HV2621/R4X

Analog Switches, Multiplexers, Demultiplexers Overview

The HV2621/R4X is a 300V, low-charge injection, 16-channel high-voltage analog switch manufactured by Microchip Technology. It operates with a logic supply voltage (VDD) of 3V to 5.5V and supports differential supply voltages (VPP-VNN) up to 300V. The device features a serial data shift register with latches for simultaneous state changes. Key electrical parameters include a typical on-resistance of 26Ω at VPP=+60V/VNN=-240V, off-isolation of -60dB at 5MHz, and a maximum clock frequency of 33MHz. It utilizes a 64-lead Very Thin Plastic Quad Flat, No Lead Package (QFN) measuring 9x9mm.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Integrates 16 independent SPST analog switches capable of handling high-voltage signals controlled by low-voltage CMOS logic inputs.
• Features a cascadable serial data register with latches allowing simultaneous switching of all channels via a latch enable signal.
• Designed with very low quiescent current consumption and excellent noise immunity suitable for precision applications.
• Utilizes HVCMOS technology to combine high-voltage bilateral DMOS switches with low-power CMOS logic.

Analog Switches, Multiplexers, Demultiplexers Applications

• Medical Ultrasound Imaging
• Nondestructive Testing (NDT) Metal Flaw Detection
• Multi-Layer Printed Circuit Board (PCB) Tester
• Piezoelectric Transducer Drivers
• Inkjet Printer Head

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific ordering suffix R4X corresponds to the 64-lead QFN package configuration. Confirm that the application does not require integrated bleed resistors, as the HV2621 variant lacks them compared to the HV2721/HV2722 models. Ensure power supply sequencing adheres to the recommended VDD, VPP, then VNN order to prevent device damage during startup.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select the HV2621 when bleed resistors are unnecessary or external resistance is preferred. Choose this component if the design requires a 300V rating with 16 channels in a compact QFN footprint. Verify that the required analog signal range fits within the VPP and VNN limits, typically allowing ±135V swing with ±150V supplies. Consider the HV2721 if integrated bleed resistors on both sides are needed for capacitive loads.

Analog Switches, Multiplexers, Demultiplexers Part Context

The HV2621 belongs to the HV2621/HV2721/HV2722 family of high-voltage analog switches. It is functionally similar to the HV2601 but offers a larger signal range. The primary distinction within the family is the presence of bleed resistors: the HV2621 has none, the HV2721 has them on both sides, and the HV2722 has them on one side only. All variants share the same pinout and control interface.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

The HV2601 is a related part number within the same family offering similar functionality but with a smaller signal range. If bleed resistors are required for the application, consider the HV2721 (both sides) or HV2722 (one side) as direct functional alternatives with identical packaging and control logic.

Analog Switches, Multiplexers, Demultiplexers FAQ

Does the HV2621 have integrated bleed resistors?

No, the HV2621 does not have integrated bleed resistors. This feature is available in the HV2721 (both sides) and HV2722 (one side) variants of the family.

What is the maximum clock frequency for the HV2621?

The maximum data shift clock frequency is 33 MHz when operating with a 5.0V logic supply (VDD). At 3.3V, the maximum frequency is 16 MHz.

How are the switch states updated simultaneously?

Switch states are updated simultaneously by keeping the Latch Enable (LE) input high while shifting 16 bits of data into the shift register. A subsequent negative pulse on the LE input transfers the data from the shift registers to the latches, changing all switch states at once.