MD0100N8-G

Specialized Overview

The MD0100N8-G is a single-channel, high-voltage protection transmit-and-receive (T/R) switch manufactured by Microchip Technology. It operates as a normally closed, two-terminal, bidirectional current-limiting device requiring no external power supply. The component features a typical on-resistance of 15 Ω and withstands up to ±100 V across its terminals in the OFF state. It activates when the voltage drop exceeds ±2 V, limiting current to approximately 200 µA. Key electrical parameters include a peak switching current of ±60 mA, turn-off time under 20 ns, and small-signal bandwidth of 100 MHz. It functions within an operating temperature range of -40 °C to +125 °C.

Specialized Feature Summary

• Provides automatic high-voltage protection for low-noise receivers without external control signals or power supplies
• Features fast switching speed with turn-on and turn-off times under 20 ns for rapid mode transitions
• Operates as a simple two-terminal device with interchangeable terminals and low on-resistance

Specialized Applications

• Medical ultrasound imaging systems
• Non-destructive testing applications
• Fast resettable fuses for power line protection
• High-side switches and data acquisition circuits

Specialized Procurement Notes

Verify the specific ordering suffix 'N8' corresponds to the 3-lead SOT-89 package configuration. Confirm that the '-G' designation indicates lead-free and RoHS-compliant manufacturing standards. Ensure the procurement channel sources directly from authorized Microchip distributors to guarantee authenticity and traceability. Check for any specific environmental or media type requirements associated with the reel packaging.

Specialized Selection Notes

Select the MD0100N8-G when a single-channel, high-side protection solution is required for sensitive receiver inputs. This part is suitable for designs needing a normally closed switch that opens automatically upon detecting high-voltage pulses exceeding ±2 V. Consider the 15 Ω on-resistance and 21 pF capacitance for signal integrity analysis. Verify that the application environment stays within the specified -40 °C to +125 °C operating junction temperature range.

Specialized Part Context

The MD0100N8-G belongs to the MD0100 family of high-voltage protection T/R switches. While this specific variant is a single-channel device in a 3-lead SOT-89 package, the broader family includes dual-channel versions available in an 8-lead DFN package. These devices are designed primarily for protecting low-noise receivers from high-voltage transmit pulses in specialized sensing and imaging applications.

Specialized Replacement Considerations

No direct public substitute part numbers are documented for this specific component. Designers should evaluate other high-voltage protection switches based on similar electrical characteristics, such as on-resistance, trip voltage, and package compatibility, if replacement is necessary.

Specialized FAQ

Does the MD0100 require an external power supply to function?

No, the MD0100 does not require any external power supply. It is a self-contained device controlled by a built-in circuit that monitors the voltage difference between its terminals.

What happens if external diodes are not used in the circuit?

If external diodes are not present, there is no current path for the peak current to flow through the switch. Consequently, the voltage drop across the terminals will remain below ±2 V, causing the switch to stay in the ON position and fail to protect against high voltage.

How is the switch-off capacitance determined?

The switch-off capacitance is a function of the voltage across the T/R switch. It typically ranges from 12 pF to 19 pF depending on the transmit voltage level, varying between 10 V and 100 V.