Overview
The LM431CIM3/NOPB is an adjustable precision shunt voltage regulator produced by Texas Instruments. This device is known for its temperature stability across the entire operating temperature range, making it suitable for a variety of applications. The LM431 is a 3-terminal device that can replace many Zener diode applications due to its sharp turn-on characteristics and adjustable output voltage range of 2.5V to 37V.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Voltage Range | 2.5 | - | 37 | V |
| Operating Current Range | 1 | - | 100 | mA |
| Dynamic Output Impedance (LM431C) | - | - | 0.5 | Ω |
| Temperature Range | - | - | - | - |
| Package Type | - | - | SOT-23 | - |
| ESD Rating (Human-body model) | - | - | ±2500 | V |
Key Features
- Adjustable output voltage from 2.5V to 37V, set by external resistors.
- Sharp turn-on characteristics, making it an excellent replacement for many Zener diode applications.
- Low dynamic output impedance.
- Ensured temperature stability over the entire operating temperature range.[
- Minimum operating current of 1 mA and maximum operating current of 100 mA.[
- Available in space-saving packages such as SOIC-8, SOT-23, and TO-92.[
- Optional external capacitor for noise reduction on the input voltage line.[
Applications
- Shunt voltage regulation in various electronic circuits.[
- Replacement for Zener diodes in applications requiring adjustable voltage regulation.[
- Space-critical applications due to its small footprint packages.[
- Circuits requiring stable voltage references with low dynamic output impedance.[
Q & A
- What is the output voltage range of the LM431CIM3/NOPB?
The output voltage range is adjustable from 2.5V to 37V.
- What are the minimum and maximum operating currents for the LM431CIM3/NOPB?
The minimum operating current is 1 mA, and the maximum operating current is 100 mA.[
- What package types are available for the LM431CIM3/NOPB?
The device is available in SOIC-8, SOT-23, and TO-92 packages.[
- What is the ESD rating for the LM431CIM3/NOPB?
The ESD rating is ±2500 V according to the human-body model.[
- Can the LM431CIM3/NOPB be used as a replacement for Zener diodes?
Yes, it can be used as a replacement for many Zener diode applications due to its sharp turn-on characteristics.[
- Is an external capacitor required for the LM431CIM3/NOPB?
No, an external capacitor is not required but can be used to reduce noise on the input voltage line.[
- What is the dynamic output impedance of the LM431CIM3/NOPB?
The dynamic output impedance for the LM431C is 0.5 Ω.[
- How is the output voltage of the LM431CIM3/NOPB adjusted?
The output voltage is adjusted using external resistors R1 and R2.[
- What are the considerations for selecting the series resistor (R_S) in a shunt regulator application?
R_S must be selected to ensure the current through the LM431 remains between 1 mA and 100 mA across the entire range of supply voltage and load conditions.[
- What are the layout guidelines for using the LM431CIM3/NOPB?
External components should be placed as close to the device as possible, with the series resistor and input bypass capacitor placed near the cathode and feedback resistors placed close to the device.[
