Overview
The NCP431AISNT1G is a three-terminal programmable shunt regulator diode produced by onsemi. It is designed as a direct upgrade to the industry standard TL431A. This monolithic IC voltage reference operates as a low temperature coefficient zener, programmable from the reference voltage to 36 V using two external resistors. The device is known for its low minimum operating current of 40 µA, making it ideal for secondary regulators in SMPS adapters with extremely low no-load consumption. The NCP431AISNT1G is temperature compensated for operation over its full rated operating temperature range and features a 2.5 V reference voltage, which is convenient for obtaining a stable reference from 5.0 V logic supplies.
Key Specifications
| Characteristic | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Reference Input Voltage (Vref) | V | 2.475 | 2.500 | 2.525 |
| Temperature Coefficient | ppm/°C | 50 | ||
| Minimum Operating Current | µA | 40 | ||
| Maximum Shunt Current | mA | 100 | ||
| Dynamic Output Impedance | Ω | 0.22 | ||
| Operating Temperature Range | °C | -40 | 85 | |
| Package Type | SOT-23-3 (Pb-Free) |
Key Features
- Programmable Output Voltage to 36 V using two external resistors.
- Low Minimum Operating Current: 40 µA, Typ @ 25°C.
- Voltage Reference Tolerance: ±1%, Typ @ 25°C.
- Low Dynamic Output Impedance: 0.22 Ω, Typical.
- Sink Current Capability of 40 µA to 100 mA.
- Temperature Compensated for Operation over Full Rated Operating Temperature Range.
- Equivalent Full-Range Temperature Coefficient of 50 ppm/°C, Typical.
- AEC-Q100 Qualified and PPAP Capable for automotive and other applications requiring unique site and control change requirements.
Applications
- Voltage Adapters
- Switching Power Supply
- Precision Voltage Reference
- Chargers
- Instrumentation
- Flat TVs
- Digital Voltmeters
- Op Amp Circuitry
Q & A
- What is the NCP431AISNT1G used for?
The NCP431AISNT1G is used as a programmable shunt regulator diode, ideal for applications requiring a stable voltage reference, such as in voltage adapters, switching power supplies, and precision voltage references.
- What is the minimum operating current of the NCP431AISNT1G?
The minimum operating current is 40 µA, typical at 25°C.
- What is the maximum shunt current of the NCP431AISNT1G?
The maximum shunt current is 100 mA.
- What is the dynamic output impedance of the NCP431AISNT1G?
The dynamic output impedance is 0.22 Ω, typical.
- What is the operating temperature range of the NCP431AISNT1G?
The operating temperature range is -40°C to 85°C.
- Is the NCP431AISNT1G suitable for automotive applications?
Yes, it is AEC-Q100 Qualified and PPAP Capable, making it suitable for automotive and other applications requiring unique site and control change requirements.
- How is the output voltage of the NCP431AISNT1G programmed?
The output voltage can be programmed to up to 36 V using two external resistors.
- What is the reference voltage of the NCP431AISNT1G?
The reference voltage is 2.5 V.
- What is the temperature coefficient of the NCP431AISNT1G?
The equivalent full-range temperature coefficient is 50 ppm/°C, typical.
- What package type is the NCP431AISNT1G available in?
The NCP431AISNT1G is available in the SOT-23-3 (Pb-Free) package.
