MMBD4148SE

Overview

The MMBD4148SE is a small signal switching diode manufactured by Taiwan Semiconductor Corporation. It features a single diode configuration housed in an SOT-23 surface-mount package. Key electrical parameters include a peak reverse voltage of 100 V, a maximum continuous forward current of 200 mA, and a peak non-repetitive forward surge current of 2 A. The device exhibits a fast recovery time of 4 ns, with a maximum forward voltage of 1 V at 10 mA and a reverse current of 5 µA at 75 V. Power dissipation is rated at 350 mW, and the junction capacitance is 4 pF at 0 V and 1 MHz. Operating temperatures range from -55°C to +150°C.

Feature Summary

• High-speed switching capability with a 4 ns reverse recovery time for efficient signal processing.
• Robust thermal performance supporting operation up to a junction temperature of +150°C.
• Compact SOT-23 surface-mount packaging designed for automated assembly and space-constrained layouts.

Applications

• Signal processing circuits requiring fast rectification.
• General-purpose switching applications in consumer electronics.
• Clamping and protection stages in high-frequency signal paths.

Procurement Notes

Verify the specific manufacturer designation when sourcing, as the MMBD4148SE part number is widely used across multiple semiconductor vendors including onsemi and Micro Commercial Components. Confirm that the component originates from Taiwan Semiconductor Corporation if brand-specific supply chain requirements are enforced. Cross-reference datasheet specifications such as forward voltage and leakage current to ensure compatibility with the target circuit design before finalizing procurement.

Selection Notes

Select this component for designs requiring a balance of low forward voltage drop and rapid switching speeds within a compact footprint. The 100 V reverse voltage rating provides adequate margin for standard low-voltage logic and power rails. Ensure the PCB layout accommodates the thermal dissipation limits associated with the 350 mW power rating in the SOT-23 package under expected operating conditions.

Part Context

This component belongs to the MMBD4148 family of small signal switching diodes. It serves as a surface-mount alternative to through-hole variants, maintaining similar electrical characteristics while enabling higher density board assembly. The series is commonly utilized in digital logic interfaces, audio signal routing, and general rectification tasks where speed and size are critical constraints.

Replacement Considerations

Direct pin-compatible substitutes include the MMBD4148CC from onsemi and the MMBD4148SE-TP from Micro Commercial Components. Verify that alternative sources meet the same 100 V reverse voltage and 200 mA forward current ratings. Check for any variations in forward voltage or leakage current that might impact sensitive analog sections of the circuit.