DG444DJ+

Overview

The DG444DJ+ is a quad, single-pole/single-throw (SPST) analog switch manufactured by Analog Devices Inc./Maxim Integrated. It features four normally closed switches in a 16-pin Plastic DIP package with an operating temperature range of -40°C to +85°C. The device supports single-supply operation from +10V to +30V or bipolar supplies from ±4.5V to ±20V. Key electrical specifications include a maximum on-resistance of 85Ω, an on-resistance match between channels of 4Ω max, and guaranteed on-resistance flatness of 9Ω max over the signal range. Charge injection is limited to 10pC max, while off-leakage current remains below 5nA at +85°C. Switching times are specified as less than 250ns for turn-on and less than 70ns for turn-off.

Feature Summary

• Improved on-resistance matching between channels ensures consistent signal path characteristics across all four switches.
• Guaranteed on-resistance flatness over the entire signal range maintains low distortion during operation.
• Low charge injection minimizes transient voltage spikes when switching signals.
• Enhanced off-leakage current performance provides better isolation at elevated temperatures.

Applications

• Sample-and-hold circuits
• Audio signal routing
• Test equipment

Procurement Notes

Verify that the ordering suffix 'DJ+' corresponds to the specific 16-pin PDIP package and the industrial temperature range of -40°C to +85°C. Confirm RoHS compliance status through official manufacturer documentation before finalizing procurement decisions.

Selection Notes

Select this component when a quad SPST configuration with normally closed logic is required. Ensure the application utilizes TTL/CMOS-compatible logic levels and operates within the specified single or bipolar supply voltage ranges. Verify that the 85Ω maximum on-resistance meets the system's signal integrity requirements.

Part Context

This part belongs to the DG444/DG445 family of improved analog switches. The DG444 variant specifically provides four normally closed switches, whereas the DG445 offers four normally open switches. Both share identical pinouts and core electrical characteristics, differing primarily in their default switch state.

Replacement Considerations

DG444CJ is a direct replacement but is restricted to the commercial temperature range of 0°C to +70°C. Other variants such as DG444DY offer the same electrical performance in a surface-mount narrow SOIC package instead of the through-hole DIP format.

FAQ

What is the difference between the DG444 and DG445?

The DG444 contains four normally closed switches, while the DG445 contains four normally open switches. They share the same pinout and electrical specifications.

How does the DG444 handle overvoltage conditions?

Signals on the Source (S) or Drain (D) pins exceeding V+ or V- are clamped by internal diodes. Proper power-supply sequencing is recommended to prevent damage.

Is the DG444 compatible with standard logic families?

Yes, the device features TTL/CMOS-logic compatibility. The VL pin must be connected to +5V for TTL compatibility or to V+ for CMOS logic level inputs.