Overview
The TL431BCDMR2 is a three-terminal programmable shunt regulator diode produced by onsemi. This monolithic IC voltage reference operates as a low temperature coefficient zener, which can be programmed from Vref to 36 V using two external resistors. It is part of the TL431, A, B series and is known for its wide operating current range and low dynamic impedance, making it an excellent replacement for zener diodes in various applications.
Key Specifications
| Characteristic | Symbol | Typical Value | Unit |
|---|---|---|---|
| Programmable Output Voltage | - | Up to 36 V | V |
| Voltage Reference Tolerance | Vref | ±0.4% @ 25°C | % |
| Dynamic Output Impedance | ZKA | 0.22 Ω | Ω |
| Sink Current Capability | IK | 1.0 mA to 100 mA | mA |
| Temperature Coefficient | - | 50 ppm/°C | ppm/°C |
| Cathode to Anode Voltage | VKA | 37 V | V |
| Operating Junction Temperature | TJ | 150 °C | °C |
| Operating Ambient Temperature Range | TA | -40 to +125 °C | °C |
Key Features
- Programmable output voltage up to 36 V using two external resistors.
- Low dynamic output impedance of 0.22 Ω typical.
- Sink current capability from 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.
Applications
The TL431BCDMR2 is versatile and can be used in a variety of applications, including:
- Digital voltmeters.
- Power supplies.
- Op amp circuitry.
- Feedback control for driving an optocoupler in power supplies.
- Voltage monitor.
- Constant current source.
- Constant current sink.
- Series pass regulator.
Q & A
- What is the TL431BCDMR2?
The TL431BCDMR2 is a three-terminal programmable shunt regulator diode produced by onsemi.
- What is the programmable output voltage range of the TL431BCDMR2?
The output voltage can be programmed from Vref to 36 V using two external resistors.
- What is the typical dynamic output impedance of the TL431BCDMR2?
The typical dynamic output impedance is 0.22 Ω.
- What is the sink current capability of the TL431BCDMR2?
The sink current capability ranges from 1.0 mA to 100 mA.
- What is the temperature coefficient of the TL431BCDMR2?
The equivalent full-range temperature coefficient is 50 ppm/°C typical.
- What are the operating temperature ranges for the TL431BCDMR2?
The operating junction temperature is up to 150 °C, and the operating ambient temperature range is -40 to +125 °C.
- Can the TL431BCDMR2 be used as a positive or negative voltage reference?
Yes, it can be used as either a positive or negative voltage reference since it operates as a shunt regulator.
- What are some common applications of the TL431BCDMR2?
Common applications include digital voltmeters, power supplies, op amp circuitry, and feedback control in power supplies.
- Is the TL431BCDMR2 available in Pb-free packages?
Yes, Pb-free packages are available for the TL431BCDMR2.
- How does the TL431BCDMR2 compare to traditional zener diodes?
The TL431BCDMR2 is an excellent replacement for zener diodes due to its programmable output voltage, low dynamic impedance, and stable operation over a wide temperature range.
