MAX4509CPE+

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX4509CPE+ is a dual 4-to-1 fault-protected multiplexer manufactured by Analog Devices Inc. under the Maxim Integrated brand, housed in a 16-pin Plastic DIP package. It operates with dual supplies of ±4.5V to ±20V or a single supply of +9V to +36V. The device features ±40V overvoltage protection when powered off and ±25V protection when powered on. Key electrical parameters include a maximum on-resistance of 400 Ω, an on-resistance match between channels of 15 Ω max, and a fault output clamp turn-on delay of 20 ns. Logic inputs are TTL/CMOS compatible.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Provides rail-to-rail signal handling capability with overvoltage clamping at 150mV beyond the rails.
• Features fault-protected analog inputs that remain high impedance during fault conditions regardless of switch state.
• Ensures all channels are turned off automatically when power is removed without requiring specific power-supply sequencing.

Analog Switches, Multiplexers, Demultiplexers Applications

• Data-Acquisition Systems
• Industrial and Process Control
• Avionics
• Signal Routing
• Redundant/Backup Systems

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the component status as the provided source material indicates the product line may be discontinued. Confirm the lead-free designation associated with the plus suffix against current manufacturer documentation. Ensure the 16-pin PDIP package code matches the required board layout specifications for the target application.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component for applications requiring high-voltage fault protection on analog inputs. Verify that the single-supply voltage range of +9V to +36V or the dual-supply range of ±4.5V to ±20V aligns with the system power architecture. Ensure the logic thresholds meet the requirements for both TTL and CMOS compatibility if using a +12V single supply or ±15V dual supply.

Analog Switches, Multiplexers, Demultiplexers Part Context

The MAX4509CPE+ belongs to the MAX4508/MAX4509 family of fault-protected multiplexers. It serves as the dual-channel variant (dual 4-to-1) compared to the single-channel MAX4508 (single 8-to-1). Both parts are pin-compatible with industry-standard DG508/DG509 devices, facilitating direct replacement in existing designs.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

The MAX4509CPE+ is pin-compatible with the DG509. Designers should verify that the replacement device meets the specific fault protection voltage ratings and on-resistance requirements of the original design before substitution.