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Texas Instruments TL431CLPRE3
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- Part No.:
- TL431CLPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL431CLPRE3.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,830
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Product details
Overview
TL431CLPRE3 from Texas Instruments is a precision programmable shunt voltage reference IC with 1% initial tolerance at 25°C, adjustable output voltage 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 output noise-enabling high-accuracy feedback in isolated DC/DC converters and industrial AC/DC power supplies.
For engineers reviewing the TL431CLPRE3 datasheet, TL431CLPRE3 pinout, TL431CLPRE3 application, or TL431CLPRE3 equivalent, this page provides verified electrical specifications, SOT-23-3 package details, thermal performance data, and validated alternative parts for stable voltage regulation design.
Technical Context
The TL431CLPRE3 implements an internal bandgap reference and transconductance amplifier driving an NPN output stage, enabling sharp turn-on and precise threshold control at the REF pin. Its three-terminal shunt architecture replaces Zener diodes in closed-loop feedback paths where accuracy, temperature stability, and low dynamic impedance are critical.
It operates as a two-resistor-adjustable reference: cathode voltage (VKA) is regulated by comparing REF-to-anode voltage against the internal 2.495 V reference, sinking current through the cathode to maintain setpoint. The device exhibits <16 mV total reference voltage deviation over −40°C to 85°C and maintains stability with load capacitances up to 10 µF under defined bias conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise feedback threshold for power supply error amplifiers |
| Temp Range | −40°C to +85°C - qualified for industrial ambient environments without derating |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under fast load transients |
| Sink Current Range | 1 mA to 100 mA - supports direct drive of optocoupler LEDs or series-pass transistor bases |
| Ref Input Current | 2–4 µA - enables high-impedance resistor-divider networks without significant loading error |
| Output Noise | Low broadband noise - preserves signal integrity in sensitive feedback loops |
| Min Cathode Current | 0.4–0.7 mA - defines lowest operating point for stable regulation |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Three-terminal configuration with exposed substrate connection on pin 2 (ANODE).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CATHODE) | Shunt current output node | Connects to primary-side feedback network; sinks current to regulate VKA |
| Pin 2 (ANODE) | Common reference return | Typically tied to system ground or power rail return; substrate-connected in SOT-23-3 |
| Pin 3 (REF) | Reference input threshold | Compares external divider voltage to internal 2.495 V; determines regulation setpoint |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reference range | 2.495 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage references |
| Temperature stability | ≤16 mV deviation over −40°C to +85°C - ensures consistent regulation across thermal cycling |
| Low dynamic impedance | 0.2 Ω typical - minimizes output perturbation during transient load steps |
| High sink-current capability | 100 mA max - directly drives optocouplers or base circuits without external buffers |
| Low reference input current | 2–4 µA - enables use of high-value feedback dividers to reduce power loss |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage regulation in isolated 48 V to 12 V/5 V DC/DC modules for telecom and data center servers. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop, setting precise output voltage via resistor divider. Use Value: 1% initial tolerance and low temp drift ensure tight output regulation across wide ambient and load ranges. | Use Scenario: Output voltage sensing and regulation in industrial 3-phase rectified AC/DC power supplies. IC Role / Device Role / Timing Role: Precision shunt reference providing stable feedback to PWM controller error amplifier. Use Value: 0.2 Ω dynamic impedance prevents output droop during sudden load steps in motor drive auxiliary rails. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: Auxiliary rail regulation for gate driver ICs and microcontroller power in variable-frequency inverters. IC Role / Device Role / Timing Role: Adjustable shunt reference generating stable 5 V or 3.3 V from unregulated intermediate bus. Use Value: −40°C to +85°C rating and low noise support reliable operation in thermally demanding drive enclosures. | Use Scenario: Isolated feedback path for analog current/voltage sensing circuitry in servo amplifier front-ends. IC Role / Device Role / Timing Role: Reference element in precision op-amp-based current-sense amplifier gain-setting network. Use Value: Low 2–4 µA reference input current avoids loading errors in high-impedance sense signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACLPRE3 | 0.5% initial tolerance (B grade) vs. 1% (A grade); otherwise identical specs and pinout | Required where tighter output voltage accuracy is mandated, e.g., medical-grade power supplies | Select TL431ACLPRE3 when ±0.5% reference accuracy is needed; same SOT-23-3 footprint and thermal profile |
| TL431ILPRE3 | Same 1% tolerance but rated for −40°C to +125°C operation (Q-temp grade) | Needed for under-hood automotive or high-temperature industrial environments beyond 85°C | Choose TL431ILPRE3 only if extended junction temperature range is required; otherwise TL431CLPRE3 is optimal for standard industrial use |
Compared with TL431ACLPRE3 and TL431ILPRE3, the TL431CLPRE3 balances cost, accuracy, and thermal range for mainstream industrial power applications-offering 1% tolerance and −40°C to +85°C operation in the compact SOT-23-3 package without over-specifying performance.
