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Texas Instruments TL431IDE4
- Part No.:
- TL431IDE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL431IDE4.pdf
- Description:
- IC VREF SHUNT ADJ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:15,500
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Product details
Overview
TL431IDE4 from Texas Instruments is a precision programmable shunt voltage reference IC with 2.495 V nominal reference voltage, ±0.5% initial tolerance (B grade), 0.2 Ω typical dynamic impedance, and operation across –40°C to 85°C. It functions as an adjustable 2.5–36 V shunt regulator in secondary-side feedback loops of isolated DC/DC converters.
For engineers reviewing the TL431IDE4 datasheet, TL431IDE4 pinout, TL431IDE4 application, or TL431IDE4 equivalent, key selection criteria include reference accuracy over temperature, cathode current sink capability (1–100 mA), low output impedance for stable regulation, and SOIC-8 package compatibility with legacy board layouts.
Technical Context
The TL431IDE4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V bandgap reference, error amplifier, and NPN output stage. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable precise voltage regulation without external compensation in most configurations.
It operates with cathode-to-anode voltage (VKA) from 2.5 V to 36 V and requires ≥0.4 mA minimum cathode current for regulation. The device draws only 2–4 µA reference input current and exhibits ≤14 mV full-range reference voltage deviation over –40°C to 85°C (I-grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.495 V nominal; ±0.5% tolerance at 25°C ensures tight setpoint accuracy for feedback networks |
| VKA Range | 2.5 V to 36 V; supports wide-output-voltage power supplies without external level-shifting |
| IKA Sink | 1 mA to 100 mA; enables direct drive of optocoupler LEDs or discrete pass transistors |
| Dynamic Impedance | 0.2 Ω typical; minimizes output voltage variation under load transients |
| VI(dev) | ≤14 mV over –40°C to 85°C; guarantees stable regulation across industrial temperature range |
| Iref | 2–4 µA; reduces resistor-divider loading error and improves efficiency in high-impedance feedback paths |
| Temp Range | –40°C to +85°C (I-grade); qualified for industrial and automotive under-hood applications |
Pinout & Package
TL431IDE4 is housed in an 8-pin SOIC (D) package with 4.90 mm × 3.90 mm body size and standard 1.27 mm pitch. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is Reference, and Pins 4–8 are no-connect (NC) terminals per TI's official pin configuration for SOIC-8 variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current output node | Connects to switched-node side of optocoupler LED or collector of external pass transistor |
| 2 (ANODE) | Common reference and return path | Typically tied to system ground or power supply return; defines voltage reference point |
| 3 (REF) | Threshold input | Compares external divider voltage against internal 2.495 V reference to control conduction |
| 4–8 (NC) | No internal connection | Unused pins; must remain unconnected per TI specification to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% initial reference tolerance | Enables <±1% output voltage accuracy in flyback SMPS designs without trimming |
| 0.2 Ω dynamic output impedance | Reduces output voltage droop during fast load steps, improving transient response |
| 1–100 mA cathode sink capability | Directly drives standard PC817/PC818 optocouplers without buffer transistors |
| 2–4 µA reference input current | Lowers power loss in high-resistance feedback dividers, extending battery life in low-power systems |
| –40°C to +85°C operating range | Supports deployment in industrial controls, telecom power, and automotive auxiliary supplies |
Applications
| Adjustable Voltage Regulation | Secondary-Side Feedback |
|---|---|
Use Scenario: Programmable bench power supply with 3–30 V output range and ±0.1% stability. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.495 V threshold for error amplifier feedback loop. Use Value: Enables single-design flexibility across multiple output voltages using only two external resistors. |
Use Scenario: Isolated 12 V/3 A flyback converter for industrial PLC I/O modules. IC Role / Device Role / Timing Role: Primary-side regulation proxy via optocoupler-coupled feedback network. Use Value: Achieves <±1.5% output regulation across line, load, and temperature without primary-side sensing. |
| Zener Diode Replacement | Voltage Monitoring |
Use Scenario: Overvoltage protection circuit triggering at 24.5 V in 24 V rail systems. IC Role / Device Role / Timing Role: Precision shunt element comparing sensed voltage against 2.495 V reference through resistor divider. Use Value: Delivers 10× better temperature stability than 24 V Zener diodes, eliminating calibration drift. |
Use Scenario: Brown-out detection for microcontroller reset assertion at 4.75 V. IC Role / Device Role / Timing Role: Adjustable comparator reference with hysteresis added via external resistor network. Use Value: Provides accurate, temperature-stable trip point without dedicated supervisor IC cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACD | 1% initial tolerance (A grade), same SOIC-8 package and pinout | Suitable where ±2% output accuracy is acceptable; lower cost for non-critical rails | Select when tighter tolerance is unnecessary and BOM cost reduction is prioritized |
| TL431BIDR | B-grade accuracy (0.5%) in SOT-23-3 package; 2.90 mm × 1.30 mm footprint | Requires PCB redesign due to 3-pin vs. 8-pin layout; saves board area in space-constrained designs | Choose for compact applications where SOIC-8 layout cannot be reused |
Compared with TL431IDE4, TL431ACD trades 0.5% accuracy for lower unit cost in fixed-voltage applications, while TL431BIDR maintains B-grade precision in a miniature package-requiring layout change but enabling higher density in modern power modules.
