AD7503JQ

Overview

The AD7503JQ is a monolithic CMOS 8-channel analog multiplexer that switches one of eight inputs to a common output based on three binary address lines and an inverted enable input. It features TTL/DTL/CMOS direct interface compatibility. Key electrical parameters include a typical on-resistance (RON) of 170 Ω with a maximum of 300 Ω, switching times (tON/tOFF) of 0.8 µs typ, and supply current (IDD/ISS) of 500 µA max at low logic states. The device operates within an industrial temperature range of –25°C to +85°C.

Feature Summary

• Inverted enable logic for the AD7503 variant compared to the AD7501
• Direct interface compatibility with TTL, DTL, and CMOS logic families
• Monolithic CMOS construction ensuring low power dissipation

Applications

• Data acquisition systems requiring analog signal routing
• Process control applications involving multiple sensor inputs
• Industrial instrumentation utilizing single-ended or differential signals
• Sample-and-hold circuits in measurement equipment

Procurement Notes

Verify component status as obsolete before procurement planning. Confirm availability through authorized distributors or surplus channels. Ensure ESD precautions are maintained during handling due to CMOS sensitivity. Validate package type (CERDIP Q-16) against board layout requirements. Check for alternative lifecycle management options if long-term supply is required.

Selection Notes

Select the AD7503JQ when inverted enable logic is preferred over the standard AD7501 configuration. The JQ suffix denotes the industrial temperature grade (-25°C to +85°C), suitable for environments exceeding commercial limits. Compare on-resistance matching and leakage currents against system accuracy requirements. Consider the AD7502 if dual 4-channel functionality is needed instead of a single 8-channel path.

Part Context

The AD7503 belongs to the AD7501/AD7502/AD7503 family of CMOS analog multiplexers manufactured by Analog Devices. This series provides versatile signal switching capabilities for various electronic applications. The AD7503 specifically distinguishes itself through its active-high enable logic, contrasting with the active-low enable of the AD7501. All variants share similar pinouts and electrical characteristics, facilitating design flexibility within the same package formats.

Replacement Considerations

No public confirmed substitutes are listed in the provided documentation. As the part is marked obsolete, engineering change orders may be necessary to adopt newer generation multiplexers with compatible pinouts and electrical specifications.