STMicroelectronics STHV64SW

Overview

STHV64SW from STMicroelectronics is a 64-channel high-voltage analog switch IC designed for ultrasound transmit beamforming. It delivers ±100 V, -200 to 0 V, or 0 to 200 V output ranges, supports 20 MHz serial shift clock, provides ±3 A peak output current per channel, and integrates 42 kΩ bleed resistors and thermal/undervoltage protection-used in medical ultrasound transducer arrays.

For engineers reviewing the STHV64SW datasheet, STHV64SW pinout, STHV64SW application, or STHV64SW equivalent, key selection criteria include its rail-to-rail input capability, 40 V/ns slew rate, low on-resistance, channel-to-channel crosstalk performance, and cascaded serial interface architecture for scalable multi-chip configurations.

Technical Context

The STHV64SW implements a self-biased high-voltage gate driver architecture with integrated N-channel MOSFETs per channel, enabling fast switching across three selectable voltage ranges without external biasing. Its serial interface uses a 20 MHz shift clock with latched cascading registers to support synchronized control of all 64 switches.

Each channel includes a dedicated 42 kΩ bleed resistor, thermal sensing circuitry, and undervoltage lockout-ensuring safe discharge and fault resilience during high-frequency pulsing. The device operates from a single +3.3 V supply while delivering up to ±3 A peak current into capacitive piezoelectric loads.

Key Specifications

Pinout & Package

STHV64SW is housed in a 196-pin BGA package (12 mm × 12 mm, 0.8 mm pitch) with thermal pad exposed on underside for enhanced heat dissipation in high-duty-cycle ultrasound operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TX7336 and ADG1414BCPZ, STHV64SW uniquely integrates high-voltage drivers, thermal protection, serial scalability, and per-channel bleed resistors-making it the only solution qualified for full-array medical ultrasound transmit beamforming at ±100 V with ±3 A capability.

Availability

STHV64SW is available at Aetrix Electronics and suitable for medical imaging systems, industrial NDT equipment, piezoelectric actuator controllers, and high-voltage test instrumentation requiring stable component supply and long-term lifecycle support.

Supply support for STHV64SW 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and medical markets.

The STHV64SW belongs to ST's high-voltage analog switch product line, engineered specifically for precision ultrasound transmit beamforming and high-fidelity piezoelectric actuation in safety-critical medical and industrial systems.

FAQ

What voltage ranges does the STHV64SW support, and how are they selected?

The STHV64SW supports three output voltage ranges: ±100 V, 0–200 V, and −200–0 V. Selection is made externally via configuration of the VHV supply rail and associated bias networks-no internal register bits or digital commands are required. Each range maintains ±3 A peak current capability and identical switching performance.

Does the STHV64SW require external gate drive components or bootstrap circuits?

No. The STHV64SW integrates self-biased high-voltage gate drivers for all 64 N-channel MOSFETs. It operates from a single +3.3 V supply and eliminates external charge pumps, bootstrap diodes, or level shifters-reducing bill-of-materials and layout complexity in compact ultrasound modules.

How is thermal protection implemented, and what happens during overtemperature events?

Thermal protection uses an on-die temperature sensor that disables all 64 switches when junction temperature exceeds the safe threshold (typically ~150 °C). Output drivers enter high-impedance state, and the device remains latched off until temperature falls below hysteresis level-preventing thermal runaway during extended burst-mode operation.

Can multiple STHV64SW devices be synchronized for larger channel counts?

Yes. The serial interface supports daisy-chained configuration: SDI of the next device connects to SDO of the prior one, sharing SCLK and LE. A single 20 MHz clock and latch pulse updates all cascaded devices simultaneously-enabling coherent control of 128, 192, or more channels with deterministic timing alignment.