Overview
The LM431SBCM3X is a programmable shunt regulator produced by onsemi. It is part of the LM431 family, which includes the LM431SA, LM431SB, and LM431SC models. This device is a three-terminal adjustable regulator known for its thermal stability across the operating temperature range. The output voltage can be set to any value between approximately 2.5 V (VREF) and 36 V using two external resistors. This makes it highly versatile and suitable for a wide range of applications, particularly as a replacement for zener diodes.
Key Specifications
| Parameter | Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| VREF (Reference Input Voltage) | VKA = VREF, IKA = 10 mA | 2.470 | 2.495 | 2.520 | V |
| IKA (Minimum Cathode Current for Regulation) | VKA = VREF | 0.45 | 1.00 | mA | |
| IKA (Cathode Current Range) | Continuous | -100 | 150 | mA | |
| ZKA (Dynamic Output Impedance) | VKA = VREF, IKA = 1 to 100 mA, f ≥ 1.0 kHz | 0.15 | 0.50 | Ω | |
| VKA (Cathode Voltage) | 37 | V | |||
| TJ (Junction Temperature) | 150 | °C | |||
| TOPR (Operating Temperature Range) | -25 | 85 | °C | ||
| PD (Power Dissipation) | SOT-23 Package | 310 | mW |
Key Features
- Programmable Output Voltage: The output voltage can be set to any value between approximately 2.5 V and 36 V using two external resistors.
- Low Dynamic Output Impedance: Typical dynamic output impedance of 0.2 Ω, ensuring stable output voltage.
- Sink Current Capability: Can sink currents from 1.0 to 100 mA.
- Temperature Stability: Equivalent full-range temperature coefficient of 50 ppm/°C, ensuring stable operation over the full rated operating temperature range.
- Low Output Noise Voltage: Minimized noise voltage for cleaner output.
- Fast Turn-on Response: Active output circuit provides a sharp turn-on characteristic, making it an excellent replacement for zener diodes.
- Environmental Compliance: Pb-free, halogen-free/BFR-free, and RoHS compliant.
Applications
- Voltage Regulation: Ideal for applications requiring adjustable voltage regulation, such as power supplies and voltage references.
- Zener Diode Replacement: Can replace zener diodes in many circuits due to its sharp turn-on characteristic and low dynamic output impedance.
- Industrial and Automotive Systems: Suitable for use in industrial and automotive systems where temperature stability and reliability are crucial.
- Consumer Electronics: Used in various consumer electronics for voltage regulation and reference purposes.
Q & A
- What is the LM431SBCM3X used for?
The LM431SBCM3X is a programmable shunt regulator used for adjustable voltage regulation and as a replacement for zener diodes in various applications.
- What is the output voltage range of the LM431SBCM3X?
The output voltage can be set to any value between approximately 2.5 V and 36 V using two external resistors.
- What is the typical dynamic output impedance of the LM431SBCM3X?
The typical dynamic output impedance is 0.2 Ω.
- What is the sink current capability of the LM431SBCM3X?
The device can sink currents from 1.0 to 100 mA.
- What is the operating temperature range of the LM431SBCM3X?
The operating temperature range is -25°C to +85°C.
- Is the LM431SBCM3X environmentally compliant?
Yes, it is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What packages are available for the LM431SBCM3X?
The device is available in SOT-23 and SOT-23FL packages.
- What is the power dissipation limit for the SOT-23 package?
The power dissipation limit for the SOT-23 package is 310 mW.
- How does the LM431SBCM3X handle temperature variations?
The device has an equivalent full-range temperature coefficient of 50 ppm/°C, ensuring stable operation over the full rated operating temperature range.
- What are some common applications of the LM431SBCM3X?
Common applications include voltage regulation, zener diode replacement, industrial and automotive systems, and consumer electronics.
