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Texas Instruments TL431BILPRE3
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- Part No.:
- TL431BILPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TL431BILPRE3.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,624
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Product details
Overview
TL431BILPRE3 from Texas Instruments is a precision programmable shunt voltage reference IC with 0.5% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 125°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 power supplies.
For engineers reviewing the TL431BILPRE3 datasheet, TL431BILPRE3 pinout, TL431BILPRE3 application, or TL431BILPRE3 equivalent, this page provides verified electrical specs, thermal behavior, stability boundaries, real-world use cases, and validated alternative parts for automotive-grade power regulation design.
Technical Context
The TL431BILPRE3 implements an internal bandgap reference, error amplifier, and NPN output stage in a three-terminal shunt topology. 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.
Designed for Q-temp (−40°C to 125°C) operation, it features 14 mV max reference voltage drift over temperature and maintains stable regulation down to 0.4 mA minimum cathode current-critical for low-power standby modes in rack server PSUs and servo drive control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV (0.5% tolerance at 25°C); sets accurate feedback threshold for voltage regulation loops |
| Temperature Range | −40°C to +125°C; qualified for under-hood automotive and industrial motor drive environments |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage shift under load transients in switching power supplies |
| Sink Current Range | 1 mA to 100 mA; supports direct interface with optocouplers and gate drivers in isolated topologies |
| Reference Input Current | 2–4 µA; enables high-impedance resistor-divider networks without significant loading error |
| Output Noise | Low broadband noise; preserves signal integrity in precision feedback paths of AC/DC adapters |
| Stability Boundary | Validated up to 100 µF capacitive load at 15 mA; simplifies compensation in flyback and forward converters |
Pinout & Package
TL431BILPRE3 is packaged in SOT-23-3 (DBZ) with 2.90 mm × 1.30 mm body size. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - all pins electrically active with no NC terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current output node | Connects to primary-side switch node or optocoupler LED anode; sinks regulated current to maintain Vref |
| REF (Pin 2) | Reference voltage sense input | High-impedance input referenced to ANODE; compares feedback voltage against internal 2.495 V bandgap |
| ANODE (Pin 3) | Common return path | Typically tied to system ground or secondary-side common; defines reference potential for REF and CATHODE |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy | Reduces need for post-manufacturing trimming in high-volume AC/DC adapter production |
| 14 mV Max Temp Drift | Enables <±0.5% total output variation across full −40°C to 125°C range in servo drives |
| 0.2 Ω Dynamic Impedance | Maintains tight regulation during fast load steps in telecom rectifiers without external compensation |
| 1–100 mA Sink Capability | Directly drives PC817/PC817x optocouplers across full operating range without buffer transistors |
| Q-Temp Qualification | Meets AEC-Q100 stress test requirements for automotive powertrain and charging systems |
Applications
| Rack Server Power | Industrial AC/DC |
|---|---|
Use Scenario: Secondary-side voltage feedback in 48 V input, 12 V/50 A isolated DC/DC modules for data center servers. IC Role / Device Role / Timing Role: Shunt reference providing precision 2.495 V threshold to optocoupler LED, closing regulation loop across isolation barrier. Use Value: Enables ±0.5% output voltage accuracy over temperature and line/load variations without digital calibration. |
Use Scenario: Output voltage regulation in DIN-rail mounted 24 V/20 A industrial power supplies feeding PLC I/O modules. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting feedback point via resistor divider; interfaces with TL431-compatible PWM controllers. Use Value: Delivers stable 24 V output despite wide input fluctuations (85–264 VAC) and ambient temperatures up to 70°C. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection in 3-phase 400 VAC inverters driving HVAC compressors. IC Role / Device Role / Timing Role: Precision reference for comparator-based overvoltage detection circuit; triggers shutdown when bus exceeds 420 V. Use Value: 0.5% tolerance ensures trip point accuracy within ±2 V, preventing nuisance trips while maintaining safety margins. |
Use Scenario: Feedback reference in dual-loop (current + velocity) control circuits for 200 V/10 A servo amplifiers used in CNC motion systems. IC Role / Device Role / Timing Role: Stable voltage reference for analog-to-digital converter biasing and current-sense amplifier offset calibration. Use Value: Low 14 mV temp drift prevents gain drift in current sensing, maintaining torque accuracy across −10°C to 65°C cabinet temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBVR | SOT-23-3 package, same 0.5% grade and −40°C to 125°C rating; identical electrical specs and pinout | No functional difference; differs only in tape-and-reel packaging (DBVR vs ILPRE3) and reel size | Select TL431BQDBVR for automated SMT placement with standard 3 kΩ tape; TL431BILPRE3 suits legacy reflow or manual prototyping |
| TL431BIDBZR | SOT-23-3 package, 0.5% grade but rated −40°C to 85°C (I-temp), not Q-temp | Not qualified for 125°C ambient; unsuitable for under-hood automotive or high-temp industrial enclosures | Choose TL431BIDBZR only for cost-sensitive commercial applications where max ambient ≤85°C |
Compared with TL431BILPRE3, TL431BQDBVR offers identical performance in a different packaging format, while TL431BIDBZR trades extended temperature capability for lower cost-making TL431BILPRE3 the sole choice for Q-temp-compliant designs requiring guaranteed operation at 125°C.
