TL431CD Texas Instruments voltage-references (SOIC) In Stock
TL431CD is a precision programmable shunt voltage reference from Texas Instruments in 8-pin SOIC. Output range 2.5V–36V, ±0.5% accuracy, 100mA sink current. From $0.09 with stock available, ships globally, 1-piece minimum.
- Manufacturer
- Texas Instruments
- Package
- SOIC
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- TL431CD Datasheet PDF
- Category
- voltage-references
- Price
- From $0.0921(MOQ 16)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Output voltage programmable from 2.5V to 36V via two external resistors
- Initial accuracy ±0.5% at 25°C (TL431AC grade)
- Sink current up to 100mA continuous
- Low dynamic impedance: 0.22Ω typical
- 8-pin SOIC (D) package for easy PCB placement
- Operating temperature –40°C to +85°C
Applications
Widely used in SMPS feedback loops, linear regulator references, and overvoltage protection circuits. Ideal for industrial power supplies, battery chargers, and consumer electronics requiring a stable, adjustable voltage reference. Commonly replaces Zener diodes where tighter accuracy is needed.
Specifications
| outputVoltageMin | 2.5V |
| outputVoltageMax | 36V |
| initialAccuracy | ±0.5% |
| sinkCurrentMax | 100mA |
| dynamicImpedance | 0.22Ω |
| supplyVoltageMin | 2.5V |
| supplyVoltageMax | 36V |
| Package | SOIC |
Compliance & Regulatory
| RoHS Status | Compliant |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How do I set the output voltage of TL431CD?
Use two external resistors (R1 and R2) connected between VOUT, REF, and GND. The output voltage is set by the formula: VOUT = VREF × (1 + R1/R2), where VREF = 2.495V. For example, to get 5V output: choose R2 = 10kΩ and R1 ≈ 20.1kΩ.
TL431CD vs TL431ACD — which accuracy grade should I pick?
TL431ACD offers tighter initial accuracy (±0.5% at 25°C) and is recommended for precision power supplies. Standard TL431CD has ±1% accuracy and suits cost-sensitive designs. Both are pin-compatible in 8-pin SOIC and share the same 2.5V–36V output range.
Can TL431CD be used in an SMPS feedback loop?
Yes. TL431CD is the industry-standard shunt reference for SMPS feedback with an optocoupler. Its low dynamic impedance (0.22Ω typ) and wide bandwidth make it ideal for stabilizing flyback and buck converter output voltage. Connect the REF pin to the resistor divider at VOUT, and the cathode to the optocoupler LED.
TL431CD packaging options and carrier types for production use?
TL431CD is available in tape-and-reel (TL431CDR) with 2500-piece reels for SMT assembly lines. The standard tube package ships 75 pieces. Both use the 8-pin SOIC-D (SO-8) footprint with 1.27mm pitch, compatible with standard reflow soldering.
What is the minimum cathode current for stable operation of TL431CD?
TL431CD requires a minimum cathode current of 1mA for stable regulation. Operating below this threshold causes the output voltage to become inaccurate. Always ensure the pull-up resistor (RLOAD) is sized so that the minimum current through the cathode exceeds 1mA under all load conditions.
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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.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 16+ | $0.0927 | $1.48 |
| 8000+ | $0.0921 | $736.56 |
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