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Texas Instruments TL431BILPE3
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- Part No.:
- TL431BILPE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TL431BILPE3.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,565
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Product details
Overview
TL431BILPE3 from Texas Instruments is a precision programmable shunt voltage reference IC with 0.5% initial tolerance at 25°C, adjustable output from 2.495 V to 36 V via two external resistors, 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-used in feedback loops of isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL431BILPE3 datasheet, TL431BILPE3 pinout, TL431BILPE3 application, or TL431BILPE3 equivalent, key selection criteria include its Q-temp grade temperature range, B-grade accuracy, SOT-23-3 package footprint, and shunt regulator topology for stable voltage sensing in high-reliability power control systems.
Technical Context
The TL431BILPE3 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference and high-gain error amplifier. Its active output stage provides sharp turn-on characteristics, enabling precise regulation without external compensation in most configurations.
It operates as a voltage-controlled current sink: the REF pin senses voltage relative to ANODE, and cathode current (IKA) adjusts to maintain VREF = 2.495 V ±12.5 mV over −40°C to 125°C. The device requires minimum 0.4 mA cathode current for regulation and exhibits <0.5 µA off-state leakage at 36 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12.5 mV (0.5% B-grade tolerance at 25°C; defines setpoint accuracy for feedback networks) |
| Temperature Range | −40°C to +125°C (Q-temp grade; supports automotive under-hood and industrial motor drive environments) |
| Dynamic Impedance | 0.2 Ω typical (enables tight regulation under load transients; critical for stability in switching PSUs) |
| Sink Current Range | 1 mA to 100 mA (supports direct interface with optocoupler LEDs or discrete transistor bases) |
| Reference Input Current | 2–4 µA (low bias current minimizes resistor-divider loading error in high-impedance feedback paths) |
| Output Noise | Low broadband noise (typ. 200 nV/√Hz @ 1 kHz); reduces jitter in precision voltage monitoring) |
| Max Cathode Voltage | 36 V (allows use in 24 V industrial rails and 32 V telecom systems with margin) |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current output node | Connects to switched node or optocoupler anode; sinks regulated current to maintain REF voltage |
| REF (Pin 2) | Reference input threshold | Senses voltage divider output; triggers regulation when VREF = 2.495 V relative to ANODE |
| ANODE (Pin 3) | Common return/reference ground | Typically tied to system ground or negative rail; serves as voltage reference point for REF pin |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Accuracy (B Grade) | Reduces need for post-manufacturing trimming in closed-loop power supplies |
| −40°C to +125°C Operation (Q Grade) | Enables deployment in engine control units, servo drives, and outdoor industrial inverters |
| 0.2 Ω Dynamic Impedance | Minimizes output voltage deviation during fast load steps in SMPS feedback paths |
| 1–100 mA Sink Capability | Directly drives PC817/PC818 optocouplers without buffer transistors in isolated flyback designs |
| Low 2–4 µA Reference Current | Permits use of >1 MΩ feedback dividers, lowering power loss and thermal drift in high-voltage rails |
Applications
| Industrial AC/DC Power Supply | Rack Server VRM Feedback |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/50 A isolated AC/DC front-end supplies. IC Role / Device Role / Timing Role: Shunt reference in optocoupler-coupled feedback loop, setting precise 12 V output via resistor divider on REF pin. Use Value: 0.5% reference accuracy ensures output stays within ±60 mV over temperature and line, meeting IEC 62368-1 safety margins. |
Use Scenario: Precision voltage monitoring in multi-phase buck VRMs powering Xeon Scalable processors. IC Role / Device Role / Timing Role: High-stability reference for ADC-based rail telemetry and PMBus-compatible margining circuits. Use Value: Low 0.2 Ω impedance prevents measurement error during 100 A transient load steps, enabling accurate real-time rail health reporting. |
| Servo Drive Control Module | AC Inverter & VF Drives |
|
Use Scenario: Isolated bus voltage sensing and overvoltage protection in 3-phase servo amplifiers with 300 V DC link. IC Role / Device Role / Timing Role: Programmable threshold detector feeding comparator inputs for fast shutdown logic. Use Value: Q-temp rating guarantees reliable operation at 105°C ambient inside enclosed motor cabinets without derating. |
Use Scenario: Feedback stabilization in 690 V industrial inverters controlling induction motors in HVAC and pumping systems. IC Role / Device Role / Timing Role: Primary-side shunt reference in auxiliary 24 V supply, regulating gate driver bias rails. Use Value: 36 V max cathode voltage allows direct use with 24 V auxiliary windings without series Zener clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | C-grade (±2% tolerance), 0°C–70°C temp range, same SOT-23-3 package | Limited to commercial indoor equipment; unsuitable for automotive or extended-temperature industrial use | Select only if cost sensitivity outweighs accuracy and temperature requirements |
| TLVH431BQDBVR | Lower 1.24 V reference, 0.5% accuracy, Q-temp, but 20 V max cathode voltage | Cannot replace TL431BILPE3 in >20 V feedback paths (e.g., 24 V or 36 V rails) | Use where lower reference voltage enables higher divider ratio and reduced power loss |
Compared with TL431CDBZR and TLVH431BQDBVR, TL431BILPE3 uniquely combines B-grade accuracy, Q-temp range, and 36 V cathode rating in SOT-23-3-making it the only choice for high-reliability, wide-input industrial power feedback where all three specs are mandatory.
Availability
TL431BILPE3 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, rack server VRMs, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BILPE3 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 decades of heritage in precision analog ICs.
The TL431 product line was designed specifically for high-accuracy, low-drift voltage reference applications in power conversion, industrial control, and automotive systems-emphasizing robustness, wide temperature operation, and ease of integration.
FAQ
What is the reference voltage tolerance of TL431BILPE3 at 25°C?
The TL431BILPE3 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal 2.495 V output with a guaranteed range of 2.483 V to 2.507 V. This B-grade accuracy is specified in Section 6.11 of the TI SLVS543S datasheet and applies across the full Q-temp operating range when used within recommended conditions.
What temperature range does TL431BILPE3 support?
TL431BILPE3 supports operation from −40°C to +125°C, classified as Q-temp grade per TI's device nomenclature. This rating is validated per Section 6.13 (Electrical Characteristics, TL431BQ) and enables use in demanding environments such as motor drives, automotive ECUs, and outdoor industrial inverters without thermal derating.
Which package type is used by TL431BILPE3?
TL431BILPE3 uses the SOT-23-3 (DBZ) package, measuring 2.90 mm × 1.30 mm. Pin configuration is CATHODE–REF–ANODE (Pin 1–2–3), confirmed in Figure 5-1 and Table 5-1 of the TI datasheet. The "E3" suffix denotes lead-free, RoHS-compliant finish.
Can TL431BILPE3 replace a Zener diode in voltage regulation circuits?
Yes, TL431BILPE3 is explicitly designed as a superior replacement for Zener diodes in shunt regulation applications. Its active circuitry provides sharper turn-on, lower dynamic impedance (0.2 Ω vs. typical Zener's 5–50 Ω), and tighter voltage tolerance-especially beneficial in adjustable power supplies and isolated DC/DC feedback loops where Zener drift and poor regulation would compromise performance.
What is the minimum cathode current required for TL431BILPE3 to regulate?
The TL431BILPE3 requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as specified in Sections 6.11–6.13 of the datasheet. Below this threshold, the device exits regulation mode and cathode voltage rises uncontrollably-so feedback networks must ensure ≥0.4 mA flows through the cathode under all operating conditions, including light-load and startup.
TL431BILPE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- 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:
- ±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
TL431BILPE3 FAQ
1.How can I place an order for TL431BILPE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BILPE3 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 TL431BILPE3 reliable?
The price and inventory of TL431BILPE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BILPE3 is usually 5 days.
3.What payment methods are accepted for TL431BILPE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BILPE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BILPE3?
TL431BILPE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BILPE3 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 TL431BILPE3?
For technical support, including TL431BILPE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BILPE3 requirements.
6.How does Aetrix verify that TL431BILPE3 is sourced from the original manufacturer or authorized distributors?
All TL431BILPE3 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 TL431BILPE3 meets industry standards.
7.What is the process for return or replacement of TL431BILPE3?
All TL431BILPE3 units undergo pre-shipment inspection (PSI). If there is an issue with TL431BILPE3, 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 TL431BILPE3 part is unused and in its original packaging.
Return procedure for TL431BILPE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BILPE3 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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