Availability
TL431BILPRE3 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and servo drive control module applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for TL431BILPRE3 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 50 years of innovation in precision analog ICs.
The TL431 family was designed as a drop-in replacement for discrete Zener+transistor regulator circuits, targeting high-accuracy voltage references in power conversion, industrial control, and automotive systems.
FAQ
What is the reference voltage tolerance of TL431BILPRE3 at 25°C?
The TL431BILPRE3 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal value with a min/max range of 2.483 V to 2.507 V. This tight tolerance is specified in Section 6.13 of the TI SLVS543S datasheet and applies across the full Q-temp operating range when combined with its 14 mV max temperature drift.
Which package type does TL431BILPRE3 use?
TL431BILPRE3 uses the SOT-23-3 (DBZ) package with dimensions 2.90 mm × 1.30 mm. Pin configuration is CATHODE (Pin 1), REF (Pin 2), ANODE (Pin 3). This matches the pinout shown in Figure 5-6 of the TI datasheet for TL431x DBZ packages and is distinct from TL432 variants.
Can TL431BILPRE3 replace a Zener diode in feedback circuits?
Yes, TL431BILPRE3 is explicitly designed as a superior replacement for Zener diodes in voltage regulation feedback paths. Its 0.2 Ω dynamic impedance, adjustable 2.495–36 V output, and sharp turn-on characteristic provide tighter regulation, lower noise, and better temperature stability than discrete Zeners-especially in isolated flyback and forward converters using optocouplers.
What is the maximum cathode voltage rating for TL431BILPRE3?
The absolute maximum cathode voltage (VK A) for TL431BILPRE3 is 37 V, with recommended operating range from Vref (≈2.495 V) to 36 V. Exceeding 37 V risks permanent damage. This rating is defined in Section 6.1 of the TI SLVS543S datasheet and applies regardless of temperature grade or package variant.
Does TL431BILPRE3 require external compensation for stability?
TL431BILPRE3 does not require external compensation in most standard configurations, but stability depends on capacitive load and cathode current. Per Figure 6-18 in the datasheet, it remains stable with up to 100 µF capacitance at 15 mA cathode current. For higher loads or faster transients, a small series resistor (e.g., 10–100 Ω) between CATHODE and optocoupler may be needed.
TL431BILPRE3 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:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TL431BILPRE3 FAQ
1.How can I place an order for TL431BILPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BILPRE3 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 TL431BILPRE3 reliable?
The price and inventory of TL431BILPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BILPRE3 is usually 5 days.
3.What payment methods are accepted for TL431BILPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BILPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BILPRE3?
TL431BILPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BILPRE3 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 TL431BILPRE3?
For technical support, including TL431BILPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BILPRE3 requirements.
6.How does Aetrix verify that TL431BILPRE3 is sourced from the original manufacturer or authorized distributors?
All TL431BILPRE3 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 TL431BILPRE3 meets industry standards.
7.What is the process for return or replacement of TL431BILPRE3?
All TL431BILPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BILPRE3, 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 TL431BILPRE3 part is unused and in its original packaging.
Return procedure for TL431BILPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BILPRE3 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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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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