Overview
The TL431ILPRE, part of the TL431 series, is a three-terminal programmable shunt regulator diode produced by onsemi. These monolithic IC voltage references operate as low temperature coefficient zener diodes, which can be programmed from the reference voltage (Vref) to 36 V 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
| Characteristic | Symbol | Value | Unit |
|---|---|---|---|
| Reference Input Voltage | Vref | 2.44 - 2.495 | V |
| Cathode to Anode Voltage | VKA | 37 | V |
| Cathode Current Range, Continuous | IK | -100 to +150 | mA |
| Reference Input Current Range, Continuous | Iref | -0.05 to +10 | mA |
| Operating Junction Temperature | TJ | 150 | °C |
| Operating Ambient Temperature Range | TA | -40 to +85 | °C |
| Dynamic Impedance | |ZKA| | 0.22 - 0.5 | Ω |
| Off-State Cathode Current | Ioff | 20 - 1000 | nA |
Key Features
- Programmable Output Voltage to 36 V
- Voltage Reference Tolerance: ±0.4% (Typ @ 25°C for TL431B), ±1% (Typ @ 25°C for TL431A), ±2% (Typ @ 25°C for Standard grade)
- Low Dynamic Output Impedance, 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 Full Rated Operating Temperature Range
- Low Output Noise Voltage
- Pb-Free Packages are Available
Applications
- Digital Voltmeters
- Power Supplies
- Op Amp Circuitry
- On-Board Regulation
- Adjustable Power Supplies
- Switching Power Supplies
Q & A
- What is the TL431ILPRE used for?
The TL431ILPRE is used as a programmable shunt regulator diode, often replacing zener diodes in applications requiring stable voltage references.
- What is the programmable output voltage range of the TL431ILPRE?
The output voltage can be programmed from the reference voltage (Vref) to 36 V using two external resistors.
- What is the typical dynamic impedance of the TL431ILPRE?
The typical dynamic impedance is 0.22 Ω.
- What is the operating current range of the TL431ILPRE?
The operating current range is 1.0 mA to 100 mA.
- What are the temperature ranges for the TL431ILPRE?
The operating ambient temperature range is -40°C to +85°C, and the operating junction temperature is up to 150°C.
- What are some common applications of the TL431ILPRE?
Common applications include digital voltmeters, power supplies, op amp circuitry, on-board regulation, and switching power supplies.
- What is the voltage reference tolerance of the TL431ILPRE at 25°C?
The voltage reference tolerance is ±0.4% for the B grade, ±1% for the A grade, and ±2% for the standard grade.
- Is the TL431ILPRE available in Pb-Free packages?
- What is the off-state cathode current of the TL431ILPRE?
The off-state cathode current is between 20 nA and 1000 nA.
- What is the storage temperature range for the TL431ILPRE?
The storage temperature range is -65°C to +150°C.
