ADG433BR vs ADG431BRZ

The ADG431BRZ is a quad single-pole single-throw (SPST) normally closed (NC) analog switch, while the ADG433BR is a quad single-pole single-throw (SPST) switch configured as two normally open (NO) and two normally closed (NC) switches. Both are members of the Analog Devices ADG431/ADG432/ADG433 family, fabricated on a complementary metal-oxide semiconductor (CMOS) process, and feature low on-resistance and fast switching. The primary distinction is the switch configuration: ADG431BRZ provides four NC switches, whereas ADG433BR provides a mixed NO/NC configuration.

No. Although both devices are offered in the same 16-lead SOIC (R) package, their pin functions differ because the switch configurations are different. The ADG431BRZ has four normally closed switches, while the ADG433BR has two normally open and two normally closed switches. The logic control inputs and switch terminal assignments are not identical, so a direct drop-in replacement is not possible without verifying pin functions and redesigning the circuit as required.

Both devices are specified with low on-resistance, typically around 35 Ω or less at room temperature, and fast switching times in the range of tens of nanoseconds (turn-on and turn-off times on the order of 100 ns or less, depending on supply voltage and load conditions). For exact guaranteed limits, refer to the respective Analog Devices datasheets, as the parameters are specified over the full operating temperature range and supply voltage conditions.

Both devices operate from dual supplies of ±4.5 V to ±20 V or a single supply of +4.5 V to +40 V, making them suitable for a wide range of signal switching applications. The digital control inputs are compatible with standard CMOS and TTL logic levels, allowing direct interfacing with common logic families.

These analog switches are commonly used in signal routing, data acquisition systems, sample-and-hold circuits, audio and video signal switching, communication systems, and battery-powered instrumentation. The ADG431BRZ (four NC switches) is suited to applications requiring normally closed signal paths, while the ADG433BR (mixed NO/NC) is useful where a combination of normally open and normally closed switching is needed in a single package.

Both the ADG431BRZ and ADG433BR are available in a 16-lead SOIC package (the "R" suffix in the part number denotes the SOIC package). The "Z" suffix on the ADG431BRZ indicates RoHS-compliant, lead-free construction. Designers should confirm the exact package and ordering code against the manufacturer's datasheet and product page before finalizing a bill of materials.

Both devices share the same CMOS process and similar electrical characteristics, including low on-resistance, low leakage current, and fast switching. However, because the switch configurations differ (four NC versus two NO plus two NC), parameters such as charge injection and off-isolation may vary slightly between the two parts. Always consult the individual datasheets for guaranteed specifications rather than assuming identical performance.