NMUX1308BQX

Overview

The NMUX1308BQX is a general-purpose, CMOS, bi-directional, 8-channel analog switch manufactured by Nexperia USA Inc. It operates within a supply voltage range of 1.5 V to 5.5 V and features SP8T-Z functionality with rail-to-rail operation on analog signal pins. The device integrates injection current control circuitry to isolate overvoltage spikes on disconnected pins, preserving measurement accuracy without external clamping components. Digital control inputs support 1.8 V logic thresholds across the full operating voltage range and are 5.5 V tolerant. The component includes Ioff protection circuitry for both digital and analog pins, ensuring high impedance and preventing back-powering when VCC is unpowered. It is housed in a DHVQFN16 package (SOT763-1) with dimensions of 2.5 mm x 3.5 mm x 0.85 mm.

Feature Summary

• Integrates injection current control circuitry to divert positive and negative injection currents through bypass FETs, minimizing supply voltage shifts and maintaining ON resistance stability during overvoltage events.
• Features 1.8 V compatible digital logic thresholds across the entire 1.5 V to 5.5 V operating range, eliminating the need for voltage translation devices when interfacing with low-voltage GPIOs.
• Provides comprehensive Ioff protection on digital and analog pins, isolating internal circuits from biased inputs when the supply is unpowered to prevent back-powering and minimize leakage current.
• Pin-compatible with industry standard 4051 and 4851 analog switch products, facilitating direct upgrades or replacements in existing designs.

Applications

• Analog or digital multiplexing and demultiplexing
• System monitoring and diagnostics
• Enterprise computing
• Appliances

Procurement Notes

Verify that the ordering suffix 'X' corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm that the DHVQFN16 package variant aligns with the thermal management and footprint constraints of the target PCB design. Ensure that the specified temperature range of -40 °C to +125 °C meets the environmental requirements of the final application environment.

Selection Notes

Select this component when designing systems requiring bi-directional signal routing with integrated overvoltage protection. The inclusion of injection current control reduces the need for external protective components, simplifying the bill of materials. Verify that the 1.8 V logic compatibility matches the microcontroller or FPGA output levels used in the control interface. Consider the thermal dissipation characteristics of the DHVQFN16 package if operating near maximum current limits.

Part Context

The NMUX1308 belongs to the NMUX130x family of analog switches from Nexperia, which also includes the NMUX1309 dual 4-channel variant. This family is designed as a drop-in replacement for legacy 4051 and 4851 devices while offering enhanced features such as injection current control and broader logic compatibility. The BQ suffix indicates the DHVQFN16 package type, distinguishing it from the PW suffix used for the TSSOP16 package.

Replacement Considerations

The NMUX1308BQX is pin-compatible with industry standard 4051 and 4851 analog switch products. Designers replacing legacy parts should verify that the new injection current control and Ioff protection features do not conflict with existing circuit behaviors, particularly regarding power sequencing and input biasing conditions.