Availability
TL431IDE4 is available at Aetrix Electronics and suitable for industrial power supplies, isolated DC/DC converters, and voltage monitoring circuits requiring stable component supply with guaranteed long-term sourcing.
Supply support for TL431IDE4 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 reference and power management ICs.
The TL431 product line was designed specifically for high-accuracy, low-drift shunt regulation in isolated power supplies and voltage supervision systems-emphasizing thermal stability, low output impedance, and robust industrial qualification.
FAQ
What is the reference voltage tolerance of TL431IDE4 at 25°C?
The TL431IDE4 has a ±0.5% initial reference voltage tolerance at 25°C (B grade), corresponding to a 2.495 V nominal value with a 2.483–2.507 V range. This specification is verified per TI's SLVS543P datasheet Section 7.11 and ensures high-precision feedback in regulated power supplies.
Does TL431IDE4 require external capacitors for stability?
TL431IDE4 does not require external compensation capacitors in standard configurations. Its internal architecture provides inherent stability with typical dynamic impedance of 0.2 Ω. However, a 1 nF capacitor across the REF–ANODE pins may be added to suppress high-frequency noise in sensitive feedback paths involving TL431IDE4.
Can TL431IDE4 replace a Zener diode directly?
Yes, TL431IDE4 can directly replace Zener diodes in most shunt regulation roles. Unlike Zeners, TL431IDE4 offers programmable output (2.5–36 V), ±0.5% tolerance, and 14 mV max temp drift over –40°C to 85°C-making it superior for precision applications where TL431IDE4 replaces discrete Zener+resistor networks.
What is the minimum cathode current needed for TL431IDE4 regulation?
The TL431IDE4 requires a minimum cathode current (Imin) of 0.4 mA to maintain regulation, as specified in TI's SLVS543P datasheet Section 7.11. Below this threshold, the device exits active regulation mode and output voltage becomes undefined-critical for designing TL431IDE4-based optocoupler biasing networks.
Is TL431IDE4 pin-compatible with other TL431 variants in SOIC-8?
Yes, TL431IDE4 shares identical pinout (Cathode–Anode–Ref–NC×5) and SOIC-8 package dimensions with all TL431x D-package variants including TL431ACD and TL431BCD. This allows drop-in replacement across grades without PCB modification, provided thermal and accuracy requirements align with TL431IDE4 specifications.
TL431IDE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL431IDE4 FAQ
1.How can I place an order for TL431IDE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDE4 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 TL431IDE4 reliable?
The price and inventory of TL431IDE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDE4 is usually 5 days.
3.What payment methods are accepted for TL431IDE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDE4?
TL431IDE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDE4 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 TL431IDE4?
For technical support, including TL431IDE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDE4 requirements.
6.How does Aetrix verify that TL431IDE4 is sourced from the original manufacturer or authorized distributors?
All TL431IDE4 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 TL431IDE4 meets industry standards.
7.What is the process for return or replacement of TL431IDE4?
All TL431IDE4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDE4, 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 TL431IDE4 part is unused and in its original packaging.
Return procedure for TL431IDE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDE4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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