Overview
The TL431CLPRE, part of the TL431 series, is a three-terminal programmable shunt regulator diode produced by onsemi. This monolithic IC voltage reference operates as a low temperature coefficient zener that can be programmed from a reference voltage (approximately 2.5 volts) to 36 volts using two external resistors. The device is known for its wide operating current range of 1.0 mA to 100 mA and a typical dynamic impedance of 0.22 Ω, making it an excellent replacement for zener diodes in various applications.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Reference Input Voltage | VREF | 2.44 | 2.495 | 2.55 | V |
| Cathode Voltage | VKA | VREF - 36 | V | ||
| Cathode Current Range | IKA | 1.0 | 100 | mA | |
| Reference Input Current Range | IREF | -0.05 | 10 | mA | |
| Dynamic Impedance | ZKA | 0.15 | 0.22 | 0.5 | Ω |
| Operating Temperature Range | TA | -40 | 125 | °C | |
| Junction Temperature | TJ | 150 | °C |
Key Features
- Programmable output voltage to 36 volts using two external resistors.
- Low dynamic output impedance of 0.22 Ω typical.
- Sink current capability of 1.0 mA to 100 mA.
- Equivalent full-range temperature coefficient of 50 ppm/°C typical.
- Temperature compensated for operation over the full rated operating temperature range.
- Low output noise voltage.
- Pb-free packages available.
- Fast turn-on response.
Applications
- Digital voltmeters.
- Power supplies.
- Op-amp circuitry.
- Replacement for zener diodes in various applications.
Q & A
- What is the TL431CLPRE used for?
The TL431CLPRE is used as a programmable shunt regulator diode, often replacing zener diodes in applications such as digital voltmeters, power supplies, and op-amp circuitry.
- How is the output voltage of the TL431CLPRE programmed?
The output voltage can be programmed from approximately 2.5 volts to 36 volts using two external resistors.
- What is the operating current range of the TL431CLPRE?
The device operates over a current range of 1.0 mA to 100 mA.
- What is the typical dynamic impedance of the TL431CLPRE?
The typical dynamic impedance is 0.22 Ω.
- What is the temperature coefficient of the TL431CLPRE?
The equivalent full-range temperature coefficient is 50 ppm/°C typical.
- What is the operating temperature range of the TL431CLPRE?
The operating temperature range is from -40°C to 125°C.
- Is the TL431CLPRE available in Pb-free packages?
- What is the junction temperature limit of the TL431CLPRE?
The junction temperature limit is 150°C.
- How does the TL431CLPRE compare to zener diodes?
The TL431CLPRE offers a sharper turn-on characteristic and lower dynamic impedance, making it a superior replacement for zener diodes in many applications.
- What are some common applications of the TL431CLPRE?
