL431ACPW's wider temperature range and tighter accuracy make it suitable for industrial environments where thermal stability and precision are critical, unlike the commercial-grade TL431CDBVR.
Can TL431ACPW be used in place of a Zener diode in voltage regulation circuits?
Yes, TL431ACPW replaces Zener diodes in precision regulation applications due to its sharp turn-on characteristic, low 0.2 Ω dynamic impedance, and programmable 2.495–36 V output. Unlike fixed Zeners, it uses two external resistors to set the regulation point, offering greater flexibility and improved temperature stability in feedback networks.
What is the maximum cathode voltage rating for TL431ACPW?
The absolute maximum cathode voltage (VKA) for TL431ACPW is 37 V, with recommended operation up to 36 V. Exceeding this limit risks permanent damage. In practice, designs maintain VKA ≤ 36 V while ensuring sufficient headroom above the programmed output voltage to guarantee stable regulation across all operating conditions.
Does TL431ACPW require external compensation components for stability?
TL431ACPW does not require external compensation in most configurations, but stability depends on load capacitance and cathode current. TI provides validated stability boundary curves showing safe operating regions up to 100 µF capacitive load at 100 mA; designs exceeding these limits may need series resistance or damping networks to prevent oscillation.
TL431ACPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Bulk
- 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-TSSOP
TL431ACPW FAQ
1.How can I place an order for TL431ACPW through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ACPW 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 TL431ACPW reliable?
The price and inventory of TL431ACPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ACPW is usually 5 days.
3.What payment methods are accepted for TL431ACPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ACPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ACPW?
TL431ACPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ACPW 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 TL431ACPW?
For technical support, including TL431ACPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ACPW requirements.
6.How does Aetrix verify that TL431ACPW is sourced from the original manufacturer or authorized distributors?
All TL431ACPW 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 TL431ACPW meets industry standards.
7.What is the process for return or replacement of TL431ACPW?
All TL431ACPW units undergo pre-shipment inspection (PSI). If there is an issue with TL431ACPW, 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 TL431ACPW part is unused and in its original packaging.
Return procedure for TL431ACPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ACPW Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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