DG458DJ

Overview

The DG458DJ is a fault-protected single-ended 8-channel analog multiplexer manufactured by Vishay Siliconix. It operates within a temperature range of -40 °C to +85 °C and utilizes a 16-pin Plastic DIP package. The device supports dual power supplies ranging from ±4.5 V to ±18 V, with an analog signal range of ±10 V. Key electrical parameters include a maximum on-resistance of 180 Ω at ±5 V supplies and 1.5 kΩ at ±15 V supplies. Dynamic characteristics feature a transition time of up to 500 ns, enable turn-on/off times of 500 ns, and settling times of 0.5 µs to 0.1%. Off-isolation reaches 90 dB at 100 kHz.

Feature Summary

• Incorporates series n-p-n MOSFET structure for fault and overvoltage protection up to ±35 V.
• Ensures all channels turn off automatically when power is removed.
• Features break-before-make switching to prevent adjacent channel crosstalk.
• Compatible with TTL and CMOS logic input thresholds.

Applications

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

Procurement Notes

Verify the specific suffix 'DJ' confirms the -40 °C to +85 °C operating temperature range and 16-pin Plastic DIP packaging. Confirm RoHS compliance status if required, as standard versions may differ from the -E3 variant. Validate that the application environment does not exceed the absolute maximum ratings for continuous current or storage temperature limits defined in the datasheet.

Selection Notes

Select this component for applications requiring high ruggedness against overvoltages and power loss conditions. Ensure the supply voltage remains within the ±4.5 V to ±18 V operational range. Consider the 180 Ω to 1.5 kΩ on-resistance variation based on the specific supply voltage used. Verify that the 200 ns to 500 ns transition time meets the system's speed requirements.

Part Context

The DG458DJ belongs to the DG458/DG459 family of fault-protected analog multiplexers. It serves as an improved pin-compatible replacement for legacy devices such as the HI-508A/509A and MAX358/359. The device is built on a high-voltage junction-isolated silicon-gate CMOS process, distinguishing it from standard parallel MOS switches.

Replacement Considerations

Publicly confirmed pin-compatible replacements include the HI-508A, HI-509A, MAX358, and MAX359. Verify functional equivalence regarding fault protection levels and on-resistance specifications before substitution.

FAQ

How does the DG458DJ protect against overvoltages?

It uses a series n-p-n MOSFET structure that isolates the internal circuitry, allowing it to withstand continuous overvoltage inputs up to ±35 V even during power loss.

What is the behavior of the channels during power failure?

All channels turn off automatically when power is removed, preventing loading on transducers and signal sources while limiting leakage currents to insignificant levels.

Does the device support differential signaling?

No, the DG458DJ is a single-ended 8-channel multiplexer. The DG459 model provides 4-channel differential functionality within the same family.