DG459DJ

Overview

The DG459DJ is a fault-protected analog multiplexer featuring four differential channels in a 16-pin plastic DIP package. It supports dual power supplies ranging from ±4.5 V to ±18 V, with absolute maximum ratings of ±20 V for inputs and ±35 V for overvoltage protection during both powered and unpowered states. The device exhibits a maximum on-resistance of 180 Ω at ±5 V supplies and up to 1.8 kΩ at ±15 V. Dynamic performance includes a transition time of 200 ns, an enable turn-on time of 140 ns, and off-isolation of 90 dB at 100 kHz. Operating temperature range spans -40 °C to +85 °C.

Feature Summary

• Incorporates series n-p-n MOSFET structures providing inherent fault and overvoltage protection for both the device and connected signal sources.
• Ensures all channels remain in the off state when power supplies are removed, preventing loading on transducers.
• Utilizes break-before-make switching logic to eliminate channel-to-channel interference and adjacent crosstalk.
• Features TTL and CMOS compatible digital control inputs for standard logic interface integration.

Applications

• Data acquisition systems
• Industrial process control systems
• Avionics test equipment
• High-reliability control systems
• Telemetry

Procurement Notes

Verify component authenticity through authorized Vishay distributors or certified suppliers. Request original manufacturer datasheets and traceability documentation to confirm compliance with RoHS directives and material specifications. Ensure storage conditions adhere to specified limits to maintain device integrity prior to assembly.

Selection Notes

Select this part for applications requiring high-voltage tolerance and robust fault protection. Verify that the required supply voltage falls within the ±4.5 V to ±18 V operational range. Confirm that the 180 Ω on-resistance meets system accuracy requirements. Ensure the 16-pin DIP package aligns with the target PCB layout constraints.

Part Context

This component belongs to the DG458/DG459 family of fault-protected analog multiplexers manufactured by Vishay Siliconix. It serves as an improved pin-compatible replacement for legacy HI-508A/509A and MAX358/359 devices. The DG459 specifically provides four differential channels, distinguishing it from the single-ended eight-channel DG458 variant.

Replacement Considerations

The DG459DJ is explicitly documented as a direct pin-compatible replacement for the Maxim MAX359 and Intersil HI-509A multiplexers. Designers migrating from these legacy parts can utilize this component without modifying the board footprint or logic connections.

FAQ

How does the DG459DJ protect against overvoltages when power is lost?

The device uses a series n-p-n MOSFET structure that acts as an open circuit under fault conditions. This allows it to withstand continuous overvoltage inputs up to ±35 V even when the power supplies (V+, V-) are completely off, protecting both the multiplexer and the driving sensors.

What is the maximum analog signal range for normal operation?

The guaranteed analog signal range is ±10 V. While the device can tolerate higher voltages due to its fault protection features, the on-resistance begins to rise significantly if the signal exceeds +13.5 V or drops below -12 V.

Does the device support single-supply operation?

No, the DG459DJ requires dual power supplies. The specification lists the continuous operating range as ±4.5 V to ±18 V. Single-supply operation is not supported for this specific model.