CMJDH120 TR PBFREE

Current Regulation - Diodes, Transistors Overview

The Central Semiconductor CMJDH120 TR PBFREE is a surface mount silicon field effect current regulator diode designed for applications requiring constant current over a wide voltage range. It operates within a peak operating voltage of 50 V and dissipates up to 329 mW at 25°C ambient temperature. The nominal regulator current is 12 mA, with a maximum limiting voltage of 3.8 V at 0.8 times the nominal current. The device features a minimum dynamic impedance of 0.08 MΩ and a minimum knee impedance of 3.0 kΩ. It functions reliably across an operating and storage junction temperature range of -65°C to +150°C.

Current Regulation - Diodes, Transistors Feature Summary

• Provides constant current regulation over a wide voltage range using silicon field effect technology.
• Offers high reliability in a low-profile epoxy molded DFN123F case suitable for surface mount assembly.
• Functions as an effective replacement for tail resistors in differential amplifiers to improve common mode rejection.

Current Regulation - Diodes, Transistors Applications

• Limiting current flowing through LED strings in dimming lighting systems.
• Serving as a high-impedance tail resistor in differential amplifier designs.
• Acting as an active current source to regulate circuit current and increase common mode rejection ratio.

Current Regulation - Diodes, Transistors Procurement Notes

Verify the specific ordering suffix when purchasing. The manufacturer specifies that adding 'PBFREE' ensures lead-free plating, while 'TIN/LEAD' indicates tin/lead plating options. Confirm the package type matches the required surface mount footprint. Ensure the requested quantity aligns with standard factory packaging requirements. Cross-reference the marking code C123 to confirm the correct part identification upon receipt.

Current Regulation - Diodes, Transistors Selection Notes

Select this component when a precise 12 mA nominal current is required for biasing or regulation tasks. Consider the 50 V peak operating voltage limit for the target circuit environment. Evaluate the thermal resistance values if the device will be mounted on PCBs with varying copper trace specifications. Compare the dynamic impedance against other series members if higher precision is needed for the specific application.

Current Regulation - Diodes, Transistors Part Context

This device belongs to the CMJDH080 through CMJDH220 series of surface mount silicon current limiting diodes. All parts in this series share the same DFN123F package and general electrical characteristics, differing primarily in their specific regulator current selections. The series is manufactured by Central Semiconductor Corp and utilizes special selections for critical applications requiring defined current levels.

Current Regulation - Diodes, Transistors Replacement Considerations

Other members of the CMJDH series, such as the CMJDH100 or CMJDH150, may serve as substitutes if different current ratings are acceptable. Verify that the alternative part maintains the required peak operating voltage and power dissipation capabilities. Ensure the physical dimensions of the DFN123F package remain compatible with the existing board layout.