Overview
The TL431AILPRA, produced by Onsemi, is a three-terminal programmable shunt regulator diode. This monolithic IC operates as a low temperature coefficient zener diode, which can be programmed to output voltages from 2.5 V to 36 V using two external resistors. It is part of the TL431 series, known for its wide operating current range and low dynamic output impedance, making it an excellent replacement for traditional zener diodes in various applications.
Key Specifications
| Characteristic | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Cathode to Anode Voltage | VKA | 37 | V | ||
| Cathode Current Range, Continuous | IK | -100 | 150 | mA | |
| Reference Input Current Range, Continuous | Iref | -0.05 | 10 | mA | |
| Operating Junction Temperature | TJ | 150 | °C | ||
| Operating Ambient Temperature Range | TA | -40 | 85 | °C | |
| Reference Input Voltage | Vref | 2.44 | 2.495 | 2.55 | V |
| Dynamic Impedance | |ZKA| | 0.22 | 0.5 | Ω | |
| Off-State Cathode Current | Ioff | 20 | 1000 | nA |
Key Features
- Programmable Output Voltage: Adjustable from 2.5 V to 36 V using two external resistors.
- Voltage Reference Tolerance: ±0.4% typical at 25°C for the TL431B series.
- Low Dynamic Output Impedance: Typical value of 0.22 Ω.
- Sink Current Capability: Ranges from 1.0 mA to 100 mA.
- Low Output Noise Voltage: Suitable for applications requiring stable and quiet voltage references.
- Temperature Compensated: Operates over the full rated operating temperature range with a typical equivalent full-range temperature coefficient of 30 ppm/°C.
- Pb-Free Packages Available: Compliant with environmental regulations.
Applications
- Digital Voltmeters: Provides a stable reference voltage for measurement circuits.
- Power Supplies: Used in feedback control and as a voltage reference for stable output voltages.
- Op Amp Circuitry: Serves as a precision voltage reference in operational amplifier circuits.
- Voltage Monitors and Regulators: Can be used as a constant current source, constant current sink, and series pass regulator.
- Optocoupler Driving in Power Supplies: Used for feedback control in optocoupler-driven power supplies).
Q & A
- What is the TL431AILPRA used for?
The TL431AILPRA is a three-terminal programmable shunt regulator diode used as a precision voltage reference in various applications such as digital voltmeters, power supplies, and op amp circuitry.
- What is the programmable output voltage range of the TL431AILPRA?
The output voltage can be programmed from 2.5 V to 36 V using two external resistors.
- What is the typical dynamic impedance of the TL431AILPRA?
The typical dynamic impedance is 0.22 Ω.
- What is the operating current range of the TL431AILPRA?
The device operates with a current range of 1.0 mA to 100 mA.
- What is the temperature coefficient of the TL431AILPRA?
The device has a typical equivalent full-range temperature coefficient of 30 ppm/°C.
- What are the typical applications of the TL431AILPRA?
It is used in digital voltmeters, power supplies, op amp circuitry, voltage monitors, and as a constant current source or sink.
- What is the maximum cathode to anode voltage for the TL431AILPRA?
The maximum cathode to anode voltage is 37 V.
- What is the operating ambient temperature range for the TL431AILPRA?
The operating ambient temperature range is from -40°C to 85°C.
- Is the TL431AILPRA available in Pb-free packages?
- What is the off-state cathode current of the TL431AILPRA?
The off-state cathode current is typically between 20 nA and 1000 nA.
