Monolithic Power Systems Inc. MP4816AGFP

Overview

MP4816AGFP from Monolithic Power Systems is a 16-channel, high-voltage SPST analog switch with integrated output bleed resistors, designed for medical ultrasound transmit/receive multiplexing. It supports ±90V analog signal switching, delivers ±2.0A peak current per channel, features 12.5Ω typical on-resistance, and operates from dual low-voltage supplies (3.3V logic + 10V translator). It enables compact, safe transducer array interfacing in portable ultrasound consoles and probe heads.

For engineers reviewing the MP4816AGFP datasheet, MP4816AGFP pinout, MP4816AGFP application, or MP4816AGFP equivalent, key selection criteria include its ±90V blocking/passing capability, 16-bit serial daisy-chain interface, TQFP-48 package thermal performance (θJA = 68°C/W), integrated bleed resistor functionality, and absence of external high-voltage supply requirements.

Technical Context

The MP4816AGFP implements a two-stage digital control architecture: a 16-bit serial shift register followed by a parallel 16-bit latch, enabling single-line daisy-chaining of multiple devices. Logic-level inputs (DIN, Clk, LE\, Clr) operate at VLL (2.7–5.5V), while analog switching is translated via VDD (9–10V) to handle ±90V signals without external HV rails.

Each of the 16 independent SPST channels includes dedicated SWin (high-voltage input) and SWout (transducer-connected output) pins, with RGND providing a dedicated ground return path for integrated bleed resistors (20–50kΩ). Off-isolation reaches –66dB at 5MHz, and switch turn-on/off time is 2.0µs with <18pC charge injection.

Key Specifications

Pinout & Package

TQFP-48 (7mm × 7mm) package with exposed thermal pad; θJA = 68°C/W, θJC = 15°C/W on 4-layer PCB; 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 MAX4820ETJ+ and ADG5412BRUZ, MP4816AGFP uniquely combines ±90V operation, integrated bleed resistors, 16-channel density, and daisy-chain scalability-making it the only solution qualified for clinical ultrasound probe-head integration and high-fidelity beamforming.

Availability

MP4816AGFP is available at Aetrix Electronics and suitable for medical ultrasound imaging systems, non-destructive testing equipment, and portable diagnostic device development requiring stable component supply, long-lifecycle assurance, and traceable sourcing.

Supply support for MP4816AGFP 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 distribution.

The MP4816AGFP belongs to MPS's high-voltage analog switch product line, engineered specifically for medical ultrasound and NDT systems requiring safe, compact, and supply-efficient transducer multiplexing without external HV infrastructure.

FAQ

What are the absolute maximum voltage ratings for MP4816AGFP analog pins?

The MP4816AGFP supports ±105V pulsed analog voltage on SWin/SWout pins per Absolute Maximum Ratings. Continuous operation is specified up to ±90V. Exceeding ±105V risks permanent damage, and operation above ±90V voids guaranteed performance including RON, isolation, and charge injection specs.

Does MP4816AGFP require external high-voltage supplies?

No. MP4816AGFP operates from only two low-voltage supplies: VLL (2.7–5.5V) for logic and VDD (9–10V) for internal level translation. Its patented architecture eliminates need for ±100V rails, HV bypass caps, or isolated DC/DC converters - reducing system complexity and safety certification burden.

How does the integrated bleed resistor function, and what is its value?

The MP4816AGFP integrates a 20–50kΩ bleed resistor between each SWout pin and RGND. During receive mode, it discharges residual PZT capacitance after transmit, suppressing acoustic ring-down and improving near-field image clarity. RGND must be connected to system ground via low-inductance path for effective operation.

Can multiple MP4816AGFP devices be cascaded, and what is the maximum daisy-chain length?

Yes - DOUT of one device connects to DIN of the next, enabling seamless daisy-chaining. With an 80MHz clock, 12 devices (192 channels) update in 2.4µs using only four control lines. Longer chains increase propagation delay but remain functional; timing margins must be verified per chain length using tSU/tH specs.

What is the thermal performance of MP4816AGFP in its TQFP-48 package?

In a standard 4-layer JEDEC PCB per JESD51-7, MP4816AGFP has θJA = 68°C/W and θJC = 15°C/W. At 1.47W max continuous dissipation (TA = 25°C), junction temperature reaches ~125°C - within rated TJ(max) = 150°C. For probe-head use, thermal vias under the exposed pad are strongly recommended.

Is MP4816AGFP compatible with 3.3V logic interfaces?

Yes. VLL accepts 2.7–5.5V, so 3.3V CMOS logic (VIH ≥ 2.4V, VIL ≤ 0.99V) fully satisfies input thresholds. IIL/IIH remain within ±1.0µA across voltage range, ensuring low drive burden on microcontrollers or FPGAs - no level-shifting required for 3.3V systems.

What failure modes occur if RGND is left unconnected?

Leaving RGND floating disables the integrated bleed resistors, causing residual charge to persist on SWout pins after transmit. This leads to acoustic ring-down, degraded axial resolution, and potential PZT depolarization over time. RGND must be connected to system ground with low-impedance path - not shared with noisy digital GND.