Microchip Technology MD0101K6-G

Overview

MD0101K6-G from Microchip Technology is a four-channel high-voltage T/R (transmit-and-receive) protection switch designed for ultrasound receiver front-ends. It functions as a normally closed analog switch with 15Ω typical on-resistance, ±100V differential voltage withstand capability, ±1V trip point for automatic turn-off, and integrated clamp diodes to RGND. It protects low-noise receivers from +90V/–90V transmit pulses in medical ultrasound imaging systems.

For engineers reviewing the MD0101K6-G datasheet, MD0101K6-G pinout, MD0101K6-G application, or MD0101K6-G equivalent, this device is selected for high-speed, high-voltage transient protection where fast switching (<20 ns), low on-capacitance (15 pF), and electrically isolated channels are critical - especially in multi-channel T/R switching arrays for piezoelectric transducer interfaces.

Technical Context

The MD0101K6-G implements an autonomous voltage-sensing control circuit that monitors the TX–RX differential voltage: it remains conductive (RON ≈ 15Ω) below ±2V and transitions to high-impedance off-state above ±1V trip threshold. Each channel includes dedicated RGND pins tied to internal clamp diodes, enabling ±0.6V clamping at RX relative to RGND under overvoltage conditions.

Its four electrically isolated channels operate independently without external supplies; turn-on/off timing is sub-20 ns, and small-signal bandwidth reaches 100 MHz into 50Ω loads. The device sustains ±100V across TX–RX terminals in off-state while leaking only ±200 µA, making it suitable for resettable fuse and short-circuit protection roles beyond ultrasound.

Key Specifications

Pinout & Package

MD0101K6-G is housed in an 18-lead, 5 mm × 5 mm DFN package with exposed thermal pad (center tab must be connected to ground). Pin 1 is top-left corner (NC); pins alternate TX/RX/RGND per channel with no internal connection on odd-numbered pins except pin 17 (RX1) and pin 10 (RGND4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MD0101K6-G, MD0102K6-G offers higher voltage tolerance at the cost of increased on-resistance and reduced bandwidth, while TS3USBCA410RTER serves entirely different low-voltage interface roles and cannot replace MD0101K6-G in ultrasound or NDT protection applications.

Availability

MD0101K6-G is available at Aetrix Electronics and suitable for medical imaging systems, non-destructive testing equipment, and precision data acquisition instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MD0101K6-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and high-reliability interface solutions for industrial, automotive, and medical markets.

The MD0101K6-G belongs to Microchip's high-voltage protection switch product line, engineered specifically for T/R switching in ultrasound and NDT systems where autonomous, supply-free, fast-response transient protection is essential.

FAQ

What is the primary function of the MD0101K6-G in ultrasound systems?

The MD0101K6-G acts as an autonomous transmit/receive (T/R) switch that protects low-noise receiver amplifiers from high-voltage transmit pulses. In ultrasound systems, it connects piezoelectric transducers to both transmitter circuits and receiver inputs - conducting during echo reception (≤±1V) and opening instantly during high-voltage transmission (≥±1V). Its integrated clamp diodes and 15Ω on-resistance preserve signal integrity while enabling safe multi-channel operation in MD0101K6-G-based probe designs.

Does the MD0101K6-G require external power or control signals to operate?

No, the MD0101K6-G operates without external supplies or digital control lines. Its internal voltage-sensing circuit uses the TX–RX differential voltage itself to trigger switching - turning on below ±1V and off above that threshold. This self-powered behavior makes MD0101K6-G ideal for space-constrained, low-power ultrasound front-ends where adding bias rails or logic interfaces is impractical.

How does the RGND pin function in the MD0101K6-G?

The RGND pin on each MD0101K6-G channel provides the reference node for its integrated clamp diodes. When connected to system ground, these diodes limit RX voltage to approximately ±0.6V relative to RGND during overvoltage events - protecting downstream receivers. Leaving RGND floating disables clamping; connecting RGND to its corresponding RX pin (instead of ground) alters clamping behavior and is only recommended if external diodes are used. Proper grounding of all RGND pins is essential for MD0101K6-G to deliver its specified ±100V protection.

What is the thermal design requirement for the MD0101K6-G?

The MD0101K6-G uses an 18-lead DFN package with an exposed center thermal pad that must be soldered to a PCB ground plane. Its junction-to-ambient thermal resistance (θJA) is 40°C/W under standard FR4 mounting (25 mm × 25 mm, 1.57 mm thick). To maintain operation within the –40°C to +125°C junction temperature range, designers must ensure adequate copper area and thermal vias beneath the center tab. Failure to properly thermally connect the MD0101K6-G center tab may cause premature thermal shutdown or reliability degradation.

Can the MD0101K6-G be used outside of ultrasound applications?

Yes - while optimized for medical ultrasound T/R switching, the MD0101K6-G is also validated for non-destructive testing instrumentation, resettable fuse replacement in power monitoring circuits, and front-end protection in high-precision data acquisition systems. Its ±100V withstand, 20 ns switching, and autonomous operation make MD0101K6-G applicable wherever fast, supply-free, high-voltage transient isolation is needed - provided the 15Ω on-resistance and 100 MHz bandwidth meet system signal chain requirements.