TL431BQDE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The TL431BQDE4 is a precision adjustable shunt voltage reference from Texas Instruments in an SOIC-8 package. It regulates from 2.495V to 36V with up to 100mA sink current, offering tight initial accuracy. Part of the industry-standard TL431 series widely used in power supply feedback and overvoltage detection circuits.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- TL431BQDE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TL431BQDE4?
- Adjustable output voltage from 2.495V to 36V set by two external resistors for flexible reference generation
- Up to 100mA cathode sink current handles significant load variations in power supply feedback loops
- Precision 2.495V internal reference voltage with tight initial accuracy for stable voltage regulation
- Industry-standard TL431 series with broad second-source availability and extensive application reference designs
What is TL431BQDE4 used for?
The TL431BQDE4 is the standard feedback element in flyback, buck, and boost switching power supply error amplifiers, where it compares the output voltage against its internal 2.495V reference to drive optocoupler-based isolation loops. It is also used as a precision over-voltage detector, programmable shunt regulator, and adjustable reference source in linear power supplies and battery management circuits. The SOIC-8 package provides convenient multi-pin connectivity for external resistor networks and bypass capacitors in production designs.
What are the specifications of TL431BQDE4?
| YTEOL | 0 |
| Additional Feature | OUTPUT VOLTAGE ADJUSTABLE FROM 2.495V TO 36V |
| Analog IC - Other Type | TWO TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.1A |
| Output Voltage-Max | 2.507V |
| Output Voltage-Min | 2.483V |
| Output Voltage-Nom | 2.495V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temp Coef of Voltage-Max | 92ppm/°C |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trim/Adjustable Output | YES |
| Voltage Tolerance-Max | 0.5% |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Where can I find the TL431BQDE4 datasheet?
TL431BQDE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for TL431BQDE4?
Compatible alternatives and drop-in replacements for TL431BQDE4:
Two Terminal Voltage Reference, 1 Output, 2.495V, Trim/Adjustable, BIPolar, PDSO8
Frequently Asked Questions
Over what output voltage range can the TL431BQDE4 be programmed, and how is the voltage set?
The TL431BQDE4 can be adjusted from its internal reference of 2.495V up to 36V by selecting two external resistors that form a voltage divider from the cathode to the reference pin. This resistor ratio scales the regulated output without any internal programming, allowing a single TL431BQDE4 to serve as a reference in supplies from low-voltage 3.3V rails to high-voltage 24V or 30V outputs.
How much current can the TL431BQDE4 sink, and is it sufficient for isolated flyback power supply feedback?
The TL431BQDE4 sinks up to 100mA through its cathode, which far exceeds the few milliamps needed to drive an optocoupler LED in a typical isolated flyback feedback loop. The large current headroom ensures the TL431BQDE4 can drive the optocoupler even under worst-case CTR degradation at high temperature or end-of-life, improving power supply reliability across the production lifetime.
What makes the TL431 series, including TL431BQDE4, a preferred choice over a simple Zener diode for voltage regulation?
Unlike a Zener diode whose voltage is fixed and temperature-dependent, the TL431BQDE4 uses an internal bandgap reference and error amplifier to regulate with tight initial accuracy across temperature, providing dynamic impedance orders of magnitude lower than a Zener. This active regulation delivers far better line and load regulation at currents from 1mA to 100mA, which is critical in precise power supply feedback and reference generation applications.
In what package does the TL431BQDE4 come, and how does that affect PCB layout compared to the TO-92 variant?
The TL431BQDE4 uses an SOIC-8 surface-mount package with 1.27mm pitch, enabling automated pick-and-place assembly on modern SMD production lines. Compared to the through-hole TO-92 package of other TL431 variants, the SOIC-8 consumes significantly less PCB area, supports higher-density placement near the power supply feedback node, and eliminates manual insertion steps, reducing assembly cost at volume.
Related Guides
STM32H725IGT3 Selection Guide: Memory, Package, Temperature, and Supply
Choose the right STM32H725 variant by comparing Flash, package, pin count, temperature grade, connectivity, and production requirements.
Aug 1, 2026
STM32H725IGT3 High-Performance MCU Design Guide
Design STM32H725IGT3 systems for reliable 550 MHz operation with practical power, clock, cache, DMA, PCB, ADC, and recovery guidance.
Jul 31, 2026
150141VS73100 Violet SMD LED Selection Guide: Color, Drive, and Sourcing
Select the 150141VS73100 by wavelength, brightness, drive current, 3528 fit, reliability, and traceable sourcing requirements.
Jul 31, 2026
STEF05SGR 5 V eFuse Protection Design Guide
Design a reliable 5 V STEF05SGR eFuse stage with current-limit math, capacitor sizing, thermal analysis, fault recovery, and PCB layout guidance.
Jul 30, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
More from Texas Instruments
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Response time is incredible — usually under 4 hours. They understand that production lines can't wait.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit