Microchip Technology MD0105K6-G

Overview

MD0105K6-G from Microchip Technology is a 4-channel high-voltage T/R (transmit-and-receive) protection switch designed for ultrasound receiver front-ends. It functions as a normally closed, self-protecting analog switch with ±130V differential voltage withstand, 15Ω typical on-resistance, and ±2V trip threshold - enabling safe isolation of low-noise receivers from high-voltage transmit pulses in medical imaging systems.

For engineers reviewing the MD0105K6-G datasheet, MD0105K6-G pinout, MD0105K6-G application, or MD0105K6-G equivalent, this device is critical for high-fidelity signal path protection where fast switching (<20 ns), low capacitance (21 pF ON / 15 pF OFF), and electrically isolated channel operation are required in NDT, data acquisition, and high-side switching designs.

Technical Context

The MD0105K6-G implements an integrated, supply-free voltage-sensing control circuit that monitors differential voltage across each A–B pair. When VA–B exceeds ±2V, internal logic opens the switch within 20 ns, limiting current flow to ≤±200 µA while sustaining ±130V across terminals.

Each of its four independent channels operates without external bias or control signals, relying solely on intrinsic overvoltage detection. The device's 21 pF on-capacitance and 100 MHz small-signal bandwidth preserve signal integrity in wideband receive paths, while its 15Ω RSW ensures minimal insertion loss below the trip threshold.

Key Specifications

Pinout & Package

MD0105K6-G is housed in an 18-lead 5 mm × 5 mm DFN package with exposed center tab (to be connected to ground). Pin layout follows top-view orientation with alternating A/B terminals and no-connect (NC) pads for mechanical stability and EMI control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage T/R switch applications.

Compared with MD0105K6-G, MD0104K6-G offers identical per-channel performance in a smaller integration scale, while TS3USB30E serves fundamentally different low-voltage digital routing use cases - neither provides drop-in functional equivalence for ultrasound T/R protection.

Availability

MD0105K6-G is available at Aetrix Electronics and suitable for medical imaging systems, industrial NDT instruments, and high-reliability data acquisition modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MD0105K6-G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with scalable, secure, and reliable semiconductor products.

The MD0105K6-G belongs to Microchip's high-voltage protection switch product line, engineered specifically for ultrasound and NDT signal chain integrity - prioritizing fast, self-contained overvoltage response without external control or power.

FAQ

What is the primary function of the MD0105K6-G in ultrasound systems?

The MD0105K6-G serves as a transmit/receive (T/R) switch that protects low-noise receiver circuits from high-voltage transmit pulses. It operates as a normally closed analog switch with ±2V trip threshold, opening within 20 ns when voltage across A–B terminals exceeds that level. Its 15Ω on-resistance and 100 MHz bandwidth preserve signal fidelity in MD0105K6-G-based ultrasound front-ends.

Does the MD0105K6-G require external power or control signals to operate?

No - the MD0105K6-G is fully self-powered and requires no external supplies, bias voltages, or digital control lines. Its internal voltage-sensing circuit derives operating energy directly from the A–B differential voltage, enabling autonomous switching behavior. This makes MD0105K6-G ideal for compact, low-component-count ultrasound probe designs where board space and power budget are constrained.

How does the MD0105K6-G behave after triggering into the OFF state?

Once triggered OFF by exceeding ±2V differential voltage, the MD0105K6-G sustains up to ±130V across its terminals while allowing only ±200 µA leakage current. It remains latched in the high-impedance state until the A–B voltage drops below ±2V, at which point it automatically recloses. This resettable behavior eliminates manual intervention and supports continuous operation in MD0105K6-G-equipped systems.

Can the MD0105K6-G be used in DC-coupled signal paths?

Yes - the MD0105K6-G supports DC-coupled operation due to its symmetrical ±130V differential rating and bidirectional conduction. Its 15Ω on-resistance introduces minimal offset and gain error, and its 21 pF on-capacitance does not significantly affect low-frequency response. Engineers deploying MD0105K6-G in DC-coupled data acquisition or sensor interfaces should verify common-mode voltage compliance with downstream stages.

What is the thermal design guidance for the MD0105K6-G in continuous operation?

The MD0105K6-G has a junction-to-ambient thermal resistance (θJA) of 40°C/W when mounted on a 25 mm × 25 mm FR4 board. With a maximum power dissipation of 1.6 W and max junction temperature of +125°C, proper grounding of the center tab to a ≥2 cm² copper pour is essential. Thermal performance validation under worst-case pulse duty cycles is recommended for MD0105K6-G deployments in sealed or high-ambient environments.