Overview
The TL431BCLPRE, produced by onsemi, is a three-terminal programmable shunt regulator diode. This monolithic IC voltage reference operates as a low temperature coefficient zener that can be programmed from a reference voltage (approximately 2.5 V) to 36 V using two external resistors. It is designed to offer a wide operating current range of 1.0 mA to 100 mA and features a typical dynamic impedance of 0.22 Ω. The TL431BCLPRE is highly versatile and can be used as either a positive or negative voltage reference, making it an excellent replacement for zener diodes in various applications.
Key Specifications
| Specification | Value |
|---|---|
| Programmable Output Voltage | 2.5 V to 36 V |
| Voltage Reference Tolerance (Typ @ 25°C) | ±0.4% (TL431B) |
| Dynamic Output Impedance (Typical) | 0.22 Ω |
| Sink Current Capability | 1.0 mA to 100 mA |
| Temperature Coefficient (Typical) | 50 ppm/°C |
| Operating Temperature Range | -40°C to +125°C |
| Operating Junction Temperature | 150°C |
| Storage Temperature Range | -65°C to +150°C |
Key Features
- Programmable output voltage from 2.5 V to 36 V using two external resistors
- Voltage reference tolerance of ±0.4% at 25°C (TL431B)
- Low dynamic output impedance of 0.22 Ω typical
- Sink current capability from 1.0 mA to 100 mA
- Low output noise voltage
- Temperature compensated for operation over the full rated operating temperature range
- Pb-free packages available
Applications
The TL431BCLPRE is suitable for a variety of applications, including:
- Digital voltmeters
- Power supplies
- Op amp circuitry
- On-board regulation
- Adjustable power supplies
- Switching power supplies
- Feedback control for driving an optocoupler in power supplies
- Voltage monitoring
- Constant current source and sink
- Series pass regulator
Q & A
- What is the programmable output voltage range of the TL431BCLPRE?
The TL431BCLPRE can be programmed to output voltages from 2.5 V to 36 V using two external resistors. - What is the typical voltage reference tolerance of the TL431BCLPRE at 25°C?
The typical voltage reference tolerance is ±0.4% at 25°C for the TL431B grade. - What is the dynamic output impedance of the TL431BCLPRE?
The dynamic output impedance is typically 0.22 Ω. - What is the sink current capability of the TL431BCLPRE?
The sink current capability ranges from 1.0 mA to 100 mA. - What is the operating temperature range of the TL431BCLPRE?
The operating temperature range is from -40°C to +125°C. - Can the TL431BCLPRE be used as a positive or negative voltage reference?
Yes, the TL431BCLPRE can be used as either a positive or negative voltage reference. - What are some common applications of the TL431BCLPRE?
Common applications include digital voltmeters, power supplies, op amp circuitry, on-board regulation, adjustable power supplies, and switching power supplies. - Is the TL431BCLPRE available in Pb-free packages?
Yes, Pb-free packages are available for the TL431BCLPRE. - What is the typical temperature coefficient of the TL431BCLPRE?
The typical temperature coefficient is 50 ppm/°C. - How does the TL431BCLPRE compare to traditional zener diodes?
The TL431BCLPRE offers better thermal stability and a wider range of programmable output voltages, making it an excellent replacement for zener diodes in many applications.
