Overview
The LM431SCCMLX is a programmable shunt regulator produced by onsemi. It is part of the LM431 series, which includes the LM431SA, LM431SB, and LM431SC models. This device is known for its thermal stability over a wide operating temperature range and its adjustable output voltage, which can be set to any value between approximately 2.5 V and 36 V using two external resistors. The LM431SCCMLX is particularly noted for its low dynamic output impedance and fast turn-on response, making it an excellent replacement for zener diodes in many applications.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Reference Input Voltage (VREF) | 2.482 | 2.495 | 2.508 | V |
| Deviation of Reference Input Voltage Over Temperature | 5 | - | 20 | mV |
| Reference Input Current (IREF) | 1.5 | 4.0 | - | μA |
| Minimum Cathode Current for Regulation (IKA(MIN)) | 0.45 | 1.00 | - | mA |
| Off-Stage Cathode Current (IKA(OFF)) | 0.05 | 1.00 | - | μA |
| Dynamic Impedance (ZKA) | 0.15 | 0.50 | - | Ω |
| Cathode Voltage (VKA) | VREF | - | 36 | V |
| Cathode Current Range (IKA) | 1 | - | 100 | mA |
| Operating Temperature Range (TOPR) | -40 | - | 85 | °C |
| Storage Temperature Range (TSTG) | -65 | - | 150 | °C |
| Junction Temperature (TJ) | - | - | 150 | °C |
| Thermal Resistance Junction-Air (RθJA) | - | - | 220 | °C/W |
| Power Dissipation (PD) | - | - | 560 | 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 voltage regulation.
- 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 suitable for applications requiring quick response times.
- Environmental Compliance: Pb-free, halogen-free/BFR-free, and RoHS compliant.
Applications
- Shunt Regulation: Can be used as a shunt regulator to regulate voltage in various circuits.
- Replacement for Zener Diodes: Excellent replacement for zener diodes due to its fast turn-on response and low dynamic output impedance.
- High Current Shunt Regulators: Suitable for high current applications where precise voltage regulation is required.
- Current Limiting and Current Sources: Can be used to create current limiting circuits or constant-current sinks.
- Output Control for Fixed Regulators: Can be used to control the output of three-terminal fixed regulators like the LM7805/MC7805.
Q & A
- What is the LM431SCCMLX used for?
The LM431SCCMLX is a programmable shunt regulator used for voltage regulation in various electronic circuits.
- What is the adjustable output voltage range of the LM431SCCMLX?
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 LM431SCCMLX?
The typical dynamic output impedance is 0.2 Ω.
- What is the sink current capability of the LM431SCCMLX?
The device can sink currents from 1.0 to 100 mA.
- Is the LM431SCCMLX environmentally compliant?
Yes, it is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What is the operating temperature range of the LM431SCCMLX?
The operating temperature range is from -40°C to +85°C.
- What is the storage temperature range of the LM431SCCMLX?
The storage temperature range is from -65°C to +150°C.
- Can the LM431SCCMLX replace zener diodes in some applications?
Yes, it can be used as an excellent replacement for zener diodes due to its fast turn-on response and low dynamic output impedance.
- What are some common applications of the LM431SCCMLX?
Common applications include shunt regulation, high current shunt regulators, current limiting circuits, and output control for fixed regulators.
- What is the junction temperature limit of the LM431SCCMLX?
The junction temperature limit is 150°C.
