Monolithic Power Systems Inc. MP4816GFP

Overview

MP4816GFP from Monolithic Power Systems is a 16-channel, high-voltage, SPST analog switch designed for medical ultrasound transmit/receive multiplexing. It supports ±90V analog signal handling, 12.5Ω typical on-resistance, ±2.0A peak switch current, and operates from dual low-voltage supplies (3.3V/5V logic + 9–10V translator). It enables channel reduction in portable ultrasound probe heads by routing PZT transducer signals between shared HV pulsers and receivers.

For engineers reviewing the MP4816GFP datasheet, MP4816GFP pinout, MP4816GFP application, or MP4816GFP equivalent, key selection criteria include high-voltage blocking capability (±90V), serial daisy-chain control (DIN/DOUT/CLK/LE\), TQFP-48 package thermal performance (θJA = 68°C/W), off-isolation (-66dB @ 5MHz), and absence of external HV supply requirements.

Technical Context

The MP4816GFP integrates a 16-bit serial shift register followed by a parallel 16-bit latch to control individual SPST switches. Each channel features dedicated SWin (HV input) and SWout (transducer output) pins with non-interchangeable roles, enabling bidirectional signal routing for pulse-echo ultrasound operation.

Its patented level-shifting architecture eliminates need for ±HV supplies: internal translators convert 3.3–5.5V logic to drive ±90V analog paths using only VLL (2.7–5.5V) and VDD (9–10V). Switch timing is characterized with 2.0µs turn-on/off, 80MHz max clock, and 3ns data setup/hold.

Key Specifications

Pinout & Package

TQFP-48 (7mm × 7mm) package with exposed thermal pad; RoHS-compliant, lead-free, halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4800EUI+, MP4816GFP eliminates HV supply complexity and reduces on-resistance by 50%; versus ADG5412BRUZ, it delivers 4× channel density, 2.25× higher voltage rating, and integrated serial cascade-making it uniquely suited for scalable, probe-integrated ultrasound architectures.

Availability

MP4816GFP is available at Aetrix Electronics and suitable for medical ultrasound consoles, portable probe assemblies, non-destructive testing equipment, and high-density ultrasonic array systems requiring stable component supply, long-lifecycle support, and traceable sourcing.

Supply support for MP4816GFP 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP4816GFP belongs to MPS's high-voltage analog switch product line, engineered specifically for medical and industrial ultrasound systems requiring robust, supply-efficient, and daisy-chainable channel multiplexing without external HV rails.

FAQ

What are the absolute maximum voltage ratings for SWin and SWout pins?

The MP4816GFP supports pulsed analog voltages up to ±105V (absolute maximum) on SWin/SWout pins, with recommended operating range of 0V to ±90V. Exceeding ±105V risks permanent damage per JEDEC-rated absolute maximum limits; continuous operation above ±90V degrades reliability and is not guaranteed.

Can SWin and SWout pins be interchanged in the circuit layout?

No - SWin and SWout pins are functionally asymmetric and not interchangeable. SWin must connect to the HV pulser output and be held near ground before pulse initiation; SWout connects directly to the PZT transducer. Swapping them violates internal level-shifter biasing and causes functional failure or device damage.

How does the daisy-chain interface handle timing skew across multiple MP4816GFP devices?

Timing skew is minimized by synchronous clock distribution: all devices share the same Clk signal, and DOUT-to-DIN propagation delay is specified at 4–8ns (typical). With 80MHz clock and proper PCB length matching, full 192-channel update remains deterministic within ±2ns per stage, enabling sub-microsecond system-level reconfiguration.

Is thermal derating required when operating at maximum junction temperature (125°C)?

Yes - at TJ = 125°C, power dissipation must be limited to ≤1.08W (calculated via PD = (TJ(MAX) − TA)/θJA with TA = 25°C and θJA = 68°C/W). The device's 1.47W rated PD applies only at TA = 25°C; derating curves in the datasheet show linear reduction to zero at TJ = 150°C.

Does the MP4816GFP support DC-coupled signal paths?

Yes - the switch passes DC and low-frequency signals (including static bias) when ON, with ±75mV max DC offset (VDC-ON/VDC-OFF). This enables calibration signal injection and low-frequency transducer characterization without AC coupling capacitors, preserving signal integrity in precision ultrasound front-ends.

What is the purpose of the NC pins, and can they be grounded for thermal improvement?

NC pins (1,2,16,24,35,36) have no internal connection and must remain unconnected. Grounding them introduces parasitic capacitance, risk of solder bridging to adjacent traces, and potential thermal stress due to mismatched CTE - all violating MPS's validated layout guidelines and voiding reliability guarantees.

How does the clear (Clr) function interact with ongoing serial data loading?

Clr asynchronously resets only the 16-bit latch (setting all switches OFF) without affecting the 16-bit shift register contents. Data continues shifting into the register during Clr assertion, allowing immediate re-latching of new states upon Clr release - enabling glitch-free emergency shutdown while preserving next-state configuration.