NMUX1237GWH

Overview

The NMUX1237 is a single-pole double-throw (SPDT) analog switch manufactured by Nexperia. It features two independent inputs/outputs (Y0, Y1) and one common input/output (Z), controlled by a digital select pin (S). The device operates on a wide supply voltage range from 1.08 V to 5.5 V with a typical ON resistance of 4 Ω at 5 V. It supports bidirectional signal paths and includes integrated overshoot suppression circuitry. The control logic maintains 1.8 V compatibility across the entire operating voltage range. The component provides Ioff protection for both digital and analog pins when unpowered.

Feature Summary

• Integrated multi-stage suppression circuit designed to minimize signal overshoot caused by charge injection and parasitic inductance during channel switching.
• Digital select input maintains 1.8 V logic compatible thresholds regardless of the analog supply voltage, eliminating the need for external voltage translation.
• Ioff protection circuitry isolates digital and analog pins from internal circuits when the supply voltage is zero, preventing back-powering and minimizing leakage current.
• Break-before-make switching architecture ensures isolation between channels during transitions.

Applications

• Programmable low-side current sink circuits requiring fast disconnect capabilities.
• Selectable operational amplifier configurations allowing switching between inverting and differential amplifier topologies.
• Systems combining low-voltage digital I/Os with mid-voltage analog signal monitoring.

Procurement Notes

Verify the specific ordering suffix 'GW' corresponds to the TSSOP6 plastic thin shrink small outline package (SOT363-2) with a temperature range of -40 °C to +125 °C. Confirm that the marking code 'M1' matches the physical device received. Ensure the application design accounts for the recommended operating conditions regarding switch current and voltage drops to avoid sinking GND current.

Selection Notes

Select this component when signal integrity is critical due to its dedicated overshoot suppression feature. It is suitable for designs where power sequencing flexibility is required, as it prevents back-powering of the supply rail when unpowered. Verify that the maximum ON resistance at the lowest expected supply voltage meets the system's resistive load requirements.

Part Context

The NMUX1237 belongs to the category of CMOS analog multiplexer/demultiplexer switches. It functions as a SPDT switch, distinct from higher-channel-count muxes or digital logic gates. The device utilizes standard CMOS technology optimized for low supply current and high isolation characteristics within a compact surface-mount package.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult manufacturer catalogs for alternative SPDT analog switches with similar voltage ranges and logic threshold specifications.

FAQ

How does the NMUX1237 handle power sequencing?

The device implements Ioff protection on both digital and analog pins. This isolates the internal circuits when VCC is 0 V, preventing biased inputs from back-powering the supply rail and allowing flexible power sequencing without external components.

What is the function of the integrated suppression circuit?

The integrated suppression circuit minimizes signal overshoot that typically occurs when switching between different channel inputs. It addresses issues related to charge injection, capacitive loads, and board parasitics to maintain signal integrity.

Can the NMUX1237 be controlled by 1.8 V logic if powered by 5 V?

Yes. The digital select input (S) supports 1.8 V logic thresholds independently of the operating voltage, ensuring compatibility with low-voltage digital controllers even when the analog supply is up to 5.5 V.