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Texas Instruments TL431ILPRE3
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- Part No.:
- TL431ILPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL431ILPRE3.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,360
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Product details
Overview
TL431ILPRE3 from Texas Instruments is a precision programmable shunt voltage reference IC with 1% initial 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 output noise-enabling accurate feedback in isolated DC-DC converters and industrial power supplies.
For engineers reviewing the TL431ILPRE3 datasheet, TL431ILPRE3 pinout, TL431ILPRE3 application, or TL431ILPRE3 equivalent, this page provides verified electrical specifications, thermal behavior, stability boundaries, real-world use cases in AC/DC and servo drive control, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The TL431ILPRE3 implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN pass transistor. Its cathode-anode-reference topology enables precise voltage regulation via external resistor dividers without requiring a dedicated supply rail.
It operates as a high-gain, low-drift comparator driving an active sink output stage, delivering sharp turn-on characteristics and stable regulation under varying load and line conditions. The I-grade temperature range (−40°C to 85°C) and 1% reference accuracy make it suitable for industrial-grade feedback loops where Zener diodes lack repeatability and thermal stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise feedback threshold for voltage regulation circuits |
| Adjustable Range | 2.495 V to 36 V - supports wide-output power supplies using two external resistors |
| 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 | 1 mA to 100 mA - provides sufficient drive for optocoupler LEDs and error amplifier interfaces |
| Ref Input Current | 2–4 µA - enables high-impedance feedback networks with minimal divider loading error |
| Output Noise | Low broadband noise - preserves signal integrity in sensitive feedback paths |
Pinout & Package
SOT-23-3 (DBZ) package: 2.90 mm × 1.30 mm body, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Cathode | Shunt current output node | Connects to regulated output rail; sinks current to maintain reference voltage at Pin 2 |
| Pin 2: Reference | Threshold input | Compares against internal 2.495 V bandgap; controls cathode conduction when voltage exceeds reference |
| Pin 3: Anode | Common return path | Typically tied to system ground or negative rail; completes current loop for regulation |
Key Features
| Feature | Design Value |
|---|---|
| 1% Initial Accuracy (I-grade) | Reduces need for post-production trimming in industrial power supplies |
| 0.2 Ω Dynamic Impedance | Maintains tight output regulation during rapid load steps in switching regulators |
| −40°C to +85°C Operation | Supports unheated enclosures in factory automation and motor drive applications |
| Low Reference Input Current | Enables high-resistance feedback dividers, minimizing power loss and PCB space |
| Stable with Capacitive Loads | Validated stability up to 100 µF at 100 mA, simplifying output filter design |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated 48 V to 12 V DC-DC modules. IC Role / Device Role / Timing Role: Shunt reference providing precise error signal to optocoupler-driven primary controller. Use Value: 1% reference accuracy maintains ±1.5% output regulation across line/load/temperature, meeting server PSU efficiency standards. |
Use Scenario: Output voltage sensing in 3 kW industrial rectifier with PFC front-end. IC Role / Device Role / Timing Role: Adjustable shunt reference setting regulated 24 V auxiliary rail for PLC I/O modules. Use Value: Wide 2.495–36 V adjustability allows single BOM part to support multiple output voltages across product variants. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: Feedback reference for DC bus overvoltage protection circuit. IC Role / Device Role / Timing Role: Precision threshold detector triggering shutdown when bus exceeds 800 V. Use Value: Low temperature drift (≤34 mV over −40°C to +85°C) ensures consistent trip point across operating environment. |
Use Scenario: Isolated feedback in dual-output servo supply (±15 V analog + 5 V digital). IC Role / Device Role / Timing Role: Dual TL431ILPRE3 units regulating independent rails with shared optocoupler biasing. Use Value: SOT-23-3 footprint minimizes board area while supporting high-density multi-rail designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | Same SOT-23-3 package; A-grade (1%) but C-temp range (0°C to 70°C) | Limited to commercial-temperature environments; unsuitable for industrial enclosures | Select when cost sensitivity outweighs extended temperature requirement |
| TL431BIDBVR | B-grade (0.5%) accuracy; same I-temp range and SOT-23-3 package | Higher precision enables tighter regulation in metrology-grade power supplies | Choose when ±0.5% initial tolerance is required for calibration-critical outputs |
Compared with TL431ACDR and TL431BIDBVR, TL431ILPRE3 uniquely balances industrial temperature rating (−40°C to 85°C), 1% accuracy, and SOT-23-3 compactness-making it optimal for cost-constrained yet thermally demanding applications where B-grade precision is unnecessary and C-grade temperature limits are insufficient.
Availability
TL431ILPRE3 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431ILPRE3 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, embedded processing, and power management technologies with over 90 years of innovation in precision analog ICs.
The TL431 family was designed as a drop-in replacement for discrete Zener-based references-delivering superior accuracy, thermal stability, and sink-current capability for feedback loops in power conversion systems.
FAQ
What is the reference voltage tolerance of TL431ILPRE3 at 25°C?
The TL431ILPRE3 has a reference voltage tolerance of ±1% at 25°C, corresponding to a nominal 2.495 V output ranging from 2.470 V to 2.520 V under standard test conditions (VKA = Vref, IKA = 10 mA). This A-grade accuracy is specified across the full industrial temperature range.
Can TL431ILPRE3 be used in place of a Zener diode?
Yes, TL431ILPRE3 functions as a precision programmable Zener replacement. Unlike passive Zeners, it offers adjustable output (2.495 V to 36 V), lower dynamic impedance (0.2 Ω vs typical 10–100 Ω), sharper knee characteristics, and guaranteed 1% accuracy-making TL431ILPRE3 ideal for high-performance feedback networks.
What is the maximum cathode voltage for TL431ILPRE3?
The absolute maximum cathode voltage (VKA) for TL431ILPRE3 is 37 V relative to the anode. The recommended operating range is Vref to 36 V. Exceeding 37 V risks permanent damage, and operation above 36 V violates recommended conditions per TI SLVS543S.
Does TL431ILPRE3 require external capacitors for stability?
TL431ILPRE3 is stable without external compensation under most conditions, but capacitive loads >100 nF may induce oscillation depending on cathode current and layout. TI's stability boundary curves (Figures 6-16/6-18) confirm stable operation up to 100 µF at 100 mA-no series resistance or capacitor is mandatory for basic regulation.
What package type is TL431ILPRE3 supplied in?
TL431ILPRE3 is supplied in the SOT-23-3 (DBZ) package: a 3-pin, surface-mount, lead-free, RoHS-compliant package with nominal dimensions of 2.90 mm × 1.30 mm. Pinout is Cathode–Reference–Anode (1–2–3), matching standard TL431 DBZ configurations.
TL431ILPRE3 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TL431ILPRE3 FAQ
1.How can I place an order for TL431ILPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431ILPRE3 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 TL431ILPRE3 reliable?
The price and inventory of TL431ILPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431ILPRE3 is usually 5 days.
3.What payment methods are accepted for TL431ILPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431ILPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431ILPRE3?
TL431ILPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431ILPRE3 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 TL431ILPRE3?
For technical support, including TL431ILPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431ILPRE3 requirements.
6.How does Aetrix verify that TL431ILPRE3 is sourced from the original manufacturer or authorized distributors?
All TL431ILPRE3 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 TL431ILPRE3 meets industry standards.
7.What is the process for return or replacement of TL431ILPRE3?
All TL431ILPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with TL431ILPRE3, 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 TL431ILPRE3 part is unused and in its original packaging.
Return procedure for TL431ILPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431ILPRE3 Tags
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