CMKT3904 TR PBFREE

Overview

The CMKT3904 TR PBFREE is a dual NPN silicon small signal switching transistor manufactured by Central Semiconductor Corp. It integrates two independent NPN transistors into a single SOT-363 surface mount package. Key electrical ratings include a collector-base voltage of 60 V, a collector-emitter voltage of 40 V, and an emitter-base voltage of 6.0 V. The device supports a continuous collector current of 200 mA with a maximum power dissipation of 350 mW at 25°C ambient temperature. Transition frequency reaches 300 MHz, while DC current gain ranges from 40 to 300 depending on the collector current.

Feature Summary

• Integrates two independent NPN transistors within a compact SOT-363 package for space-constrained designs
• Optimized for general-purpose small signal amplification and high-speed switching applications
• Provides matched electrical characteristics between the two internal transistors

Applications

• General purpose amplifier circuits
• High speed switching logic interfaces
• Signal processing stages requiring dual complementary or parallel configurations

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation before procurement. Confirm that the component meets RoHS compliance requirements if restricted substances are prohibited in the target assembly. Ensure the package type matches the PCB footprint design specifications exactly.

Selection Notes

Select this component when a dual NPN configuration is required in a minimal footprint. Evaluate the thermal resistance of 357 °C/W to ensure adequate heat dissipation for the intended power levels. Compare the transition frequency and saturation voltages against circuit requirements to confirm performance suitability.

Part Context

This part belongs to the Central Semiconductor CMKT series of dual small signal transistors. The CMKT3904 variant specifically contains two NPN units, whereas the CMKT3906 variant contains two PNP units. Both share identical physical packaging and pinout configurations to facilitate design flexibility.

Replacement Considerations

Direct functional substitutes include other dual NPN transistors in SOT-363 packages such as the BC847D or MMBT3904DW. Verify pin compatibility and electrical parameter margins before substitution.