CMXT3946 TR TIN/LEAD

Overview

The CMXT3946 TR TIN/LEAD is a dual complementary silicon transistor manufactured by Central Semiconductor Corp using an epitaxial planar process. It integrates one NPN and one PNP transistor within a single SUPERmini surface mount package, specifically the SOT-363 (SC-88) form factor. The device is engineered for small signal general purpose and switching applications. Key electrical parameters include a maximum collector-emitter breakdown voltage of 40V for both transistors and a continuous collector current rating of 200mA. The unit features a transition frequency of 300MHz for the NPN section and 250MHz for the PNP section, with a maximum power dissipation of 350mW. It operates across a junction temperature range of -65°C to +150°C.

Feature Summary

• Dual complementary configuration integrating matched NPN and PNP transistors in a compact surface mount footprint
• Epitaxial planar construction designed for reliable small signal amplification and high-speed switching operations
• RoHS compliant manufacturing with lead-free soldering options available alongside tin/lead variants

Applications

• Small signal general purpose amplification circuits
• High-speed digital switching applications
• Complementary push-pull output stages

Procurement Notes

Verify the specific ordering suffix when sourcing this component. The base part number CMXT3946 may be available in various packaging configurations such as tape and reel or cut tape. Confirm whether the required variant includes the tin/lead plating specification or if a lead-free alternative like CMXT3946 TR PBFREE is more suitable for your assembly process. Always cross-reference the manufacturer's latest datasheet to ensure the selected package matches your PCB design requirements before finalizing procurement.

Selection Notes

Select this component when a matched pair of NPN and PNP transistors is required in a minimal surface mount area. The 40V rating and 200mA current capacity make it suitable for low-power logic interfacing and audio pre-amplification. Ensure the thermal management strategy accounts for the 350mW power dissipation limit in the SOT-363 package. Verify that the operating frequency requirements align with the 250MHz to 300MHz transition frequencies specified for the respective transistor types.

Part Context

This component belongs to Central Semiconductor's SUPERmini series of surface mount discrete semiconductors. It serves as a compact alternative to through-hole complementary pairs, facilitating automated assembly and reduced board space consumption. The device is functionally similar to other dual complementary transistors in the industry but is distinguished by its specific epitaxial planar construction and Central Semiconductor's proprietary packaging standards.

Replacement Considerations

Direct pin-compatible substitutes may include other dual complementary transistors in SOT-363 packages such as the MMBT3946 or BC847BCW series, provided their electrical ratings meet or exceed the 40V Vceo and 200mA Ic specifications. Verify hFE matching and saturation voltages against the original datasheet to ensure circuit performance parity.