Availability
TL431CLPRE3 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply and long-term production continuity.
Supply support for TL431CLPRE3 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 company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The TL431 product line was designed as a precision programmable shunt reference for feedback regulation in isolated switching power supplies, replacing discrete Zener diodes with superior accuracy, stability, and sink-current capability.
FAQ
What is the reference voltage tolerance of TL431CLPRE3 at 25°C?
The TL431CLPRE3 has a reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 2.495 V output with a range of 2.470 V to 2.520 V. This A-grade specification is confirmed in Section 6.8 of the TI SLVS543S datasheet and applies specifically to the CLPRE3 variant in SOT-23-3 packaging.
What temperature range does TL431CLPRE3 support?
TL431CLPRE3 is rated for operation from −40°C to +85°C (I-grade). This is explicitly defined in the Device Comparison Table and Section 6.4 of the datasheet. The "C" suffix in TL431CLPRE3 denotes commercial-grade temperature range, but the "I" in the full ordering code confirms industrial qualification.
What package type is used for TL431CLPRE3?
TL431CLPRE3 uses the SOT-23-3 package (2.90 mm × 1.30 mm), with pin 1 = CATHODE, pin 2 = ANODE (substrate-connected), and pin 3 = REF. This is confirmed in the "Device Information" table and Pin Configuration diagrams for TL431x DBZ packages in the TI SLVS543S datasheet.
How much current can TL431CLPRE3 sink?
TL431CLPRE3 supports a continuous cathode sink current range of 1 mA to 100 mA, as specified in Section 6.4 Recommended Operating Conditions. Minimum regulation current is 0.4–0.7 mA depending on temperature, and absolute maximum cathode current is 150 mA per Absolute Maximum Ratings.
Is TL431CLPRE3 pin-compatible with other TL431 variants?
Yes-TL431CLPRE3 in SOT-23-3 (DBZ) is pin-compatible with all other TL431x DBZ variants (e.g., TL431ACLPRE3, TL431BCLPRE3) and shares identical pinout, footprint, and thermal characteristics. Pin compatibility is confirmed in Table 5-1 and the DBZ package diagrams in the TI datasheet.
TL431CLPRE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- 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:
- ±2.2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TL431CLPRE3 FAQ
1.How can I place an order for TL431CLPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431CLPRE3 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 TL431CLPRE3 reliable?
The price and inventory of TL431CLPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431CLPRE3 is usually 5 days.
3.What payment methods are accepted for TL431CLPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431CLPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431CLPRE3?
TL431CLPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431CLPRE3 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 TL431CLPRE3?
For technical support, including TL431CLPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431CLPRE3 requirements.
6.How does Aetrix verify that TL431CLPRE3 is sourced from the original manufacturer or authorized distributors?
All TL431CLPRE3 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 TL431CLPRE3 meets industry standards.
7.What is the process for return or replacement of TL431CLPRE3?
All TL431CLPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with TL431CLPRE3, 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 TL431CLPRE3 part is unused and in its original packaging.
Return procedure for TL431CLPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431CLPRE3 Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040CYM3-4.1-TR
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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